Agilent Technologies Portable Generator 75000 Series C User Manual

Agilent 75000 SERIES C

Agilent E1445A

Arbitrary Function Generator

Service Manual

Serial Numbers

This manual applies directly to instruments with serial numbers

prefixed with 3144A.

Manual Part Number: E1445-90011

Printed: November 2005 Edition 2

Printed in U.S.A. E1105

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Contents

Chapter 1 - General Information

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Inspection/Shipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Shipping Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

AFG Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

AFG Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

AFG Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

AFG Serial Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Recommended Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Chapter 2 - Verification Tests

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Test Conditions/Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Performance Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Verification Test Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Command Coupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Functional Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Ref In/Marker Out Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Start Arm In Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Start Arm In Test (cont’d) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Gate In Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Output Relay Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Operation Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Performance Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Test 2-1: DC Zeros . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Test 2-2: DC Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Test 2-3: DC Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Test 2-4: AC Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Test 2-5: AC Flatness - 250 kHz Filter . . . . . . . . . . . . . . . . . . . . . . . . 49

Test 2-6: AC Flatness - 10 MHz Filter . . . . . . . . . . . . . . . . . . . . . . . . 52

Test 2-7: Frequency Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Test 2-8: Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Test 2-9: Total Harmonic Distortion . . . . . . . . . . . . . . . . . . . . . . . . . 64

Test 2-10: Spurious/Non-Harmonic Distortion . . . . . . . . . . . . . . . . . . . . 69

Performance Test Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

AFG Test Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Measurement Uncertainty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Test Accuracy Ratio (TAR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Agilent E1445A Service Manual

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Chapter 3 - Adjustments

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Recommended Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Calibration Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Defeating Calibration Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

DC Adjustment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

AC Flatness Adjustment Procedure - 250 kHz Filter . . . . . . . . . . . . . . . . . . . 93

AC Flatness Adjustment Procedure - 10 MHz Filter . . . . . . . . . . . . . . . . . . . 94

Skew DAC Adjustment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Chapter 4 - Replaceable Parts

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Exchange Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Replaceable Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Chapter 5 - Service

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Service Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Troubleshooting Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Identifying the Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Testing the Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Removing BNC Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Repair/Maintenance Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

ESD Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Soldering Printed Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Post-Repair Safety Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Contents

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Certification

Agilent Technologies certifies that this product met its published specifications at the time of shipment from the factory. Agilent Tech-

nologies further certifies that its calibration measurements are traceable to the United States National Institute of Standards and Tech-

nology (formerly National Bureau of Standards), to the extent allowed by that organization’s calibration facility, and to the calibration

facilities of other International Standards Organization members.

Warranty

This Agilent Technologies product is warranted against defects in materials and workmanship for a period of three years from date of

shipment. Duration and conditions of warranty for this product may be superseded when the product is integrated into (becomes a part

of) other Agilent products. During the warranty period, Agilent Technologies will, at its option, either repair or replace products which

prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by Agilent Technologies. Buyer shall pre-

pay shipping charges to Agilent and Agilent shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all

shipping charges, duties, and taxes for products returned to Agilent from another country.

Agilent warrants that its software and firmware designated by Agilent for use with a product will execute its programming instructions

when properly installed on that product. Agilent does not warrant that the operation of the product, or software, or firmware will be un-

interrupted or error free.

Limitation Of Warranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer, Buyer-supplied prod-

ucts or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or im-

proper site preparation or maintenance.

The design and implementation of any circuit on this product is the sole responsibility of the Buyer. Agilent does not warrant the

Buyer’s circuitry or malfunctions of Agilent products that result from the Buyer’s circuitry. In addition, Agilent does not warrant any

damage that occurs as a result of the Buyer’s circuit or any defects that result from Buyer-supplied products.

NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. Agilent SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES

OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Exclusive Remedies

THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES. Agilent SHALL NOT BE LIABLE

FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CON-

TRACT, TORT, OR ANY OTHER LEGAL THEORY.

Notice

The information contained in this document is subject to change without notice. Agilent Technologies MAKES NO WARRANTY OF

ANY KIND WITH REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Agilent shall not be liable for errors contained herein or

for incidental or consequential damages in connection with the furnishing, performance or use of this material. This document contains

proprietary information which is protected by copyright. All rights are reserved. No part of this document may be photocopied, repro-

duced, or translated to another language without the prior written consent of Agilent Technologies, Inc. Agilent assumes no responsibil-

ity for the use or reliability of its software on equipment that is not furnished by Agilent.

U.S. Government Restricted Rights

The Software and Documentation have been developed entirely at private expense. They are delivered and licensed as "commercial

computer software" as defined in DFARS 252.227- 7013 (Oct 1988), DFARS 252.211-7015 (May 1991) or DFARS 252.227-7014 (Jun

1995), as a "commercial item" as defined in FAR 2.101(a), or as "Restricted computer software" as defined in FAR 52.227-19 (Jun

1987)(or any equivalent agency regulation or contract clause), whichever is applicable. You have only those rights provided for such

Software and Documentation by the applicable FAR or DFARS clause or the Agilent standard software agreement for the product in-

volved.

Agilent E1445A Arbitrary Function Generator Service Manual

Edition 2

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Printing History

The Printing History shown below lists all Editions and Updates of this manual and the printing date(s). The first printing of the man-

ual is Edition 1. The Edition number increments by 1 whenever the manual is revised. Updates, which are issued between Editions,

contain replacement pages to correct the current Edition of the manual. Updates are numbered sequentially starting with Update 1.

When a new Edition is created, it contains all the Update information for the previous Edition. Each new Edition or Update also in-

cludes a revised copy of this printing history page. Many product updates or revisions do not require manual changes and, conversely,

manual corrections may be done without accompanying product changes. Therefore, do not expect a one-to-one correspondence be-

tween product updates and manual updates.

Edition 1 (Part Number E1445-90010). . . . . . . . . . . . . . . . . . . . September 1992

Edition 2 (Part Number E1445-90011). . . . . . . . . . . . . . . . . . . . September 1996

Safety Symbols

Instruction manual symbol affixed to prod-

uct. Indicates that the user must refer to the

manual for specific WARNING or CAU-

TION information to avoid personal injury

or damage to the product.

Alternating current (AC).

Direct current (DC).

Indicates hazardous voltages.

Indicates the field wiring terminal that must

be connected to earth ground before operat-

ing the equipment—protects against electri-

cal shock in case of fault.

Calls attention to a procedure, practice, or

condition that could cause bodily injury or

death.

WARNING

CAUTION

Calls attention to a procedure, practice, or con-

dition that could possibly cause damage to

equipment or permanent loss of data.

Frame or chassis ground terminal—typi-

cally connects to the equipment’s metal

frame.

WARNINGS

The following general safety precautions must be observed during all phases of operation, service, and repair of this product.

Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design,

manufacture, and intended use of the product. Agilent Technologies assumes no liability for the customer’s failure to comply

with these requirements.

Ground the equipment: For Safety Class 1 equipment (equipment having a protective earth terminal), an uninterruptible safety earth

ground must be provided from the mains power source to the product input wiring terminals or supplied power cable.

DO NOT operate the product in an explosive atmosphere or in the presence of flammable gases or fumes.

For continued protection against fire, replace the line fuse(s) only with fuse(s) of the same voltage and current rating and type.

DO NOT use repaired fuses or short-circuited fuse holders.

Keep away from live circuits: Operating personnel must not remove equipment covers or shields. Procedures involving the removal

of covers or shields are for use by service-trained personnel only. Under certain conditions, dangerous voltages may exist even with the

equipment switched off. To avoid dangerous electrical shock, DO NOT perform procedures involving cover or shield removal unless

you are qualified to do so.

DO NOT operate damaged equipment: Whenever it is possible that the safety protection features built into this product have been im-

paired, either through physical damage, excessive moisture, or any other reason, REMOVE POWER and do not use the product until

safe operation can be verified by service-trained personnel. If necessary, return the product to an Agilent Technologies Sales and Serv-

ice Office for service and repair to ensure that safety features are maintained.

DO NOT service or adjust alone: Do not attempt internal service or adjustment unless another person, capable of rendering first aid

and resuscitation, is present.

DO NOT substitute parts or modify equipment: Because of the danger of introducing additional hazards, do not install substitute

parts or perform any unauthorized modification to the product. Return the product to an Agilent Technologies Sales and Service Office

for service and repair to ensure that safety features are maintained.

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DECLARATION OF CONFORMITY

According to ISO/IEC Guide 22 and CEN/CENELEC EN 45014

Manufacturer’s Name:

Manufacturer’s Address:

Agilent Technologies, Incorporated

815 – 14^thSt. SW

Loveland, Colorado 80537

USA

Declares, that the product

Product Name:

Model Number:

Product Options:

Arbitrary Function Generator

E1445A

This declaration covers all options of the above product(s).

Conforms with the following European Directives:

The product herewith complies with the requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC

(including 93/68/EEC) and carries the CE Marking accordingly.

Conforms with the following product standards:

EMC

Standard

Limit

IEC 61326-1:1997+A1:1998 / EN 61326-1:1997+A1:1998

CISPR 11:1990 / EN 55011:1991

Group 1 Class A

IEC 61000-4-2:1995+A1:1998 / EN 61000-4-2:1995

IEC 61000-4-3:1995 / EN 61000-4-3:1995

IEC 61000-4-4:1995 / EN 61000-4-4:1995

IEC 61000-4-5:1995 / EN 61000-4-5:1995

IEC 61000-4-6:1996 / EN 61000-4-6:1996

IEC 61000-4-11:1994 / EN 61000-4-11:1994

4kV CD, 8kV AD

3 V/m, 80-1000 MHz

0.5kV signal lines, 1kV power lines

0.5 kV line-line, 1 kV line-ground

3V, 0.15-80 MHz I cycle, 100%

Dips: 30% 10ms; 60% 100ms

Interrupt > 95%@5000ms

Canada: ICES-001:1998

Australia/New Zealand: AS/NZS 2064.1

The product was tested in a typical configuration with Agilent Technologies test systems.

IEC 61010-1:1990+A1:1992+A2:1995 / EN 61010-1:1993+A2:1995

Canada: CSA C22.2 No. 1010.1:1992

UL 3111-1: 1994

Safety

1 June 2001

Date

Ray Corson

Product Regulations Program Manager

For further information, please contact your local Agilent Technologies sales office, agent or distributor.

Authorized EU-representative: Agilent Technologies Deutschland GmbH, Herrenberger Strabe 130, D 71034 Böblingen, Germany

Revision: B.01

Issue Date: 1 June 2001

Document E1445A.DOC

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Notes

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Chapter 1

General Information

Introduction

This manual contains information required to test, troubleshoot, and repair

the Agilent E1445A C-Size VXI Arbitrary Function Generator (AFG). See

the Agilent E1445A User’s Manual for additional information. Figure 1-1

shows the Agilent E1445A. This chapter includes the following sections:

• Introduction

• Safety Considerations

• Inspection/Shipping

• Environment

• AFG Description

• Recommended Test Equipment

Figure 1-1. E1445A Arbitrary Function Generator

Agilent E1445A Service Manual

General Information 9

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Safety

Considerations

This product is a Safety Class I instrument that is provided with a protective

earth terminal when installed in the mainframe. The mainframe, AFG, and

all related documentation should be reviewed for familiarization with safety

markings and instructions before operation or service.

Refer to the WARNINGS page (page 4) in this manual for a summary of

safety information. Safety information for preventive maintenance, testing,

and service follows and is also found throughout this manual.

Warnings and This section contains WARNINGS which must be followed for your

protection and CAUTIONS which must be followed to avoid damage to the

equipment when performing instrument maintenance or repair.

Cautions

WARNING

SERVICE-TRAINED PERSONNEL ONLY. The information in this

manual is for service-trained personnel who are familiar with

electronic circuitry and are aware of the hazards involved. To

avoid personal injury or damage to the instrument, do not

perform procedures in this manual or do any servicing unless

you are qualified to do so.

CHECK MAINFRAME POWER SETTINGS. Before applying

power, verify that the mainframe setting matches the line

voltage and that the correct fuse is installed. An uninterruptible

safety earth ground must be provided from the main power

source to the supplied power cord set.

GROUNDING REQUIREMENTS. Interruption of the protective

(grounding) conductor (inside or outside the mainframe) or

disconnecting the protective earth terminal will cause a

potential shock hazard that could result in personal injury.

(Grounding one conductor of a two-conductor outlet is not

sufficient protection.)

IMPAIRED PROTECTION. Whenever it is likely that instrument

protection has been impaired, the mainframe must be made

inoperative and be secured against any unintended operation.

REMOVE POWER IF POSSIBLE. Some procedures in this

manual may be performed with power supplied to the

mainframe while protective covers are removed. Energy

available at many points may, if contacted, result in personal

injury. (If maintenance can be performed without power applied,

the power should be removed.)

10 General Information

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WARNING

USING AUTOTRANSFORMERS. If the mainframe is to be

energized via an autotransformer (for voltage reduction) make

sure the common terminal is connected to neutral (that is, the

grounded side of the main’s supply).

CAPACITOR VOLTAGES. Capacitors inside the mainframe may

remain charged even when the mainframe has been

disconnected from its source of supply.

USE PROPER FUSES. For continued protection against fire

hazard, replace the line fuses only with fuses of the same

current rating and type (such as normal blow, time delay, etc.).

Do not use repaired fuses or short-circuited fuseholders.

CAUTION

Static electricity is a major cause of component failure. To prevent

damage to the electrical components in the AFG, observe anti-static

techniques whenever working on the AFG.

Agilent E1445A Service Manual

General Information 11

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Inspection/

Shipping

This section describes initial (incoming) inspection and shipping guidelines

for the AFG.

Initial Use the steps in Figure 1-2 as guidelines to perform initial inspection of

the AFG.

Inspection

WARNING

To avoid possible hazardous electrical shock, do not perform

electrical tests if there are signs of shipping damage to the

shipping container or to the instrument.

Figure 1-2. Initial (Incoming) Inspection Guidelines

12 General Information

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Shipping Follow the steps in Figure 1-3 to return the AFG to an Agilent Technologies

Sales and Support Office or Service Center.

Guidelines

1. Prepare the module

• Remove user wiring from terminal block

• Attach tag to module that identifies:

•

Owner

Model Number/Serial Number

Service Required

• Place tagged device in approved anti-static bag

2. Package the module

• Place packaged module in shipping carton*

• Place 75 to 100 mm (3 to 4 inches) of

shock-absorbing material around the module

• Seal the shipping container securely

• Mark the shipping container FRAGILE

3. Ship the module to Agilent Technologies

• Place address label on shipping carton

• Send carton to Agilent Technologies

* We recommend that you use the same shipping materials as those used in factory packaging (available from

Agilent Technologies). For other (commercially-available) shipping materials, use a double-wall carton with

minimum 2.4 MPa (350 psi) test.

Figure 1-3. Packaging/Shipping Guidelines

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General Information 13

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Environment

The recommended operating environment for the Agilent E1445A

AFG is:

Environment

Temperature

0^oC to +55^oC

Humidity

Operating

<65% relative (0^oC to +40^oC)

Storage and

Shipment

-40^oC to +75^oC

AFG

Description

The Agilent E1445A Arbitrary Function Generator is a VXIbus C-size,

message-based instrument. The AFG can operate in a C-size VXIbus

mainframe using an Agilent E1405/E1406 Command Module and Standard

Commands for Programmable Instruments (SCPI).

The AFG has 13 bits of resolution (including sign). It uses a sequencer

architecture, with 256K points of Segment storage and 32K points of

Sequence storage. The AFG has two internal timebases, 40 MHz and

(approximately) 42.9 MHz.

AFG AFG specifications are listed in Appendix A of the Agilent E1445A User’s

Manual. These specifications are the performance standards or limits

Specifications

against which the instrument may be tested.

AFG Arbitrary Waveform Generation Software for HP 9000 Series 300

computers can be ordered as Option 005.

Options

AFG Figure 1-4 shows Agilent Technologies’ serial number structure. AFG’s

covered by this manual are identified by a serial number prefix listed on the

title page.

Serial Numbers

Agilent

Figure 1-4. Agilent Serial Numbers

14 General Information

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Recommended

Test Equipment

Table 1-1 lists the test equipment recommended for testing, adjusting, and

servicing the AFG. Essential requirements for each piece of test equipment

are described in the Requirements column.

Table 1-1. Recommended Test Equipment

Instrument

Requirements

Recommended

Model

Use*

Controller, GP-IB

GP-IB compatibility as defined by IEEE

Standard 488-1988 and the identical

ANSI Standard MC1.1: SH1, AH1, T2,

TE0, L2, LE0, SR0, RL0, PP0, DC0,

DT0, and C1, 2, 3, 4, 5.

HP 9000 Series 300

IBM Compatible PC

F,O,P,

A,T

with HP BASIC

Mainframe

Compatible with AFG

Agilent E1401B/T or

E1421B

F,O,P,

A,T

Command Module

10 MHz Clk Out

TTL compatible Trig Out

Agilent E1405B or

Agilent E1406A

F,O,P,

A,T

Digital Multimeter

Power Meter

Power Sensor

Counter

DCV, ACV, 4-wire ohms w/offset comp

Frequency Range: 400 kHz - 10.8 MHz

Frequency Range: 100 Hz - 45 MHz

Frequency Range: 100 kHz - 150 MHz

Agilent 3458A

Agilent 8902A

Agilent 11722A

Agilent 5334A/B

Agilent 8566B

Agilent 54111D

O,P,A

O,P

Spectrum Analyzer

Oscilloscope

O,P,A

General Purpose

Bandwidth: 20 MHz

Agilent 11048C

O,P,A

50 Ω feed-thru

termination

50 0.10 Ω

* F = Functional Verification, O = Operation Verification Tests, P = Performance Verification

Tests, A = Adjustments, T = Troubleshooting

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16 General Information

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Chapter 2

Verification Tests

Introduction

The three levels of test procedures described in this chapter are used to

verify that the Agilent E1445A:

• is fully functional (Functional Verification)

• meets selected testable specifications (Operation Verification)

• meets all testable specifications (Performance Verification)

WARNING

Do not perform any of the following verification tests unless

you are a qualified, service-trained technician and have read the

WARNINGS and CAUTIONS in Chapter 1.

Test Conditions/ See Table 1-1 for test equipment requirements. You should complete the

Performance Verification tests at least once a year. For heavy use or severe

operating environments, perform the tests more often.

Procedures

Before performing these tests, allow the AFG to warm up for at least one hour.

The temperature should be within 5 C of T (the temperature of the most

cal

recent calibration), and between 18 C and 28 C.

The verification tests assume that the person performing the tests

understands how to operate the mainframe, the AFG, and specified test

equipment. The test procedures do not specify equipment settings for test

equipment, except in general terms. It is assumed that a qualified,

service-trained technician will select and connect the cables, adapters, and

probes required for the test.

Performance The results of each Performance Verification test may be recorded in Table

2-11, Agilent E1445A Performance Test Record. This form can be copied.

Test Record

Verification Test Each verification test procedure includes an example program that performs

the test. All example programs assume the following configuration:

Examples

• Controller is an HP 9000 Series 200/300 computer

• Programming language is HP BASIC

• AFG address is 70910

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Command Coupling Many of the AFG SCPI commands are value-coupled. In order to prevent

"Settings Conflict" errors, coupled commands must be sent contiguously by

placing them in the same program line, or by suppressing the end-of-line

terminator. (For more information on command coupling and syntax, see

Chapter 1 of the Agilent E1445A User’s Manual). In HP BASIC, the

end-of-line terminator can be suppressed by linking the commands with a

semi-colon (;) and a colon (:), as illustrated below:

ROSC:SOUR INT1;

:TRIG:SOUR INT1

In the Example programs, these commands would appear as follows:

OUTPUT 70910;"ROSC:SOUR:INT1;";

OUTPUT 70910;":TRIG:SOUR:INT1"

Functional

Verification

The purpose of these tests is to verify that the AFG is functioning properly

and that all front panel inputs and outputs are working. No attempt is made

to verify that the AFG is meeting specifications. Functional Verification for

the AFG includes the following tests:

• Self-Test

• Ref In/Marker Out Test

• Start Arm In Test

• Gate In Test

• Output Relay Test

NOTE

For a quick functional check of the AFG, perform only the Self-Test.

An example program that performs all of the Functional Verification tests is

included at the end of this section. An Agilent E1405/E1406 Command

Module is required for this program.

NOTE

Some of the tests use the "TRIG OUT" port of the Command Module. This

port uses negative logic, i.e., the high voltage is a logical 0 and the low

voltage is a logical 1.

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Functional Verification: Self-Test

Description

The AFG self-test performs the following internal checks:

• internal interrupt lines

• waveform select RAM

• segment sequence RAM

• waveform segment RAM

• DDS/NCO operation

• sine wave generation

• arbitrary waveform generation

• marker generation

• waveform cycle and arm counters

• sweep timer

• frequency-shift keying

• stop trigger

• DC analog parameters (amplitude, offset, attenuators, filters,

calibration DACs)

Test Procedure

1. Remove any connections to the AFG front panel.

2. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

3. Execute the AFG self-test:

*TST?

Self-test command

4. Read the result. A "0" indicates that the test passed. A "1" indicates a

failure. Read the error queue using the SYST:ERR? command until

the error message is "No error".

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Functional Verification: Ref In/Marker Out Test

Description

The purpose of this test is to check the Ref/Sample In and Marker Out ports.

An external reference is connected to the Ref/Sample In port and sent to the

Marker Out port.

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set up equipment as shown in Figure 2-1:

Figure 2-1. Ref/Sample In Test Setup

3. Set up the AFG to output the external reference to the "Marker Out"

port:

ROSC:SOUR EXT

MARK:FEED "ROSC"

INIT:IMM

External ref oscillator

Marker source is ROSC

Initiate

4. Verify that the scope shows a 10 MHz squarewave.

20 Verification Tests

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Functional Verification: Start Arm In Test

Description

The purpose of this test is to check the Start Arm In port. The "TRIG OUT"

port of the Command Module is used to send a Start Arm signal to the AFG.

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set up equipment as shown in Figure 2-2:

Figure 2-2. Start Arm In Test Setup

3. Send the following commands to the Command Module to output 0 V

to the "Trig Out" port:

*RST

OUTP:EXT:STAT ON

OUTP:EXT:SOUR INT

OUTP:EXT:LEV 1

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Functional Verification: Start Arm In Test (cont’d)

Test Procedure

(cont’d)

4. Set up the AFG to output a 1 MHz sinewave, with an external Start

Arm source:

FREQ 1E6;

:VOLT 4VPP

ARM:LAY2:SOUR EXT

Set freq to 1 MHz

Set AFG amplitude

External Start Arm

source

INIT:IMM

Initiate

5. Verify that no signal appears on the scope. Send the following

command to the Command Module to provide a Start Arm signal to

the AFG:

OUTP:EXT:LEV 0

6. Verify that a 1 MHz sinewave appears on the scope.

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Functional Verification: Gate In Test

Description

The purpose of this test is to check the gating function. The "TRIG OUT"

port of the Command Module is used to gate the output.

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set up the equipment as shown in Figure 2-3.

Figure 2-3. Gate In Test Setup

3. Send the following commands to the Command Module to enable the

"Trig Out" port:

*RST

OUTP:EXT:STAT ON

OUTP:EXT:SOUR INT

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Functional Verification: Gate In Test (cont’d)

Test Procedure

(cont’d)

4. Set up the AFG to output a 1 MHz sinewave with an external gate

source:

TRIG:GATE:SOUR EXT;

:TRIG:GATE:STAT ON;

:FREQ 1E6;

:VOLT 4VPP

INIT:IMM

External gate source

Enable gate

Set freq to 1 MHz

Set AFG amplitude

Initiate

5. Send the following command to the Command Module to set the

level at the "Trig Out" port to 5 V. Verify that the scope shows a 1

MHz sinewave.

OUTP:EXT:LEV 0

6. Send the following command to the Command Module to set the

level at the "Trig Out" port to 0 V. Verify that the scope shows a DC

signal.

OUTP:EXT:LEV 1

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Functional Verification: Output Relay Test

Description

The purpose of this test is to check the output relay.

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set up equipment as shown in Figure 2-4:

Figure 2-4. Output Relay Test Setup

3. Set up the AFG to output a 1 MHz sinewave:

FREQ 1E6;

:VOLT 4VPP

INIT:IMM

Set freq to 1 MHz

Set AFG amplitude

Initiate

4. Verify that a 1 MHz sinewave appears on the scope.

5. Disable the Output relay:

OUTP OFF

6. Verify that no signal appears on the scope.

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Functional Verification

Example Program

This program performs the Functional Verification Tests for the AFG. An Agilent E1405/E1406 Command

Module is required for this test.

10! RE-STORE "FUNC_TEST"

20 COM @Afg,@Cmd_mod,INTEGER Done

40 !---------- Set up I/O paths ----------

50 ASSIGN @Afg TO 70910

60 ASSIGN @Cmd_mod TO 70900

80 !---------- Initialize AFG & Command Module ----------

90 Reset_afg

100 !

110 !Set up Command Module ’TRIG OUT’ port

120 OUTPUT @Cmd_mod;"*RST"

130 OUTPUT @Cmd_mod;"OUTP:EXT:STAT ON"

140 OUTPUT @Cmd_mod;"OUTP:EXT:SOUR INT"

150 !

160 !---------- Perform tests ----------

170 CLEAR SCREEN

180 PRINT "Agilent E1445A FUNCTIONAL VERIFICATION TESTS"

190 PRINT

200 !

210 !Oscilloscope settings

220 PRINT "Set scope to: 2 V/div, .02 usec/div"

230 PRINT

240 Wait_for_cont

250 !

260 CALL Self_test

270 CALL Ref_in

280 !

!Self-Test

!Ref In/Marker Out Test

290 !Oscilloscope settings

300 CLEAR SCREEN

310 PRINT "Set scope to: 2 V/div, .2 usec/div"

320 PRINT

330 Wait_for_cont

340 !

350 CALL Start_arm

360 CALL Gate_in

370 CALL Output_relay

380 !

!Start Arm In Test

!Gate In Test

!Output Relay Test

390 Quit: !

400 Reset_afg

410 CLEAR SCREEN

420 DISP "Functional Tests completed."

430 END

(Continued on next page)

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Functional Verification

Example Program (cont’d)

450 !---------- Subprograms ----------

460 SUB Reset_afg

470 COM @Afg,@Cmd_mod,INTEGER Done

480 OUTPUT @Afg;"*RST;*CLS"

490 WAIT 1

!Reset AFG and clear Status register

500 SUBEND

510 !

520 SUB Self_test

530 COM @Afg,@Cmd_mod,INTEGER Done

540 DIM Message$[255]

550

560 Reset_afg

570

580 CLEAR SCREEN

590 PRINT "SELF-TEST"

600 PRINT

610

620 !Test connections

630 PRINT "Remove any connections from the E1445A front panel."

640 PRINT "Press ’Continue’ to initiate Self-Test."

650 PRINT

660 Wait_for_cont

670

680 !Perform test

690 OUTPUT @Afg;"*TST?"

700 ENTER @Afg;Result

!Self-test command

!Get result

710

720 IF Result=0 THEN

730

PRINT "Self-test passed."

740 ELSE

750

760

770

780

790

800

810

PRINT "Self-test failed."

PRINT "The following error(s) occurred:"

REPEAT

OUTPUT @Afg;"SYST:ERR?"

ENTER @Afg;Message$

PRINT " "&Message$

!Check for errors

UNTIL POS(Message$,"No error")

820 END IF

830 Wait_for_cont

840 SUBEND

850 !

860 SUB Ref_in

870 COM @Afg,@Cmd_mod,INTEGER Done

880

(Continued on next page)

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Functional Verification

Example Program (cont’d)

890 Reset_afg

900

910 CLEAR SCREEN

920 PRINT "REF IN/MARKER OUT TEST"

930 PRINT

940

950 !Test connections

960 PRINT "Connect Scope to ’Marker Out’ on the E1445A."

970 PRINT "Connect Command Module ’Clk Out’ to ’Ref/Sample In’ on the E1445A."

980 PRINT

990 Wait_for_cont

1000

1010 !Perform test

1020 OUTPUT @Afg;"ROSC:SOUR EXT"

1030 OUTPUT @Afg;"MARK:FEED ""ROSC"""

1040 OUTPUT @Afg;"INIT:IMM"

!External ref osc source

!Marker source is ’ROSC’

!Initiate

1050

1060 PRINT "Verify that the scope shows a 10 MHz squarewave."

1070 Wait_for_cont

1080 SUBEND

1090 !

1100 SUB Start_arm

1110 COM @Afg,@Cmd_mod,INTEGER Done

1120

1130 Reset_afg

1140

1150 CLEAR SCREEN

1160 PRINT "START ARM TEST"

1170 PRINT

1180

1190 !Test connections

1200 PRINT "Connect Scope to the E1445A Output."

1210 PRINT "Connect Command Module ’Trig Out’ to ’Start Arm In’ on the E1445A."

1220 PRINT

1230 Wait_for_cont

1240

1250 !Set Command Module’s ’TRIG OUT’ to 0V (E1405 uses neg logic)

1260 OUTPUT @Cmd_mod;"OUTP:EXT:LEV 1"

1270

1280 !Perform test

1290 OUTPUT @Afg;"FREQ 1E6;";

1300 OUTPUT @Afg;":VOLT 4VPP"

1310 OUTPUT @Afg;"ARM:LAY2:SOUR EXT"

1320 OUTPUT @Afg;"INIT:IMM"

!Set freq to 1 MHz

!Set amplitude

!Start Arm source is EXT

!Initiate

1330

(Continued on next page)

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Functional Verification

Example Program (cont’d)

1340 PRINT "Verify that no signal appears on the scope."

1350 PRINT "Press ’Continue’ to send a START ARM."

1360 PRINT

1370 Wait_for_cont

1380

1390 !Set ’TRIG OUT’ to 5V

1400 OUTPUT @Cmd_mod;"OUTP:EXT:LEV 0"

1410

1420 PRINT "Verify that the scope shows a 1 MHz sinewave."

1430 Wait_for_cont

1440 SUBEND

1450 !

1460 SUB Gate_in

1470 COM @Afg,@Cmd_mod,INTEGER Done

1480

1490 Reset_afg

1500

1510 CLEAR SCREEN

1520 PRINT "GATE IN TEST"

1530 PRINT

1540

1550 !Test connections

1560 PRINT "Connect Scope to the E1445A Output."

1570 PRINT "Connect Command Module ’Trig Out’ to ’Stop Trig/FSK/Gate In’ on the E1445A."

1580 PRINT

1590 Wait_for_cont

1600

1610 !Perform test

1620 OUTPUT @Afg;"TRIG:GATE:SOUR EXT;";

1630 OUTPUT @Afg;":TRIG:GATE:STAT ON;";

1640 OUTPUT @Afg;":FREQ 1E6;";

1650 OUTPUT @Afg;":VOLT 4VPP"

1660 OUTPUT @Afg;"INIT:IMM"

!Gate source is EXT

!Enable gate

!Set freq to 1 MHz

!Set amplitude

!Initiate

1670

1680 PRINT "Verify that the signal displayed on the scope toggles between"

1690 PRINT "a 1 MHz sinewave and a DC signal at 1 second intervals."

1700

1710 ON KBD ALL CALL Key_press

1720 DISP "Press any key to continue"

1730

1740 Done=0

1750 !Send pulses to ’TRIG OUT’ BNC until a key is pressed

(Continued on next page)

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Functional Verification

Example Program (cont’d)

1760 REPEAT

1770

1780

1790

1800

OUTPUT @Cmd_mod;"OUTP:EXT:LEV 1"

WAIT 1

OUTPUT @Cmd_mod;"OUTP:EXT:LEV 0"

WAIT 1

1810 UNTIL Done

1820 OFF KBD

1830 SUBEND

1840 !

1850 SUB Output_relay

1860 COM @Afg,@Cmd_mod,INTEGER Done

1870

1880 Reset_afg

1890

1900 CLEAR SCREEN

1910 PRINT "OUTPUT RELAY TEST"

1920 PRINT

1930

1940 !Test connections

1950 PRINT "Connect Scope to the E1445A Output."

1960 PRINT

1970 Wait_for_cont

1980

1990 !Perform test

2000 OUTPUT @Afg;"FREQ 1E6;";

2010 OUTPUT @Afg;":VOLT 4VPP"

2020 OUTPUT @Afg;"INIT:IMM"

!Set freq to 1 MHz

!Set amplitude

!Initiate

2030

2040 PRINT "Verify that the scope shows a 1 MHz sinewave."

2050 PRINT "Press ’Continue’ to disable the E1445A output."

2060 PRINT

2070 Wait_for_cont

2080

2090 OUTPUT @Afg;"OUTP OFF"

!Open Output relay

2100 PRINT "Verify that no signal appears on the scope."

2110 Wait_for_cont

2120 SUBEND

2130 !

(Continued on next page)

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Functional Verification

Example Program (cont’d)

2140 SUB Key_press

2150 COM @Afg,@Cmd_mod,INTEGER Done

2160 Done=1

2170 DISP

2180 SUBEND

2190 !

2200 SUB Wait_for_cont

2210 DISP "Press ’Continue’ when ready"

2220 PAUSE

2230 DISP

2240 SUBEND

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Operation

Verification

Operation Verification is a subset of the Performance Verification tests that

follow. For the AFG, Operation Verification consists of the following tests:

• DC Accuracy

• AC Accuracy

• Total Harmonic Distortion

Performance

Verification

The procedures in this section are used to test the AFG’s electrical

performance using the specifications in Appendix A of the Agilent E1445A

User’s Manual as the performance standards. These tests are suitable for

incoming inspection, troubleshooting, and preventive maintenance. The

results of the Performance Verification tests should be recorded in the

Performance Test Record (Table 2-11).

Performance Verification includes the following tests:

Test #

Test Name

2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

2-9

2-10

DC Zeros

DC Accuracy

DC Offset

AC Accuracy

AC Flatness - 250 kHz filter

AC Flatness - 10 MHz filter

Frequency Accuracy

Duty Cycle

Total Harmonic Distortion

Spurious/Non-harmonic Distortion

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Test 2-1: DC Zeros

Description

The purpose of this test is to verify that the AFG meets its specifications for

DCV accuracy for an output of zero volts. An arbitrary waveform

consisting of zeros is used. The amplitude is varied in order to test each

attenuator.

Equipment Setup

• Connect equipment as shown in Figure 2-5

• Set DMM to: DCV, 100 mV range

Figure 2-5. Equipment Setup for Test 2-1 thru Test 2-4

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Delete all sequences and segments from memory:

LIST:SSEQ:DEL:ALL

LIST:SEGM:DEL:ALL

Delete all sequences

Delete all segments

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Test 2-1: DC Zeros (cont’d)

Test Procedure

(cont’d)

3. Create a user-defined waveform made up of zeros:

LIST:SEGM:SEL ZEROS

LIST:SEGM:DEF 8

LIST:SEGM:VOLT 0,0,0,0,0,0,0,0

Select segment name

# of segment points

Segment list

LIST:SSEQ:SEL DC_ZEROS

LIST:SSEQ:DEF 1

Select sequence name

# of segments

LIST:SSEQ:SEQ ZEROS

Sequence list

4. Set up the AFG to output the waveform defined above:

ROSC:SOUR CLK10;

:VOLT MAX;

Select 10 MHz clock

Set amplitude

:OUTP:LOAD INF;

:FUNC USER

FUNC:USER DC_ZEROS

INIT:IMM

Infinite load

Select user waveform

Select sequence

Initiate waveform

Perform steps 5 - 7 for each amplitude listed in Table 2-1:

5. Set the AFG output filter as specified in Table 2-1. Use the

appropriate command(s) below:

OUTP:FILT OFF

Disable filter

OUTP:FILT:FREQ 250KHZ

OUTP:FILT ON

Select 250 kHz filter

Enable filter

OUTP:FILT:FREQ 10MHZ

OUTP:FILT ON

Select 10 MHz filter

Enable filter

6. Set the AFG output amplitude:

VOLT <amplitude>

Set amplitude

where <amplitude> is the value specified in Table 2-1.

7. Trigger the DMM and record the reading in Table 2-11.

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Test 2-1: DC Zeros (cont’d)

Test Procedure

(cont’d)

Table 2-1. DC Zeros Test Points

Attenuation Amplitude

Filter

Test Limits

(volts)

(dB)

(volts)

.99

10.23750

9.13469

9.12416

8.13192

6.45941

4.07560

2.29187

2.04263

0.32372

None

0.0220

0.0044

250 kHz

.99

10.23750

9.13469

9.12416

8.13192

6.45941

4.07560

2.29187

2.04263

0.32372

0.0220

0.0044

10 MHz

.99

10.23750

9.13469

9.12416

8.13192

6.45941

4.07560

2.29187

2.04263

0.32372

0.0220

0.0044

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Test 2-1: DC Zeros (cont’d)

Example Program

This program performs the DC Zeros test. An arbitrary waveform, consisting of zeros, is used with various

amplitudes to test a variety of attenuator and filter combinations.

10! RE-STORE "DC_ZEROS"

20 COM @Afg

30 DIM Attn(1:9),Vout(1:9)

50 !---------- Set up I/O path and reset AFG ----------

60 ASSIGN @Afg TO 70910

70 OUTPUT @Afg;"*RST;*CLS"

!Reset AFG

90 !---------- Initialize variables ----------

100 DATA 0,.99,1,2,4,8,13,14,30

110 READ Attn(*)

!Read in attenuations

120

130 DATA 10.2375,9.13469,9.12416,8.13192,6.45941,4.0756

140 DATA 2.29187,2.04263,0.32372

150 READ Vout(*)

160

170 !---------- Set up DMM ----------

180 PRINT "Set up DMM:"

190 PRINT

200 PRINT " Function -- DCV"

210 PRINT " Range -- 100 mV"

220 PRINT

230 PRINT "Connect DMM HI and LO to AFG Output."

240 DISP "Press ’Continue’ when ready"

250 PAUSE

260 CLEAR SCREEN

270

280 !---------- Set up AFG ----------

290 OUTPUT @Afg;"*RST"

!Reset AFG

300 OUTPUT @Afg;"LIST:SSEQ:DEL:ALL"

310 OUTPUT @Afg;"LIST:SEGM:DEL:ALL"

320 WAIT .5

!Delete all sequences

!Delete all segments

330 OUTPUT @Afg;"ROSC:SOUR CLK10;";

340 OUTPUT @Afg;":VOLT MAX;";

350 OUTPUT @Afg;":OUTP:LOAD INF;";

360 OUTPUT @Afg;":FUNC USER"

!10MHZ clock

!MAX output

!Infinite load

!User waveform

370

380 CALL Def_seq_zeros

390 OUTPUT @Afg;"FUNC:USER DC_ZEROS"

400 OUTPUT @Afg;"INIT:IMM"

!Define waveform

!Select sequence

410

420 !---------- Perform test ----------

430 PRINT "ATTEN","FILTER","AMPLITUDE"

(Continued on next page)

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Test 2-1: DC Zeros (cont’d)

Example Program (cont’d)

440 PRINT

460 FOR Filter=0 TO 2

470

480

490

500

510

520

530

540

550

560

570

580

590

600

610

620

630

640

650

660

670

680

690

SELECT Filter

CASE 0

OUTPUT @Afg;"OUTP:FILT OFF"

Filter$="NONE"

!No filter

CASE 1

!250KHZ filter

OUTPUT @Afg;"OUTP:FILT:FREQ 250KHZ"

OUTPUT @Afg;"OUTP:FILT ON"

Filter$="250 kHz"

CASE 2

OUTPUT @Afg;"OUTP:FILT:FREQ 10MHZ"

OUTPUT @Afg;"OUTP:FILT ON"

Filter$="10 MHz"

END SELECT

!10MHZ filter

FOR I=1 TO 9

OUTPUT @Afg;":VOLT "&VAL$(Vout(I))

PRINT Attn(I),Filter$,Vout(I)

DISP "Record DMM reading, then press ’Continue’"

PAUSE

DISP

NEXT I

!Loop through atten’s

!Set AFG amplitude

!Next attenuation

!Next filter

700 NEXT Filter

710

720 OUTPUT @Afg;"*RST;*CLS"

730 END

!Reset AFG

740

750 SUB Def_seq_zeros

760

770

780

790

800

810

820

830

COM @Afg

OUTPUT @Afg;"LIST:SEGM:SEL ZEROS"

OUTPUT @Afg;"LIST:SEGM:DEF 8"

OUTPUT @Afg;"LIST:SEGM:VOLT 0,0,0,0,0,0,0,0" !Voltage points

OUTPUT @Afg;"LIST:SSEQ:SEL DC_ZEROS"

OUTPUT @Afg;"LIST:SSEQ:DEF 1"

!Segment name

!Segment length

!Sequence name

!# of segments

!Segment list

OUTPUT @Afg;"LIST:SSEQ:SEQ ZEROS"

840 SUBEND

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Test 2-2: DC Accuracy

Description

The purpose of this test is to verify that the AFG meets its specifications for

DC accuracy.

Equipment Setup

Test Procedure

• Connect equipment as shown in Figure 2-5

• Set DMM to DCV, autorange

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set up the AFG to output a DC signal:

FUNC DC;

:OUTP:LOAD INF;

:VOLT MAX

Select DC waveform

Infinite load

Set amplitude

Perform steps 3 - 5 for each amplitude listed in Table 2-2:

3. Set up the AFG output filter as specified in Table 2-2. Use the

appropriate command(s) below:

OUTP:FILT OFF

Disable filter

OUTP:FILT:FREQ 250KHZ

OUTP:FILT ON

Select 250 kHz filter

Enable filter

OUTP:FILT:FREQ 10MHZ

OUTP:FILT ON

Select 10 MHz filter

Enable filter

4. Set the AFG output amplitude:

VOLT <amplitude>

Set amplitude

where <amplitude> is the value specified in Table 2-2.

5. Trigger the DMM and record the reading.

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Test 2-2: DC Accuracy (cont’d)

Test Procedure

(cont’d)

Table 2-2. DC Accuracy Test Points

Amplitude

(volts)

Filter

Test Limits

(volts)

10.2375

5.0

None

250 kHz

10 MHz

10.2375 0.0512

5.0 0.0355

0.0

-5.0

0.0 0.0205

-5.0 0.0355

-10.24

10.2375

-10.24

10.2375

-10.24

-10.24 0.0512

10.2375 0.0512

-10.24 0.0512

10.2375 0.0512

10.24 0.0512

Example Program

This program performs the DC Accuracy test.

10! RE-STORE "DC_LEVELS"

DIM Vout(1:9),Filter(1:9)

!---------- Set up I/O path and reset AFG -----------

ASSIGN @Afg TO 70910

OUTPUT @Afg;"*RST;*CLS"

!Reset AFG

!---------- Initialize variables ----------

DATA 10.2375,5.0,0,-5.0,-10.24,10.2375,-10.24,10.2375,-10.24

100 READ Vout(*)

110

120 DATA 0,0,0,0,0,1,1,2,2

130 READ Filter(*)

140

150 !---------- Set up DMM ----------

160 CLEAR SCREEN

170 PRINT "Set up DMM:"

180 PRINT

190 PRINT " Function -- DCV"

200 PRINT " Range -- AUTO"

210 PRINT

220 PRINT "Connect DMM HI and LO to AFG Output."

230 DISP "Press ’Continue’ when ready"

240 PAUSE

250 CLEAR SCREEN

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Test 2-2: DC Accuracy (cont’d)

Example Program (cont’d)

270 !---------- Set up AFG ----------

280 OUTPUT @Afg;"*RST"

290 WAIT .5

!Reset AFG

300 OUTPUT @Afg;"FUNC DC;";

310 OUTPUT @Afg;":OUTP:LOAD INF;";

320 OUTPUT @Afg;":VOLT MAX"

!DC function

!Infinite load

!MAX output

330

340 !---------- Perform test ----------

350 PRINT "FILTER","AMPLITUDE"

360 PRINT

370

380 FOR I=1 TO 9

SELECT Filter(I)

CASE 0

OUTPUT @Afg;"OUTP:FILT OFF"

Filter$="NONE"

CASE 1

390

400

410

420

430

440

450

460

470

480

490

500

510

520

530

540

550

560

570

580

!No filter

OUTPUT @Afg;"OUTP:FILT:FREQ 250KHZ"

OUTPUT @Afg;"OUTP:FILT ON"

Filter$="250 kHz"

!250kHz filter

CASE 2

OUTPUT @Afg;"OUTP:FILT:FREQ 10MHZ"

OUTPUT @Afg;"OUTP:FILT ON"

Filter$="10 MHz"

END SELECT

!10MHz filter

OUTPUT @Afg;"VOLT "&VAL$(Vout(I))

PRINT Filter$,Vout(I)

DISP "Record DMM reading, then press ’Continue’"

PAUSE

DISP

!Set amplitude

590 NEXT I

600

610 OUTPUT @Afg;"*RST;*CLS"

620 END

!Reset AFG

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Test 2-3: DC Offset

Description

The purpose of this test is to verify that the AFG meets its specifications for

DC offset accuracy.

Equipment Setup

Test Procedure

• Connect equipment as shown in Figure 2-5

• Set DMM to DCV, autorange

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Delete all sequences and segments from memory:

LIST:SSEQ:DEL:ALL

LIST:SEGM:DEL:ALL

Delete all sequences

Delete all segments

3. Create a user-defined waveform made up of zeros:

LIST:SEGM:SEL ZEROS

LIST:SEGM:DEF 8

LIST:SEGM:VOLT 0,0,0,0,0,0,0,0

Select segment name

# of segment points

Segment list

LIST:SSEQ:SEL DC_ZEROS

LIST:SSEQ:DEF 1

Select sequence name

# of segments

LIST:SSEQ:SEQ ZEROS

Sequence list

4. Set up the AFG to output the waveform defined above:

ROSC:SOUR CLK10;

:OUTP:LOAD INF;

:VOLT MAX;

Select 10 MHz clock

Infinite load

Set amplitude

:FUNC USER

FUNC:USER DC_ZEROS

INIT:IMM

Select user waveform

Select sequence

Initiate waveform

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Test 2-3: DC Offset (cont’d)

Test Procedure

(cont’d)

Perform steps 5 - 7 for each offset listed in Table 2-3:

5. If necessary, change the AFG output amplitude:

VOLT:OFFS 0;

:VOLT <amplitude>

Set offset to 0

Set amplitude

where <amplitude> is the value specified in Table 2-3.

6. Set AFG offset voltage:

VOLT:OFFS <offset>

Set offset

where <offset> is the value specified in Table 2-3.

7. Trigger the DMM and record the reading.

Table 2-3. DC Offset Test Points

Offset

(volts)

Amplitude

(volts)

Test Limits

(volts)

9.755

4.000

-4.000

-9.755

2.000

-2.000

2.29189

0.40756

9.755 0.1196

4.0 0.0620

-4.0 0.0620

-9.755 0.1196

2.0 0.0244

-2.0 0.0244

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Test 2-3: DC Offset (cont’d)

Example Program

This program performs the DC Offset Test.

10! RE-STORE "DC_OFFSET"

20 COM @Afg

30 DIM Offset(1:6)

50 !---------- Set up I/O path and reset AFG ----------

60 ASSIGN @Afg TO 70910

70 OUTPUT @Afg;"*RST;*CLS"

!AFG I/O path

!Reset AFG

90 !---------- Initialize variables ----------

100 DATA 9.755,4.0,-4.0,-9.755,2.0,-2.0

110 READ Offset(*)

!Read in offsets

!Initialize

120

130 Vout_old=0

140

150 !---------- Set up DMM ----------

160 CLEAR SCREEN

170 PRINT "Set up DMM:"

180 PRINT

190 PRINT " Function -- DCV"

200 PRINT " Range -- AUTO"

210 PRINT

220 PRINT "Connect DMM HI and LO to AFG Output."

230 DISP "Press ’Continue’ when ready"

240 PAUSE

250 CLEAR SCREEN

260

270 !---------- Set up AFG ----------

280 OUTPUT @Afg;"*RST"

!Reset AFG

290 OUTPUT @Afg;"LIST:SSEQ:DEL:ALL"

300 OUTPUT @Afg;"LIST:SEGM:DEL:ALL"

310 WAIT .5

!Delete all sequences

!Delete all segments

320 OUTPUT @Afg;"ROSC:SOUR CLK10;";

330 OUTPUT @Afg;":OUTP:LOAD INF;";

340 OUTPUT @Afg;":VOLT MAX;";

350 OUTPUT @Afg;":FUNC USER"

!10MHz clock

!Infinite load

!MAX output

!User waveform

360

370 CALL Def_seq_zeros

380 OUTPUT @Afg;"FUNC:USER DC_ZEROS"

!Define sequence of zeros

!Select sequence

390

400 !---------- Perform test ----------

410 PRINT "AMPLITUDE"," OFFSET"

420 PRINT

430

(Continued on next page)

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Test 2-3: DC Offset (cont’d)

Example Program (cont’d)

440 FOR I=1 TO 6

450

460

470

480

490

500

510

520

530

540

550

560

570

580

590

600

610

620

630

IF I<=4 THEN

Vout=2.2919

ELSE

Vout=.40756

END IF

IF Vout<>Vout_old THEN

!Set offset to zero before changing amplitude

OUTPUT @Afg;":VOLT:OFFS 0;";

OUTPUT @Afg;":VOLT "&VAL$(Vout)&";";

END IF

OUTPUT @Afg;":VOLT:OFFS "&VAL$(Offset(I))!Set offset

PRINT Vout,Offset(I)

DISP "Record DMM reading, then press ’Continue’"

PAUSE

DISP

Vout_old=Vout

640 NEXT I

650

660 OUTPUT @Afg;"*RST;*CLS"

670 END

!Next attenuation

!Reset AFG

680

690 SUB Def_seq_zeros

700

710

720

730

740

750

760

770

COM @Afg

OUTPUT @Afg;"LIST:SEGM:SEL ZEROS"

OUTPUT @Afg;"LIST:SEGM:DEF 8"

OUTPUT @Afg;"LIST:SEGM:VOLT 0,0,0,0,0,0,0,0" !Voltage points

OUTPUT @Afg;"LIST:SSEQ:SEL DC_ZEROS"

OUTPUT @Afg;"LIST:SSEQ:DEF 1"

!Segment name

!Segment length

!Sequence name

!# of segments

!Segment list

OUTPUT @Afg;"LIST:SSEQ:SEQ ZEROS"

780 SUBEND

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Test 2-4: AC Accuracy

Description

The purpose of this test is to verify that the AFG meets its specifications for

AC accuracy at 1 kHz.

Equipment Setup

Test Procedure

• Connect equipment as shown in Figure 2-5

• Set DMM to ACV, autorange

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set up the AFG to output a 1 kHz sinewave:

FREQ 1E3;

:VOLT MAX;

:OUTP:LOAD INF

CAL:STAT:AC OFF

INIT:IMM

Set freq to 1 kHz

Set to max amplitude

Infinite load

AC corrections off

Initiate waveform

Perform steps 3 - 5 for each amplitude and filter listed in Table 2-4:

3. Set up AFG output filter as specified in Table 2-4. Use the

appropriate command(s) below:

OUTP:FILT OFF

Disable filter

OUTP:FILT:FREQ 250KHZ

OUTP:FILT ON

Select 250 kHz filter

Enable filter

OUTP:FILT:FREQ 10MHZ

OUTP:FILT ON

Select 10 MHz filter

Enable filter

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Test 2-4: AC Accuracy (cont’d)

Test Procedure

(cont’d)

4. Set the AFG output amplitude:

VOLT <amplitude>VRMS

Set amplitude

where <amplitude> is the value specified in Table 2-4.

5. Trigger the DMM and record the reading.

Table 2-4. AC Accuracy Test Points

Amplitude

(volts rms)

Filter

Test

Limits

(dB)

7.2390

6.4500

5.7500

4.5660

2.8818

1.4444

0.2290

7.2390

None

250 kHz

10 MHz

0.10

0.15

0.10

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Test 2-4: AC Accuracy (cont’d)

Example Program

This program performs the AC Accuracy Test.

10! RE-STORE "AC_LEVELS"

20 DIM Vout(1:9),Filter(1:9)

40 !---------- Set up I/O path and reset AFG ----------

50 ASSIGN @Afg TO 70910

60 OUTPUT @Afg;"*RST;*CLS"

!Reset AFG

80 !---------- Initialize variables ----------

90 DATA 7.239,6.45,5.75,4.566,2.8818,1.4444,.229,7.239,7.239

100 READ Vout(*)

110

120 DATA 0,0,0,0,0,0,0,1,2

130 READ Filter(*)

140

150 !---------- Set up DMM ----------

160 CLEAR SCREEN

170 PRINT "Set up DMM:"

180 PRINT

190 PRINT " Function -- ACV"

200 PRINT " Range -- AUTO"

210 PRINT

220 PRINT "Connect DMM HI and LO to AFG Output."

230 DISP "Press ’Continue’ when ready"

240 PAUSE

250 CLEAR SCREEN

260

270 !---------- Set up AFG ----------

280 OUTPUT @Afg;"*RST"

290 WAIT .5

!Reset AFG

300 OUTPUT @Afg;"FREQ 1E3;";

310 OUTPUT @Afg;":VOLT MAX;";

320 OUTPUT @Afg;":OUTP:LOAD INF"

340 OUTPUT @Afg;"CAL:STAT:AC OFF"

350 OUTPUT @Afg;"INIT:IMM"

360 WAIT .5

!Set freq to 1 kHz

!MAX amplitude

!Infinite load

!AC corrections off

!Initiate

370

380 !---------- Perform test ----------

390 PRINT "FILTER","AMPLITUDE"

400 PRINT

410

(Continued on next page)

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Test 2-4: AC Accuracy (cont’d)

Example Program (cont’d)

420 FOR I=1 TO 9

430

440

450

460

470

480

490

500

510

520

530

540

550

560

570

580

590

600

610

620

SELECT Filter(I)

CASE 0

OUTPUT @Afg;"OUTP:FILT OFF"

Filter$="NONE"

!No filter

CASE 1

OUTPUT @Afg;"OUTP:FILT:FREQ 250KHZ"

OUTPUT @Afg;"OUTP:FILT ON"

Filter$="250 kHz"

CASE 2

OUTPUT @Afg;"OUTP:FILT:FREQ 10MHZ"

OUTPUT @Afg;"OUTP:FILT ON"

Filter$="10 MHz"

END SELECT

OUTPUT @Afg;":VOLT "&VAL$(Vout(I))&"VRMS"

PRINT Filter$,Vout(I)

WAIT .5

DISP "Record DMM reading, then press ’Continue’"

PAUSE

DISP

!250 kHz filter

!10 MHz filter

!Set amplitude

630 NEXT I

640

650 OUTPUT @Afg;"*RST;*CLS"

660 END

!Reset AFG

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Test 2-5: AC Flatness - 250 kHz Filter

Description

The purpose of this test is to verify that the AFG meets its specifications for

AC flatness with the 250 kHz filter enabled.

Equipment Setup

• Connect equipment as shown in Figure 2-6

• Set DMM to ACV, autorange

Figure 2-6. Equipment Setup for Test 2-5 and Test 2-6

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set up the AFG to output a 24 dBm sinewave with the 250 kHz filter

enabled:

VOLT 24DBM;

Set amplitude

50 ohm load

250 kHz filter

Enable filter

:OUTP:LOAD 50

OUTP:FILT:FREQ 250KHZ

OUTP:FILT ON

INIT:IMM

Initiate waveform

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Test 2-5: AC Flatness - 250 kHz Filter (cont’d)

Test Procedure

(cont’d)

3. Set the AFG output to the reference frequency (1 kHz):

FREQ 1000 Set frequency

4. Measure the amplitude with the DMM and convert the reading to

dBm. Note the result for use in step 6:

Reference Level (dBm) = 20 × log 'Reading (volts)'+13.0103

Perform steps 5 - 6 for each frequency listed in Table 2-5:

5. Set the AFG output:

FREQ <frequency>

Set frequency

where <frequency> is the value specified in Table 2-5.

6. Measure the amplitude with the DMM and convert the reading to

dBm. Calculate and record the error relative to the reference level

calculated in step 4:

Reading (dBm) = 20 × log 'Reading (volts)'+13.0103

Error (dB) = Reading (dBm) − Reference Level (dBm)

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Test 2-5: AC Flatness - 250 kHz Filter (cont’d)

Test Procedure

(cont’d)

Table 2-5. AC Flatness Test Points - 250 kHz Filter

Frequency

(Hz)

Test Limits*

(dB error)

Frequency

(Hz)

Test Limits*

(dB error)

10E3

20E3

30E3

40E3

50E3

60E3

70E3

80E3

90E3

100E3

110E3

120E3

130E3

0.05 dB

0.10 dB

140E3

150E3

160E3

170E3

180E3

190E3

200E3

210E3

220E3

230E3

240E3

250E3

0.10 dB

* Error relative to 1 kHz

Example Program

See the AC Flatness Adjustment procedure (Chapter 3) for an example program that performs the AC Flatness

Test (change line 180 to: Mode$="M" ).

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Test 2-6: AC Flatness - 10 MHz Filter

Description

The purpose of this test is to verify that the AFG meets its specifications for

AC flatness with the 10 MHz filter enabled.

Equipment Setup

Test Procedure

• Connect equipment as shown in Figure 2-6

• Set DMM to ACV, autorange

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set up the AFG to output a 24 dBm sinewave with the 10 MHz filter

enabled:

VOLT 24DBM;

Set amplitude

50 ohm load

10 MHz filter

Enable filter

:OUTP:LOAD 50

OUTP:FILT:FREQ 10MHZ

OUTP:FILT ON

INIT:IMM

Initiate waveform

3. Set AFG output to the reference frequency (1 kHz):

FREQ 1000

Set frequency

4. Measure the amplitude with the DMM, convert the reading to dBm,

and note the reading for future reference:

Reference Level (dBm) = 20 × log 'Reading (volts)'+13.0103

5. Set the AFG to the crossover frequency (lowest frequency that the

Power Meter can measure):

FREQ 1E5

Set frequency

6. Measure the amplitude with the DMM and note the reading for future

reference.

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Test 2-6: AC Flatness - 10 MHz Filter (cont’d)

Test Procedure

(cont’d)

7. Set up the Power Meter:

Units - Watts

Power Range - auto

Reference Oscillator - ON

NOTE

Follow the Power Meter manufacturer’s instructions for performing an

autocalibration and correcting for the power sensor.

8. Connect the equipment as shown in Figure 2-7:

Figure 2-7. Equipment Setup for Test 2-6

9. Set the Power Meter expected frequency to the crossover frequency

(100 kHz). Measure the AFG output power and convert the reading

to volts:

√

Reading (volts) =( 'Reading (watts) ' × 50

)

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Test 2-6: AC Flatness - 10 MHz Filter (cont’d)

Test Procedure

(cont’d)

10. Calculate the correction factor that will be used to reference the

Power Meter to the DMM:

DMM reading at 100 kHz (step 6)

Power Meter reading at 100 kHz (step 9)

Correction Factor =

Repeat 11 - 14 for each frequency in Table 2-6:

11. Set the AFG output to the frequency specified in Table 2-6. If the

frequency is less than 10.8 MHz, use the following command:

FREQ <frequency>

where <frequency> is the value specified in Table 2-6. If the

frequency is 10.8 MHz, use the following register commands to set

the output frequency:

DIAG:POKE #HE000A1,8,0

DIAG:POKE #HE000A3,8,126

DIAG:POKE #HE000A5,8,95

DIAG:POKE #HE000A7,8,64

DIAG:POKE #HE0008D,8,0

12. Set the Power Meter expected frequency to the AFG output frequency.

13. Measure the amplitude with the Power Meter, convert the reading to

volts, and multiply by the correction factor.

√

Reading (volts) =( 'Reading (watts) ' × 50

)

Corrected Reading (volts) = Reading (volts) × C.F. (step 10)

14. Convert the reading to dBm. Calculate and record the error relative

to the reference level calculated in step 4:

Reading (dBm) = 20 × log 'Corrected Reading (volts)' +13.0103

Error (dB) = Reading (dBm) − Reference Level (dBm)

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Test 2-6: AC Flatness - 10 MHz Filter (cont’d)

Test Procedure

(cont’d)

Table 2-6. AC Flatness Test Points - 10 MHz Filter

Frequency

(Hz)

Test Limits*

(dB error)

Frequency

(Hz)

Test Limits*

(dB error)

400E3

800E3

1.2E6

1.6E6

2.0E6

2.4E6

2.8E6

3.2E6

3.6E6

4.0E6

4.4E6

4.8E6

5.2E6

5.6E6

0.2 dB

6.0E6

6.4E6

6.8E6

7.2E6

7.6E6

8.0E6

8.4E6

8.8E6

9.2E6

9.6E6

10.0E6

10.4E6

10.8E6

0.2 dB

* Error relative to 1 kHz

Example Program

See the AC Flatness Adjustment procedure (Chapter 3) for an example program that performs the AC Flatness

Test (change line 180 to: Mode$="M" ).

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Test 2-7: Frequency Accuracy

Description

The purpose of this test is to verify that the AFG meets its specifications for

frequency accuracy.

Equipment Setup

• Connect equipment as shown in Figure 2-8

• Set Counter to: Frequency, 50Ω input impedance

Figure 2-8. Equipment Setup for Test 2-7

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

Perform steps 2 - 6 for each entry listed in Table 2-7:

2. Abort the waveform if it has been previously initiated:

ABORT

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Test 2-7: Frequency Accuracy (cont’d)

Test Procedure

(cont’d)

3. Set reference oscillator to INT1 or INT2, as specified in Table 2-7:

ROSC:SOUR INT1

Set ref osc to INT1

Set ref osc to INT2

ROSC:SOUR INT2

4. Set marker source to "ROSC" or "TRIG", as specified in Table 2-7:

MARK:FEED "ROSC"

Set marker source to

"ROSC"

MARK:FEED "TRIG"

Set marker source to

"TRIG"

5. If the marker source is "TRIG", use the following commands to

output a squarewave (otherwise, skip this step):

FUNC SQU;

Select squarewave

Set AFG frequency

Set trig source

Initiate

:FREQ2 <frequency>;

:TRIG:SOUR INT2

INIT:IMM

where <frequency> is the value given in the "Squarewave

Frequency" column of Table 2-7.

NOTE

If the marker source is "TRIG", the marker output frequency will be four

times the frequency of the squarewave, since it takes four points to produce

a squarewave. See Table 2-7 for the expected frequencies.

6. Measure frequency with the Counter and record the reading in Table

2-11.

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Test 2-7: Frequency Accuracy (cont’d)

Test Procedure

(cont’d)

Table 2-7. Frequency Accuracy Test Points

Ref Oscillator

Source

Marker

Source

Squarewave

Frequency (Hz)

Test Limits

(Hz)*

INT1

INT2

"ROSC"

"TRIG"

----------

5.0 E6

3.333 E3

76.294

42.94967 E6 0.005%

40 E6 0.005%

20 E6 0.005%

13.3333 E6 0.005%

305.176 0.005%

*Add aging rate of 20 ppm/year

Example Program

This program performs the Frequency Accuracy Test.

10! RE-STORE "OSC_FREQ"

20 DIM Freq(1:5)

40 !---------- Set up I/O path and reset AFG ----------

50 ASSIGN @Afg TO 70910

60 OUTPUT @Afg;"*RST;*CLS"

!Reset AFG

80 !---------- Initialize variables ----------

90 DATA 42.94967E6,40E6,20E6,13.3333E6,305.176

100 READ Freq(*)

110

120 !---------- Set up Counter ----------

130 CLEAR SCREEN

140 PRINT "Set up Counter:"

150 PRINT

160 PRINT " Function -- Frequency"

170 PRINT " Input Impedance -- 50 ohms"

180 PRINT

190 PRINT "Connect the Counter to ’Marker Out’ on the E1445A."

200 PRINT

210 DISP "Press ’Continue’"

220 PAUSE

230 CLEAR SCREEN

240

(Continued on next page)

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Test 2-7: Frequency Accuracy (cont’d)

Example Program (cont’d)

250 !---------- Set up AFG ----------

260 OUTPUT @Afg;"*RST"

270 WAIT .5

!Reset AFG

280

290 !---------- Perform test ----------

300 FOR I=1 TO 5

310

320

330

340

350

360

370

380

390

400

410

420

430

440

450

460

470

480

490

500

510

520

530

540

550

560

PRINT "Expected reading =";Freq(I)

IF I=1 THEN

OUTPUT @Afg;"ROSC:SOUR INT1"

OUTPUT @Afg;"MARK:FEED ""ROSC"""

ELSE

OUTPUT @Afg;"ABORT"

OUTPUT @Afg;"ROSC:SOUR INT2"

IF Freq(I)=4.0E+7 THEN

OUTPUT @Afg;"MARK:FEED ""ROSC"""

ELSE

!ROSC = INT1

!Marker source = ROSC

!Abort waveform

!ROSC = INT2

!Marker source = ROSC

!Squarewave

OUTPUT @Afg;":FUNC SQU;";

!Square wave freq is 1/4 of marker freq

OUTPUT @Afg;":FREQ2 "&VAL$(Freq(I)/4)&";";

OUTPUT @Afg;":TRIG:STAR:SOUR INT2"!TRIG source = INT2

OUTPUT @Afg;"MARK:FEED ""TRIG""" !Marker source = TRIG

END IF

OUTPUT @Afg;"INIT:IMM"

WAIT 1

DISP "Record the Counter reading, then press ’Continue’"

PAUSE

DISP

!Initiate

570 NEXT I

580

590 OUTPUT @Afg;"*RST;*CLS"

600 END

!Reset AFG

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Test 2-8: Duty Cycle

Description

The purpose of this test is to verify that the AFG meets its specifications for

square wave duty cycle. Duty cycle is determined by measuring positive

pulse width.

Equipment Setup

• Connect equipment as shown in Figure 2-9

• Set Counter to: Pulse Width, DC coupling, 50Ω input impedance

Figure 2-9. Equipment Setup for Test 2-8

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set the AFG to output a square wave:

FUNC SQU;

:VOLT MAX

Select squarewave

Set to max amplitude

Perform steps 3 - 7 for each frequency listed in Table 2-8:

3. Abort the waveform if it has been previously initiated:

ABORT

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Test 2-8: Duty Cycle (cont’d)

Test Procedure

(cont’d)

4. Set the AFG frequency range as specified in Table 2-8:

FREQ:RANG MAX

FREQ:RANG MIN

Enable doubling

Disable doubling

5. Set AFG output frequency:

FREQ <frequency>

Set frequency

where <frequency> is the value specified in Table 2-8.

6. Initiate the waveform:

INIT:IMM

7. Measure positive pulse width (average at least 10 periods) with the

Counter and record the reading in Table 2-11.

NOTE

If a percentage result is desired, measure the period (average at least 10

periods. Duty Cycle (%) = 100 x (Positive Pulse Width/Period)

Table 2-8. Duty Cycle Test Points

Frequency

(Hz)

Frequency

Range

Test Limits

(sec)

1.0 E3

2.0 E3

2.5 E5

5.0 E5

MIN

MAX

MIN

MAX

5.0E-3 1.0E-6

2.5E-4 3.0E-5

2.0E-7 3.4E-9

1.0E-7 1.5E-8

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Test 2-8: Duty Cycle (cont’d)

Example Program

This program performs the Duty Cycle Test.

10! RE-STORE "DUTY_CYCLE"

20 DIM Freq(1:4),Range$(1:4)[10]

40 !---------- Set up I/O path and reset AFG ----------

50 ASSIGN @Afg TO 70910

60 OUTPUT @Afg;"*RST;*CLS"

!Reset AFG

80 !---------- Initialize variables ----------

90 DATA 1E3,2E3,2.5E5,5E5

100 READ Freq(*)

110

120 DATA MIN,MAX,MIN,MAX

130 READ Range$(*)

!’MAX’ enables doubling

!’MIN’ disables doubling

140

150 !---------- Set up Counter ----------

160 CLEAR SCREEN

170 PRINT "Set up Counter:"

180 PRINT " Function -- Pulse Width"

190 PRINT " Coupling -- DC"

210 PRINT " Input Impedance -- 50 ohms"

220 PRINT

230 PRINT "Connect Counter to AFG Output."

240 DISP "Press ’Continue’ when ready"

250 PAUSE

260 CLEAR SCREEN

270

280 !---------- Set up AFG ----------

290 OUTPUT @Afg;"*RST"

300 OUTPUT @Afg;"FUNC SQU;";

310 OUTPUT @Afg;":VOLT MAX"

!Reset AFG

!Squarewave

!MAX output

320

330 !---------- Perform test ----------

340 FOR I=1 TO 4

350

360

370

380

390

400

OUTPUT @Afg;"ABORT"

OUTPUT @Afg;"FREQ:RANG "&Range$(I)&";";

OUTPUT @Afg;":FREQ "&VAL$(Freq(I))

OUTPUT @Afg;"INIT:IMM"

WAIT 1

!Abort waveform

!Freq doubling on/off

!Set frequency

!Initiate

(Continued on next page)

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Test 2-8: Duty Cycle (cont’d)

Example Program (cont’d)

410

420

430

440

450

460

470

480

490

500

510

520

530

540

550

560

570

580

590

!Take readings here

PRINT "Output Frequency =";Freq(I);" Hz"

PRINT "Read positive pulse width (average at least 10 periods)."

INPUT "Enter positive pulse width (in sec):",Pos_width

PRINT "Set Counter to measure period (average at least 10 periods)."

INPUT "Enter period (in sec):",Period

!Calculate duty cycle

Duty_cycle=(Pos_width/(Period))*100

Duty_cycle=PROUND(Duty_cycle,-2)

PRINT "Positive Pulse Width = "&VAL$(Pos_width)

PRINT "Duty Cycle = "&VAL$(Duty_cycle)&"%"

DISP "Press ’Continue’ when ready"

PAUSE

CLEAR SCREEN

600 NEXT I

610

620 OUTPUT @Afg;"*RST;*CLS"

630 END

!Reset AFG

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Test 2-9: Total Harmonic Distortion

Description

The purpose of this test is to verify that the AFG meets its specifications for

sine wave total harmonic distortion (THD).

Equipment Setup

• Connect equipment as shown in Figure 2-10

• Set Spectrum Analyzer to:

Ref Level = 25 dBm

Freq Span = 1 kHz

Resolution BW = 30 Hz

Video BW = 30 Hz

NOTE

These are recommended settings only. Adjust your Spectrum Analyzer as

necessary.

Figure 2-10. Equipment Setup for Test 2-9 and Test 2-10

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Test 2-9: Total Harmonic Distortion (cont’d)

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set the AFG to output a sinewave with the 10 MHz filter enabled:

VOLT 24DBM

Set AFG amplitude

Set filter to 10 MHz

Enable filter

OUTP:FILT:FREQ 10 MHZ

OUTP:FILT ON

INIT:IMM

Initiate waveform

Perform steps 3 - 6 for each frequency listed in Table 2-9:

3. Set AFG output frequency:

FREQ <frequency>

Set frequency

where <frequency> is the value specified in Table 2-9.

4. Set the Spectrum Analyzer center frequency to the output frequency

of the AFG. Measure the peak amplitude of the fundamental in dBm.

Note the result for use in step 6.

5. Set the Spectrum Analyzer center frequency to the second harmonic (

2 × fundamental frequency ). Measure the peak amplitude of the

second harmonic in dBm.

6. Repeat step 5 for third through ninth harmonics. Calculate total

harmonic distortion as shown below:

√

ꢀ

thd (dBc) = 20 ⋅ log

result₂+ result₃+ … +result ₉

where

result_n(volts) = 10

[ (n^thHarmonic (dBm) − Fundamental (dBm))/20 ]

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Test 2-9: Total Harmonic Distortion (cont’d)

Test Procedure

(cont’d)

Table 2-9. THD Test Points

Frequency

(Hz)

Test Limits*

(dBc)

100 E3

250 E3

1 E6

4 E6

10 E6

-60

-48

-36

* Through 9th harmonic

Example Program

This program performs the Total Harmonic Distortion Test.

10 ! RE-STORE "SINE_THD"

20 DIM Freq(1:5)

40 !---------- Set up I/O path and reset AFG ----------

50 ASSIGN @Afg TO 70910

60 OUTPUT @Afg;"*RST;*CLS"

!AFG I/O path

!Reset AFG

80 !---------- Initialize variables ----------

90 Dbm_out$="24DBM"

!AFG output

100

110 DATA 100E3,250E3,1E6,4E6,10E6

120 READ Freq(*)

!Read in freqs

130

140 !---------- Set up Spec Analyzer ----------

150 CLEAR SCREEN

160 PRINT "Set up Spectrum Analyzer:"

170 PRINT

180 PRINT " Ref Level = 25 dBm"

190 PRINT " Span = 1 kHz"

200 PRINT " Resolution BW = 30 Hz"

210 PRINT " Video BW = 30 Hz"

220 PRINT

(Continued on next page)

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Test 2-9: Total Harmonic Distortion (cont’d)

Example Program (cont’d)

230 PRINT "Connect Spectrum Analyzer to AFG Output."

240 DISP "Press ’Continue’ when ready"

250 PAUSE

260

270 !---------- Set up AFG ----------

280 OUTPUT @Afg;"*RST"

!Reset AFG

290 WAIT 1

300 OUTPUT @Afg;"VOLT "&Dbm_out$

310 OUTPUT @Afg;"OUTP:FILT:FREQ 10MHZ"

320 OUTPUT @Afg;"OUTP:FILT ON"

330 OUTPUT @Afg;"INIT:IMM"

!Set AFG output

!Enable 10MHz filter

!Initiate

340

350 !---------- Perform test ----------

360 FOR I=1 TO 5

370

380

390

400

410

420

430

440

450

OUTPUT @Afg;"FREQ "&VAL$(Freq(I))

!Set frequency

!Measure THD

CALL Meas_thd(Freq(I),Thd)

PRINT "Fundamental Frequency =";Freq(I)

PRINT "THD =";DROUND(Thd,4);"dBc"

DISP "Press ’Continue’ when ready"

PAUSE

DISP

460 NEXT I

470

480 OUTPUT @Afg;"*RST;*CLS"

490 END

!Reset AFG

500

510

520 !---------- Measurement subprogram ----------

530 SUB Meas_thd(Frequency,Thd)

540

550

560

570

580

590

INTEGER Harmonic

CLEAR SCREEN

Harmonic=1

GOSUB Meas_fund

!Get fundamental amplitude

(Continued on next page)

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Test 2-9: Total Harmonic Distortion (cont’d)

Example Program (cont’d)

600

610

620

630

640

650

660

670

680

690

!Measure harmonics 2-9

Sum_amp_sqr=0

FOR Harmonic=2 TO 9

GOSUB Meas_amp

Sum_amp_sqr=Sum_amp_sqr+10^(Result/10)

NEXT Harmonic

Thd=20*LGT(SQRT(Sum_amp_sqr))

SUBEXIT

!Sum of squared voltages

!Calculate THD In dBc

700 Meas_fund: !

710

720

730

740

750

760

770

PRINT "FUNDAMENTAL"

PRINT "Set Spectrum Analyzer Center Freq to: "&VAL$(Frequency)&" Hz."

PRINT "Measure amplitude at the center frequency."

INPUT "Enter amplitude (in dBm):",Baseline

RETURN

780 Meas_amp: !

790

800

810

820

830

840

850

PRINT "HARMONIC =";Harmonic

PRINT "Set Spectrum Analyzer Center Freq to: "&VAL$(Frequency*Harmonic)&" Hz."

PRINT "Measure amplitude at the center frequency."

INPUT "Enter amplitude (in dBm):",Reading

Result=Reading-Baseline

RETURN

860 SUBEND

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Test 2-10: Spurious/Non-Harmonic Distortion

Description

The purpose of this test is to verify that the AFG meets its specifications for

non-harmonic and spurious distortion.

Equipment Setup

• Connect equipment as shown in Figure 2-9

• Set Spectrum Analyzer to :

Ref Level = -5 dBm

Resolution BW = 3 kHz

Video BW = 3 kHz

NOTE

These are recommended settings only. Adjust your Spectrum Analyzer as

necessary.

Test Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Set the AFG to output a -5 dBm, 10 MHz sinewave with the 10 MHz

filter enabled:

FREQ 1.0E7;

:VOLT -5DBM

OUTP:FILT:FREQ 10 MHZ

OUTP:FILT ON

INIT:IMM

Set AFG frequency

Set AFG amplitude

Set filter to 10 MHz

Enable filter

Initiate waveform

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Test 2-10: Spurious/Non-Harmonic Distortion (cont’d)

Test Procedure

(cont’d)

Perform steps 3 and 4 for each frequency range listed in Table 2-10:

3. Set the Spectrum Analyzer start frequency and stop frequency to the

values listed in Table 2-10.

4. Measure the amplitude (in dBm) of the highest peak. Subtract the

amplitude of the fundamental (-5dBm) from the reading and record

the result in Table 2-11:

result (dBc) = reading (dBm) − (−5 dBm)

Table 2-10. Spurious/Non-Harmonic Test Points

Start

Frequency

(Hz)

Stop

Frequency

(Hz)

Test Limits

(dBc)

100 E3

10.5 E6

21 E6

31 E6

41 E6

51 E6

75 E6

100 E6

125 E6

9.5 E6

19 E6

29 E6

39 E6

49 E6

75 E6

100 E6

125 E6

150 E6

-45

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Test 2-10: Spurious/Non-Harmonic Distortion (cont’d)

Example Program

This program performs the Spurious/Non-harmonic Test.

10 ! RE-STORE "NON_HARM"

20 DIM Start_freq(1:9),Stop_freq(1:9),Max_ampl(1:9)

40 !---------- Set up I/O path and reset AFG ----------

50 ASSIGN @Afg TO 70910

60 OUTPUT @Afg;"*RST;*CLS"

!AFG I/O path

!Reset AFG

80 !---------- Initialize variables ----------

90 Freq_out=1.0E+7

!Freq = 10 MHz

100 Dbm_out$="-5DBM"

!Amplitude = -5dBm

110

120 DATA 100E3,10.5E6,21E6,31E6,41E6,51E6,75E6,100E6,125E6

130 READ Start_freq(*) !Read start freqs

140

150 DATA 9.5E6,19E6,29E6,39E6,49E6,75E6,100E6,125E6,150E6

160 READ Stop_freq(*) !Read stop freqs

170

180 !---------- Set up Spec Analyzer ----------

190 CLEAR SCREEN

200 PRINT "Set up Spectrum Analyzer:"

210 PRINT

220 PRINT " Ref Level = -5dBm"

230 PRINT " Resolution BW = 3 kHz"

240 PRINT " Video BW = 3 kHz"

250 PRINT

260 PRINT "Connect Spectrum Analyzer to AFG Output."

270 DISP "Press ’Continue’ when ready"

280 PAUSE

290 CLEAR SCREEN

300

310 !---------- Set up AFG ----------

320 OUTPUT @Afg;"*RST"

!Reset AFG

330 WAIT 1

340 OUTPUT @Afg;"FREQ "&VAL$(Freq_out)&";";

350 OUTPUT @Afg;":VOLT "&Dbm_out$

360 OUTPUT @Afg;"OUTP:FILT:FREQ 10MHZ"

370 OUTPUT @Afg;"OUTP:FILT ON"

380 OUTPUT @Afg;"INIT:IMM"

!Set frequency

!Set amplitude

!Enable 10MHz filter

!Initiate

390

(Continued on next page)

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Test 2-10: Spurious/Non-Harmonic Distortion (cont’d)

Example Program (cont’d)

400 !---------- Perform test ----------

410 FOR I=1 TO 9

420

430

440

450

460

470

480

490

500

510

CLEAR SCREEN

PRINT "Set Spectrum Analyzer Start Freq to: ";Start_freq(I);"Hz"

PRINT "Set Spectrum Analyzer Stop Freq to: ";Stop_freq(I);"Hz"

PRINT "Measure the amplitude of the highest peak."

INPUT "Enter amplitude (in dBm):",Peak_ampl

PRINT "Result =";VAL(Dbm_out$)-Peak_ampl;"dBc" !Calculate result in dBc

DISP "Press ’Continue’ when ready"

PAUSE

DISP

520 NEXT I

530

540 OUTPUT @Afg;"*RST;*CLS"

550 END

!Reset AFG

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Performance

Test Record

Table 2-11, Performance Test Record for the Agilent E1445A AFG, is a

form you can copy and use to record performance verification test results

for the AFG. Table 2-11 shows AFG accuracy, measurement uncertainty,

and test accuracy ratio (TAR) values.

AFG Test Limits Test limits are defined using the specifications in Appendix A of the Agilent

E1445A User’s Manual. The specifications for Total Harmonic Distortion

and Spurious/Non-harmonic Distortion are single-sided (i.e., there is an

upper limit but no lower limit). In the Performance Test Record, the

Minimum column will be blank.

Measurement For the performance verification tests in this manual, the measurement

uncertainties are based on the accuracy specifications for the following test

equipment:

Uncertainty

Performance Test

1. DC Zeros

Test Equipment

Agilent 3458A

2. DC Accuracy

3. DC Offset

4. AC Accuracy

5. AC Flatness (250 kHz filter)

6. AC Flatness (10 MHz filter)*

Agilent 3458A

Agilent 8902A

7. Frequency Accuracy

8. Duty Cycle

Agilent 5334B

Agilent 8566B

9. Total Harmonic Distortion

10. Spurious/Non-harmonic Distortion

* Includes following uncertainties: 8902A Range linearity, 11722A

Power Sensor Cal Factor uncertainty, 3458A accuracy at 100 kHz.

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Test Accuracy Test Accuracy Ratio (TAR) for the E1445A is defined as: AFG

Accuracy/Measurement Uncertainty, i.e.,

Ratio (TAR)

Maximum − Expected Reading

TAR =

Measurement Uncertainty

For single-sided measurements, Test Accuracy Ratio is not defined, so ’NA’

(Not Applicable) will appear in the TAR column. For TARs that exceed

10:1, the entry is ’>10:1’.

74 Verification Tests

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Table 2-11. Performance Test Record for the Agilent E1445A (Page 1 of 7)

Test Facility:

Name _____________________________________

Address _____________________________________

City/State ___________________________________

Phone _____________________________________

Report No. __________________________________

Date _______________________________________

Customer __________________________________

Tested by ___________________________________

Model ____________________________________

Serial No. __________________________________

Options ___________________________________

Firmware Rev. ______________________________

Ambient temperature _______________________^oC

Relative humidity ____________________________%

Line frequency _____________________ Hz (nominal)

Special Notes:

____________________________________________________________________________________________

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Table 2-11. Performance Test Record for the Agilent E1445A (Page 2 of 7)

Model _____________________________ Report No. ____________________________ Date _______________

Test Equipment Used:

Description

Model No.

Trace No.

Cal Due Date

1. _______________________________

2. _______________________________

3. _______________________________

4. _______________________________

5. _______________________________

6. _______________________________

7. _______________________________

8. _______________________________

9. _______________________________

10. ______________________________

11. ______________________________

12. ______________________________

13. ______________________________

14. _____________________________

15. _____________________________

16. _____________________________

17. _____________________________

18. _____________________________

19. _____________________________

20. _____________________________

______________

_______________

______________

_______________

______________

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Table 2-11. Performance Test Record for the Agilent E1445A (Page 3 of 7)

Model _____________________________ Report No. ____________________________ Date _______________

Test

Description*

Measured

Reading

Meas

Uncert

Minimum

Maximum

TAR

Test 2-1. DC Zeros Test (Values in Vdc)

No Filter:

10.2375V (0 dB atten)

9.1347V (.99 dB atten)

9.1241V (1 dB atten)

8.1319V (2 dB atten)

6.4594V (4 dB atten)

4.0756V (8 dB atten)

2.2918V (13 dB atten)

2.0426V (14 dB atten)

0.3238V (30 dB atten)

-0.022

-0.0044

____________

0.022

0.0044

1E-6

>10:1

250 kHz Filter:

10.2375V (0 dB atten)

9.1347V (.99 dB atten)

9.1241V (1 dB atten)

8.1319V (2 dB atten)

6.4594V (4 dB atten)

4.0756V (8 dB atten)

2.2918V (13 dB atten)

2.0426V (14 dB atten)

0.3238V (30 dB atten)

-0.022

-0.0044

____________

0.022

0.0044

1E-6

>10:1

10 MHz Filter:

10.2375V (0 dB atten)

9.1347V (.99 dB atten)

9.1241V (1 dB atten)

8.1319V (2 dB atten)

6.4594V (4 dB atten)

4.0756V (8 dB atten)

2.2918V (13 dB atten)

2.0426V (14 dB atten)

0.3238V (30 dB atten)

-0.022

-0.0044

____________

0.022

0.0044

1E-6

>10:1

* Since the arbitrary waveform consists of zeros, the expected reading is 0 V, regardless of the amplitude

setting. The amplitude is changed in order to turn the various attenuators on and off.

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Table 2-11. Performance Test Record for the Agilent E1445A (Page 4 of 7)

Model _____________________________ Report No. ____________________________ Date _______________

Test

Description

Measured

Reading

Meas

Uncert

Minimum

Maximum

TAR

Test 2-2. DC Accuracy Test (Values in Vdc)

No Filter:

10.2375V

5.0V

10.1863

4.9645

-0.0205

-5.0355

-10.2912

____________

10.2887

5.0355

0.0205

-4.9645

-10.1888

4.9E-5

2.5E-5

1.0E-6

2.5E-5

4.9E-5

>10:1

0.0V

-5.0V

-10.24V

250 kHz Filter:

10.2375V

10.1863

-10.2912

____________

10.2887

-10.1888

4.4E-5

2.3E-5

>10:1

-10.24V

10 MHz Filter:

10.2375V

-10.24V

10.1863

-10.2912

____________

10.2887

-10.1888

4.4E-5

2.3E-5

>10:1

Test 2-3. DC Offset Test (Values in Vdc)

13 dB attenuation:

9.755V

9.6355

3.9380

-4.0620

-9.8746

____________

9.8746

4.0620

-3.9380

-9.6355

4.7E-5

2.04E-5

4.7E-5

>10:1

4.0V

-4.0V

-9.755V

28 dB attenuation:

2.0V

-2.0V

1.9756

-2.0244

____________

2.0244

-1.9756

1.12E-5

>10:1

Test 2-4. AC Accuracy Test (Values in Vac)

No Filter:

7.239V (0 dB atten)

6.45V (1 dB atten)

5.75V (2 dB atten)

4.566V (4 dB atten)

2.881V (8 dB atten)

1.440V (14 dB atten)

0.229V (30 dB atten)

7.1561

6.3396

5.6516

4.4878

2.8317

1.4153

0.2251

____________

7.3228

6.5624

5.8502

4.6455

2.9312

1.4651

0.2330

2.46E-3

2.3E-3

2.16E-3

1.9E-3

1.58E-3

1.29E-3

1.46E-4

>10:1

250 kHz Filter:

7.239V (0 dB atten)

7.1561

____________

7.3228

2.46E-3

>10:1

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10 MHz Filter:

7.239V (0 dB atten)

7.1561

____________

7.3228

2.46E-3

>10:1

Table 2-11. Performance Test Record for the Agilent E1445A (Page 5 of 7)

Model _____________________________ Report No. ____________________________ Date _______________

Test

Description

Measured

Reading

Meas

Uncert

Minimum

Maximum

TAR

Test 2-5. AC FlatnessTest - 250 kHz Filter (Values in dB error, relative to 1 kHz))

Amplitude at 24 dBm:

10 kHz

20 kHz

30 kHz

40 kHz

50 kHz

60 kHz

70 kHz

80 kHz

-0.05

-0.10

____________

0.05

0.10

.002 dB

.0034 dB

.0077 dB

.028 dB

>10:1

7:1

4:1

90 kHz

100 kHz

110 kHz

120 kHz

130 kHz

140 kHz

150 kHz

160 kHz

170 kHz

180 kHz

190 kHz

200 kHz

210 kHz

220 kHz

230 kHz

240 kHz

250 kHz

4:1

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Table 2-11. Performance Test Record for the Agilent E1445A (Page 6 of 7)

Model _____________________________ Report No. ____________________________ Date _______________

Test

Description

Measured

Reading

Meas

Uncert

Minimum

Maximum

TAR

Test 2-6. AC FlatnessTest - 10 MHz Filter (Values in dB error, relative to 1 kHz)

Amplitude at 24 dBm:

400 kHz

800 kHz

1.2 MHz

1.6 MHz

2.0 MHz

2.4 MHz

2.8 MHz

3.2 MHz

3.6 MHz

4.0 MHz

4.4 MHz

4.8 MHz

5.2 MHz

5.6 MHz

6.0 MHz

6.4 MHz

6.8 MHz

7.2 MHz

7.6 MHz

8.0 MHz

8.4 MHz

8.8 MHz

9.2 MHz

9.6 MHz

10.0 MHz

10.4 MHz

10.8 MHz

-0.2

____________

0.2

0.0478 dB

0.0506 dB

0.0536 dB

4:1

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Table 2-11. Performance Test Record for the Agilent E1445A (Page 7 of 7)

Model _____________________________ Report No. ____________________________ Date _______________

Test

Description

Measured

Reading

Meas

Uncert

Minimum

Maximum

TAR

Test 2-7. Frequency Accuracy Test (Values in Hz) *

Marker source is "ROSC":

42.9497 MHz

40.0 MHz

42.9467E6

39.9972E6

____________

42.9527E6

40.0028E6

8.0

>10:1

Marker source is "TRIG":

20.0 MHz

19.9986E6

13.3324E6

305.1546

____________

20.0014E6

13.3342E6

305.1974

5.0

3.8

0.00305

>10:1

7:1

13.3333 MHz

305.176 Hz

Test 2-8. Duty Cycle Test (Values in nsec)

1 kHz, .5 msec pulse width

2 kHz, .25 msec pulse width

4.99E-4

2.2E-4

1.993E-6

8.77E-7

____________

5.01E-4

2.8E-4

2.007E-6

1.123E-6

2.1E-9

1.8E-9

1.2E-9

>10:1

6:1

250 kHz, 2 µsec pulse width

500 kHz, 1 µsec pulse width

>10:1

Test 2-9. Total Harmonic Distortion Test (Values in dBc) **

24 dBm sinewave:

100 kHz

____________

-60 dBc

-48 dBc

-36 dBc

1.23 dB

250 kHz

1 MHz

4 MHz

10 MHz

Test 2-10. Spurious/Non-harmonic Distortion Test (Values in dBc) **

10 MHz, -5 dBm sinewave:

100 kHz - 9.5 MHz

10.5 MHz - 19 MHz

21 MHz - 29 MHz

31 MHz - 39 MHz

41 MHz - 49 MHz

51 MHz - 75 MHz

75 MHz - 100 MHz

100 MHz - 125 MHz

125 MHz - 150 MHz

____________

-45 dBc

1.23 dB

____________

* Test limits assume 1 year of aging @ 20 ppm/year

** Single-sided test -- Minimum is not applicable

Agilent E1445A Service Manual

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Chapter 3

Adjustments

Introduction

The procedures in this chapter show how to perform the following

electronic adjustments for the AFG:

• DC Accuracy

• AC Flatness (250 kHz and 10MHz filters)

• Skew

NOTE

The DC adjustment procedure should be performed before the AC flatness

adjustment procedures.

Required See Table 1-1 for test equipment required for the procedures described in

this chapter.

Equipment

Recommended Before performing these procedures, allow the AFG to warm up for at least

one hour. The temperature should be within 5 C of T (the temperature

cal

Environment

of the most recent calibration), and between 18 C and 28 C.

Calibration Commands

This section provides a brief description of commands that relate to

calibration of the AFG. More information on these commands can be found

in the Command Reference section of the Agilent E1445A User’s Manual.

• CALibration:COUNt? returns the number of times that the AFG

has been calibrated. Each adjustment procedure in this chapter

increments the calibration number by 1.

• CALibration:SECure:CODE <code> sets the code that disables

calibration security. The code is set at the factory to "E1445A".

Calibration security must be disabled before changing the code.

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Calibration Commands (cont’d)

• CALibration:SECure[:STATe] <mode>[,<code>] enables

(<mode> = ON) or disables (<mode> = OFF) calibration security.

The security code is required for CAL:SEC:STAT OFF, but the code

is optional for CAL:SEC:STAT ON. The *RST command also

enables calibration security.

• CALibration[:DC]:BEGin starts the DC calibration sequence and

sets up the AFG for the first calibration point.

• CALibration[:DC]:POINt? <value> sends a value to the AFG so

that the appropriate calibration constant(s) can be calculated. The

AFG returns two numbers: (1) the current calibration point, and (2)

an error code (see Appendix B of the Agilent E1445A User’s Manual

for more information about AFG errors). Any non-zero error code

indicates a failure. This command also sets up the AFG for the next

calibration point.

• CALibration:DATA[:DC] <block> transfers the DC calibration

constants to the AFG. The DC calibration procedure described in

this chapter should be used in place of this command. The query

form returns the current DC constants in IEEE-488.2 definite block

data format.

• CALibration:DATA:AC[1] <block> transfers the AC calibration

constants that are used with the 250 kHz filter. The query form

returns the current constants in IEEE-488.2 definite block data

format. See the AC Flatness Adjustment procedures for more

information on the use of this command.

• CALibration:DATA:AC2 <block> transfers the AC calibration

constants that are used with the 10 MHz filter. The query form

returns the current constants in IEEE-488.2 definite block data

format. See the AC Flatness Adjustment procedures for more

information on the use of this command.

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Calibration Commands (cont’d)

• CALibration:DATA:FILTer <block> transfers the two calibration

constants that are used to determine the frequency points that will be

calibrated for the 10 MHz filter. The query form returns the current

constants in IEEE-488.2 definite block data format. See the AC

Flatness Adjustment procedure for the 10 MHz filter for more

information on the use of this command.

• CALibration:DATA:SKEW <data> transfers the calibration

constant that is used by the skew DAC to synchronize the AFG’s

DAC’s. The query form returns the current constant in IEEE-488.2

definite block data format. See the Skew DAC Adjustment procedure

for more information on the use of this command.

NOTE

The CAL:DATA:FILT and CAL:DATA:SKEW commands are available only

on units with firmware rev A.02.00 or higher (use the *IDN? command to

determine the AFG’s firmware revision).

• CALibration:STATe:AC <state> enables or disables AC

corrections using the calibration constants. If <state> is ON,

corrections will be used. If <state> is OFF, corrections will not be

used.

• CALibration:STATe:DC <state> enables or disables DC

corrections using the calibration constants. If <state> is ON,

corrections will be used. If <state> is OFF, corrections will not be

used.

• CALibration:STATe <state> enables or disables both AC and DC

corrections using the calibration constants. If <state> is ON,

corrections will be used. If <state> is OFF, corrections will not be

used.

• *PUD <data>stores the specified data in non-volatile "protected

user data" memory. The data must be sent in IEEE-488.2 definite or

indefinite block format. The query form (*PUD?) returns the

current protected user data in IEEE-488.2 definite block format.

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Defeating Calibration Security

If the calibration security code is unknown, the security feature can be

defeated by disassembling the AFG and moving the jumper on connector

J104 (see Figure 3-1) to the unsecured position (left-most pins). To prevent

accidental or unauthorized calibration, move the jumper back to the secured

position (right-most pins) as soon as the security code has been set to the

desired value (use the CALibration:SECure:CODE <code> command).

Disassembly instructions can be found in Chapter 5.

Figure 3-1. Disabling Calibration Security

(shown in secured position)

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DC Adjustment Procedure

Description

A DC adjustment is performed on the AFG by reading a series of voltages and

resistances output by the AFG, then entering those values back into the AFG.

After all measurements have been completed, new calibration constants are

calculated and stored in non-volatile memory. To ensure accuracy, perform the

DC calibration procedure at one year intervals.

This procedure uses a firmware routine to adjust the AFG’s DC calibration

constants. The CALibration[:DC]:BEGin command starts the DC calibration

sequence and the CALibration[:DC]:POINt? command steps the AFG to the

next calibration point. All AFG settings are performed by the firmware

routine.

NOTE

If an error occurs at any time during the procedure, abort (*RST) and start over.

Equipment Setup

• Perform a complete autocalibration on the DMM (unless an

autocal has been performed within the last 24 hours)

• Connect the equipment as shown in Figure 3-2

Figure 3-2. DC Adjustment Setup

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DC Adjustment Procedure (cont’d)

Adjustment Procedure

1. Reset the AFG:

*RST;*CLS

Reset AFG and clear

status registers

2. Enable calibration on the AFG:

CAL:SEC:STAT OFF, <security code>

Cal security off

where <code> is the AFG’s security code (factory-set to "E1445A").

3. Send the command to start the DC adjustment routine and wait for the

command to complete:

CAL:DC:BEGIN

*OPC?

The AFG will return a "1" when ready.

Repeat steps 4 through 6 for calibration points 1 - 44:

4. If the current calibration point is listed in Table 3-2, set up the DMM

as specified. Otherwise, do not change the DMM settings. Note the

special instructions for the following points:

Cal Point 31. Immediately after performing the DMM

measurement for cal point 30 (and before sending the reading to

the AFG) set the DMM range to 10 V. This will prevent an

overload when the AFG sets itself for the next reading.

Cal Point 41. Immediately before setting up the DMM for cal

point 41, take a reading using the DMM settings for cal point 40.

This will provide a DC offset reading. Next, set up the DMM

for cal point 41 as specified in Table 3-2. Then use the DC offset

reading and Table 3-1 to determine the appropriate DMM range

for subsequent calibration points.

Cal Point 43. Same instructions as cal point 41.

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DC Adjustment Procedure (cont’d)

Test Procedure

(cont’d)

5. Trigger the DMM and note the reading.

6. Send the reading to the AFG:

CAL:DC:POINT? <reading>

where <reading> is the DMM reading from step 5. The AFG will

return, in order, the number of the current cal point and an error code.

Any non-zero error code indicates a failure.

Table 3-1. DMM Range Setting for Cal Points 41 and 43

Absolute Value

of DC Offset

DMM Range

Less than 10 mV

100 Ω

Between 10 mV and 100 mV

Greater than 100 mV

1000 Ω

Offset too high - abort cal

Table 3-2. DC Calibration Points

Cal

Point

DMM Settings

(changes only)

DCV, 10 V range, 10 NPLC

1 V range, 20 NPLC

10 V*

100 mV range

4-wire ohms, offset comp on*

*See Step 4 of the "DC Adjustment Procedure" for

special instructions.

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DC Adjustment Procedure (cont’d)

Example Program

10 ! RE-STORE "DC_ADJUST"

30 !This program performs the firmware-guided DC adjustment procedure

40 !for the E1445A Arbitrary Function Generator. An 3458A DMM

50 !is required.

70 DIM Results(1:44)

80 INTEGER Cal_point,Max_cal_point,Problem,Err_num

100 !---------- Set up I/O paths ----------

110 ASSIGN @Afg TO 70910

120 ASSIGN @Dmm TO 722

130 !

140 !---------- Initialize variables ----------

150 Max_cal_point=44

160 Cal_point=0

170 Problem=0

180 Secure_code$="E1445A"

190 !

200 !---------- Initialize AFG and DMM ----------

210 OUTPUT @Afg;"*RST;*CLS"

220 OUTPUT @Dmm;"PRESET NORM"

230 !

240 !---------- Connections ----------

250 CLEAR SCREEN

260 PRINT "Connect the DMM to the AFG Output (4-wire connection)"

270 DISP "Press ’Continue’ when ready"

280 PAUSE

290 CLEAR SCREEN

300 !

310 !---------- Setup AFG ----------

320 Cal_point=1

330 OUTPUT @Afg;"CAL:SEC:STATE OFF,"&Secure_code$ !Disable cal security

340 OUTPUT @Afg;"CAL:DC:BEGIN"

350 OUTPUT @Afg;"*OPC?"

360 ENTER @Afg;Not_busy

370 !

!Begin DC cal

!Wait for previous command to finish

380 !---------- Start of loop ----------

390 REPEAT

400

410

420

430

440

DISP "DC Calibration in progress: Cal Point #"&VAL$(Cal_point)

GOSUB Setup_dmm

GOSUB Read_dmm

!Change DMM settings, if necessary

!Get reading

(Continued on next page)

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DC Adjustment Procedure (cont’d)

Example Program (cont’d)

450

460

470

480

490

500

510

520

530

540

IF Cal_point=30 THEN

OUTPUT @Dmm;"RANGE 10"

END IF

OUTPUT @Afg;"CAL:DC:POINT? ";Reading

ENTER @Afg;This_point,Err_num

WAIT .5

!Special case -- set range now

!Send cal value to AFG

!Returns current point,err code

Results(Cal_point)=PROUND(Reading,-5)

Cal_point=Cal_point+1

!Increment Cal_point

550 UNTIL (Err_num<>0) OR (Cal_point>Max_cal_point)

560 !

570 !---------- End of loop ----------

580 !If error, print error number & cal point, else send PUD string

590 IF Err_num=0 THEN

600

610

620

630

PRINT "Calibration Successful"

!Store cal information if desired - place desired data inside quotes

!in following line and remove !’s.

640 ! Pud$="63 CHARACTERS MAX"

650 ! OUTPUT @Afg;"*PUD #0"&Pud$;CHR$(10);END

660 ELSE

!Change Pud$ as desired

670

PRINT "Calibration Error Number "&VAL$(Err_num)&" at Cal Point "&VAL$(Cal_point-1)

680 END IF

690 DISP

700 !

710 !---------- Quit ----------

720 PAUSE

730 OUTPUT @Afg;"CAL:SEC:STATE ON"

740 OUTPUT @Afg;"*RST"

750 OUTPUT @Dmm;"RESET"

760 LOCAL @Dmm

770 !

!Enable cal security

!Reset AFG

!Return DMM to local control

780 ASSIGN @Afg TO *

790 ASSIGN @Dmm TO *

800 STOP

!End of main program

810 !

820 !---------- Subroutines ----------

830 !

840 Setup_dmm:

850 SELECT Cal_point

860 CASE =1

!Cal point 1

870

OUTPUT @Dmm;"FUNC DCV;RANGE 10;NPLC 10;OCOMP OFF"

880 CASE =29

!Cal point 29

890

OUTPUT @Dmm;"RANGE 1;NPLC 1"

(Continued on next page)

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DC Adjustment Procedure (cont’d)

Example Program (cont’d)

900 CASE =31

!Cal point 31

!Cal point 33

!Cal point 41,43

910

OUTPUT @Dmm;"RANGE 10"

920 CASE =33

930

OUTPUT @Dmm;"RANGE .1"

940 CASE =41,=43

950

960

OUTPUT @Dmm;"FUNC DCV;RANGE .1"

GOSUB Read_dmm

!Read voltage - this will

!Determine ohms range for

!Measurements that follow

970

980

990

1000

1010

1020

1030

1040

1050

1060

1070

1080

1090

1100

OUTPUT @Dmm;"FUNC OHMF;OCOMP ON"

!Determine proper DMM range, using rdg from a few lines up

SELECT ABS(Reading)

CASE <=1.0E-2

OUTPUT @Dmm;"RANGE 100"

CASE <=1.0E-1

OUTPUT @Dmm;"RANGE 1000"

CASE ELSE

Problem=1

!Use previous Rdg

!If Rdg<=10mV,

!IF 10mV<Rdg<=100mV,

!IF Rdg>100mV,

!Something is wrong

END SELECT

1110 END SELECT

1120 RETURN

1130 !

1140 Read_dmm:

1150 OUTPUT @Dmm;"TRIG SGL"

1160 ENTER @Dmm;Reading

1170 Reading=PROUND(Reading,-10)

1180 RETURN

!Get reading

1190 !

1200 END

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AC Flatness Adjustment Procedure - 250 kHz Filter

Description

This procedure adjusts the AC calibration constants for the 250 kHz filter.

The AC Flatness Test for the 250 kHz filter (see Chapter 2) is performed

with AC corrections disabled. The results are used to calculate new

calibration constants, which are then transferred to non-volatile memory.

Preliminary Procedure

Adjustment Procedure

• Perform a complete autocalibration on the DMM (unless an

autocal has been performed within the last 24 hours).

• Determine the calibration constants by performing Test 2-5 (see

Chapter 2), with the following modification: After resetting the

AFG (step 1), turn off AC corrections using the CAL:STAT:AC

OFF command.

1. Disable calibration security on the AFG:

CAL:SEC:STAT OFF, <security code>

Cal security off

where <code> is the AFG’s security code (factory-set to "E1445A").

2. Verify that the calibration constants determined in the Preliminary

Procedure are acceptable (see SUB Valid_cons in the example

program).

3. Transfer the calibration constants to the AFG in arbitrary block data

format:

CAL:DATA:AC1 <data >

Transfer cal constants

NOTE

See SUB Adj_flat in the example program to see how step 3 is performed in

Agilent BASIC.

Example Program

An example program that performs the AC flatness adjustment procedures

for both filters is listed following the AC flatness adjustment procedure for

the 10 MHz filter.

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AC Flatness Adjustment Procedure - 10 MHz Filter

Description

This procedure adjusts the AC calibration constants for the 10 MHz filter.

The AC Flatness Test for the 10 MHz filter (see Chapter 2) is performed

with AC corrections disabled. The results are used to calculate new

calibration constants, which are then transferred to non-volatile memory.

Preliminary Procedure

• Perform a complete autocalibration on the DMM (unless an

autocal has been performed within the last 24 hours).

• Follow the manufacturer’s instructions for calibrating the Power

Meter and correcting for the Power Sensor.

• Determine the calibration constants by performing Test 2-6 (see

Chapter 2), with the following modification: After resetting the

AFG (step 1), turn off AC corrections using the CAL:STAT:AC

OFF command.

Adjustment Procedure

1. Disable calibration security on the AFG:

CAL:SEC:STAT OFF, <security code>

Cal security off

where <security code> is the AFG’s security code (factory-set to

"E1445A").

2. Verify that the calibration constants determined in the Preliminary

Procedure are acceptable (see SUB Valid_cons in the example

program).

3. If the firmware revision is A.02.00 or higher (use the *IDN?

command to determine the firmware revision), transfer the two

constants (4 and 25000) that determine the frequencies to be

calibrated:

CAL:DATA:FILT <data>

NOTE

See SUB Load_magic_num in the example program to see how step 3 is

performed in Agilent BASIC.

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AC Flatness Adjustment Procedure - 10 MHz Filter (cont’d)

Adjustment Procedure

(cont’d)

NOTE

Rev A.02.00 (use the *IDN? command to determine the firmware revision)

allows the 10 MHz filter to be replaced with a filter that has a lower cutoff

frequency (the 10 MHz filter must be replaced at the factory). If the 10

MHz filter has been replaced, change the value for Max_freq in line 570 of

the example program to the new cutoff frequency. Changing Max_freq may

change the constants that are sent with the CAL:DATA:FILT command in step

3 (see SUB Load_magic_num).

4. Transfer the calibration constants to the AFG in arbitrary block data

format:

CAL:DATA:AC2 <data >

Transfer cal constants

NOTE

See SUB Adj_flat in the example program to see how step 4 is performed in

Agilent BASIC.

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AC Flatness Adjustment Procedure (cont’d)

Example Program

10! RE-STORE "AC_FLAT"

30 !This program performs the AC flatness adjustment procedure for

40 !the E1445A Arbitrary Function Generator. An 3458A DMM

50 !and an Agilent 8902A Measuring Receiver are required.

70 !To perform the flatness measurements without adjustments, change

80 !Mode$ to "M" below.

100 COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$[12]

110 COM /Flat/ INTEGER Num_points,Max_con

120 CLEAR SCREEN

130 !

140 !---------- Set up I/O paths ----------

150 ASSIGN @Afg TO 70910

160 ASSIGN @Dmm TO 722

170 ASSIGN @Pwr_mtr TO 714

180 Mode$="M"

!’M’ means measure, ’A’ means adjust

190 Secure_code$="E1445A"

200 !

!Calibration security code

210 CALL Flatness("250KHZ",Mode$)

220 CALL Flatness("10MHZ",Mode$)

230 !

240 !---------- QUIT ----------

250 !RESET INSTRUMENTS

260 OUTPUT @Afg;"*RST;*CLS"

270 OUTPUT @Pwr_mtr;"IP"

280 OUTPUT @Dmm;"RESET"

290 LOCAL @Dmm

300 LOCAL @Pwr_mtr

310 !

320 !CLOSE I/O PATHS

330 ASSIGN @Afg TO *

340 ASSIGN @Dmm TO *

350 ASSIGN @Pwr_mtr TO *

360 STOP

370 !

380 END

390 !

400 !******************** End Of Main Program ********************

410 !

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

420 Flatness:SUB Flatness(Filter$,Mode$)

430

440

450

460

470

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490

500

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540

550

560

570

580

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740

750

760

770

780

COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

INTEGER Filter,Ac_cal_int(1:2)

CLEAR SCREEN

!---------- Initialize variables ----------

Ampl_dbm=24

!AFG max amplitude

!---------- Main Program ----------

IF Filter$="250KHZ" THEN

Num_points=25

Max_freq=2.50E+5

ELSE

Num_points=27

Max_freq=1.08E+7

END IF

!Number of test points

!Else, 10M filter will be used

!Number of test points

PRINT "FILTER = "&Filter$

ALLOCATE Test_freq(1:Num_points),Results(1:Num_points)

!Determine test frequencies

Step_size=Max_freq/Num_points

FOR I=1 TO Num_points

Test_freq(I)=Step_size*I

NEXT I

GOSUB Setup_afg

CALL Meas_flat(Test_freq(*),Results(*),Filter$)

IF Mode$="A" THEN

CALL Adj_flat(Results(*),Filter$,Test_freq(Num_points))

END IF

DEALLOCATE Test_freq(*),Results(*)

SUBEXIT

790 Setup_afg:

800

810

820

OUTPUT @Afg;"*RST;*CLS"

WAIT .5

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

830

840

850

860

870

880

890

900

910

920

930

OUTPUT @Afg;"FUNC SIN;";

OUTPUT @Afg;":VOLT "&VAL$(Ampl_dbm)&"DBM;"; !Set amplitude

OUTPUT @Afg;":OUTP:LOAD 50 !50 ohm load

!Sine

OUTPUT @Afg;"CAL:STATE:AC "&VAL$(Mode$="M") !Turn AC corrections

!On if meas mode, or

!Off if adjust mode

OUTPUT @Afg;"OUTP:FILT:FREQ "&Filter$

OUTPUT @Afg;"OUTP:FILT ON"

OUTPUT @Afg;"INIT:IMM"

WAIT 1

!Set filter

RETURN

940 SUBEND

950 !

960 Meas_flat:SUB Meas_flat(Test_freq(*),Results(*),Filter$)

970

COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

980

COM /Flat/ INTEGER Num_points,Max_con

990

INTEGER Dmm_setup,Pm_setup

1000

1010

1020

1030

1040

1050

1060

1070

1080

1090

1100

1110

1120

1130

1140

1150

1160

1170

1180

1190

1200

1210

1220

1230

1240

1250

1260

!---------- Initialize variables ----------

Ref_freq=1000

Xover_freq=1.E+5

Dmm_setup=1

Pm_setup=1

!---------- Get ref readings ----------

!Reference frequency

!Crossover frequency

PRINTER IS CRT

!Get DMM reading at ref freq

OUTPUT @Afg;"FREQ "&VAL$(Ref_freq)

CALL Dmm_flat_rdg(Ref_freq,Dmm_ref,Dmm_setup)

PRINT "DMM REF READING =";Dmm_ref

!If 10MHZ filter, get DMM & PWR MTR readings at crossover freq

IF Filter$="10MHZ" THEN

OUTPUT @Afg;"FREQ "&VAL$(Xover_freq)

CALL Dmm_flat_rdg(Xover_freq,Dmm_xover,Dmm_setup)

PRINT "DMM XOVER READING =";Dmm_xover

CALL Pm_flat_rdg(Xover_freq,Pm_xover,Pm_setup)

Correct_factor=Dmm_xover/Pm_xover

PRINT "POWER METER XOVER READING =";Pm_xover

ELSE

Correct_factor=1

END IF

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

1270

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1290

1300

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1380

1390

1400

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Offset_factor=Dmm_ref

PRINT "CORRECTION FACTOR =";Correct_factor

PRINTER IS CRT

!---------- Perform measurements at test freqs ----------

PRINT " FREQ READING (V) ERROR (dBm)"

PRINT " ---- ----------- -----------"

FOR I=1 TO Num_points

!Set AFG to test freq

IF Test_freq(I)>1.073741824E+7 THEN

GOSUB Max_afg_freq

ELSE

OUTPUT @Afg;"FREQ "&VAL$(Test_freq(I))

END IF

!SCPI can’t do 10.8MHz

!so use register commands

!Get reading

IF Filter$="250KHZ" THEN

!If 250K filter,

CALL Dmm_flat_rdg(Test_freq(I),Reading,Dmm_setup)

ELSE !If 10M filter,

CALL Pm_flat_rdg(Test_freq(I),Reading,Pm_setup)

END IF

Flat_result=Reading*Correct_factor

!Convert to dBm error

Flat_error_dbm=PROUND((20*LGT(Flat_result)+13.0103)-(20*LGT(Offset_factor)+13.0103),-4)

Results(I)=Flat_error_dbm

Freq$=FNFormat_num$(Test_freq(I),1.E+5,9,"M6D","MD.2DESZ")

Result_v$=FNFormat_num$(Flat_result,1.E+3,9,"M2D.5D","MD.3DESZ")

Result_dbm$=FNFormat_num$(Flat_error_dbm,10,9,"M2D.5D","MD.3DESZ")

PRINT USING "9A,5X,9A,5X,9A";Freq$,Result_v$,Result_dbm$

NEXT I

!Adjust reading

!Store result in array

!End of loop

SUBEXIT

1670 Max_afg_freq: !Set AFG to 10.8MHz with register level commands

1680 OUTPUT @Afg;"FREQ MAX" !Get close with SCPI

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

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!Use register commands to get to 10.8MHz

OUTPUT @Afg;"DIAG:POKE #HE000A1,8,0"

OUTPUT @Afg;"DIAG:POKE #HE000A3,8,126"

OUTPUT @Afg;"DIAG:POKE #HE000A5,8,95"

OUTPUT @Afg;"DIAG:POKE #HE000A7,8,64"

OUTPUT @Afg;"DIAG:POKE #HE0008D,8,0"

WAIT .1

!PHASE_A1,0

!PHASE_A2,126

!PHASE_A3,95

!PHASE_A4,64

!LDSTBIND,0

RETURN

1770 SUBEND

1780 !

1790 Adj_flat:SUB Adj_flat(Results(*),Filter$,Max_freq)

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

INTEGER Cal_problem,Problem

Cal_problem=0

Scale_factor=1000

STATUS @Afg,3;Address

!Get path address

ALLOCATE INTEGER Ac_cal_cons(1:Num_points)

FOR I=1 TO Num_points

Ac_cal_cons(I)=Results(I)*Scale_factor

!Scale results array

NEXT I

CALL Valid_cons(Results(*),Cal_problem)

!Make sure constants are within range

!Transfer "magic numbers" if 10MHz filter

IF Filter$<>"250KHZ" THEN

Load_magic_num(Max_freq,Problem)

IF Problem THEN

PRINT "Problem occurred in Load_magic_num."

Cal_problem=1

END IF

IF NOT Cal_problem THEN

OUTPUT @Afg;"ABORT"

!Abort waveform

!Store cal constants into eeprom (format off)

OUTPUT @Afg;"CAL:SEC:STATE OFF,"&Secure_code$

ASSIGN @Afg TO Address;FORMAT OFF

IF Filter$="250KHZ" THEN

PRINT "Changed 250KHz Cal constants"

OUTPUT @Afg USING "#,K";"CAL:DATA:AC1 #0"

ELSE

PRINT "Changed 10MHz Cal constants"

OUTPUT @Afg USING "#,K";"CAL:DATA:AC2 #0"

END IF

!Enable cal

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

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OUTPUT @Afg;Ac_cal_cons(*)

OUTPUT @Afg USING "#,K";CHR$(10),END

ASSIGN @Afg TO Address

OUTPUT @Afg;"CAL:SEC:STATE ON"

PRINT "Flatness calibration constants stored to EEPROM"

ELSE

PRINT "Flatness calibration constants NOT stored to EEPROM"

END IF

!Load array

!LF,EOI

!Back to default attributes

!Disable cal

DISP "Press ’Continue’ when ready"

PAUSE

DISP

DEALLOCATE Ac_cal_cons(*)

2340 SUBEND

2350 !

2360 Dmm_flat_rdg:SUB Dmm_flat_rdg(Freq,Rdg,INTEGER Dmm_setup)

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

IF Dmm_setup THEN

!If true, set up DMM

!otherwise, skip setup

DISP "Connect DMM to AFG Output (with 50ohm termination), then press ’Continue’"

PAUSE

DISP

OUTPUT @Dmm;"PRESET NORM;FUNC ACV;SETACV SYNC;TRIG HOLD"

OUTPUT @Dmm;"RANGE 10;DELAY .1"

WAIT 1

Dmm_setup=0

END IF

!Clear flag so setup is only performed once

OUTPUT @Dmm;"ACBAND "&VAL$(Freq*.9)&","&VAL$(Freq*1.1)

WAIT .5

OUTPUT @Dmm;"TRIG SGL"

ENTER @Dmm;Rdg

2560 SUBEND

2570 !

2580 Pm_flat_rdg:SUB Pm_flat_rdg(Freq,Rdg,INTEGER Pm_setup)

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

IF Pm_setup THEN

!If true, then set up Power Meter

!otherwise skip setup

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

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DISP "Connect Power Meter to AFG Output, then press ’Continue’"

PAUSE

DISP

OUTPUT @Pwr_mtr;"IP"

OUTPUT @Pwr_mtr;"AU M4 WT"

WAIT .5

!Instrument preset

!Auto operation, RF power, watts

Pm_setup=0

!Clear flag so that setup

!is only performed once

END IF

OUTPUT @Pwr_mtr;VAL$(Freq/1.E+6)&"MHZ"

OUTPUT @Pwr_mtr;"T3"

ENTER @Pwr_mtr;Rdg

!Expected frequency

!Trigger Pwr Meter w/settling

!Get reading

Rdg=SQRT(ABS(Rdg)*50)

!Convert from watts to volts

2780 SUBEND

2790 !

2800 Read_dc_cal_con:SUB Read_dc_cal_con(Cal_real(*))

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

Max_con=25

ALLOCATE Scale(1:12),INTEGER Cal_reflect(1:Max_con)

IF SIZE(Cal_real,1)<Max_con THEN

PRINT "PASS PARAMETER NOT DIMENSIONED LARGE ENOUGH"

BEEP

END IF

!SET CAL CONSTANT SCALE FACTORS

DATA 7E6 ,7E6 ,1E7 ,1E7 ,1E6

M_plus,M_minus,M_adj,M_off,M_cust

DATA 1E6 ,1E6 ,1E10 , 1E6 , 1E4

Vpwr ,Vbuf ,M_sub, B_sum, dB ERROR

DATA 4 , 0

! P&N BASE

READ Scale(*)

OUTPUT @Afg;"CAL:SEC:STATE OFF,"&Secure_code$

!Read cal constants back

OUTPUT @Afg;"CAL:DATA?"

ENTER @Afg USING "4A,34(W)";Dummy$[1,4],Cal_reflect(*)

OUTPUT @Afg;"CAL:SEC:STATE ON"

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

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FOR I=1 TO Max_con

Cal_real(I)=Cal_reflect(I)

IF I=1 THEN Cal_real(I)=Cal_reflect(I)/Scale(1)

IF I=2 THEN Cal_real(I)=Cal_real(I)/Scale(11)

IF I=3 THEN Cal_real(I)=Cal_reflect(I)/Scale(2)

IF I=4 THEN Cal_real(I)=Cal_reflect(I)/Scale(3)

IF I=5 THEN Cal_real(I)=Cal_real(I)/Scale(11)

! M_plus

! P_base

! M_minus

! M_adj

! N_base

IF I>5 AND I<13 THEN Cal_real(I)=Cal_real(I)/Scale(10)

!Filter and

! ATTN gain errors

IF I=13 THEN Cal_real(I)=Cal_reflect(I)/Scale(4)

IF I=14 THEN Cal_real(I)=Cal_reflect(I)/Scale(5)

IF I=15 THEN Cal_real(I)=Cal_reflect(I)/Scale(6)

IF I=16 THEN Cal_real(I)=Cal_reflect(I)/Scale(6)

IF I=17 THEN Cal_real(I)=Cal_reflect(I)/Scale(7)

IF I=18 THEN Cal_real(I)=Cal_reflect(I)/Scale(8)

IF I=19 THEN Cal_real(I)=Cal_reflect(I)/Scale(9)

! M_off

! M_cust

! Vpwro

! Vpwri

! Vbuf

! M_sum

! B_sum

! Z_inc_0db (not scaled)

! Z_inc_14db (not scaled)

! Zout gain errors

IF I>21 THEN Cal_real(I)=Cal_real(I)/Scale(10)

NEXT I

DEALLOCATE Scale(*),Cal_reflect(*)

3300 SUBEND

3310 !

3320 Valid_cons:SUB Valid_cons(Results(*),INTEGER Cal_problem)

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

Max_con=25

Cal_problem=0

ALLOCATE Cal_real(1:Max_con)

CALL Read_dc_cal_con(Cal_real(*))

!CHECK FOR VALID CAL

M_plus=Cal_real(1)

P_base=Cal_real(2)

M_minus=Cal_real(3)

M_adj=Cal_real(4)

N_base=Cal_real(5)

! key cal constant

! +base

! key cal constant

! -base

!Check that cal constants are reasonable--if not, use nominal values

IF (M_plus<-.005 OR M_plus>-.003) THEN M_plus=-3.834E-3

IF (M_minus<-.005 OR M_minus>-.003) THEN M_minus=-3.834E-3

IF (M_adj<-.0012 OR M_adj>-.0009) THEN M_adj=-.001021

IF (P_base<3180 OR P_base>3889) THEN P_base=3535

IF (N_base<10 OR N_base>245) THEN N_base=128

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

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!Check for valid cal

Max_filter_db=MAX(Cal_real(6),Cal_real(7),0)

Min_filter_db=MIN(Cal_real(6),Cal_real(7),0)

Max_attn_db=0

Min_attn_db=0

FOR I=8 TO 12

IF Cal_real(I)>0 THEN

Max_attn_db=Max_attn_db+Cal_real(I)

ELSE

Min_attn_db=Min_attn_db+Cal_real(I)

END IF

NEXT I

Max_zout_db=MAX(Cal_real(22),Cal_real(23),Cal_real(24),Cal_real(25),0)

Min_zout_db=MIN(Cal_real(22),Cal_real(23),Cal_real(24),Cal_real(25),0)

Max_pos_gain_db=-1*MAX(Results(*),0)-(Max_filter_db+Max_attn_db+Max_zout_db)-1.02

Min_pos_gain_db=-1*MIN(Results(*),0)-(Min_filter_db+Min_attn_db+Min_zout_db)-1.02

!Calculate P_inc’s and N_inc’s

Max_p_inc=10*(10^((Max_pos_gain_db)/20)-1)/M_plus

Min_p_inc=10*(10^((Min_pos_gain_db)/20)-1)/M_plus

Max_n_inc=(Max_p_inc*(M_plus-M_minus))/M_adj

Min_n_inc=(Min_p_inc*(M_plus-M_minus))/M_adj

Max_gain_dac=P_base+Max_p_inc

Min_gain_dac=P_base+Min_p_inc

Max_to_dac=N_base+Max_n_inc

Min_to_dac=N_base+Min_n_inc

3860 ! PRINT "GAIN DAC EXTREMES: MAX,MIN = "&VAL$(PROUND(Max_gain_dac,-1))&" ,

"&VAL$(PROUND(Min_gain_dac,-1))

3870 ! PRINT "TURNOVER DAC EXTREMES: MAX,MIN = "&VAL$(PROUND(Max_to_dac,-1))&" ,

"&VAL$(PROUND(Min_to_dac,-1))

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IF Max_gain_dac>4075 OR Min_gain_dac<20 THEN ! If out of range

Cal_problem=1

PRINT "GAIN DAC OUT OF RANGE"

! Set flag

END IF

IF Max_to_dac>247 OR Min_to_dac<8 THEN

! If out of range

! Don’t store constants

Cal_problem=1

PRINT "TURNOVER DAC OUT OF RANGE"

END IF

DEALLOCATE Cal_real(*)

4000 SUBEND

4010 !

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

4020 SUB Syst_err(Address)

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

DIM Message$[256]

REPEAT

OUTPUT Address;"SYST:ERR?"

ENTER Address;Code,Message$

PRINT Code,Message$

UNTIL NOT Code

4110 SUBEND

4120 !

4130 Load_magic_num:SUB Load_magic_num(Max_freq,OPTIONAL INTEGER Problem)

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

INTEGER Num_cal_points,N,Div

ALLOCATE Id$[50],INTEGER Block(1:2),Ac_int(1:2)

!Check firmware rev - if A.01.00 then exit

OUTPUT @Afg;"*IDN?"

ENTER @Afg;Id$

IF POS(Id$,"A.01.00") THEN SUBEXIT

STATUS @Afg,3;Address

!Get path address

IF NPAR>1 THEN Problem=0

Num_cal_points=27

Cal_step=Max_freq/Num_cal_points

!Step size

!Calculate N

N=INT(LGT(Cal_step/32768)/LGT(2))+1

N=MAX(N,1)

N=MIN(N,8)

!Calculate Div

Div=Cal_step/(2^N)

Div=MAX(Div,1)

Div=MIN(Div,32767)

IF Cal_step<>PROUND(((2^N)*Div),4) THEN

IF NPAR>1 THEN Problem=1

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

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ELSE

Block(1)=N

Block(2)=Div

OUTPUT @Afg;"CAL:SEC:STATE OFF,"&Secure_code$

ASSIGN @Afg TO Address;FORMAT OFF

OUTPUT @Afg USING "#,K";"CAL:DATA:FILTER #0"

OUTPUT @Afg;Block(*)

OUTPUT @Afg USING "#,K";CHR$(10),END

ASSIGN @Afg TO Address

OUTPUT @Afg;"CAL:SEC:STATE ON"

PRINT "MAGIC NUMBERS STORED: ";N,Div

END IF

!Enable cal

!Back to default attributes

!Disable cal

4590 SUBEND

4600 !

4610 Read_ac_cal_int:SUB Read_ac_cal_int(INTEGER Ac_cal_int(*))

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

ALLOCATE Id$[50]

OUTPUT @Afg;"*IDN?"

ENTER @Afg;Id$

IF POS(Id$,"A.01.00") THEN

Ac_cal_int(1)=4

Ac_cal_int(2)=25000

SUBEXIT

END IF

Max_con=2

4780 ! IF SIZE(Ac_cal_int,1)<>Max_con OR RANK(Ac_cal_int)<>1 THEN

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STATUS @Afg,3;Address

OUTPUT @Afg;"CAL:SEC:STATE OFF,"&Secure_code$

OUTPUT @Afg;"CAL:DATA:FILTER?"

ASSIGN @Afg TO Address;FORMAT OFF

ENTER @Afg USING "3A,2(W)";Dummy$[1,3],Ac_cal_int(*)

ASSIGN @Afg TO Address

OUTPUT @Afg;"CAL:SEC:STATE ON"

PRINT Ac_cal_int(*)

4900 SUBEND

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

4910

4920 SUB Security_code

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

CLEAR SCREEN

OUTPUT @Afg;"*RST;*CLS"

Valid=0

REPEAT

Secure_code$="E1445A"

INPUT "Enter your security code <default is ’E1445A’>",Secure_code$

Secure_code$=TRIM$(Secure_code$)

Check_sec_code(Valid)

UNTIL Valid

5050 SUBEND

5060 !

5070 !

5080 SUB Check_sec_code(Valid)

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COM @Afg,@Dmm,@Pwr_mtr,@Analyzer,Secure_code$

COM /Flat/ INTEGER Num_points,Max_con

DIM Message$[255]

Valid=0

CLEAR SCREEN

DISP "Verifying security code..."

WAIT 1

OUTPUT @Afg;"CAL:SEC:STAT OFF,"&Secure_code$

OUTPUT @Afg;"SYST:ERR?"

ENTER @Afg;Code,Message$

DISP

IF Code<>0 THEN

BEEP 1000,.1

PRINT "Invalid security code -- try again"

OUTPUT @Afg;"*RST;*CLS"

DISP "Press ’Continue’"

PAUSE

SUBEXIT

ELSE

Valid=1

PRINT "Security code accepted"

WAIT 1

OUTPUT @Afg;"*RST;*CLS"

END IF

CLEAR SCREEN

5350 SUBEND

5360 !

5370 !

(Continued on next page)

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AC Flatness Adjustment Procedure (cont’d)

Example Program (cont’d)

5380 Format_num:DEF FNFormat_num$(Value,Not_exp_max,INTEGER Length,Not_exp_img$,Exp_img$)

5390 INTEGER Diff

5400 SELECT ABS(Value)

5410 CASE <1.E-9,>=1.E+10

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IF NOT POS(Exp_img$,"ZZ") THEN

OUTPUT String$ USING Exp_img$&"Z,#";Value

ELSE

OUTPUT String$ USING Exp_img$&",#";Value

END IF

5470 CASE <1.E-4,>=Not_exp_max

5480 OUTPUT String$ USING Exp_img$&",#";Value

5490 CASE ELSE

5500

OUTPUT String$ USING Not_exp_img$&",#";Value

5510 END SELECT

5520

5530 Diff=Length-LEN(String$)

5540 IF Diff>0 THEN String$=RPT$(" ",Diff)&String$

5550 RETURN String$

5560 FNEND

5570 !

5580 !

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Skew DAC Adjustment Procedure

Description

This procedure compensates for time delays between the AFG’s two DACs.

The skew setting which produces the lowest second harmonic amplitude is

found and loaded into non-volatile memory.

Equipment Setup

• Connect the equipment as shown in Figure 3-3

• Set up the Spectrum Analyzer:

Center Frequency = 8 MHz

Frequency Span = 3.2 kHz

Figure 3-3. Skew DAC Adjustment Setup

Adjustment Procedure

1. Reset the AFG:

*RST

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Skew DAC Adjustment Procedure (cont’d)

Adjustment Procedure (cont’d)

2. Set up the AFG to output an 11 dBm, 4 MHz sinewave:

FUNC SIN;

:VOLT 11 DBM;

:FREQ 4E6

INIT:IMM

3. Load an initial value of 128 into the delay DAC:

DIAG:POKE #HE0000B,8,2

DIAG:POKE #HE0000D,8,128

DIAG:POKE #HE0000B,8,7

DIAG:POKE #HE0000D,8,8

4. With the Spectrum Analyzer, locate and center the second harmonic.

Then, reduce the frequency span to 2 kHz.

5. Find the delay DAC setting that minimizes the amplitude of the

second harmonic (see the example program).

6. Disable calibration security on the AFG:

CAL:SEC:STAT OFF, <security code>

Cal security off

where <code> is the AFG’s security code (factory-set to "E1445A").

7. Transfer the calibration constant (DAC setting) to the AFG in

arbitrary block data format:

CAL:DATA:SKEW <data >

Transfer cal constant

NOTE

See the example program to see how step 7 is performed in BASIC.

8. Enable calibration security on the AFG:

CAL:SEC:STAT ON

Cal security on

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Skew DAC Adjustment Procedure (cont’d)

Example Program

10 ! RE-STORE "SKEW_CAL"

20 COM @Afg,@Analyzer,Secure_code$[20]

30 INTEGER Dac_bits,Dac_word,Min_word,Max_word,Step_size,Harmonic

40 INTEGER Loc_min,Cal_word,Search_loop,Max_search_loop,Filter,Skew_con

50 DIM Id$[50]

70 !---------- Assign I/O paths ----------

80 ASSIGN @Afg TO 70910

90 ASSIGN @Analyzer TO 718

100 !

110 !---------- Check firmware rev ----------

120 !Rev A.01.00 does not support this cal procedure

130 OUTPUT @Afg;"*IDN?"

140 ENTER @Afg;Id$

150 !

160 IF POS(Id$,"A.01.00") THEN

170

180

PRINT "This rev does not support skew DAC calibration."

STOP

190 END IF

200 !

210 !---------- Initialize variables ----------

220 Secure_code$="E1445A"

230 Harmonic=2

!AFG security code

!Harmonic to be minimized

!No filter

240 Filter=0

250 Freq=4.E+6

!AFG frequency (Hz)

!AFG amplitude (dBm)

!Initial Spec Analyzer span

!Span used for measurements

260 Amp_in_dbm=11

270 Search_span$=VAL$(Freq*Harmonic*4.00E-4)

280 Test_span$="2000"

290 !

300 Dac_bits=8

310 Start_step_size=16

320 Step_size=Start_step_size

330 Max_search_loop=4

340 Dac_word=2^(Dac_bits-1)

350 Max_word=2^(Dac_bits)

360 Min_word=0

!Initial Dac_word

!Initial max

!Initial min

370 !

380 !---------- Test connections ----------

390 PRINT "Connect Spectrum Analyzer to AFG Ouput."

400 DISP "Press ’Continue’ when ready"

410 PAUSE

420 CLEAR SCREEN

430 !

(Continued on next page)

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Adjustments 111

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Skew DAC Adjustment Procedure (cont’d)

Example Program (cont’d)

440 !---------- Perform cal ----------

450 OUTPUT @Afg;"*RST;*CLS;*OPC?"

460 ENTER @Afg;Result

470 !

!Reset AFG

480 !Set up Spec Analyzer

490 Setup_spec(VAL$(Amp_in_dbm-2)&"DM",VAL$(Freq*Harmonic),Search_span$)

500 !

510 !Set up AFG

520 OUTPUT @Afg;"FUNC SIN;";

530 OUTPUT @Afg;":VOLT "&VAL$(Amp_in_dbm)&"DBM;";

540 OUTPUT @Afg;":FREQ "&VAL$(Freq)

550 OUTPUT @Afg;"INIT:IMM"

560 Load_delay_dac(Dac_word)

570 !

!Load constant into register

580 !Capture and center 2nd harmonic

590 Get_2nd_harm(Test_span$)

600 !

610 !Begin cal search loop

620 Search_loop=1

630 REPEAT

640

650

660

670

680

690

700

710

720

730

740

750

760

770

780

790

800

810

820

830

840

850

860

870

880

ALLOCATE INTEGER Word_array(0:((Max_word-Min_word)/Step_size))

ALLOCATE REAL Meas_array(0:((Max_word-Min_word)/Step_size))

Array_counter=0

PRINT "LOOP =";Search_loop

PRINT "CONSTANT"," READING"

PRINT "--------"," -------"

!Find constant that produces minimum 2nd harmonic

FOR I=Min_word TO Max_word STEP Step_size

IF I=256 THEN

Dac_word=255

ELSE

Dac_word=I

END IF

Load_delay_dac(Dac_word)

!Load constant into register

Word_array(Array_counter)=Dac_word

!Measure 2nd_harmonic, store in array

Meas_2nd_harm(Meas_array(Array_counter))

PRINT Word_array(Array_counter),DROUND(Meas_array(Array_counter),8)

Array_counter=Array_counter+1

NEXT I

(Continued on next page)

112 Adjustments

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Skew DAC Adjustment Procedure (cont’d)

Example Program (cont’d)

890

900

910

920

930

940

950

960

970

980

990

1000

!Set variables for next loop

MAT SEARCH Meas_array,LOC MIN;Loc_min

Cal_word=Word_array(Loc_min)

Min_word=Word_array(MAX(0,Loc_min-1))

Max_word=Word_array(MIN((SIZE(Word_array,1)-1),Loc_min+1))

Step_size=Step_size/INT(SQRT(Start_step_size)+.5) !Reduce step size

!Get location of min rdg

DEALLOCATE Meas_array(*),Word_array(*)

Search_loop=Search_loop+1

1010 UNTIL Step_size<1

1020 !

1030 PRINT "CAL CONSTANT =";Cal_word

1040 PRINT

1050 Wrt_skew_con(Cal_word)

1060 !

!Write word to eeprom

1070 !---------- Quit ----------

1080 OUTPUT @Afg;"*RST;*CLS"

1090 ASSIGN @Afg TO *

1100 ASSIGN @Analyzer TO *

1110 STOP

1120 END

1130 !

1140 Load_delay_dac:SUB Load_delay_dac(INTEGER Delay_dac)

1150

1160

1170

1180

1190

1200

1210

1220

1230

1240

1250

COM @Afg,@Analyzer,Secure_code$

INTEGER Lower_8,Benign_chn1

Benign_chn1=1

Lower_8=BINAND(Delay_dac,255)

OUTPUT @Afg;"DIAG:POKE #HE0000B,8,2"

OUTPUT @Afg;"DIAG:POKE #HE0000D,8,"&VAL$(Lower_8)

OUTPUT @Afg;"DIAG:POKE #HE0000B,8,7"

OUTPUT @Afg;"DIAG:POKE #HE0000D,8,"&VAL$(Benign_chn1+7)

WAIT .1

1260 SUBEND

1270 !

(Continued on next page)

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Skew DAC Adjustment Procedure (cont’d)

Example Program (cont’d)

1280 Wrt_skew_con:SUB Wrt_skew_con(INTEGER Cal_word)

1290

1300

1310

1320

1330

1340

1350

1360

1370

1380

1390

1400

1410

1420

1430

1440

1450

1460

1470

1480

1490

1500

1510

COM @Afg,@Analyzer,Secure_code$

DIM Id$[50]

!Check firmware rev

OUTPUT @Afg;"*IDN?"

ENTER @Afg;Id$

IF POS(Id$,"A.01.00") THEN

PRINT "This rev does not support skew DAC calibration."

CALL Abort_error

END IF

STATUS @Afg,3;Address

!Get path address

OUTPUT @Afg;"CAL:SEC:STAT OFF,"&Secure_code$

ASSIGN @Afg TO Address;FORMAT OFF

OUTPUT @Afg USING "#,K";"CAL:DATA:SKEW #0"

OUTPUT @Afg;Cal_word

OUTPUT @Afg USING "#,K";CHR$(10),END

ASSIGN @Afg TO Address

OUTPUT @Afg;"CAL:SEC:STAT ON"

PRINT "Skew constant written to AFG."

1520 SUBEND

1530 !

1540 Setup_spec:SUB Setup_spec(Amp_in_dbm$,Center$,Span$)

1550

1560

1570

1580

1590

COM @Afg,@Analyzer,Secure_code$

OUTPUT @Analyzer;"IP;RB 100HZ;VB 100HZ"

OUTPUT @Analyzer;"RL "&Amp_in_dbm$

OUTPUT @Analyzer;"SP "&Span$&"HZ"

OUTPUT @Analyzer;"CF "&Center$

!Preset, set res & vid BW

!Set ref level

!Set freq span

!Set center frequency

1600 SUBEND

1610

1620 Get_2nd_harm:SUB Get_2nd_harm(Test_span$)

1630

1640

1650

1660

COM @Afg,@Analyzer,Secure_code$

OUTPUT @Analyzer;"S2;TS;E1"

OUTPUT @Analyzer;"MKCF"

!Peak search

!Center freq to marker

!Narrow span

OUTPUT @Analyzer;"SP "&Test_span$&"HZ"

1670 SUBEND

1680 !

(Continued on next page)

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Skew DAC Adjustment Procedure (cont’d)

Example Program (cont’d)

1690 Meas_2nd_harm:SUB Meas_2nd_harm(Reading)

1700

1710

1720

1730

COM @Afg,@Analyzer,Secure_code$

OUTPUT @Analyzer;"TS;E1"

OUTPUT @Analyzer;"MA"

!Find peak

!Measure amplitude

ENTER @Analyzer;Reading

1740 SUBEND

1750 !

1760 Read_skew_con:SUB Read_skew_con(INTEGER Skew_cal_con)

1770

1780

1790

1800

1810

1820

1830

1840

1850

1860

1870

1880

1890

1900

1910

1920

1930

1940

COM @Afg,@Analyzer,Secure_code$

ALLOCATE Id$[50]

OUTPUT @Afg;"*IDN?"

ENTER @Afg;Id$

IF POS(Id$,"A.01.00") THEN

Skew_cal_con=128

SUBEXIT

END IF

STATUS @Afg,3;Address

OUTPUT @Afg;"CAL:SEC:STAT OFF,"&Secure_code$

OUTPUT @Afg;"CAL:DATA:SKEW?"

ASSIGN @Afg TO Address;FORMAT OFF

ENTER @Afg USING "3A,1(W)";Dummy$[1,3],Skew_cal_con

ASSIGN @Afg TO Address

OUTPUT @Afg;"CAL:SEC:STAT ON"

1950 SUBEND

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Chapter 4

Replaceable Parts

Introduction

This chapter contains information for ordering replaceable parts for the

Agilent E1445A AFG.

Exchange Table 4-1 lists assemblies that may be replaced on an exchange basis

(NEW/EXCHANGE ASSEMBLIES). Exchange assemblies are available

Assemblies

only on a trade-in basis. Defective assemblies must be returned for credit.

Assemblies required for spare parts stock must be ordered by the new

assembly part number.

Ordering To order a part listed in Table 4-1, specify the Agilent part number and the

quantity required. Send the order to your nearest Agilent Technologies

Sales and Support Office.

Information

Replaceable

Parts List

Table 4-1 lists the user-replaceable parts for the Agilent E1445A AFG. See

Figure 4-1 for locations of user-replaceable parts. Table 4-2 lists the

reference designators for the AFG. Table 4-3 is the code list of

manufacturers.

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Table 4-1. Agilent E1445A Replaceable Parts

Qty Part Description

Reference

Designator

Part

Number

Mfr.

Code

Mfr. Part

Number

NEW/EXCHANGE ASSEMBLIES

ME1445A

E1445-66201

E1445A (NEW)

E1445A (EXCHANGE)

28480

ME1445A

E1445-66201

MECHANICAL PARTS

HDL1

HDL2

E1400-45102*

E1400-45101*

HANDLE-BOTTOM METAL INJECTION MOLDING

HANDLE-TOP METAL INJECTION MOLDING

28480

E1400-45102*

E1400-45101*

HDW010

HDW011

HDW11-HDW15 2950-0054

HDW17-HDW21 3050-0604

0380-1858

2190-0004

STANDOFF-HEX .312-IN-LG 4-40-THD

WASHER-LK INTL T NO. 4 .115-IN-ID

NUT-HEX-DBL-CHAM 1/2-28-THD .125-IN-THK

WASHER- 7/16 IN .5-IN-ID .75-IN-OD

05791

78189

28480

86928

ST9532-36

SF 1904-00

2950-0054

5710-94-16

MP1

MP2-MP5

8160-0686

E1450-01202

CLIP-RFI STRIP-FINGERS BE-CU SN-PL

EMI STRIP

30817

28480

00786-185

E1400-01202

PNL1

E1445-00202*

FRONT PANEL

28480

E1445-00202*

28480

SCR1-SCR8

SCR10

SCR13-SCR14

SCR17

0515-1135

E1400-00610*

0515-0430

SCREW- MACHINE M3 X 0.5 25MM-LG -HD

SHOULDER SCREW ASSEMBLY

0515-1135

E1400-00610*

0515-0430

SCREW- MACHINE M3 X 0.5 6MM-LG PAN-HD

SHD1

SHD2

SHD3

E1445-00601

E1445-00602*

E1445-00603

TOP SHIELD

BOTTOM SHIELD

FLEX SHIELD

28480

E1445-00601

E1445-00602*

E1445-00603

A1 PRINTED CIRCUIT ASSEMBLY

28480

72619

E1445-63501

PCA- DAC MAIN

E1445-63501

553-0302

553-0321

553-0302

553-0301

CR610-CR613 1990-1448

LED-LAMP ARRAY LUM-INT=1.5MCD, GREEN LENS

LED-LAMP ARRAY LUM-INT=300UCD, RED-GREEN LENS

LED-LAMP ARRAY LUM-INT=1.5MCD, GREEN LENS

LED-LAMP LUM-INT=800UCD IF=20MA-MAX, RED LENS

CR614

CR615

CR616

1990-1364

1990-1448

1990-1507

F301-F305

2110-0699

FUSE-SUBMINIATURE 5A 125V NTD AX UL CSA

75915

R251005T1

J2-J3

J101-J104

J105

J106

J110-J113

1251-5150

1252-4568

1252-1201

1252-4568

1250-2012

CONNECTOR-POST TYPE .100-PIN-SPCG 12-CONTACT

CONNECTOR-POST TYPE .100-PIN-SPCG 3-CONTACT

CONNECTOR-RECT D-SUBMINIATURE 25-CONTACT

CONNECTOR-POST TYPE .100-PIN-SPCG 3-CONTACT

CONNECTOR-RF BNC FEM PC-W-STDFS 50-OHM

18873

00779

18873

00779

67996-612

89602-603

748877-1

89602-603

227676-1

JM1-JM7

1258-0209

JUMPER-REMOVABLE 2 POSITION; .250 IN

SWITCH-DIP ROCKER 8-1A 0.05A 30VDC

A2 PRINTED CIRCUIT ASSEMBLY

00779

81073

531220-2

SP301-SP302 3101-2243

76YY22318S

J901

E1445-63502

1250-2012

PCA- DAC ANALOG

CONNECTOR-RF BNC FEM PC-W-STDFS 50-OHM

28480

00779

E1445-63502

227676-1

A3 PRINTED CIRCUIT ASSEMBLY

U501

U502

E1445-63503

1813-0879

1813-0831

PCA- DIG TIMER

CLOCK-OSCILLATOR-XTAL 40.0-MHZ 0.005%

CLOCK-OSCILLATOR-XTAL 42.949672-MHZ

28480

E1445-63503

1813-0879

1813-0831

* These parts are not compatible with older versions of the E1445A that have plastic handles. To replace one of these parts on an older

E1445A, you must order all five of the parts marked with a *.

118 Replaceable Parts

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Table 4-2. Agilent E1445A Reference Designators

E1445A Reference Designators

A ........................................... assembly MP ............................... mechanical part

CR ................................................ diode PNL .............................................. panel

HDL ............................................ handle SCR ............................................ screw

HDW ..................................... hardware SHD ............................................ shield

J .................. electrical connector (jack) SP .............................................. switch

JM ............................................. jumper U ................................ integrated circuit

F.......................................................fuse

Table 4-3. Agilent E1445A Code List of Manufacturers

Mfr.

Code

Manufacturer’s

Name

Manufacturer’s

Address

Zip

Code

00779

05791

18873

28480

30817

72619

75915

78189

AMP INC

LYN-TRON INC

DUPONT E.I. DE NUMOURS & CO

AGILENT TECHNOLOGIES

INSTRUMENT SPECIALTIES INC

DIALIGHT CORP

HARRISBURG, PA US

BURBANK, CA US

WILMINGTON, DE US

17111

91505

19801

DEL WATER GAP, PA US

BROOKLYN, NY US

DES PLAINES, IL US

ELGIN, IL US

18327

11237

60016

60126

LITTELFUSE INC

ILLINOIS TOOL WORKS INC

SHAKEPROOF

81073

83486

86928

GRAYHILL INC

ELCO INDUSTRIES INC

SEASTROM MFG CO

LA GRANGE, IL US

ROCKFORD, IL US

GLENDALE, CA US

60525

61125

91201

Agilent E1445A Service Manual

Replaceable Parts 119

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Figure 4-1. E1445A Replaceable Parts

120 Replaceable Parts

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Chapter 5

Service

Introduction

This chapter contains service information for the Agilent E1445A AFG,

including troubleshooting guidelines and repair/maintenance guidelines.

WARNING

Do not perform any of the service procedures shown unless

you are a qualified, service-trained technician, and have read

the WARNINGS and CAUTIONS in Chapter 1.

Equipment Equipment required for AFG troubleshooting and repair is listed in Table

1-1, Recommended Test Equipment. Any equipment that satisfies the

Required

requirements given in the table may be substituted. To avoid damage to the

screw head slots, use T8 and T10 Torx drivers as described in the

disassembly instructions later in this chapter.

Service Aids See Chapter 4 for descriptions and locations of Agilent E1445A replaceable

parts. Service notes, manual updates, and service literature for the AFG

may be available through Agilent. For information, contact your nearest

Agilent Sales and Support Office.

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Troubleshooting To troubleshoot an Agilent E1445A problem, you should first identify the

problem, and then isolate the cause to a user-replaceable part.

Techniques

Identifying AFG problems can be divided into three general categories:

the Problem

• Operator errors

• Catastrophic failures

• Performance out of specification

Operator Errors

Apparent failures may result from operator errors. See Appendix B in the

Agilent E1445A User’s Manual for information on operator errors.

Catastrophic Failure

If a catastrophic failure occurs, see "Testing the Assembly" to troubleshoot

the AFG.

Performance Out of Specification

If the AFG fails any of its Performance Tests, perform the adjustments

described in Chapter 3, then repeat the Performance Tests.

Testing the You can use the tests and checks in Table 5-1 to isolate the problem. See

Figure 4-1 in Chapter 4 for locations of user-replaceable parts.

Assembly

Table 5-1. Agilent E1445A Tests/Checks

Test/Check

Reference Designator

Check:

Heat Damage

- - - - - - - - - -

Discolored PC boards

Damaged insulation

Evidence of arcing

AFG/Jumper

Settings

A1BG0 - A1BG3

A1SP301

Bus Request level

setting

A1SP302

LADDR setting

Servant Area setting

AFG PCAs

A1F301 - A1F305

Fuse continuity

Damaged connectors

122 Service

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Checking for Heat Damage

Inspect the AFG for signs of abnormal internally generated heat such as

discolored printed circuit boards or components, damaged insulation, or

evidence of arcing. If there is damage, do not operate the AFG until you

have corrected the problem.

Checking Switches/Jumpers

Verify that the logical address setting is set correctly (factory set at 80).

Verify that the bus request level and servant area settings are correct. See

the Agilent E1445A User’s Manual for information.

Checking the AFG PCAs

Check fuse continuity and inspect all connectors for bent pins or damaged

contacts.

Disassembly Use the following procedure to disassemble the AFG (see Figure 5-1):

1. Remove the nine T10 Torx screws on the right side panel.

2. Remove the front panel handles using a T-8 TORX driver.

3. Remove the hex standoffs and washers from the front panel digital

port connector.

4. Remove the nuts and washers from the front panel BNC’s.

Figure 5-1. E1445A Disassembly

Agilent E1445A Service Manual

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Removing BNC Use the following steps to remove the AFG front panel BNC connectors

(refer to Figure 5-2):

Connectors

1. Unsolder wires

2. Remove the two T8 torx screws

3. Remove the BNC connector

4. Reverse the order to reinstall the connector

Figure 5-2. Removal of BNC Connectors

124 Service

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Repair/

Maintenance

Guidelines

This section provides guidelines for repairing and maintaining the Agilent

E1445A AFG, including:

• ESD precautions

• Soldering printed circuit boards

• Post-repair safety checks

ESD Electrostatic discharge (ESD) may damage static sensitive devices in the

Agilent E1445A AFG. This damage can range from slight parameter

degradation to catastrophic failure. When handling AFG assemblies, follow

these guidelines to avoid damaging AFG components:

Precautions

• Always use a static-free work station with a pad of conductive rubber

or similar material when handling AFG components.

• If a device requires soldering, be sure the assembly is placed on a

pad of conductive material. Also, be sure that you, the pad, and the

soldering iron tip are grounded to the assembly.

Soldering Printed When soldering to any circuit board, keep in mind the following guidelines:

Circuit Boards

• Avoid unnecessary component unsoldering and soldering. Excessive

replacement can result in damage to the circuit board and/or adjacent

components.

• Do not use a high power soldering iron on etched circuit boards, as

excessive heat may lift a conductor or damage the board.

• Use a suction device or wooden toothpick to remove solder from

component mounting holes. When using a suction device, be sure

that the equipment is properly grounded.

Post-Repair After making repairs to the Agilent E1445A AFG, inspect the AFG for any

signs of abnormal internally generated heat, such as discolored printed

Safety Checks

circuit boards or components, damaged insulation, or evidence of arcing.

Determine and correct the cause of the condition. Then perform the

Self-Test described in Chapter 2 to verify that the AFG is functional.

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*E1445-90011*

E1445-90011

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