HP HP 81531A User manual

User's Guide

HP 81531A Sensor Module

SERIAL NUMBERS

This manual applies to all instruments.

ABCDE

HP Part No. 81531-90011

Printed in Germany

Second Edition

E0796

Control Serial Number: Edition 2 applies directly to all instruments.

Edition 1 : 1st May 1990 : 81531-90011 : E0590

1st September 1990 : 81531-90011 : E0990

Edition 2 : 1st September 1991 : 81531-90011 : E0991

1st September 1992 : 81531-90011 : E0992

1st December 1994 : 81531-90011 : E1294

1st July 1996: 81531-90011 : E0796

Safety Considerations

Before operation, you should review the instrument and manual, including the

red safety page, for safety markings and instructions.You must follow these to

ensure safe operation and to maintain the instrument in safe condition.

Initial Inspection

Inspect the shipping container for damage. If there is damage to the container

or cushioning, you should keep it until you have checked the contents of the

shipment for completeness and veried the module both mechanically and

electrically.

The Performance Tests give procedures for checking the operation of the

module. If the contents are incomplete, mechanical damage or defect is

apparent, or if a moduke does not pass the operator's checks, notify the nearest

Hewlett-Packard oce.

Warning

To avoid hazardous electrical shock, do not perform

electrical tests when there are signs of shipping damage to

any portion of the outer enclosure (covers, panels, etc.).

Power Requirements

The HP 81531A operates when installed into the HP 8153A Optical Multimeter

mainframe.

Operating Environment

The HP 8153A safety information summarizes the HP 81531A operating

environment ranges. In order for the HP 81531A to meet specications, the

operating environment must be within the limits specied in this section.

Input/Output Signals

iii

Caution

A maximum of 15V can be applied as an external voltage to any

BNC connectors.

Storage and Shipment

The module can be stored or shipped at temperatures between



C and

+70



C. The module should be protected from temperature extremes that may

cause condensation within it.

Contents

C. HP 81531A Specications

Supplementary Performance Characteristics . . . . . . . . . . . C-3

Analog output: .... .. .. .. .. .. .. .. .. .. . C-3

D. Performance Tests

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Equipment Required . . . . . . . . . . . . . . . . . . . . . D-1

Test Record .......................... D-2

Test Failure .......................... D-2

Instrument Specication .... .. .. .. .. .. .. .. .. D-2

Performance Test .... .. .. .. .. .. .. .. .. .. . D-3

Accuracy and Linearity Test .... .. .. .. .. .. .. . D-3

Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . D-3

I. Accuracy Test ...................... D-4

II. Linearity Test...................... D-5

III. Noise Test .. .. .. .. .. .. .. .. .. . .. .. . D-8

E. Cleaning Procedures

The Cleaning Kit . . . . . . . . . . . . . . . . . . . . . . . . E-1

Other Cleaning Tools . . . . . . . . . . . . . . . . . . . . . E-3

Preserving Connectors . . . . . . . . . . . . . . . . . . . . . E-4

Cleaning Instrument Housings ................. E-4

Correct Cleaning Procedure .... .. .. .. .. .. .. .. E-5

Cleaning Cable Connectors . . . . . . . . . . . . . . . . . . E-5

Cleaning Connector Adapters . . . . . . . . . . . . . . . . . E-6

Cleaning Connector Interfaces ................ E-6

How to clean instruments with a recessed lens interface . . . . E-7

Light dirt .. .. .. .. .. .. .. .. .. .. . .. .. E-7

Heavy dirt ........................ E-7

Index

Contents-1

Figures

D-1. Accuracy and Linearity Test Setup .............. D-4

D-2. Addition of results (example) . . . . . . . . . . . . . . . . . D-7

Contents-2

HP 81531A Specications

Specications describe the instrument's warranted performance. Supplementary

performance characteristics describe the instrument's non-warranted typical

performance.

Because of the modular nature of the instrument, these performance

specications apply only to this module.You should insert these pages into the

appropriate section of the manual.

HP 81531A Specications C-1

HP 81531A Specications

Sensor Element

In GaAs

Wavelength range

800-1700nm

Power range

+3 to -90dBm

Display resolution

dBm, dB 0.001

0.0001 on printout

Watt 0.01 to 10

(depending on power range)

Applicable ber type

9/125



m - 100/140



m, NA



0.3

Uncertainty (Accuracy)

2.5% (1000-1650nm)

[1]

Total Uncertainty

1.5pW (1000-1650nm)

[2]

Linearity

(0 to -70dBm)



Cto28



C const. temp

0.015dB

1pW



Cto55



C const. temp

0.05dB

1.5pW

Noise

1.5pW (1200-1600nm)

peak-peak, avg. time 1sec

Dimensions

75mm H, 32mm W, 335mm D (2.8

1.3

13.2

)

Weight

net 0.6kg (1.3lbs), shipping 1kg (2.2lbs)

Recalibration period

2 years

Warmup time

20 min.

Information on the traceability of power meters is available on request

[1] at the following reference conditions:

Power level 10



W (-20dBm), Continuous Wave (CW).

Fiber 50



m graded index, NA=0.2, fully excited.

Ambient temperature 23



5K.

Connector Diamond HMS-10/HP.

At day of calibration (add 0.3% for aging over one year, add 0.6% over

two years).

Spectral width of source

10nm.

[2] at the following operating conditions:

Fiber





m, NA



0.2.

For NA

0.2 add 1%.

C-2 HP 81531A Specications

Ambient temperature 0 to 55



C, non-condensing.

Within 1 year after calibration, add 0.3% for second year.

For Biconic Connector add

1%.

Supplementary Performance Characteristics

Add 1% to total uncertainty for the full wavelength range

Outside the specied wavelength range, the noise increases by up to 5 times

the value shown above.

Analog output:

Bandwidth:



DC,



300 to 400Hz, depending on range and sensor module.

Output voltage: 0 to 2V into open.

Output impedance: 600 typical.

Max. input voltage:

10V.

HP 81531A Specications C-3

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