Agilent Technologies Switch U2751A User Manual

Agilent U2751A USB  
Modular Switch Matrix  
User’s and Service Guide  
Agilent Technologies  
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Safety Symbols  
The following symbols on the instrument and in the documentation  
indicate precautions which must be taken to maintain safe operation of  
the instrument.  
Direct current (DC)  
Off (supply)  
Alternating current (AC)  
On (supply)  
Both direct and alternating current  
Caution, risk of electric shock  
Three-phase alternating current  
Earth (ground) terminal  
Caution, risk of danger (refer to this  
manual for specific Warning or Caution  
information)  
Caution, hot surface  
Protective conductor terminal  
Out position of a bi-stable push control  
Frame or chassis terminal  
Equipotentiality  
In position of a bi-stable push control  
Measurements performed on circuits  
not directly connected to MAINS  
CAT I  
Equipment protected throughout by  
double insulation or reinforced  
insulation  
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General Safety Information  
• Do not operate the device around explosive gas, vapor, or dust.  
• Observe all markings on the device before establishing any  
connection.  
WARNING  
• The device is under CAT I measurement category, do not connect the  
25-pin connector to MAINS.  
CAT I:  
Maximum working voltage:  
Standalone 35 Vrms  
Modular (Used with U2781A) 180 Vrms  
Maximum transient voltage: 300 Vrms  
• Do not measure higher than the rated voltage (as marked on the  
device).  
• Do not operate the device with the cover removed or loosened.  
• Use only the power adapter provided by the manufacturer to avoid  
any unexpected hazards.  
Electrostatic discharge (ESD) can cause damage to the components in  
the instrument and accessories. The cables or wires should be  
connected to the plug-in connectors first and covered with the wire  
casing prior to plugging it into the output connector to prevent ESD  
from occurring.  
CAUTION  
If the device is used in a manner not specified by the manufacturer, the  
device protection may be impaired.  
Always use dry cloth to clean the device. Do not use ethyl alcohol or  
any other volatile liquid to clean the device.  
Do not permit any blockage of the ventilation holes of the device.  
IV  
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Environmental Conditions  
This instrument is designed for indoor use and in an area with low  
condensation. The table below shows the general environmental  
requirements for this instrument.  
Environmental conditions  
Operating temperature  
Operating humidity  
Requirements  
0 °C to 50 °C  
20% to 85% RH non-condensing  
–20 °C to 70 °C  
Storage temperature  
Storage humidity  
5% to 90% RH non-condensing  
The U2751A USB modular switch matrix complies with the following  
safety and EMC requirements.  
CAUTION  
IEC 61010-1:2001/EN61010-1:2001 (2nd Edition)  
Canada: CAN/CSA-C22.2 No. 61010-1-04  
USA: ANSI/UL 61010-1:2004  
IEC 61326-2002/EN 61326:1997+A1:1998+A2:2001+A3:2003  
Canada: ICES-001:2004  
Australia/New Zealand: AS/NZS CISPR11:2004  
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Regulatory Markings  
The CE mark is a registered trademark  
The C-tick mark is a registered  
trademark of the Spectrum  
of the European Community. This CE  
mark shows that the product complies  
with all the relevant European Legal  
Directives.  
Management Agency of Australia.  
This signifies compliance with  
the Australia EMC Framework  
regulations under the terms of the  
Radio Communication Act of 1992.  
ICES/NMB-001 indicates that this  
ISM device complies with the  
Canadian ICES-001.  
Cet appareil ISM est confomre a la  
norme NMB-001 du Canada.  
This instrument complies with the  
WEEE Directive (2002/96/EC)  
marking requirement. This affixed  
product label indicates that you must  
not discard this electrical/electronic  
product in domestic household waste.  
The CSA mark is a registered  
trademark of the Canadian Standards  
Association.  
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Waste Electrical and Electronic Equipment (WEEE) Directive  
2002/96/EC  
This instrument complies with the WEEE Directive (2002/96/EC) marking  
requirement. This affixed product label indicates that you must not discard  
this electrical/electronic product in domestic household waste.  
Product Category:  
With reference to the equipment types in the WEEE directive Annex 1, this  
instrument is classified as a “Monitoring and Control Instrument” product.  
The affixed product label is as shown below.  
Do not dispose in domestic household waste  
To return this unwanted instrument, contact your nearest Agilent  
Technologies, or visit:  
for more information.  
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In This Guide…  
1
Getting Started  
This chapter provides an overview of the U2751A USB modular switch  
matrix, which includes the product outlook, product dimensions, and  
product layout. This chapter also contains instructions on how to install  
and configure the U2751A.  
2
3
4
This chapter describes the operation and features that are offered by the  
U2751A, such as switch controls and relay usage monitoring.  
This chapter contains the characteristics and specifications of the  
U2751A.  
Service Information  
This chapter provides the guidelines for returning the U2751A to Agilent  
Technologies for servicing or for servicing it yourself. It also contains the  
list of replaceable parts.  
VIII  
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Declaration of Conformity (DoC)  
The Declaration of Conformity (DoC) for this instrument is  
available on the Web site. You can search the DoC by its  
product model or description.  
If you are unable to search for the respective DoC, please contact your  
local Agilent representative.  
NOTE  
X
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Contents  
List of Tables XV  
1
Getting Started  
5
6
D. Install the Agilent Measurement Manager 13  
E. Connect the Module to Your PC 15  
F. Verify Your Module Connection 20  
G. Launch Your Agilent Measurement Manager 21  
U2751A DSub Connector 23  
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Contents  
55-Pin Backplane Connector Pin Configuration 29  
2
Operation and Features 31  
Power Up 32  
Error Conditions 37  
3
4
Service Information 43  
Replaceable Parts 45  
Disassembly Instructions 46  
Reassembly Instructions 48  
Contacting Agilent Technologies 48  
XII  
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List of Figures  
Figure 1-5. 55-pin backplane connector pin configuration 29  
Figure 2-1. Switch matrix concept 33  
Figure 2-2. Panel view of the Agilent Measurement Manager 34  
Figure 2-3. Panel view of the relay cycle counter 36  
Figure 4-4. Defective relay(s) check 44  
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XIV  
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List of Tables  
Table 3-3. Electrical and mechanical specifications update per  
attached data sheet 41  
Table 3-1. Electrical and mechanical specifications update per  
attached data sheet (continued) 42  
Table 4-2. Part number and description of replaceable part 45  
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XVI  
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U2751A USB Modular Switch Matrix  
User’s and Service Guide  
1
Introduction  
Inspection and Maintenance  
5
8
Electrical Check  
Installation  
D. Install the Agilent Measurement Manager 13  
G. Launch Your Agilent Measurement Manager 21  
U2751A DSub Connector 23  
U2922A Terminal Block 24  
U2922A Terminal Block Installation 27  
55-Pin Backplane Connector Pin Configuration 29  
Chassis Installation 30  
Agilent Technologies  
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1
Getting Started  
Introduction  
The U2751A USB modular switch matrix offers a high  
quality, low cost switching solution for automated test. It can  
operate as a standalone or modular unit when used with the  
U2781A USB modular instrument chassis.  
The U2751A is a compact 48, two-wire modular switch  
matrix which is controlled remotely over a USB interface via  
the Agilent Measurement Manager software. The U2751A can  
also be programmed using the provided drivers or via SCPI  
commands.  
The U2751A has the following features.  
32 two-wire cross-points organized in a 4 rows by 8  
columns configuration  
any combination of rows and columns can be connected  
at a time. Multiple channels can be closed at the same  
time  
relay cycle counter  
The U2751A offers you the most flexible connection path  
between your device under test (DUT) and your test  
equipment, allowing different instruments to be connected to  
multiple points on your DUT at the same time.  
Using the Agilent Measurement Manager, you can instruct  
the matrix to make or break any of the 32 row-column  
intersections over the USB interface. More details will be  
covered in the Agilent Measurement Manager help file.  
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1
Product at a Glance  
Product Outlook  
Top View  
Bumpers  
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Front View  
USB indicator  
Power indicator  
DSub connector  
Rear View  
55-pin backplane connector  
USB inlet  
Fastening hole for USB cable with locking mechanism  
Power inlet  
4
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1
Product Dimensions  
Dimensions Without Bumpers  
Top View  
105.00 mm  
175.00 mm  
Front View  
25.00 mm  
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Dimensions With Bumpers  
Top View  
117.00 mm  
180.00 mm  
Front View  
41.00 mm  
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1
Standard Purchase Items  
Verify that you have received the following items with your  
unit. If anything is missing or damaged, please contact the  
nearest Agilent Sales Office.  
12 V, 2 A AC/DC adapter  
Power cord  
USB Standard-A to Mini-B interface cable  
L-Mount kit (used with the modular instrument chassis)  
Agilent Automation-Ready CD (contains the Agilent IO  
Libraries Suite)  
Agilent USB Modular Products Quick Start Guide  
Agilent USB Modular Products Reference CD-ROM  
Agilent Measurement Manager Quick Reference Card  
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Inspection and Maintenance  
Initial Inspection  
When you receive your U2751A, inspect the unit for any  
obvious damage such as broken terminals or cracks, dents,  
and scratches on the casing that may occur during shipment.  
If any damage is found, notify the nearest Agilent Sales  
Office immediately. The front of this manual contains the  
warranty information.  
Keep the original packaging in case the U2751A has to be  
returned to Agilent in the future. If you return the U2751A  
for service, attach a tag identifying the owner and model  
number. Also include a brief description of the problem.  
Electrical Check  
Chapter 4, “Service Information” on page 43 will provide the  
complete verification procedure. The procedure will verify to  
a high level of confidence that the U2751A is operating in  
accordance with its specifications.  
General Maintenance  
Any repair that is not covered in your modular product manuals should  
only be performed by qualified personnel.  
NOTE  
1 Power off your module and remove the power cord and  
I/O cable from your device.  
2 Remove your module from the bumper casing.  
3 Shake off any dirt that may have accumulated on the  
module.  
4 Wipe your module with a dry cloth and install the  
bumper back in place.  
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Getting Started  
1
Installation and Configuration  
Installation  
Follow the step-by-step instructions shown in the following  
flowchart to get started with the preparations and  
installations of your U2751A.  
You need to install the IVI-COM driver if you are going to use the U2751A  
with Agilent VEE Pro, LabVIEW, or Microsoft Visual Studio .  
NOTE  
®
®
F. Verify Your Module Connection  
G. Launch Your Agilent Measurement Manager  
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A. Check Your System  
Prior to any installation or configuration, please ensure that  
your PC meets the following minimum system requirements.  
Processor 1.6 GHz Pentium® IV or higher  
Operating system Windows® XP Professional or Home Edition  
(Service Pack 1 or later), or Windows® 2000 Professional  
(Service Pack 4 or later)  
Browser Microsoft® Internet Explorer 5.01 or higher  
Available RAM 512 MB or higher recommended  
Hard-disk space 1 GB  
Video Super VGA 800600 (1024768 recommended)  
Prerequisites Agilent IO Libraries Suite 14.2 or higher  
1
(version 15.0 recommended), Agilent T&M Toolkit Runtime  
2
version 2.1 , Agilent T&M Toolkit Redistributable Package 2.1  
2
2
patch , Microsoft® .NET Framework version 1.1 and 2.0  
1 Available on Agilent Automation-Ready CD.  
2 Bundled with Agilent Measurement Manager application software installer.  
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B. Install the IO Libraries Suite  
The IO Libraries Suite 14.2 or higher is available on the  
Agilent Automation-Ready CD that comes with the standard  
purchase of the U2751A.  
If you do not have the Agilent Automation-Ready CD, obtain the IO  
NOTE  
Disconnect any USB instruments or connectivity interface from your  
PC.  
1 Close all other applications on your PC, insert the Agilent  
Automation-Ready CD into your CD-ROM drive, and follow  
the instructions on your screen.  
2 If the IO Libraries Suite installation does not start  
automatically, go to Start > Run (on the Windows Start  
menu) and type <drive>:\autorun\auto.exe where  
<drive>is your CD-ROM drive location.  
3 If you obtain the IO Libraries Suite from the web, save  
the self-extracting zip file (*.exe) to any location on your  
hard disk.  
4 Double-click the installation file to launch the installation.  
5 Follow the instructions on your screen to proceed with  
the installation.  
6 After the installation has completed, you will see the IO  
Control icon on the Windows taskbar notification area as  
shown below.  
For detailed installation instructions, refer to the Agilent IO Libraries Suite  
NOTE  
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C. Install the Module Driver  
Please ensure that there are no instruments connected to the PC when  
installing the driver.  
NOTE  
1 Verify that your PC meets the minimum system  
requirements as stated in “A. Check Your System” on  
page 10.  
2 Insert the Product Reference CD-ROM into your CD-ROM  
drive.  
3 The installer will automatically launch the Agilent Modular  
Products Installation Menu. Click Hardware Driver to begin the  
installation.  
4 If the menu does not launch automatically, go to Start >  
Run (on the Windows Start menu) and type <drive>:\  
Driver\Hardware\setup_Hw.exe where <drive>is  
your CD-ROM drive location. Click OK to begin the  
installation.  
5 Follow the instructions on the screen and click Next to  
proceed.  
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6 Click Install to begin the installation. Follow the  
instructions on the screen to proceed with the  
installation.  
7 Click Finish when the installation has completed.  
D. Install the Agilent Measurement Manager  
1 If you have done “C. Install the Module Driver” on  
page 12, proceed to Step 2. If not, close all other  
applications on your PC and insert the Product Reference  
CD-ROM into your CD-ROM drive.  
2 Click Measurement Manager on the U2751A Installation Menu to  
begin the installation.  
3 If the installation menu does not appear after a few  
seconds, go to Start > Run and type <drive>:\  
Application\Modular Instruments Measurement  
Manager\setup.exe where <drive> is your CD-ROM  
drive location.  
4 Click OK to begin the installation.  
5 If you do not have any of the prerequisites installed, the  
InstallShield Wizard software prerequisite will appear.  
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Getting Started  
6 Click OK to begin the installation of the listed missing  
prerequisites.  
7 Once the above installation has completed, installation of  
the Measurement Manager software will proceed as  
normal.  
8 The Measurement Manager InstallShield Wizard dialog will  
appear. Click Next to begin.  
9 Read the License Agreement and select I accept the terms in  
the License Agreement to proceed. You may click Print to  
print a hardcopy of the Agilent License Terms for  
reference. Click Next to proceed.  
10 Fill in the Customer Information Form accordingly and  
click Next.  
11 Click Next to install to the specified folder or click Change  
to install to a different folder.  
12 Click Install to begin the installation of the Measurement  
Manager.  
13 Click Finish when the installation has completed.  
14 A shortcut to this software will be created on your  
desktop.  
USING THE LICENSED MATERIALS INDICATES YOUR ACCEPTANCE OF  
THE LICENSE TERMS. IF YOU DO NOT AGREE TO ALL OF THESE TERMS,  
YOU MAY RETURN ANY UNOPENED LICENSED MATERIAL FOR A FULL  
REFUND. IF THE LICENSED MATERIALS ARE BUNDLED OR PRELOADED  
WITH ANOTHER PRODUCT, YOU MAY RETURN THE ENTIRE UNUSED  
PRODUCT FOR A FULL REFUND.  
NOTE  
using  
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Getting Started  
1
E. Connect the Module to Your PC  
Ensure that the Agilent Measurement Manager is installed before  
proceeding.  
NOTE  
1 After the installations have completed, connect the power  
cord to the AC/DC power adapter. The AC/DC power  
adapter requirements are 100 to 240 VAC, 50/60 Hz, with  
an output voltage of +12 VDC.  
2 Insert the DC output plug from the AC/DC power adapter  
to the power jack on the rear panel of the U2751A.  
3 Connect the U2751A to any USB port on your PC with  
the bundled USB cable.  
4 Your PC will automatically detect the connected unit and  
the Found New Hardware Wizard window will appear. Select  
Yes, this time only and click Next to proceed.  
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Getting Started  
5 Select Install the software automatically (Recommended) and  
click Next.  
6 A warning message will appear on the Hardware Installation  
window. Click Continue Anyway to proceed with the  
installation of the U2751A.  
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1
If you do not wish to receive similar warning messages in the future,  
follow the instructions below.  
NOTE  
Go to Start > Control Panel and double-click System.  
Select the Hardware tab and click Driver Signing on the Drivers panel.  
The Driver Signing Options dialog box will appear.  
Select Ignore to disable the warning message.  
7 Click Finish to complete the installation.  
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Getting Started  
8 The Assign USB device alias window will appear. Each time  
the U2751A is plugged in, this dialog box will appear. To  
disable this dialog, select the Never show this dialog option  
in the Show this dialog panel and click OK.  
9 For modules other than the U2300A Series, U2500A  
Series, U2600A Series, and U2781A, the system will  
perform a firmware version check on your connected  
module.  
a If the module firmware version is the same as the  
installed version on the PC, it will not perform any  
firmware download and the U2751A is now ready for  
use.  
b If the module firmware version differs from the  
installed version on the PC, the following message box  
will appear. Firmware versions (V1.00 and V1.01) in the  
figure are for illustration purpose only, it might vary  
depending on the device and PC firmware version.  
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1
c Click Yes to begin the firmware download. The  
following message box will appear indicating the  
download in progress.  
Ensure that you do not remove the USB and power connection until the  
firmware download has completed.  
NOTE  
d Your U2751A is ready for use once the firmware  
download has completed.  
10 The U2751A can also be connected remotely to the PC  
through Agilent E5813A Networked 5-Port USB Hub.  
11 To connect through the E5813A, disconnect the U2751A  
from the PC while still powered on.  
12 Then connect the E5813A in power-on state to the PC and  
the U2751A.  
13 The U2751A is ready for use once the PC detects the  
connection.  
Connection through the E5813A Networked 5-Port USB Hub can only be  
established after the instrument is first connected directly to the PC.  
NOTE  
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1
Getting Started  
F. Verify Your Module Connection  
The Agilent Connection Expert is one of the utilities in the  
IO Libraries. The Connection Expert configures the  
connected instruments and enables communication. It is able  
to automatically detect the U2751A devices plugged into the  
PC.  
1 Go to Start > All Programs > Agilent IO Libraries Suite > Agilent  
Connection Expert to launch the Connection Expert.  
2 The detected U2751A will be visible on the Instrument I/O  
on this PC explorer pane. Right-click on the U2751A  
instrument on the explorer pane.  
3 A context menu will appear as shown below and select  
Send Commands To This Instrument.  
4 The Agilent Interactive IO dialog box will appear. Click Send &  
Read to send the *IDN? default command. The  
instrument’s response should appear in the Instrument  
Session History panel.  
20  
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1
5 If the Connection Expert can successfully communicate  
with the U2751A, this indicates that the instrument is  
installed correctly.  
G. Launch Your Agilent Measurement Manager  
The IO Control will launch automatically when you start your PC.  
NOTE  
Launching the Measurement Manager without the IO Control running  
will cause failure of the Measurement Manager to detect or establish  
any connection with the U2751A connected to your PC.  
To run the IO Control, go to Start > All Programs > Agilent IO  
Libraries Suite > Utilities > IO Control.  
1 Double-click the Measurement Manager software icon on  
your desktop or go to Start > All Programs > Agilent > Modular  
Products > Agilent Measurement Manager to launch the  
software.  
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Getting Started  
2 The Measurement Manager welcome screen will appear.  
3 The Select USB Device dialog box will appear displaying the  
connected U2751A devices. To start the application, select  
a U2751A device and click OK to establish the connection.  
For more information on how to use the Measurement Manager, refer to  
the Agilent Measurement Manager help file.  
NOTE  
22  
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1
U2751A DSub Connector  
The U2751A is equipped with one 25-pin male DSub  
connector as shown in Figure 1-1.  
Figure 1-1 25-pin male DSub connector  
Pin Assignments  
Table 1-1 Pin assignments  
Pin  
18  
19  
20  
21  
16  
17  
22  
23  
24  
25  
12  
13  
7
Description  
R1H  
R1L  
Pin  
10  
11  
8
Description  
C3H  
C3L  
R2H  
R2L  
C4H  
C4L  
9
R3H  
R3L  
5
C5H  
C5L  
6
R4H  
R4L  
3
C6H  
C6L  
4
C1H  
1
C7H  
C7L  
C1L  
2
C2H  
14  
15  
C8H  
C8L  
C2L  
GND  
R represents “Row” and C represents “Column”.  
H represents “High” and L represents “Low”.  
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U2922A Terminal Block  
The U2922A terminal block is an optional accessory to be  
used with the U2751A. The U2922A which weighs  
approximately 100 g and has screw-type terminals, offers you  
a convenient and simple way of making connection to the  
switch matrix for prototyping applications or an actual  
system deployment. It allows the user to configure a wide  
variety of routing options and matrix topologies.  
The U2922A pin configuration is in accordance to the 25-pin  
male DSub connector of the U2751A as shown in the  
following:  
R represents “Row” and C represents “Column”.  
H represents “High” and L represents “Low”.  
Figure 1-2 U2922A pin configuration  
You may also develop your own terminal block by using a  
compatible mating 25-pin female DSub connector to the front  
panel.  
Ensure that your design meets the clearance and creepage requirements  
for high voltage application as defined by IEC/EN 61010-1.  
NOTE  
24  
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Getting Started  
1
The outlook and dimensions of the U2922A are shown in  
Figure 1-3 and Figure 1-4.  
Female DSub connector  
Jack screw  
Retractable cover  
Terminal block  
Figure 1-3 U2922A outlook  
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Getting Started  
Rear View  
85.00 mm  
23.00 mm  
Top View  
90.00 mm  
105.00 mm  
Front View  
Side View  
85.00 mm  
105.00 mm  
23.00 mm  
23.00 mm  
Figure 1-4 U2922A dimensions  
26  
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Getting Started  
1
U2922A Terminal Block Installation  
This section provides the recommended procedure for  
connecting the U2922A terminal block to the U2751A.  
The maximum working voltage of the U2751A with the  
terminal block for standalone is 35 Vrms and for  
modular (when used with the U2781A) is 180 Vrms.  
WARNING  
The maximum transient voltage is 300 Vrms.  
Do not remove the retractable cover from the U2922A  
terminal block during operation to avoid any  
unexpected hazard.  
You are required to connect the cables to the U2922A terminal block  
prior to attaching the U2922A to the U2751A.  
NOTE  
Ensure that you power-off your device and unplug the U2922A from the  
U2751A to change the cable connection on the U2922A.  
Connect the cables to the terminal block as  
desired.  
cables  
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Getting Started  
Snap-fit clasp of the  
retractable cover and  
the housing  
Close your terminal block by slotting in the  
retractable cover. Check the snap-fit clasp on  
the cover and the housing to ensure correct  
orientation of the retractable cover before  
slotting it in.  
Turn over the U2922A with the retractable  
cover facing downwards. Then, insert the  
U2922A to the U2751A as shown.  
Tighten the jack screws using a screw driver  
to secure the connection. Ensure that the  
terminal block is installed correctly with the  
screws properly tighten for secure operation.  
Jack screws of the U2922A  
28  
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Getting Started  
1
55-Pin Backplane Connector Pin Configuration  
The 55-pin backplane connector is used when the U2751A  
module is inserted into the U2781A USB modular instrument  
chassis. For more details, refer to the Agilent U2781A USB  
Modular Instrument Chassis User's Guide.  
GND  
NC  
GND  
NC  
GND  
NC  
GND  
NC  
GND GND  
NC NC  
GND  
NC  
GND GND  
NC VBUS  
GND  
GND  
GND  
GND  
USB_D–  
USB_D+  
GND  
F
E
GND TRIG3  
TRIG4 GND  
GND  
TRIG5  
TRIG2  
GND  
GND TRIG1 GND TRIG0 GND  
D
C
B
A
TRIG6 GND TRIG7 GND +12 V +12 V  
nBPUB CLK10M GND STAR_TRIG GA2  
GA1  
NC  
6
GA0  
NC  
5
NC +12 V +12 V  
NC +12 V +12 V  
+12 V  
+12 V  
1
NC  
NC  
NC  
NC  
NC  
11  
10  
9
8
7
4
3
2
Figure 1-5 55-pin backplane connector pin configuration  
Table 1-2 Synchronous Simultaneous Interface (SSI) connector pin  
description  
SSI timing signal  
GND  
Functionality  
Ground  
NC  
Not connected  
VBUS  
USB bus power sensing input  
USB differential pair  
Trigger bus  
USB_D+, USB_D–  
TRIG0~TRIG7  
+12 V  
+12 V power with 4 A current  
USB backplane input detect  
10 MHz clock source  
Star trigger  
nBPUB  
CLK10M  
STAR_TRIG  
GA0,GA1,GA2  
Geographical address pin  
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1
Getting Started  
Chassis Installation  
The L-Mount kit is to be installed to your U2751A module.  
The following instructions describe the simple procedure of  
installing the L-Mount kit and your module in the U2781A  
chassis.  
1 Unpack the L-Mount kit from its packaging.  
2 Remove your U2751A module from the bumper casing.  
3 Using a Phillips screwdriver, fasten the L-Mount kit to  
your U2751A module.  
4 Insert your U2751A module into the U2781A chassis with  
the 55-pin backplane connector positioned at the bottom  
of the module.  
5 Once you have slotted the module into the chassis, tighten  
the screws of the L-Mount kit to secure the connection.  
30  
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U2751A USB Modular Switch Matrix  
User’s and Service Guide  
2
Power Up 32  
Switch Control 33  
Relay Cycle Counter 36  
System-Related Operation 37  
Self-Test 37  
Error Conditions 37  
SCPI Commands for System-Related Tasks 38  
This chapter describes the features and operation of the  
U2751A.  
Agilent Technologies  
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Operation and Features  
Power Up  
Take note of the following when you power up the U2751A.  
The U2751A can only be operated via the USB interface.  
Before you can control the U2751A, you need to install  
the hardware driver and the IO Libraries Suite 14.2 or  
higher. Both of these are included when you purchase the  
U2751A. Refer to Chapter 1, “B. Install the IO Libraries  
Suite” on page 11 and “C. Install the Module Driver” on  
page 12 for the installation procedure.  
On the front panel of the U2751A, there are two LED  
indicators. Refer to Chapter 1, “Product Outlook” on  
page 3.  
Power indicator lights up once the U2751A is powered up.  
USB indicator will only blink when there is data exchange  
activity between the U2751A and the PC.  
32  
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Operation and Features  
2
Switch Control  
A matrix switch connects multiple inputs to multiple  
outputs. A matrix is arranged in rows and columns. For  
example, the U2751A is a 48 matrix that can be used to  
connect four sources to eight test points as shown in  
Figure 2-1.  
Any column can be connected to any row by activating the  
corresponding relay that connects the column to the row as  
shown in Figure 2-1. Each cross-point relay on this module  
has its own unique channel label representing the row and  
column. For example, channel 302 represents the cross-point  
connection between row 3 and column 2.  
Be aware that it is possible to connect more than one source  
to the same point with a matrix. It is vital to make sure that  
these connections do not create dangerous or unwanted  
conditions.  
Note: Three-digit channel numbers are derived from  
the intersection of the rows and columns, with the  
last two digits representing the columns. The  
intersection shown represents channel 202  
(Row 2, Column 2)  
Figure 2-1 Switch matrix concept  
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2
Operation and Features  
Figure 2-2 Panel view of the Agilent Measurement Manager  
Agilent Measurement Manager Operation  
Launch the Agilent Measurement Manager software and  
select the Matrix tab. The keyboard shortcut key is Ctrl+M.  
Connect the instruments and devices as per your  
application. Key in the names of the instruments and devices  
in the available text boxes.  
Click the cross-point circles on the software to toggle the  
contact on or off. The connection from the row to the  
column will be highlighted when the circuit is closed.  
34  
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Operation and Features  
2
SCPI Commands  
The following examples show the SCPI commands for  
executing the closing and opening of the relays.  
Example 1, Make contact at channel 302  
-> *CLS; *RST  
// Resets the switch to the  
default power-on state.  
This command can be  
ignored if this operation is  
not required.  
-> ROUTe:CLOSe (@302) // Closes the relay at row 3,  
column 2.  
Example 2, Break contact at channel 302  
-> ROUTe:OPEN (@302)  
// Opens the relay at row 3,  
column 2.  
Example 3, Make contact at channel 101, 302  
-> ROUTe:CLOSe (@101,302) // Closes relays at row  
1, column 1 and row  
3, column 2.  
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2
Operation and Features  
Relay Cycle Counter  
Figure 2-3 Panel view of the relay cycle counter  
Agilent Measurement Manager Operation  
At the main panel, select the Relay Cycle Counter tab. The  
panel in Figure 2-3 will be displayed. The keyboard shortcut  
key is Ctrl+R.  
This feature allows the user to carry out preventive  
maintenance, which is to replace those relays that are at the  
end of their life span.  
Relay cycles that are above a certain limit will be highlighted  
in red. Refer to the example in Figure 2-3.  
36  
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Operation and Features  
2
System-Related Operation  
This section provides information on system-related topics  
such as executing a self-test, performing self-calibration  
routine, and reading error conditions.  
Do not connect any terminal block or cables prior to performing self-test  
process.  
NOTE  
Self-Test  
To perform the self-test, proceed as follows.  
Agilent Measurement Manager Operation  
Ensure that the switch terminals are not connected to any  
instrument. Turn on the U2751A. On the application panel,  
select Tools > Self-Test. This will perform a series of  
communication tests on the module, which take a couple of  
seconds to complete.  
Error Conditions  
Agilent Measurement Manager Operation  
A message box will appear once an error occurs while  
operating the U2751A using the Agilent Measurement  
Manager.  
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2
Operation and Features  
SCPI Commands for System-Related Tasks  
The following examples show the SCPI commands for  
performing certain system-related tasks.  
Example 4, Performing system-related tasks  
-> *CLS; *RST  
// Resets the switch to the  
default power-on state.  
This command can be  
ignored if this operation is  
not required.  
-> *TST?  
<- +0  
// Executes the self-test.  
// Returns a +0 if the test  
pass else it will return a  
+1 if it fails.  
-> SYST:ERR?  
// Returns the error number  
and its corresponding  
message string from the  
error queue.  
<- +0, "No Error"  
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U2751A USB Modular Switch Matrix  
User’s and Service Guide  
3
Characteristics and Specifications  
Product Characteristics 40  
Product Specifications 41  
This chapter specifies the characteristics, environmental  
conditions, and specifications of the U2751A.  
Agilent Technologies  
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3
Characteristics and Specifications  
Product Characteristics  
1
REMOTE INTERFACE  
Hi-Speed USB 2.0  
USBTMC 488.2 Class device  
POWER CONSUMPTION  
+12 VDC, 2 A maximum  
Installation Category III  
OPERATING ENVIRONMENT  
Operating temperature from 0 C to +50 C  
Relative humidity at 20% to 85% RH (non-condensing)  
Altitude up to 2000 meters  
Pollution degree 2  
For indoor use only  
STORAGE COMPLIANCE  
–20 C to +70 C  
SAFETY COMPLIANCE  
Certified with:  
IEC 61010-1:2001/EN61010-1:2001 (2nd Edition)  
Canada: CAN/CSA-C22.2 No. 61010-1-04  
USA: ANSI/UL 61010-1:2004  
EMC COMPLIANCE  
IEC 61326-2002/EN61326:1997+A1:1998+A2:2001+A3:2003  
Canada: ICES-001:2004  
Australia/New Zealand: AS/NZS CISPR11:2004  
SHOCK AND VIBRATION  
Tested to IEC/EN 60068-2  
I/O CONNECTOR  
DSub 25 male  
DIMENSIONS (W D H)  
105.00 175.00 25.00 mm (without bumpers)  
117.00 180.00 41.00 mm (with bumpers)  
WEIGHT  
428 g (without bumpers)  
480 g (with bumpers)  
WARRANTY  
One year  
CALIBRATION  
Annual calibration is not required  
1
For remote connections using Agilent E5813A, refer to Chapter 1.  
40  
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Characteristics and Specifications  
3
Product Specifications  
Table 3-3 Electrical and mechanical specifications update per attached data sheet  
U2751A  
Without U2922A Terminal Block With U2922A Terminal Block  
48, 2-wire  
Channels/configurations  
Switch type  
Armature latching  
Input characteristics (per channel)  
1
Max volts  
Standalone  
42 VDC/35 Vrms  
Modular (Used with U2781A)  
180 VDC/180 Vrms  
Max transient voltage  
300 Vrms  
Max current  
Switch current  
Carry current  
2 A  
2 A  
2
Power (W, VA)  
60 W, 62.5 VA  
8
Volt-Hertz limit  
10  
General specifications  
Thermal emf (differential)  
Initial closed channel resistance  
DC isolation (ch-ch, ch-earth)  
AC characteristics  
<3 V  
<1.5   
>10 G  
3
Bandwidth  
45 MHz  
30 MHz  
Insertion loss  
100 kHz  
1 MHz  
10 MHz  
45 MHz  
0.2 dB  
0.3 dB  
<2 dB  
<3 dB  
0.2 dB  
0.3 dB  
<2 dB  
<4.5 dB  
Capacitance  
HI-LO  
LO-Earth  
55 pF  
35 pF  
85 pF  
45 pF  
3
Crosstalk at terminal block (ch-ch)  
300 kHz  
1 MHz  
20 MHz  
45 MHz  
–70 dB  
–60 dB  
–35 dB  
–30 dB  
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3
Characteristics and Specifications  
Table 3-1 Electrical and mechanical specifications update per attached data sheet (continued)  
General characteristics  
Relay life, typical  
No load  
10 V, 100 mA  
Related load  
100 M  
10 M  
100 k  
Open/close time  
4 ms/4 ms  
1 DC or AC rms, channel-to-channel or channel-to-earth.  
2 Limited to 6 W channel resistance power loss per module.  
3 50 source, 50 load, differential measurements verified with a 4-port  
network analyzer (Sdd21).  
42  
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U2751A USB Modular Switch Matrix  
User’s and Service Guide  
4
Checking Defective Relay(s) 44  
Replaceable Parts 45  
Disassembly Instructions 46  
Reassembly Instructions 48  
Contacting Agilent Technologies 48  
This chapter provides guidelines for returning your  
instrument to Agilent for service or repair, and for servicing  
it yourself. A list of replaceable parts is also provided.  
Agilent Technologies  
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4
Service Information  
Checking Defective Relay(s)  
It is recommended to have the relay(s) checked when it reaches 10 million  
cycle counts. The relay cycle count can be obtained by using the Agilent  
Measurement Manager or sending the following SCPI command:  
NOTE  
DIAGnostic:RELay:CYCLes? (@<ch_list>)  
To check for any defective relay, the equipment required is a  
digital multimeter with continuity feature.  
1 Close the particular relay(s). For example: The relay  
located at Row x Column y.  
2 By referring to the connector configuration of the DSub  
connector, connect one of the DMM test leads to pin RxL  
and another test lead to pin CyL. The DMM should  
indicate that these two pins are connected or shorted.  
3 Once this is done, use the same method and perform the  
same test on pins RxH and CyH. These two pins should  
be connected or shorted as well.  
4 Now, open the particular relay(s). Using the same method,  
check if pins RxL and CyL are disconnected. Perform the  
same test on pins RxH and CyH as well.  
Row 1  
Column 1  
Figure 4-4 Defective relay(s) check  
44  
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Service Information  
4
Replaceable Parts  
This section contains the information for ordering  
replacement parts for your instrument. To order the parts,  
please do the following.  
Contact your nearest Agilent Sales Office or Service  
Center.  
Provide the part number for the relay.  
Provide the instrument model and serial number.  
The part number of the replaceable part and its description  
are shown in the table below.  
Table 4-2 Part number and description of replaceable part  
Part number  
Description  
0490-1896  
RELAY 2C 3 VDC-COIL 2A 30 VDC  
Electrostatic Discharge (ESD) Precautions  
CAUTION  
Almost all electrical components can be damaged by electrostatic  
discharge (ESD) during handling. The following guidelines will help  
prevent ESD damage when servicing the instrument or any electronic  
device.  
Disassemble the instruments in a static-free work area only.  
Use a conductive work area to dissipate static charge.  
Use a conductive wrist strap to dissipate static charge  
accumulation.  
Minimize handling.  
Keep the replacement parts in original static-free packaging.  
Remove all plastics, styrofoams, vinyls, papers, and other  
static-generating materials from the immediate work area.  
Use only antistatic solder extractor.  
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4
Service Information  
Disassembly Instructions  
Remove the screws and nuts as shown.  
Take the measurement board and carrier  
board out from the module.  
Remove the screws as indicated.  
46  
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Service Information  
4
Separate the carrier and measurement  
board.  
There are 32 relays as shown.  
Turn to the opposite side of the  
measurement board and ensure that only the  
defective relays are desoldered.  
Upon replacing the relay(s), reset the relay cycle count to  
zero by issuing the following SCPI command:  
DIAGnostic:RELay:CYCLes:CLEar (@<ch_list>)  
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4
Service Information  
Reassembly Instructions  
The reassembly process is simply the reverse of disassembly.  
Contacting Agilent Technologies  
Types of Service Available  
If your instrument fails during the warranty period, Agilent  
will replace the unit for free. The replacement units will be  
shipped with new calibration certificates.  
Every replacement unit has its own serial number. The serial number of the  
defective unit does not transfer to the replacement unit. The warranty  
period of the replacement unit is based on the remaining warranty of the  
defective U2751A.  
NOTE  
Agilent Unit Exchange  
Contact your nearest Agilent Service Center to arrange for  
the replacement of your instrument. In the U.S., please call  
800-829-4444 and then select "Option 3" followed by  
"Option 1."  
The defective unit must be returned to Agilent before the replacement unit  
is shipped to you. Additional information regarding the unit exchange will  
be provided when you contact Agilent.  
NOTE  
48  
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Index  
channel label, 33  
channels, multiple  
chassis  
flowchart, 9  
#
55-pin backplane connector pin, 29  
G
configuration, 2  
installation, 30  
GND, 23, 29  
A
cleaning, general, 8  
column, 2, 23, 33, 34, 35, 44  
configuration, instrument  
connector, 23  
pin assignments, 23  
55-pin backplane connector pin, 29  
cross-point, 2  
AC  
I
characteristics, 41  
*IDN, 20  
AC/DC power adapter  
output voltage, 15  
I/O cable, 8  
inspection, initial, 8  
installation  
requirements, 15  
Agilent Measurement Manager  
help file, 2, 22  
Agilent Measurement Manager, 13  
connecting the module, 15  
IO Libraries Suite, 11  
launching the Agilent Measurement  
Manager, 21  
installation, 13, 14  
launching, 21, 22  
operation, 34, 36, 37, 37  
panel view, 34  
D
DC  
isolation, 41  
output plug, 15  
defective relays, check, 44  
DIAGnostic:RELay:CYCLes?  
(@<ch_list>), 44  
device under test. See DUT  
disassembly. See relays, replacing  
DSub connector, 23, 44  
DUT, 2  
module driver, 12  
system check, 10  
relay cycle count, 44, 47  
welcome screen, 22  
Agilent Modular Products Installation Menu  
Hardware Driver, 12  
Measurement Manager, 13  
Agilent U2751A USB Modular Switch  
Matrix,  
verifying the module connection, 20  
introduction  
U2751A USB modular switch matrix, 2  
IO Control, 11, 21  
IVI-COM driver, 9  
dialog box, 12  
Quick Reference Card, 7  
L
LED indicators, 32  
L-Mount kit, 7, 30  
E
B
electrical check, 8  
electrostatic discharge. See precautions  
error conditions  
bandwidth, 41  
bumper, 8  
bumper casing, 8, 30  
browser, 10  
M
matrix, V, VIII, 2, 7, 12, 33, 34  
maintenance, general, 8  
Agilent Measurement Manager  
operation, 37  
SCPI Commands, 38  
measurement board, 46, 47  
C
®
Microsoft Internet Explorer. See browser  
*CLS, 35, 38  
carrier board, 46, 47  
Certificate of Calibration, 7  
modular instrument chassis, 7, 29  
modular switch matrix. See introduction  
module driver. See installation  
F
firmware, 18, 19  
U2751A User’s and Service Guide  
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Index  
multiplexer, 33  
product dimensions  
with bumper, 6  
switch matrix concept, 33  
switching, 2, 33  
without bumper, 5  
product outlook  
system check, 10  
system-related operation, 37  
system requirements, 10, 12  
N
front view, 4  
rear view, 4  
top view, 3  
nBPUB, 29, 29  
NC, 29, 29  
T
product specifications  
AC characteristics, 41  
general characteristics, 42  
general specifications, 41  
input characteristics, 41  
purchase items, standard, 7  
*TST, 38  
terminal block, 41  
terminal block, U2922A. See U2922A  
test, automated, 2  
O
operating enviroment  
altitude, 40  
pollution degree, 40  
relative humidity, 40  
temperature, 40  
U
R
*RST, 35  
reassembly. See relays, replacing  
relay cycle counter, 2, 36  
relays, replacing  
operating checklist. See service  
operating system, 10  
operation, system related  
error conditions, 37  
self-test, 37  
U2922A  
dimensions, 26  
female DSub connector, 24, 28  
installation, 27  
outlook, 25  
pin configuration, 24  
terminal block, 24  
USB extension cable, 7  
USB indicator, 32  
USB interface, 2, 32  
USBTMC 488.2, 40  
DIAGnostic:RELay:CLEar (@<ch_list>),  
47  
disassembly, 46  
ESD precautions, 45  
reassembly, 48  
P
panel view, 34, 36  
parts, replaceable, 45  
pin assignments, 23  
power cord, 7, 15  
power jack, 15  
replaceable parts. See parts, replaceable  
row, 2, 23, 33, 34, 35, 44  
V
power up, U2751A, 32  
precautions,  
S
VBUS, 29  
ESD, IV, 45  
prerequisites, 10  
processor, 10  
SCPI commands, 2, 35, 38  
self-calibration, 37  
self-test, 37, 38  
W
warranty, 40, 48  
product characteristics  
dimensions, 40  
®
Windows 2000 Professional. See  
service  
operating system  
EMC compliance, 40  
I/O connector, 40  
operating enviroment, 40  
power consumption, 40  
remote interface, 40  
safety compliance, 40  
shock and vibration, 40  
storage compliance, 40  
warranty, 40  
Agilent unit exchange, 48  
SSI connector pin, 29  
SSI timing signal, 29  
STAR_TRIG, 29  
®
Windows Home Edition. See operating  
system  
®
Windows XP Professional. See operating  
system  
switch control  
Agilent Manager Measurement  
operation, 34  
introduction, 33  
weight, 40  
SCPI Commands, 35  
50  
U2751A User’s and Service Guide  
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Contact us  
To obtain service, warranty or technical assis-  
tance, contact us at the following phone or fax  
numbers:  
United States:  
(tel) 800 829 4444  
Canada:  
(tel) 877 894 4414  
China:  
(tel) 800 810 0189  
Europe:  
(fax) 800 829 4433  
(fax) 800 746 4866  
(fax) 800 820 2816  
(tel) 31 20 547 2111  
Japan:  
(tel) (81) 426 56 7832 (fax) (81) 426 56 7840  
Korea:  
(tel) (080) 769 0800  
Latin America:  
(tel) (305) 269 7500  
Taiwan:  
(fax) (080) 769 0900  
(tel) 0800 047 866  
(fax) 0800 286 331  
Other Asia Pacific Countries:  
(tel) (65) 6375 8100  
(fax) (65) 6755 0042  
Or visit Agilent World Wide Web at:  
Product specifications and descriptions in this  
document are subject to change without notice.  
® Agilent Technologies, Inc. , 2008, 2010  
Second Edition, April 12, 2010  
U2751-90011  
Agilent Technologies  
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