Tektronix Smoke Alarm j17 User Manual

Instruction Manual

J17

LumaColor Photometer

070-8531-04

This document applies for firmware version 1.00

and above.

Warning

The servicing instructions are for use by qualified

personnel only. To avoid personal injury, do not

perform any servicing unless you are qualified to

do so. Refer to all safety summaries prior to

performing service.

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WARRANTY

Tektronix warrants that this product will be free from defects in materials and

workmanship for a period of one (1) year from the date of shipment. If any such

product proves defective during this warranty period, Tektronix, at its option, either

will repair the defective product without charge for parts and labor, or will provide a

replacement in exchange for the defective product.

In order to obtain service under this warranty, Customer must notify Tektronix of

the defect before the expiration of the warranty period and make suitable

arrangements for the performance of service. Customer shall be responsible for

packaging and shipping the defective product to the service center designated by

Tektronix, with shipping charges prepaid. Tektronix shall pay for the return of the

product to Customer if the shipment is to a location within the country in which the

Tektronix service center is located. Customer shall be responsible for paying all

shipping charges, duties, taxes, and any other charges for products returned to

any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper

use or improper or inadequate maintenance and care. Tektronix shall not be

obligated to furnish service under this warranty a) to repair damage resulting from

attempts by personnel other than Tektronix representatives to install, repair or

service the product; b) to repair damage resulting from improper use or

connection to incompatible equipment; or c) to service a product that has been

modified or integrated with other products when the effect of such modification or

integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS

PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESSED OR

IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED

WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR

PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE

DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED

TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND

ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL,

INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF

WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE

POSSIBILITY OF SUCH DAMAGES.

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Table of Contents

General Safety Summary . . . . . . . . . . . . . . . . . .

Injury Precautions . . . . . . . . . . . . . . . . . . . . .

Product Damage Precautions . . . . . . . . . .

Safety Terms and Symbols . . . . . . . . . . . . .

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Getting Started

Product Description . . . . . . . . . . . . . . . . . . . . . . . 1Ć1

J17 Photometer Features . . . . . . . . . . . . . . 1Ć1

Unpacking the J17 Photometer . . . . . . . . . 1Ć3

Repackaging for Shipment . . . . . . . . . . . . . 1Ć3

Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Ć5

Battery and Power

Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Ć7

Using Battery Power . . . . . . . . . . . . . . . . . . . 1Ć7

Using the Optional AC Power Adapter . . 1Ć9

Operating Basics

Functional Overview . . . . . . . . . . . . . . . . . . . . . . 2-1

The J17 Display . . . . . . . . . . . . . . . . . . . . . . . 2-2

The J17 Side Panel . . . . . . . . . . . . . . . . . . . . 2-3

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Table of Contents

Reference

RSĆ232D Interface . . . . . . . . . . . . . . . . . . . . . . . . 3-1

RSĆ232 Pin Connections . . . . . . . . . . . . . . . 3-2

Command Set . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Report Format . . . . . . . . . . . . . . . . . . . . . . . . 3-5

Color Measurements . . . . . . . . . . . . . . . . . . . . . . 3-7

COLOR Button . . . . . . . . . . . . . . . . . . . . . . . . 3-7

J1820 Measurements . . . . . . . . . . . . . . . . . . 3-7

Specifications

Performance Verification

Maintenance

Cleaning6.-. .1. . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Replaceable Parts

Contents

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Table of Contents

Appendices

AppendixĂA:

Optional Accessories . . . . . . . . . . . . . . . . . . . . . A-1

AppendixĂB:

Photometry and Radiometry Reference . . . . B-1

AppendixĂC:

Chromaticity Reference . . . . . . . . . . . . . . . . . . . C-1

Glossary and Index

J17 Instruction Manual

iii

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Table of Contents

List of Figures

Figure 1Ć1:ăThe J17 Photometer . . . . . . . . 1Ć2

Figure 1Ć2:ăReplacing the Battery . . . . . . 1Ć8

Figure 1Ć3:ăLocation of J17 Power Adapter

Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Ć9

Figure 3Ć1:ăLocation of the RSĆ232D Port 3-1

Figure 3Ć2:ăRSĆ232 Pin Connections . . . . 3-2

Figure 3Ć3:ăRSĆ232D Report Format . . . . 3-5

Figure 6Ć1:ăTest Point Locations on the

A1 Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

Figure 7Ć1:ăJ17 Replaceable Parts . . . . . . 7-4

Figure BĆ1:ăCIE Photopic Curve . . . . . . . . B-5

Figure CĆ1:ăThe 1931 CIE Chromaticity Diagram

C-3

Figure CĆ2:ă1931 CIE Chromaticity Diagram

Showing Color Temperature . . . . . . . . . . . . C-4

Figure CĆ3:ăCorrelated Color Temperature

Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5

Figure CĆ4:ă1976 CIEĆUCS Chromaticity

Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7

Figure CĆ5:ăSpectral Tristimulus Values for

Equal Spectral Power Source

(CIE 1931 Standard 2° Observer) . . . . . . . C-8

Contents

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General Safety Summary

Review the following safety precautions to avoid injury

and prevent damage to this product or any products

connected to it.

Only qualified personnel should perform service proceĆ

dures.

While using this product, you may need to access other

parts of the system. Read the General Safety Summary

in other system manuals for warnings and cautions

related to operating the system.

Injury Precautions

Do Not Operate in Wet/Damp Conditions

To avoid electric shock, do not operate this product in

wet or damp conditions.

Do Not Operate in Explosive Atmosphere

To avoid injury or fire hazard, do not operate this

product in an explosive atmosphere.

Wear Eye Protection

To avoid eye injury, wear eye protection if there is a

possibility of exposure to highĆintensity rays.

J17 Instruction Manual

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General Safety Summary

ProductDamage Precautions

Use Proper Power Source

Do not operate this product from a power source that

applies more than the voltage specified.

Do Not Operate With Suspected Failures

If you suspect there is damage to this product, have it

inspected by qualified service personnel.

Do NotImmerse in Liquids

Clean the probe using only a damp cloth. Refer to

cleaning instructions.

Safety Terms and Symbols

Terms in This Manual

These terms may appear in this manual:

WARNING

Warning statements identify conditions or practices that

could result in injury or loss of life.

CAUTION

Caution statements identify conditions or practices that

could result in damage to this product or other

property.

Safety

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General Safety Summary

StaticĆSensitive Devices

Terms on the Product

These terms may appear on the product:

DANGER indicates an injury hazard immediately accesĆ

sible as you read the marking.

WARNING indicates an injury hazard not immediately

accessible as you read the marking.

CAUTION indicates a hazard to property including the

product.

Symbols on the Product

The following symbols may appear on the product:

Double

Insulated

DANGER

High Voltage

Protective

Ground (Earth)

Terminal

ATTENTION

Refer to

Manual

J17 Instruction Manual

vii

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General Safety Summary

viii

Safety

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Preface

This is the Instruction Manual for the J17 LumaColor

Digital Photometer/Radiometer/Colorimeter. This manuĆ

al covers all operating instructions for the J17.

This manual is divided into the following sections:

Getting Started contains a product description and

initial setup information.

Operating Basics contains a functional overview of

the photometer controls, display, and connections.

Reference provides information on the RSĆ232

interface and color measurement techniques.

Specifications

Performance Verification

Maintenance

Replaceable Parts

Appendices contains chromaticity reference inĆ

formation in the form of graphs and lookup tables.

It also contains descriptions of optional accessoĆ

ries.

Glossary

Index

For additional information on the operation and

specifications of the sensor heads, please refer to the

Technical Reference manual that came with your

sensors.

J17 Instruction Manual

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Preface

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Getting

Started

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Product Description

The J17 is a handheld digital light measurement device.

The interchangeable J1800 Series sensor heads,

designed for use with the J17 Photometer, provide the

ability to make photometric, radiometric, and

colorimetric measurements.

J17 Photometer Features

The J17 provides the following features:

Autoranging

Auto zero

Readings in either English or metric units

RSĆ232D interface

Interchangeable heads for future expansion

Battery or ACĆpowered operation (AC adapter

available as an optional accessory)

Backlighted display

J17 Instruction Manual

1Ć1

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Product Description

TEKLUMACOLOR

WHT

cd/m

HOLD

COLOR

ALT DISP

RANGING

UNITS

START

Photometer/

Radiometer/

Colorimeter

J17

Figure 1Ć1:ăThe J17 Photometer

1Ć2

Getting Started

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ProductDescription

Unpacking the J17 Photometer

The J17 Photometer is shipped with the following

equipment:

J17 Photometer

Instruction Manual

Alkaline battery (already installed in the J17)

Repackaging for Shipment

If you must shipthe J17, package it as follows:

ăStep 1:ăUse the original carton, or an equivalent

carton with dimensions at least three inches greater

than the instrument to allow for proper cushioning.

ăStep 2:ăCover the instrument with a polyethylene

bag to protect its finish.

ăStep 3:ăCushion the instrument on all sides with

packing material. Seal the carton with shipping

tape or with an industrial stapler.

ăStep 4:ăIf you are shipping the product to a TektroĆ

nix Service Center, be sure to label the carton with

the name of your company, a person to contact at

your company, and a description of the problem.

J17 Instruction Manual

1Ć3

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Product Description

1Ć4

Getting Started

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Setup

Follow this sequence when you set up the

J17 Photometer:

ăStep 1:ăCheck that a nineĆvolt alkaline battery is

installed in the battery compartment (see

page 1Ć8), or use the optionalAC adapter to conĆ

nect the J17 to an externalpower source (see

page 1Ć9).

ăStep 2:ăCover or shield the J1800 Series sensor

head from ambient light. The photometer selfĆtest

period will be significantly shorter if the sensor is

kept in the dark.

ăStep 3:ăConnect a J1800 Series sensor head to

the J17.

Always connect the sensor head to the J17 before

turning on the power. The J17 loads data from the

sensor head at powerĆon. If you connect a new sensor

head to the J17 while the power is on, any measureĆ

ments you take may be inaccurate.

NOTE

The J1810 sensor will not work with the J17.

ăStep 4:ăMove the J17 POWER switch to the ON

position.

When you turn the power on, the J17 performs the

following actions:

J17 Instruction Manual

1Ć5

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Setup

1. The J17 performs a brief selfĆtest. During the selfĆ

test,the J17 activates all elements of the display,

checks the battery voltage, and performs the

autoĆzero and autoĆrange functions.

NOTE

If no sensor head is connected to the J17, the

J17 will not proceed past the selfĆtest display.

Low battery voltage is indicated by a flashing

BAT indicator. If this icon appears, replace the

battery with a fresh one before taking any

measurements.

2. The J17 will display the default measurement units

for the type of sensor head attached. If measureĆ

ments are continuously updated, as with the J1803

Luminance Head, the J17 begins displaying meaĆ

surement readings automatically. With the J1820

Chromaticity Head, the J17 will complete one

measurement cycle and stop. (Pressing the START

button initiates a new measurement cycle.)

1Ć6

Getting Started

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Battery and Power

Information

The J17 Photometer may be powered by either of the

following sources:

A nonĆrechargeable nineĆvolt alkaline battery

An external AC power adapter, available as an

optional accessory. (See Replaceable Parts for

information about available accessories.)

Using Battery Power

The J17 Photometer provides a low battery warning to

help prevent incorrect readings due to low battery

power. Refer to Specifications for details on expected

battery life and environmental concerns.

Use the Correct Battery

Use only a nineĆvolt alkaline battery, IEC type 6LR61,

NEDA type 1604. (A carbonĆzinc nineĆvolt battery may

be used safely, but the operating life will be oneĆthird to

oneĆhalf that of an alkaline battery.)

Do not use rechargeable NiCd (nickelĆcadmium) batterĆ

ies. Their low power capacity and cell voltage will not

support the J17.

J17 Instruction Manual

1Ć7

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Battery and Power Information

Low Battery Warning

When battery voltage is below 7.2 volts, the J17 PhoĆ

tometer displays the flashing warning BAT in the upper

left corner of its display. At this point, you should reĆ

place the alkaline battery (see below).

BAT

If the battery voltage is below 7.2Ăvolts at initial

powerĆon, the J17 will not proceed past the selfĆtest.

Replacing the Alkaline Battery

Toreplace the alkaline battery, refer toFigureĂ1Ć2.

9 V Alkaline

Battery

Figure 1Ć2:ăReplacing the Battery

ăStep1:ă Turn off the J17 Photometer.

ăStep2:ă Open the battery compartment located on

the back cover of the J17.

ăStep3:ă Remove the used battery, and replace it

with a fresh one, arranging the wires so that they

will not interfere with the battery cover.

ăStep4:ă Close the battery compartment.

ăStep5:ă Turn on the J17 and make sure that the

lowĆbattery (BAT) warning is nolonger flashing.

1Ć8

Getting Started

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Battery and Power Information

Using the Optional AC Power Adapter

The J17 Photometer may be powered indefinitely by

using the external AC power adapter, available as an

optional accessory. The power adapter will override the

alkaline battery, if one is installed.

To use this adapter, plug the adapter's pin connector

into the EXT. POWER connector on the side of the J17

(see Figure 1Ć3). Plug the power adapter into an exterĆ

nal AC power outlet providing 120 VAC at 60 Hz.

9 to 12VDC

50mA MAX

BACKLIGHT

INTENSITY

RS232D

Figure 1Ć3:ăLocation of J17 Power Adapter Connector

The AC power adapter supplies approximately 12 VDC

at a minimum of 50 mA.

CAUTION

Be sure that any power supply you use with

the J17 provides power within the range of 9

to 12 VDC, and that the center contact polarity

of the adapter is positive. A power supply that

does not meet these requirements may damĆ

age the J17.

J17 Instruction Manual

1Ć9

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Battery and Power Information

The backlight will be illuminated at powerĆon when the

J17 is powered by the AC power adapter. The backlight

may be turned off, if desired, by pressing the BACKĆ

LIGHT button.

NOTE

Power supplies that provide less than 12Ăvolts

DC may not automatically turn on the backĆ

light.

1Ć10

Getting Started

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Operating

Basics

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Functional Overview

Connect a J1800 Series

sensor head here.

TEK LUMACOLOR

The POWER

All readings

appear on the

display. See

page 2-2.

switch turns the

J17 on or off. The

J17 performs a

brief selfĆtest at

powerĆon.

Press the

BACKLIGHT

button to light

the display. (Use

the BACKLIGHT

INTENSITY

Press the

RANGING button

to switch from

autoranging to

control, on the

right side of the

J17, to adjust

the backlight.)

HOLD

COLOR

ALT DISP

RANGING

manual ranging,

and to step

through the

UNITS

START

manual ranges.

(This feature

Press HOLD to

keep the current

measurement

reading on the

display. This

cannot be used

with the J1820.)

See page NO TAG.

Press UNITS to

select the

stops measureĆ

ment updating

until you press

HOLD again.

alternate units, if

any, for displayed

readings.

Photometer/

Radiometer/

Colorimeter

J17

Press COLOR

to cycle among

white, red,

When using the J1820

Chromaticity head, press START

to initiate a new reading.

yellow, green,

and blue

(Rear Panel)

Location of

battery

correction

factors to

maximize

compartment.

accuracy for

narrowĆband

light sources,

such as LEDs.

When using the J1820 Chromaticity head, press

ALT DISP to cycle among chromaticity

coordinates, luminance, and raw XYZ tristimulus

values.

J17 Instruction Manual

2-1

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Functional Overview

The J17 Display

The MAN icon

shows that manual

ranging is selected.

See page NO TAG.

The SAV icon indicates that the

displayed reading is not being

updated (the HOLD button has

been pressed).

The BAT icon flashes

when the battery

voltage drops below

7.2 V. See page 1Ć8.

BAT MAN SAV n E*% AVG SEC REM

One of WHT, RED, YEL,

GRN, or BLU appears

to show the selected

correction factor.

WHT

RED

YEL

kfL^{C SHIFT}

m W/m ²

m AV/sr

u’

(White is the default.)

GRN

BLU

m cdkK

kluxlm

kcd/m²

nm v’

The bar graph indicates

the level of the input

signal at the A/D

converter, which affects

the accuracy of the

reading. When using

manual ranging, choose

the range that produces

the longest bar graph

for best accuracy. The

specifiedaccuracy may

not be available if the

graph is at the low end

of the scale.

Measurement readouts are displayed as numerical

values in the center of the display, with the appropriate

units shown along the left or right side.

Additional items may appear on the display during

selfĆtest.

2-2

Operating Basics

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Functional Overview

The J17 Side Panel

9 to 12VDC

50mA MAX

BACKLIGHT

INTENSITY

RS232D

Connect the optional

AC adapter here.

See page 1Ć9.

Use the BACKLIGHT

INTENSITY control to

vary the brightness of

the display backlight.

Connect an RSĆ232

cable here for data

logging to a computer.

See page 3-1.

J17 Instruction Manual

2-3

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Functional Overview

2-4

Operating Basics

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Reference

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RSĆ232D Interface

You can usetheJ17 Photometer's RSĆ232D port to

read measurements to a remote terminal, or to save

measurement readings to a file on a computer. Any

ASCII terminal or communications software may comĆ

municatewith theJ17 via theRSĆ232D port.

9 to 12VDC

50mA MAX

BACKLIGHT

INTENSITY

RS232D

The RSĆ232D Port

Figure 3Ć1:ăLocation of the RSĆ232D Port

An RSĆ232 cableis availableas an optional accessory

to the J17 (refer to Appendix A, Accessories, for orderĆ

ing information). This cablehas a 3.5 mm connector for

the J17, and a DBĆ9 female connector for connection to

the computer. (Another common RSĆ232 connector on

computers and terminals is the DBĆ25 connector.

Adapters are commercially available to convert from the

DBĆ9 connector to a DBĆ25 connector.)

The RSĆ232 interface is connected to a VT100 or VT102

terminal, or a personal computer with a terminal

emulator installed. Typical examples of VT100 and

VT102 emulators are Kermit, ProComm, and the

Windows Terminal communications software.

J17 Instruction Manual

3-1

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RSĆ232D Interface

The J17 operates with the RSĆ232 parameters shown in

Table 3Ć1. The terminal must also be in the local echo

mode to see text as it is entered.

TableĂ3Ć1:ă RSĆ232 Parameters

Parameter

Baud Rate

Data Bits

Value

2400

Stop Bits

Data Type

Asynchronous

Operational

Mode

HalfĆduplex (accepts software flow

control)

RSĆ232 Pin Connections

Figure 3Ć2 shows the pin connections of the J17

RSĆ232 port and the optional RSĆ232 cable. The

RSĆ232D port is a 3.5 mm stereo phone plug.

RSĆ232

3.5 mm Stereo Phone Plug

Ground

Receive

Transmit

DBĆ9

(Female)

Figure 3Ć2:ăRSĆ232 Pin Connections

3-2

Reference

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RSĆ232D Interface

Command Set

The J17 Photometer recognizes a single command,

!NEW, which causes it to report a measurement or a

series of measurements. The J17 is case sensitive, so

the command must be in all capital (upper case) letĆ

ters.

Table 3Ć2 summarizes the syntax conventions of the

command set.

TableĂ3Ć2:ă Elements of J17 Command Syntax

Symbol

Meaning

Begins command. (All commands

should be prefaced with an exclamaĆ

tion point.)

{CR}

{LF}

Carriage return (ASCII 13); recogĆ

nized as an endĆofĆcommand delimitĆ

er.

Line feed (ASCII 10); also recognized

as an endĆofĆcommand delimiter.

(white space) A space act as a parameter delimiter

within commands. The J17 also recĆ

ognizes a comma (,) as a parameter

delimiter; these two characters may

be used interchangeably. Use only

one space or comma as a delimiter;

multiple delimiters will result in a null

statement.

italics

Items in italics are names of parameĆ

ters. Specify the appropriate value

when entering the command.

J17 Instruction Manual

3-3

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RSĆ232D Interface

!NEW Ċ causes the J17 to report a measurement, or a

series of measurements:

!NEW{CR} causes the J17 to transmit the a single

reading (the one currently displayed).

!NEW n{CR} causes the J17 to transmit multiple

readings as they are taken.

Any value for ngreater than 128 causes the J17 to

report measurements continuously, until another

command is sent.

To interrupt the reporting, a single !will hold reĆ

ports.

To stop reporting, a !NEW{CR}will stop and susĆ

pend the continuous reports.

NOTE

Whenusing the J1820 color head, the values

delivered by the report will only be the value of

the last measurement. The START button

must be pressed each time a new

measurement is taken.

If an off scale (999.9) reading is taken, the J17

will suspend RSĆ232D reporting until the

reading is within the measurement range of

the instrument.

3-4

Reference

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RSĆ232D Interface

Report Format

The data format for measurements consists of two

major fields: the measurement units and the measureĆ

ment value(s). See Figure 3Ć3.

WM 0.000E0

XYZ 0.000E0,0.000E0,0.000E0

Exponential

Measurement

Units

(See Table 3Ć3)

Multiplier

Measurement

Value

Figure 3Ć3:ăRSĆ232D Report Format

Measurement unit abbreviations are listed in TableĂ3Ć3.

Values are displayed with four significant digits, and a

oneĆdigit exponential multiplier with an optional minus

sign. For multiple values (for example, the three values

reported for an XYZ reading), commas separate the

values.

Each line is terminated by a carriage return and line

feed (CR/LF).

J17 Instruction Manual

3-5

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RSĆ232D Interface

TableĂ3Ć3:ă Measurement Units

Abbreviation

Used

Meaning

candelas

candelas/meter

footĆcandles

footĆlamberts

Kelvin

LUM

LUX

lumens

lux

watts

WMS

XYZ

watts/meter

watts/meter /steradian

tristimulus values

3-6

Reference

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Color Measurements

This section is included to clarify the function of the

COLOR and START buttons.

COLOR Button

The J17 has a button labeled COLOR for use with

certain heads. Pressing this button and toggling

through the separate colors does not give a readout of

the color component of that source. The button is used

when measuring pure color sources to fine adjust the

sensor calibration to that specific color. For example:

the RED mode should be selected when measuring the

output of a red LED.

When using heads for a broad spectrum of light

sources, us the WHITE setting. Use the color settings

only if you are measuring narrow spectrum light

sources such as lasers and LEDs.

J1820 Measurements

The J1820 is a true color head. Set the COLOR button

to WHITE and then press the START button to get an

accurate reading of the composition of the source.

The default color coordinate system is the x,y system.

To change to the u'v' system, press the UNITS button.

To display the luminance value, press the ALT DISP

button. The default luminance units are cd/m (NITs).

To change to fL (footlamberts), press the UNITS button.

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Color Measurements

To display measurements in the XYZ color coordinate

system, press the ALT DISP button. The display will

show the X and Y values. To display the Z value, press

the UNITS button.

3-8

Reference

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Specifications

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Specifications

These characteristics are valid under the following

conditions:

The J17 and sensor head must have been caliĆ

brated at an ambient temperature between +20° C

and +30° C.

The J17 and sensor head must be used in an

environment within the limits described in Table 4Ć5,

Warranted Environmental Characteristics.

The J17 and sensor head must have had a warmup

period of at least 10 minutes.

Optical measurements are referred to photometric,

radiometric, and colorimetric standards traceable to

NIST.

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Specifications

TableĂ4Ć1:ă Warranted Electrical Characteristics

Characteristic

Standard

Accuracy

1% of reading± 2 Counts

(ExcludingsensorĆhead, inĆ

cludingnonlinearity)

TableĂ4Ć2:ă Warranted Sensor Ranges

Sensor Units

Max Reading

Min. Reading

J1803

500,000

0.01

0.03

cd/m (Nits)

1,500,000

J1805

J1806

J1811

100

0.00001

0.001

W/m /sr

1000

5000

0.001

0.01

lux (lm/m )

50,000

J1812

mW/m

20,000

2ĂmW

0.01

1ĂnW

J1820

(Y)

100,000

300,000

0.1

0.3

cd/m (Nits)

J1820

u'v', xy

0.999

0.001

J1823

10,000

30,000

0.1

0.3

cd/m (Nits)

J1823

Opt. 01

10,000

30,000

cd/m (Nits)

Refer to sensorĆhead documentation for

detailed specifications.

4-2

Specifications

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Specifications

TableĂ4Ć3:ăTypical Electrical Characteristics

Characteristic

Standard

Power Requirements

ąąAlkaline battery

IEC type 6LR61,

NEDA type 1604

7 V to 10 V

ąąExternal Power Supply

9 V to 12 VDC

30 hours

Battery Life

ąąIEC 6LR61 battery with

ąąbacklight off and

ąąRSĆ232 unplugged.

Battery Low Indication

7.2 V

TableĂ4Ć4:ăTypical Mechanical Characteristics

Characteristic

Standard

Height

198Ămm (7.8 inches)

(Without sensor.)

Width

93Ămm (3.7 inches)

34Ămm (1.3 inches)

1.4Ăkg (3 lbs)

Depth

Shipping Weight

(Includes battery, manual,

andpackaging.)

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Specifications

TableĂ4Ć5:ă Warranted Environmental Characteristics

Characteristic

Standard

Temperature

ąąNonoperating

ąąOperating

-55° C to +85° C

-15° C to +55° C

Humidity, operating and

nonoperating

J17 Meets MIL Std 28800E Class 3

Refer to the Environmental CharacterĆ

istics for each J1800 Series sensor

head.

TableĂ4Ć6:ă Certifications and compliances

EC Declaration of

Conformity

Meets intent of Directive 89/336/EEC for

Electromagnetic Compatibility. Compliance

was demonstrated to the following specificaĆ

tions as listed in the Official Journal of the

European Communities:

EN 55011

Class B Radiated and

Conducted Emissions

EN 50081Ć1 Emissions:

EN 60555Ć2 AC Power Line Harmonic

Emissions

EN 50082Ć1 Immunity:

IEC 801Ć2

IEC 801Ć3

IEC 801Ć4

IEC 801Ć5

Electrostatic Discharge

Immunity

RF Electromagnetic Field

Immunity

Electrical Fast Transient/Burst

Immunity

Power Line Surge Immunity

FCC Compliance

Emissions comply with FCC Code of Federal

Regulations 47, Part 15, Subpart B, Class A

Limits

4-4

Specifications

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WARNING

The following servicing instructions are for use only by

qualified personnel. To avoid injury, do not perform any

servicing other than that stated in the operating instructions

unless you are qualified to do so. Refer to all Safety

Summaries before performing any service.

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Performance

Verification

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Performance

Verification

Performance verification procedures are included in

the manual shipped with the J1800 series sensor

heads.

NOTE

The J1810 chromaticity sensor will not work

with the J17. The J1810 sensor will only

work with the J18 LumaColor II

photometer.

If the sensor and photometer do not pass the perforĆ

mance verification, contact your local Tektronix repreĆ

sentative for support.

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Performance Verification

5-2

Performance Verification

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Maintenance

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Maintenance

The J17 Photometer and J1800 Series heads do not

require periodic maintenance. Clean the instrument

case and sensors as directed in the Cleaning section.

If the J17 Photometer or one of the J1800 Series

sensorĆheads does not appear to function correctly,

the information in this section will helpyou isolate the

problem.

Basic Troubleshooting lists some operating condiĆ

tions to check for if you believe the J17 or the sensorĆ

head is not operating correctly.

BoardĆlevel Troubleshooting will allow you to isolate

most problems to one of the two replaceable circuit

boards in the J17. Use these procedures if you want

to repair the J17 yourself.

Cleaning

Instrument Cleaning

Clean the instrument case by wiping it with a damp

cloth. Follow these important guidelines:

Dampen a soft cloth and wipe the dirt off. Do not

spray cleaner directly onto the photometer.

Use a mild detergent or isopropal alcohol. Do

not clean the case with strong solvents that may

etch the plastic or remove the lettering.

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Maintenance

Sensor Cleaning

Clean the sensor case by wiping it with a soft damp

cloth. Do not attempt to cleaning the internal optics.

Follow these important guidelines:

Follow the guidelinesfor cleaning the photometer

case.

Clean external lenses using a lens cloth dampĆ

ened with lenscleaning solution. Do not apply

lens cleaning solution directly to the lens.

Use clean compressed air to blow dust out of

sensors.

Calibration

An annual recalibration of the heads will ensure best

accuracy. The Performance Verification section in the

manual that is shipped with the sensorĆhead details

the procedures for checking the sensorĆheads.

There are no calibration adjustments within the

photometer or sensors. Calibration values are stored

in an EEPROM circuit located in the sensorĆhead.

Contact you local Tektronix representative for assisĆ

tance if either product doesnot passa performance

verification check.

6-2

Maintenance

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Maintenance

Basic Troubleshooting

This section lists some common problems and their

mostlikely causes.

The J17 Does NotPower On, or Backlight

Does NotLight

Check the battery. Install a fresh battery, and ensure

that it is seated correctly. If the optional AC adapter is

available, use it to connect the J17 to a power

source.

The Display Shows Err

The word Err (error) appears on the display when

you press a button that is not appropriate with the

sensorĆhead attached to the J17, or not appropriate

in the chosen operating mode.

Measurements are Inaccurate

If measurements taken with the J17 are inaccurate or

inconsistent, check the operating setup:

Connect the sensorĆhead to the J17 before

powering on. If not, turn the J17 off, then turn it

back on. The J17 will load data from a sensorĆ

head atpowerĆon.

Make sure that the sensorĆhead is positioned so

that the measurement field is entirely filled. This is

important for luminance, radiance, and chromaĆ

ticity measurements.

Make sure that the area being viewed by the

sensorĆhead is uniformly illuminated. This is

important for luminance, radiance, and chromaĆ

ticity measurements.

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Maintenance

Position the sensorĆhead so that it does not

shadow the surface being measured. Shadowing

will occur if the surface is being measured from

direction of the illumination.

Do not operate the head in contact with the

surface. Placing the head too close to the surface

may cause shadowing. Reflections may also

occur between the front surface of the head and

the surface to be measured.

The light shield or suction cup provides adequate

spacing between the head and the surface to

prevent reflection on backlighted surfaces.

Check for cable damage where the cable enters

the photometer plug and sensorĆhead. Be careful

not to stress the sensor cable and damage it.

Do not flex the sensorĆhead cable when taking

lowĆlight measurements. The high sensitivity of

the photometer will detect charges generated in

the cable when used at high sensitivity ranges.

If measurements are still incorrect, the sensorĆhead

may require calibration. Contact your Tektronix repreĆ

sentative.

RSĆ232 Port Does Not Work

Check the following to make sure that you are propĆ

erly connected to the RSĆ232 port:

Check the terminal software to make sure it is

addressing the correct COM port.

Check the communication protocols to make

sure they agree with those in the Specifications

section.

6-4

Maintenance

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Maintenance

Turn on the backlight and see if it goes out when

entering a command via the RSĆ232 port. The

backlight will come back on when the command

is ended or if it is invalid.

Make sure that any adapters that you are using

are correctly wired.

BoardĆlevel Troubleshooting

The two circuit boards in the J17 may be replaced. If

the J17 does not function, you can use these proceĆ

dures to isolate the problemto one of the boards.

Refer to Replaceable Parts for ordering information.

Static electricity can damage the circuit

boards of the J17. Observe static precauĆ

tions when the covers of the J17 are reĆ

moved. Servicing should be performed by

qualified personnel only.

Most functions of the J17 are located on the

A1 board. The A2 Display board controls the display,

backlight, and keyboard. The general troubleshootĆ

ing sequence for the J17 is:

1. Verify that the problemis not covered in Basic

Troubleshooting.

2. Check for a display, backlight, or keyboard

problem(indicating the A2 board). If there apĆ

pears to be a display problem, also check the

power supply on the A1 board, which could be at

fault.

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Maintenance

3. Other problems are typically due to the A1 board.

If a power supply problem is suspected, perform

the procedure in Checking the Power Supply on

page 6-6 to verify that the power supply, and

not the battery, is at fault.

The A1 Board

Most functions of the J17 are located on the

A1 board. Checking the Power Supply on page 6-6

will allow you to determine whether there is a power

supply problem.

The A2 Display Board

The A2 Display board is probably at fault if:

segments of the display are missing

the backlight does not operate

To check the display, power on the J17 without a

sensorĆhead attached, and note whether all segĆ

ments of the display are activated.

If the entire display is inactive, or if the backlight does

not operate, proceed to Checking the Power Supply

to rule out a problem with the power supply.

Checking the Power Supply

To check the power supply, you will need:

/ Ăinch hex wrench

Posidriv screwdriver

a DC voltmeter

(for voltages in the range 0 to 15 V)

NineĆvolt, IEC 6LR61Ćtype alkaline battery

6-6

Maintenance

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Maintenance

ăStep 1:ăRemove the battery from the battery

compartment.

CAUTION

To avoid equipment damage, do not apply

power to the J17 while disassembling it.

Static electricity can damage the circuit

boards of the J17. Observe static precauĆ

tions when the covers of the J17 are reĆ

moved.

ăStep 2:ăUsing the hex wrench, remove the four

screws from the J17 front panel.

ăStep 3:ăRemove the back cover of the J17.

ăStep 4:ăRemove the five screws that attach the

A1 board to the A2 board.

ăStep 5:ăGently pull the two boards apart, taking

care not to bend the connector pins on the

A1 board.

ăStep 6:ăConnect the battery to the A1 board and

turn on the power switch.

ăStep 7:ăConnect the voltmeter to test point 90

and test point 32 (ground). Check test point 90

for a voltage of +7.2 V or higher. Refer to FigĆ

ure 6Ć1 for test point locations.

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Maintenance

If the voltage at test point 90 is less than +7.2 V, the

problemis the battery, not the power supply. If the

voltage is +7.2 V or greater, proceed to Step 8.

ăStep 8:ăHold the connection to test point 32

(ground) and check for a voltage of +5.75 V

± 0.05 V at test point 30.

ăStep 9:ăWhile still connected to test point 32

(ground), check test point 31 for a voltage of

+5.000 V ± 0.025 V.

If the voltages at test points 30 and 31 are correct,

the problemis not the power supply. If these voltages

are not correct, the A1 board must be replaced.

Test Point 32

Test Point 30

Test Point 31

(+5.000 V ±0.025 V)

(Ground)

(+5.75 V ±0.05 V)

Test Point 90

(+7.2 V or Higher)

Figure 6Ć1:ăTest Point Locations on the A1 Board

6-8

Maintenance

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Replaceable

Parts

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Replaceable Parts

This section contains a list of the modules that are

replaceable forthe J17 Photometerand the J1800 SeĆ

ries sensor heads. Use this list to identify and order

replacement parts.

Parts Ordering Information

Replacement parts are available from or through your

local Tektronix, Inc. service center or representative.

Changes to Tektronix instruments are sometimes made

to accommodate improved components as they beĆ

come available and to give you the benefit of the latest

circuit improvements. Therefore, when ordering parts, it

is important to include the following information in your

order:

Part number

Instrument type or model number

Instrument serial number

Instrument modification number, if applicable

If a part you order has been replaced with a different or

improved part, your local Tektronix service center or

representative will contact you concerning any change

in the part number.

Change information, if any, is located at the rear of this

manual.

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Replaceable Parts

Using the Replaceable Parts List

The tabular information in the Replaceable Parts List is

arranged for quickretrieval. Understanding the strucĆ

ture and features of the list will help you find the all the

information you need for ordering replacement parts.

Item Names

In the Replaceable Parts List, an Item Name is sepaĆ

rated from the description by a colon (:). Because of

space limitations, an Item Name may sometimes apĆ

pear as incomplete. For further Item Name identificaĆ

tion, U.S. Federal Cataloging HandbookH6Ć1 can be

used where possible.

Indentation System

This parts list is indented to show the relationship

between items. The following example is of the indentaĆ

tion system used in the Description column:

1ą 2ą 3ą 4ą 5

Name & Description

Assembly and/or Component

Attaching parts for Assembly and/or Component

(END ATTACHING PARTS)

DetailPart of Assembyl and/or Component

Attaching parts for DetailPart

(END ATTACHING PARTS)

Parts of DetailPart

Attaching parts for Parts of DetailPart

(END ATTACHING PARTS)

Attaching parts always appear at the same indentation

as the item it mounts, while the detail parts are inĆ

dented to the right. Indented items are part of, and

included with, the next higher indentation. Attaching

parts must be purchased separately, unless otherwise

specified.

7-2

Replaceable Parts

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Replaceable Parts

Abbreviations

Abbreviations conform to American National Standards

Institute (ANSI) standard Y1.1

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Replaceable Parts

Figure 7Ć1:ăJ17 Replaceable Parts

7-4

Replaceable Parts

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Replaceable Parts

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Replaceable Parts

7-6

Replaceable Parts

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Replaceable Parts

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Replaceable Parts

7-8

Replaceable Parts

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Appendices

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AppendixĂA:

Optional Accessories

In addition to the J1800 Series sensor heads, the

followingitems are available for use with the J17 PhoĆ

tometer:

External DC power supply

(120 VAC North American)

External DC power supply

(220 VAC European)

RSĆ232D cable

For part number information, refer to the Replaceable

Parts section.

For detailed information and prices, or to obtain reĆ

placements, see a Tektronix products catalogor conĆ

tact your local Tektronix field representative.

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Appendix A: Optional Accessories

A-2

Appendices

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AppendixĂB:

Photometry and

Radiometry Reference

This appendix summarizes convenient relationships

and formulasused in photometry and radiometry.

Photometric Relationships

In photometry, the spectral sensitivity of the sensor is

matched to the average human eye, with a peak at

555Ănm.

An isotropic light source (a source that emits light

uniformly in all directions) of 12.6 lumensis1 canĆ

dela (1 candle power).

A 1 candela source at a distance of 1 meter proĆ

videsan illuminance of 1 lux on a surface, regardĆ

less of the reflectance of the surface.

A 1 candela source at a distance of 1 foot provides

an illuminance of 1 footcandle on a surface, regardĆ

less of the reflectance of the surface

Moving a light source further from a surface reĆ

ducesthe illuminance proportionally with the

square of the distance (inverse square law). For

example, moving a 1 candela source from 1 foot to

2 feet will reduce the illuminance to ¼ footcandle.

A perfectly white, diffuse surface illuminated by

1 footcandle hasa surface luminance of 1 footlamĆ

bert.

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Appendix B: Photometry and Radiometry Reference

A diffuse surface that has a reflectance of less than

100% will have a surface luminance, in footlamĆ

berts, equal to the illuminance in footcandles multiĆ

plied by the reflectance factor.

Measurement of the luminance of a large uniformly

illuminated surface is essentially independent of

distance, since the area viewed by the sensor

increases with the square of the distance, exactly

compensating for light falloff due to the inverse

square law.

Photometric Formulas

10.764 @ footcandles + luxĂ Ă Ă (lumensńmeter²)

3.426 @ footlamberts + nitsĂ Ă Ă (candelańmeter²)

footcandles @ distance²Ă Ă (inĂ feet) + candelas

lux @ distance²Ă Ă (inĂ meters) + candelas

footcandles @ surfaceĂ reflectanceĂ factor + footlamberts

B-2

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Appendix B: Photometry and Radiometry Reference

Radiometric Relationships

In radiometry, an ideal sensor has equal sensitivity to all

wavelengths of light being measured.

An isotropic light source (a source that emits light

uniformly in all directions) of 12.6 watts produces a

radiant flux of 1 watt/steradian.

1 watt/steradian at a distance of 1 meter produces

an irradiance of 1 watt/meter .

Moving a light source further from a surface reĆ

duces the irradiance proportionally with the square

of the distance (inverse square law). For example,

moving a 1 watt/steradian source from 1 meter to

2 meters will reduce the irradiance to ¼ watt/meĆ

ter .

A perfectly white, diffuse surface illuminated by an

irradiance of 1 watt/meter has a surface radiance

of .318 watt/meter /steradian (irradiance divided by

p).

A diffuse surface that has a reflectance of less than

100% will have a surface radiance, in watts/meĆ

ter /steradian, equal to the irradiance multiplied by

the reflectance factor and divided by p.

Measurement of the radiance of a large uniformly

illuminated surface is essentially independent of

distance, since the area viewed by the sensor

increases with the square of the distance, exactly

compensating for light falloff due to the inverse

square law.

Radiometric Formulas

wattńcm²@ 10000 + wattńmeter²

wattńmeter²@ distance²Ă Ă (inĂ meters) + wattństeradian

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Appendix B: Photometry and Radiometry Reference

A Note on the Relation of Photometric and

Radiometric Data

Note that it is not possible to convert photometric units

to radiometric units, or the reverse, except under preĆ

cisely specified conditions. This is due to the greatly

differing spectral sensitivity curves between photometĆ

ric and radiometric sensors.

For a 555Ănanometer, monochromatic source, 1 watt is

equal to 683 lumens. Conversion of photometric data to

radiometric data for monochromatic sources of other

wavelengthsmay be calculated using the relative

sensitivity of the photopic response curve at that waveĆ

length (y(l) in Table CĆ1). Broader sources must be

converted using mathematical integrations of their

intensity and the photopic curve at each wavelength.

B-4

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Appendix B: Photometry and Radiometry Reference

CIE Photopic Curve

The CIE photopic curve is an international standard for

the color response of the average human eye. By

definition, footcandles, footlamberts, lux, and nits are

based on a detctor having a color response identical to

the CIE photopic curve. Tektronixphotopic sensors

have response curves that match the CIE photopic

curve. Refer to Figure BĆ1.

100

380

420

460

500

540

580

620

680

700

(nm)

Figure BĆ1:ăCIE Photopic Curve

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Appendix B: Photometry and Radiometry Reference

B-6

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AppendixĂC:

Chromaticity Reference

The reference material in this appendix can help you

categorize and understand chromaticity measurements

taken using the J1820 Chromaticity head. This appenĆ

dix includes:

the 1931 CIE Chromaticity diagram for x,y readings

the 1976 CIEĆUCS chromaticity diagram for ui, vi

readings

Spectral tristimulus (X, Y, Z) values for an equal

spectral power source, in both graphical and

tabular format.

For additional information, we recommend the article

Standardizing CRT Measurements" by Peter Keller, in

the April 1984 issue of Test and Measurement World.

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Appendix C: Chromaticity Reference

The 1931 CIE Chromaticity Diagram

The 1931 CIE chromaticity diagram, also known as a

Kelly chart, is shown in FigureĂCĆ1. The diagram can be

used to categorize chromaticity measurements exĆ

pressed as x, y values. The x, y values are determined

from the spectral tristimulus values (X, Y, Z), by the

following equations:

x +

y +

X ) Y ) Z

The main features of the 1931 CIE chromaticity diagram

include:

All colors perceptible to the average human eye fall

within the bounded area of the chart.

A straight line drawn through two colors, and

passing through the equal energy point (xĂ=Ă0.333,

yĂ=Ă0.333), indicates complimentary colors.

Saturated colors, which are located on the periphĆ

ery of the bounded area, are monochromatic,

except on the purple to red boundary. Colors

become progressively less saturated toward the

white achromatic region in the center. The degree

of saturation is a measure of color purity.

Boundaries between colors are not distinct; one

color blends gradually into the next.

The ratio of distances between two colors to a third

color located on a line drawn between them is

proportional to the ratio of intensities of a mixture of

those two colors required to produce the third

color.

The principal disadvantage of the x,y chart is that equal

distances on the diagram do not represent equal

perceived color distances.

C-2

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Appendix C: Chromaticity Reference

.900

.800

.700

.600

Greenish Yellow

Yellowish

Green

Yellow

Yellowish

Orange

Green

Yellow

Green

.500

.400

Reddish

Orange

Bluish

Orange

Green

Yellowish

Pink

White

Blue

Pink

Green

.300

.200

.100

Red

Purplish Red

Purplish

Pink

Greenish

Blue

Red

Purple

Blue

Purple

Purplish

Blue

.000

.100

.200

.300

.400

.500

Reddish

Purple

.600

.700

Bluish

Purple

X Coordinate

Figure CĆ1:ăThe 1931 CIE Chromaticity Diagram

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Appendix C: Chromaticity Reference

Figure CĆ2 showsthe Planckian locuson the 1931 CIE

diagram. The numbersalong thisline indicate the color

temperatures(in degreesKelvin) for blackbody light

sources.

.900

.800

.700

.600

.500

.400

2350

1900

2850

3500

1500

4800

1000

6500

10,000

24000°K

Infinity

.300

.200

.100

.000

.100

.200

.300

.400

.500

.600

.700

x Coordinate

Figure CĆ2:ă1931 CIE Chromaticity Diagram Showing Color Temperature

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Appendix C: Chromaticity Reference

FigureĂCĆ3 shows selected isotemperature lines in the

x,y coordinate system. A light source along one of the

isotemperature lines will most nearly match the color

temperature of a blackbody radiator indicated for that

line.

0.500

0.450

0.400

0.350

2500

2854

2000

3000

4000

5000

5500

6000

6500

7500

Planckian

Locus

10000

15000

20000

0.300

0.250

0.200

0.250

0.300

0.350

0.400

0.450

0.500

0.550

0.600

x Coordinate

Figure CĆ3:ăCorrelated Color Temperature Diagram

Although the colors displayed along an isotemperature

line will appear similar, there will be noticable differĆ

ences. For the best results when setting display color

balance, use the precise color coordinates of the

crossing of the Planckian Locus by the desired color

temperature. For example, x = 0.318 and Y = 0.332 is

the location of D65 (6500 K). Do not use correlated

color temperature alone.

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Appendix C: ChromaticityReference

The 1976 CIEĆUCS ChromaticityDiagram

The 1976 CIEĆUCS (Uniform Chromaticity Scale) diaĆ

gram, shown in FigureĂCĆ4, can be used to categorize

chromaticity measurements expressed as ui, vi values.

ui and vi are related to the x and y values of the 1931

CIE chromaticity diagram by the following equations:

* 2x ) 12y ) 3

uȀ +

vȀ +

* 2x ) 12y ) 3

This diagram is similar to the 1931 CIE chromaticity

diagram except for the following:

Equaldistances on the diagram represent approxiĆ

mately equal perceived color differences.

The equalenergy point is u iĂ=Ă0.210, viĂ=Ă0.473.

The primary disadvantage of the 1976 CIEĆUCS diaĆ

gram is that color mixtures cannot be determined easily

from the coordinates and intensities of their compoĆ

nents.

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Appendix C: Chromaticity Reference

Yellowish

Green

Greenish

Yellow

Orange Yellow

Orange

Yellow

Green

Yellowish Pink

Reddish Orange

.600

Green

.500

.400

.300

Red

Pink

Bluish

Green

White

Purplish

Pink

Purplish Red

Greenish

Blue

Reddish

Purple

Blue

Purple

.200

.100

.000

.100

.200

.300

.400

.500

.600

Purplish Blue

ui Coordinate

Figure CĆ4:ă1976 CIEĆUCS Chromaticity Diagram

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Appendix C: Chromaticity Reference

Spectral Tristimulus Values

FigureĂCĆ5 shows the spectral tristimulus (XYZ) values

for a light source of equal spectral power. Table CĆ1

lists the same data intabular format.

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

z(l)

y(l)

x(l)

380

430

480

530

580

630

680

730

780

Wavelength (nm)

Figure CĆ5:ăSpectral Tristimulus Values for Equal Spectral Power Source

(CIE 1931 Standard 2° Observer)

Note that y(l) is also the photopic curve that represents

the relative sensitivity of the average human eye.

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Appendix C: Chromaticity Reference

TableĂCĆ1:ăSpectral Tristimulus Values for Equal Spectral Power Source

(CIE 1931 Standard 2° Observer)

Wavelength (nm)

x(l)

0.0014

y(l)

0.0000

z(l)

0.0065

380

385

390

395

400

0.0022

0.0042

0.0076

0.0143

0.0001

0.0002

0.0004

0.0105

0.0201

0.0362

0.0679

405

410

415

420

425

0.0232

0.0435

0.0776

0.1344

0.2148

0.0006

0.0012

0.0022

0.0040

0.0073

0.1102

0.2074

0.3713

0.6456

1.0391

430

435

440

445

450

0.2839

0.3285

0.3483

0.3481

0.3362

0.0116

0.0168

0.0230

0.0298

0.0380

1.3856

1.6230

1.7471

1.7826

1.7721

455

460

465

470

475

0.3187

0.2908

0.2511

0.1954

0.1421

0.0480

0.0600

0.0739

0.0910

0.1126

1.7441

1.6692

1.5281

1.2876

1.0419

480

485

490

495

500

0.0956

0.0580

0.0320

0.0147

0.0049

0.1390

0.1693

0.2080

0.2586

0.3230

0.8130

0.6162

0.4652

0.3533

0.2720

505

510

515

520

525

0.0024

0.0093

0.0291

0.0633

0.1096

0.4073

0.5030

0.6082

0.7100

0.7932

0.2123

0.1582

0.1117

0.0782

0.0573

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Appendix C: Chromaticity Reference

TableĂCĆ1:ăSpectral Tristimulus Values for Equal Spectral Power Source

(CIE 1931 Standard 2° Observer) (Cont.)

Wavelength (nm)

x(l)

0.1655

y(l)

0.8620

z(l)

530

535

540

545

550

0.0422

0.0298

0.0203

0.0134

0.0087

0.2257

0.2904

0.3597

0.4334

0.9149

0.9540

0.9803

0.9950

555

560

565

570

575

0.5121

0.5945

0.6784

0.7621

0.8425

1.0000

0.9950

0.9786

0.9520

0.9154

0.0057

0.0039

0.0027

0.0021

0.0018

580

585

590

595

600

0.9163

0.9786

1.0263

1.0567

1.0622

0.8700

0.8163

0.7570

0.6949

0.6310

0.0017

0.0014

0.0011

0.0010

0.0008

605

610

615

620

625

1.0456

1.0026

0.9384

0.8544

0.7514

0.5668

0.5030

0.4412

0.3810

0.3210

0.0006

0.0003

0.0002

0.0001

630

635

640

645

650

0.6424

0.5419

0.4479

0.3608

0.2835

0.2650

0.2170

0.1750

0.1382

0.1070

0.0000

655

660

665

670

675

0.2187

0.1649

0.1212

0.0874

0.0636

0.0816

0.0610

0.0446

0.0320

0.0232

0.0000

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Appendix C: Chromaticity Reference

TableĂCĆ1:ăSpectral Tristimulus Values for Equal Spectral Power Source

(CIE 1931 Standard 2° Observer) (Cont.)

Wavelength (nm)

x(l)

0.0468

y(l)

0.0170

z(l)

680

685

690

695

700

0.0000

0.0329

0.0227

0.0158

0.0114

0.0119

0.0082

0.0057

0.0041

705

710

715

720

725

0.0081

0.0058

0.0041

0.0029

0.0020

0.0029

0.0021

0.0015

0.0010

0.0007

0.0000

730

735

740

745

750

0.0014

0.0010

0.0007

0.0005

0.0003

0.0005

0.0004

0.0002

0.0001

0.0000

755

760

765

770

775

780

0.0002

0.0001

0.0000

0.0001

0.0000

Totals:

21.3714

21.3711

21.3715

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Appendix C: Chromaticity Reference

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Glossary and

Index

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Glossary

Area Source

A lightsource of large angular size.

Blackbody (Planckian Radiator)

A thermal lightsource having lightproduced by

heating. The intensity and color of a blackbody are

primarily dependent on operating temperature.

Chromaticity

The quality of color. Based on wavelength distribuĆ

tion and purity.

Color Temperature

The absolute temperature, in Kelvin, of a blackbody

required to produce an equivalent chromaticity

from a lightsource.

Correlated Color Temperature

The absolute temperature of a blackbody required

to most closely match the chromaticity of a light

source.

Illuminance

The amountof luminous flux received by a unitof

surface area. Usually measured in lux (lumens/meĆ

ter ) or footꢀcandles with a sensor spectrally

matched to the average human eye.

Inverse Square Law

The falloff of light with distance; light varies inverseĆ

ly with the square of the distance from the source.

Irradiance

The amountof radiantflux received by a unitof

surface area. Usually measured in watts/meter or

watts/cm with a sensor having equal spectral

sensitivity to the wavelengths being measured.

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Glossary

Isotropic Source

A lightsource thatemits lightuniformly in all direcĆ

tions.

Luminance

The amount of light emitted or scattered by a

surface. Usually measured in candelas/meter

(nits)or footĆlamberts with a sensor spectrally

matched to the average human eye.

Luminous Flux

The total light from a source, measured in lumens

with a sensor spectrally matched to the average

human eye.

Luminous Intensity

The luminous flux through a unit of solid angle.

Usually measured in candelas (lumens/steradian)

with a sensor spectrally matched to the average

human eye.

Photometry

Measurementof lightas seen by the human eye.

Photopic Correction

The correction of a sensor to match the CIE sensiĆ

tivity function of the average human eye.

Point Source

A lightsource of small angular size, such thatlight

appears to come from a point.

Radiance

The amount of radiant energy emitted or scattered

by a surface. Usually measured in watts/meĆ

ter /steradian with a sensor having equal spectral

sensitivity to all wavelengths being measured.

Radiant Flux

The total radiation from a source, measured in

watts with a sensor having equal spectral sensitivity

to the wavelengths being measured.

G-2

Glossary and Index

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Glossary

Radiant Intensity

The radiant flux through a unit of solid angle. UsualĆ

ly measured in watts/steradian with a sensor having

equal spectral sensitivity to the wavelengths being

measured.

Radiometry

The measurement of radiant power. A radiometric

sensor is equally sensitive to all wavelengths presĆ

ent in the light being measured.

Reflectance Factor

The ratio of reflected light to received light on a

surface.

Tristimulus Values (X,Y,Z)

The amounts of each of three color primaries

required to match the color of a light.

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Glossary

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Glossary and Index

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Index

AC Adapter, 1Ć9

Cable, RSĆ232, 3-1

Accessories, 1Ć3

optional, 7-6, A-1

ordering, 7-1

Calibration, 1Ć5, 6-2