HP 432A power meter OPERATING AND SERVICE MANUAL

OPERATING AND SERVICE MANUAL

HP 432A

POWER METER

SERIAL NUMBERS

For important information about serial numbers see

INSTRUMENT IDENTIFICATION in Section

I.

Manual Part No. 00432-90079

Table of Contents Model 432A

Section

I

Page

GENERAL INFORMATION. . . . . . . . . . . . . 1-1

1-1.

Description . . . . . . . . . . . . . . . . . . . . . 1-1

1-5.

Instrument Identification. . . . . . . . . . 1-1

1-7.

Operating Environment . . . . . . . . . . . 1-3

1-11.

Cooling Requirements . . . . . . . . . 1-3

1-13.

Cleaning . . . . . . . . . . . . . . . . . . . . 1-3

II

III

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . 2-1

2-1.

Initial Inspection. . . . . . . . . . . . . . . . . 2-1

2-2.

2-4.

Mechanical Check . . . . . . . . . . . . 2-1

Performance Checks . . . . . . . . . . 2-1

2-6.

Damage Claims . . . . . . . . . . . . . . 2-1

2-9.

Three-Conductor Power Cable . . . . . . 2-1

2-12. Primary Power Requirements . . . . . . 2-1

2-14. Internal Battery Operation . . . . . . . . 2-1

2-16.

2-17.

Battery Installation. . . . . . . . . . . 2-1

Battery Storage . . . . . . . . . . . . . . 2-1

2-19. Rack Mounting . . . . . . . . . . . . . . . . . . 2-1

2-21.

Combining Case. . . . . . . . . . . . . . 2-1

2-23.

Adapter Frames . . . . . . . . . . . . . . 2-2

2-25. Repacking for Shipment . . . . . . . . . . . 2-2

OPERATING INFORMATION. . . . . . . . . . . 3-1

3-1.

Introduction. . . . . . . . . . . . . . . . . . . . . 3-1

3-4.

Controls, Connectors and Indicators . 3-1

3-12. Battery Operation. . . . . . . . . . . . . . . . 3-1

3-17. Microwave Power Measurement

Accuracy . . . . . . . . . . . . . . . . . . . . 3-2

3-23. Calibrator Factor and Effective

Efficiency . . . . . . . . . . . . . . . . . . . 3-2

3-27. Precision Power Measurement. . . . . . 3-2

3-28.

3-30.

General. . . . . . . . . . . . . . . . . . . . . 3-2

Measurement Procedure . . . . . . . 3-2

IV

V

PRINCIPLES OF OPERATION . . . . . . . . . . 4-1

4-1.

Simplified Description . . . . . . . . . . . . 4-1

4-5.

Functional Block Diagram . . . . . . . . . 4-1

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . 5-1

5-1.

Introduction. . . . . . . . . . . . . . . . . . . . . 5-1

5-3.

Content . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5-4.

5-6.

5-10.

5-12.

Performance Tests . . . . . . . . . . . . 5-1

Adjustments. . . . . . . . . . . . . . . . . 5-1

Test Equipment . . . . . . . . . . . . . . 5-1

Service Information . . . . . . . . . . . 5-1

TABLE OF CONTENTS

Section

V

Page

MAINTENANCE (Cont)

5-14. 432A Performance Tests with

8477A Calibrator . . . . . . . . . . . . . . . 5-1

5-15.

5-16.

5-17.

5-18.

Initial Setup . . . . . . . . . . . . . . . . . 5-1

Meter Accuracy Test . . . . . . . . . . 5-1

Calibration Factor Test . . . . . . . . 5-2

Meter Linearity Check. . . . . . . . . 5-2

5-19.

5-20.

5-21.

Zero Carryover Test. . . . . . . . . . . 5-2

Fine Zero Range Check . . . . . . . . 5-3

432A Calibration Without

8477A Calibrator . . . . . . . . . . . 5-3

5-24.

5-26.

Calibration Procedure 1. . . . . . . . 5-3

Calibration Procedure 2. . . . . . . . 5-9

5-27. Cover Removal and Replacement. . . . 5-9

5-29.

Top Cover Removal . . . . . . . . . . . 5-9

5-30.

5-31.

Top Cover Replacement. . . . . . . . 5-9

Bottom Cover Removal . . . . . . . . 5-9

5-32.

Bottom Cover Replacement. . . . . 5-9

5-33. Adjustment Procedures. . . . . . . . . . . 5-10

5-34.

5-35.

5-36.

5-37.

Initial Setup . . . . . . . . . . . . . . . . 5-10

Mechanical Meter

Adjustment . . . . . . . . . . . . . . 5-10

Bridge Amplifier Tests. . . . . . . . 5-10

5-38.

Meter and Recorder Output

Calibration. . . . . . . . . . . . . . . 5-10

Battery Charger Adjustment

(Option 01 Only) . . . . . . . . . . 5-11

5-39.

Battery Removal . . . . . . . . . . . . 5-11

5-40. Isolating Trouble in Transistor

5-46.

Circuits . . . . . . . . . . . . . . . . . . . . 5-11

Out-of-Circuit Testing . . . . . . . . 5-13

5-48. Component Replacement in

Etched Circuits . . . . . . . . . . . . . 5-13

5-50.

5-52.

Axial-Lead Components . . . . . . 5-13

Other Components. . . . . . . . . . . 5-14

VI

VII

REPLACEABLE PARTS . . . . . . . . . . . . . . . . 6-1

6-1.

Introduction. . . . . . . . . . . . . . . . . . . . . 6-1

6-3.

Ordering Information . . . . . . . . . . . . . 6-1

TROUBLESHOOTING, SCHEMATICS,

AND COMPONENT LOCATIONS . . . . . 7-1

7-1.

Introduction. . . . . . . . . . . . . . . . . . . . . 7-1

7-5.

Troubleshooting. . . . . . . . . . . . . . . . . . 7-1

7-8.

Schematics. . . . . . . . . . . . . . . . . . . . . . 7-1

7-12. A1A1 Auto Zero Assembly . . . . . . . . . 7-1

7-14. Test Conditions . . . . . . . . . . . . . . . . . . 7-1 ii

Model 432A List of Tables

List of Illustrations

LIST OF TABLES

5–6.

5–7.

6–1.

6–2.

7–1.

Number

1–1.

1–2.

5–1.

5–2.

5–3.

5–4.

5–5.

Title Page

Specifications . . . . . . . . . . . . . . . . . . . . . . . . 1–1

Thermistor Mounts for the 432A . . . . . . . . . 1–2

Recommended Test Equipment . . . . . . . . . . 5–0

Meter Accuracy Test . . . . . . . . . . . . . . . . . . . 5–2

Calibration Factor Test . . . . . . . . . . . . . . . . 5–2

Performance Test Card. . . . . . . . . . . . . . . . . 5–5

Out-of-Circuit Transistor Resistance

Measurements . . . . . . . . . . . . . . . . . 5–11

Etched Circuit Soldering Equipment. . . . . 5–13

Safe Ohmmeter Range for Transistor

Resistance Measurements . . . . . . . . 5–14

Replaceable Parts . . . . . . . . . . . . . . . . . . . . . 6–2

Code List of Manufacturers . . . . . . . . . . . . . 6–6

Schematic Notes . . . . . . . . . . . . . . . . . . . . . . 7–2

Number Title Page

7–2.

7–3.

7–4.

7–5.

7–6.

Overall Troubleshooting. . . . . . . . . . . . . . . . 7–5

RF Bridge Troubleshooting . . . . . . . . . . . . . 7–6

Compensation Bridge Troubleshooting . . . . 7–6

Auto-Zero Troubleshooting. . . . . . . . . . . . . . 7–7

7–7.

7–8.

7–9.

Chopping and Summing Circuit

Troubleshooting . . . . . . . . . . . . . . . . . 7–7

5 kHz Multivibrator Troubleshooting . . . . . 7–7

Range Amplifier Troubleshooting . . . . . . . . 7–7

Calibrator Factor Amplifier

Troubleshooting . . . . . . . . . . . . . . . . . 7–7

7–10.

Pulse Width Modulator and Meter

Troubleshooting . . . . . . . . . . . . . . . . . 7–7

7–11.

Battery Charger Troubleshooting . . . . . . . . 7–9

7–12.

Power Supply Troubleshooting . . . . . . . . . . 7–9

LIST OF ILLUSTRATIONS

Number

1–1.

1–2.

2–1.

2–2.

3–1.

3–2.

3–3.

3–4.

4–1.

4–2.

4–3.

4–4.

4–5.

5–1.

5–2.

5–3.

5–4.

Title Page

HP Model 432A Power Meter. . . . . . . . . . . . 1–0

Instrument Identification. . . . . . . . . . . . . . . 1–1

Sub-module Installation in Rack Adapter

Frame . . . . . . . . . . . . . . . . . . . . . . . . . 2–2

HP Model 1051A Combining Case

Instrument Installation. . . . . . . . . . . 2–2

Precision Power Measurements. . . . . . . . . . 3–3

Front Panel Controls, Connectors and

Indicators . . . . . . . . . . . . . . . . . . . . . . 3–4

Rear Panel Controls and Connectors. . . . . . 3–6

Turn On and Zeroing Procedure . . . . . . . . . 3–8

Model 432A Simplified Block Diagram . . . . 4–0

Model 432A Block Diagram . . . . . . . . . . . . . 4–3

Model 432A RF Bridge Talking

Schematic . . . . . . . . . . . . . . . . . . . . . . 4–4

Model 432A Meter Logic Talking

Schematic . . . . . . . . . . . . . . . . . . . . . . 4–6

Model 432A Power Supply Talking

Schematic . . . . . . . . . . . . . . . . . . . . . . 4–8

Check and Adjustment Test Setup . . . . . . . 5–1

Zero Carryover Test Setup . . . . . . . . . . . . . . 5–3

Bridge Amplifier Test . . . . . . . . . . . . . . . . . 5–10

Transistor Biasing and Operating

Characteristics . . . . . . . . . . . . . . . . . 5–12

Number Title Page

7–1.

7–2.

7–3.

7–4.

7–5.

7–6.

7–7.

Servicing Block Diagram . . . . . . . . . . . . . . . 7–3

Model 432A Top Internal View . . . . . . . . . . 7–4

Model 432A Waveforms . . . . . . . . . . . . . . . . 7–4

Model 432A Test Point Locations . . . . . . . . 7–5

Model 432A Bottom View, Component

Locations . . . . . . . . . . . . . . . . . . . . . . 7–6

Model 432A Front Panel Interior. . . . . . . . . 7–6

A1 Bridge Assembly, Component

7–8.

7–9.

Locations . . . . . . . . . . . . . . . . . . . . . 7–10

Model 432A Rear Panel Interior . . . . . . . . 7–10

RF and Compensation Bridge

Schematic Diagram . . . . . . . . . . . . . 7–11

7–10.

Model 432A Switches . . . . . . . . . . . . . . . . . 7–12

7–11.

A2 Meter Logic Assembly, Component

Locations . . . . . . . . . . . . . . . . . . . . . 7–13

7–12.

Meter Logic Schematic Diagram . . . . . . . . 7–13

7–13.

A2 Meter Logic Assembly, Power Supply

Component Locations . . . . . . . . . . . 7–15

7–14.

A7 Battery Charging Circuit (Option 01)

Component Locations . . . . . . . . . . . 7–15

7–15.

Power Supply, Schematic Diagram . . . . . . 7–15

7–16.

Thermistor Cable Wiring Diagram . . . . . . 7–16 iii

Regulatory Information

Declaration of Conformity

according to ISO/IEC Guide 22 and EN45014

Manufacturer’s Name:

Manufacturer’s Address:

Hewlett-Packard Ltd.

Queensferry Microwave Division

South Queensferry

West Lothian, EH30 9TG

Scotland, United Kingdom

Declares that the product

Product Name:

Model Numbers:

Product Options:

Thermistor Power Meter

HP 432A

This declaration covers only the standard option of the above product.

Conforms with the protection requirements of European Council Directive 89/336/EEC on the approximation of the laws of the member states relating to electromagnetic compatibility.

Against EMC test specifications EN 55011:1991 (Group 1, Class A) and EN 50082-1:1992

As Detailed in:

Electromagnetic Compatibility (EMC)

Technical Construction File (TCF) No. A-5951-9852-02

Assessed by:

DTI Appointed Competent Body

EMC Test Centre,

GEC-Marconi Avionics Ltd.,

Maxwell Building,

Donibristle Industrial Park,

KY11 5LB

Scotland, United Kingdom

Technical Report Number:6893/2200/CBR, dated 23 September 1997

Supplementary Information:

The product conforms to the following safety standards:

EN 61010-1(1993) / IEC 1010-1(1990) +A1(1992) +A2(1994)

CSA-C22.2 No. 1010.1-93

The product herewith complies with the requirements of the Low Voltage Directive 73/23/EEC, and carries the CE-marking accordingly.

South Queensferry, Scotland 17 November 1997

Location

Date R.M. Evans / Quality Manager

Model 432A iv

Model 432A

Warranty

Regulatory Information

This Hewlett-Packard product is warranted against defects in materials and workmanship for a period of one year from date of shipment. During the warranty period, Hewlett-Packard

Company will, at its option, either repair or replace products which prove to be defective.

For warranty service or repair, this product must be returned to a service facility designated by

HP. Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties, and taxes for products returned to HP from another country.

HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument. HP does not warrant that the operation of the instrument, or software, or firmware will be uninterrupted or error free.

Limitation of Warranty

The foregoing warranty shall not apply to defects resulting from:

1

Improper or inadequate maintenance, adjustment, calibration, or operation by Buyer;

2

Buyer-supplied software, hardware, interfacing or consumables;

3

Unauthorized modification or misuse;

4

Operation outside of the environmental and electrical specifications for the product;

5

Improper site preparation and maintenance; or

6

Customer induced contamination or leaks.

THE WARANTY SET FORTH IS EXCLUSIVE AND NO OTHER WARRANTY, WHETHER

WRITTEN OR ORAL, IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

PURPOSE.

Limitation of Remedies and Liability

THE REMEDIES PROVIDED HEREIN ARE BUYER'S SOLE AND EXCLUSIVE REMEDIES.

IN NO EVENT SHALL HP BE LIABLE FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,

OR CONSEQUENTIAL DAMAGES (INCLUDING LOSS OF PROFITS) WHETHER BASED ON

CONTRACT, TORT OR ANY OTHER LEGAL THEORY.

Responsibilities of the Customer

The customer shall provide:

1

Access to the products during the specified periods of coverage to perform maintenance.

2

Adequate working space around the products for servicing by Hewlett-Packard personnel.

3

Access to and use of all information and facilities determined necessary by Hewlett-Packard to service and/or maintain the products. (Insofar as these items may contain proprietary or classified information, the customer shall assume full responsibility for safeguarding and protection from wrongful use.)

4

Routine operator maintenance and cleaning as specified in this manual.

5

Consumables such as paper, disks, magnetic tapes, ribbons, inks, pens, gases, solvents, lamps, filters, fuses, seals, etc.

v

Regulatory Information

Certification

Model 432A

Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment from the factory. Hewlett-Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed by the

Bureau's calibration facility, and to the calibration facilities of other International Standards

Organization members.

Assistance

Product maintenance agreements and other customer assistance agreements are available for

Hewlett-Packard products.

For any assistance, contact your Hewlett-Packard Sales and Service Office. Addresses are provided at the back of this manual.

Notice

The information contained in this document is subject to change without notice.

Hewlett-Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance or use of this material.

This document contains proprietary information which is protected by copyright. All rights are reserved. No part of this document may be photocopied or reproduced without the prior written consent of the manufacturer, Hewlett-Packard Ltd.

Restricted Rights Legend

Use, duplication, or disclosure by the government is subject to restrictions as set forth in subdivision (b)(3)(ii) of the Rights in Technical Data and Computer Software clause at 52.227-

7013. Hewlett-Packard Company; 3000 Hanover Street; Palo Alto, California 94304.

Statement of Compliance

Electromagnetic

Compatibility (EMC)

Information

This product has been designed to meet the protection requirements of the European

Communities Electromagnetic Compatibility (EMC) directives:

EN55011:1991 (Group 1, Class A)

EN50082-1:1992

- IEC 1000-4-2 (1995) ESD

- IEC 1000-4-3 (1995) Radiated Suseptibility

- IEC 1000-4-4 (1995) EFT

In order to preserve the EMC performance of the product, any cable which becomes worn or damaged must be replaced with the same type and specification.

Safety Information

This instrument has been designed and tested in accordance with publication EN61010-1(1993) /

IEC 1010-1(1990) +A1(1992) +A2(1994) / CSA C22.2 No. 1010.1(1993) Safety Requirements for

Electrical Equipment for Measurement, Control and Laboratory Use, and has been supplied in a safe condition. The instruction documentation contains information and warnings which must be followed by the user to ensure safe operation and to maintain the instrument in a safe condition.

vi

Model 432A

General Safety

WA R N I N G

Regulatory Information

The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Hewlett-Packard Company assumes no liability for the customer’s failure to comply with these requirements.

This is a Safety Class I instrument (provided with a protective earthing ground, incorporated in the powercord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact. Any interruption of the protective conductor inside or outside of the instrument is likely to make the instrument dangerous.

Intentional interruption is prohibited.

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

DO NOT use repaired fuses or short-circuited fuseholders: For continued protection against fire, replace the line fuse(s) only with fuse(s) of the same voltage and current rating and type.

DO NOT perform procedures involving cover or shield removal unless you are qualified to do so:

Operating personnel must not remove equipment covers or shields. Procedures involving the removal of covers and shields are for use by service-trained personnel only.

DO NOT service or adjust alone: Under certain conditions, dangerous voltages may exist even with the equipment switched off. To avoid dangerous electrical shock, service personnel must not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.

DO NOT operate damaged equipment: Whenever it is possible that the safety protection features built into this product have been impaired, either through physical damage, excessive moisture, or any other reason, REMOVE POWER and do not use the product until safe operation can be verified by service-trained personnel. If necessary, return the product to a Hewlett-Packard Sales and Service Office for service and repair to ensure the safety features are maintained.

DO NOT substitute parts or modify equipment: Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modification to the product.

Return the product to a Hewlett-Packard Sales and Service Office for service and repair to ensure the safety features are maintained.

vii

viii

Regulatory Information

Safety Symbols

Model432A

The following symbols on the instrument and in the manual indicate precautions which must be taken to maintain safe operation of the instrument.

Sa

f

ety Sym

bol

s

The Instruction Documentation Symbol. The product is ~ refer this symbol to when it is necessary for the the instructions in the supplied documentation.

@

Indicates the field wiring terminal that must be connected to earth ground before operating the equipment protects against electrical shock in case of fault.

rh

OR

J_

Frame or chassis ground terminal - typically connects to the equipment's metal frame.

~ current (AC )

---

Direct current ( D C )

A

Indicates hazardous voltages

WARNING Warning denotes a hazard.

It calls attention to a procedure which, if not correctly performed or adhered to, could result in injury or loss of life. Do not proceed beyond a warning note until the indicated conditions are fully understood and met.

CAUTION

Caution denotes a hazard.

It calls attention to a procedure which, if not correctly performed or adhered to, could result in dan1age to or destruction of the instru ment. D o not proceed beyond a caution note until the indicated conditions are fully understood and met.

(

E

I SM 1-A

The CE mark shows that the product complies with all relevant European Legal D irectives.

This is a symbol of an I ndustrial, Scientific, and Medical

Group 1 Class A product.

<ti ·

The CSA mark is a registered trademark of the Cana dian Standards Association, and indicates compliance to the standards layed out by them.

Model 432A

Noise Declaration

LpA<70dB am Arbeitsplatz (operator position) normaler Betrieb (normal position) nach DIN 45635 pt.19 (per ISO 7779)

Regulatory Information ix

Section

I

\

I

I

\

'

,

~

,

\

\

~

I

• J dBm

.

,

.

,

1

--<

I

/

'

J

,

/

Model 432A

\

1-0

Figure 1-

1. H

P Model 432A

P

o

w

e

r

M

et

e

r

Model 432A Section I

SECTION I

GENERAL INFORMATION

1-1. DESCRIPTION.

1 2. The Hewlett-Packard Model 432A Power Meter , with HP temperature compensated thermistor mounts , measures RF power from 10 microwatts ( 20 dBm ) to 10 milliwatts ( + 10 dBm ) full scale with 1 % of full scale accuracy from 10 M H z to 40 G H z. With a selector switch , the instrument normalizes the power meter reading to compensate for the Callibration Factor of a thermistor mount used for a given measurement. For portable operation , Option 01 instruments have a rechargeable nickel-cadmium battery. See Table 1 1 for complete specifications.

1-3 . The Model 432A ha s provi s ion for de substitution measm·ements and for power meter calibration. An output is provided for recorders or digital voltmeter readout.

1--4 . Acce ss orie s . Two accessories are supplied with the Model

432A Power Meter: a 7.5-foot ( 2290 mm ) detachable power cable and a 5-foot (1520 mm ) cable that connects the thennistor motmt to the meter. Thenni s tor mount s are available but not s upplied w ith the Po w er Meter ( refer to Table 1-2 ) . Table 1-1 li s t s those accessories s upplied and also those available.

1

-5

. INSTRUMENT IDENTIFICATION.

1-6 . Hewlett-Packard instruments are identified by an

8 or

10digit serial number. The first four digit s are the Serial Prefix. To properly match a manual with the instrument to which it applie s , the prefix on the instrument mu s t be the s ame as the prefix at the front of the manual. If the munbers are different , informa t ion is supplied either on yellow Manual Change Supplement s, or in an

Appendix in the Manual. If the change info1ma t ion is ini ss ing, contact your HP S ales Office ( Sale s Office s are li s ted at the back of the Manual ) .

0

SERIAL PREFIX

\

HEW L EIT

-~CKARD

COMPANY

[S

ER.

--'-

1234A98765

Jo

MADE IN U .

S.A.

Figure 1-2. Instrument Identification

Table 1 1. Specifications lnstrun1ent Type: Automatic , self-balancing power meter for use with temperature-compensated thermistor mount.

Power Range: 7 ranges with full-scale readings of 10 , 30 ,

100 , and 300 µW , 1 , 3 and 10 mW ; also calibrated in dBm from 20 dBm to +10 dBm full scale in 5-dB steps.

Accuracy : ±1 % offull scale on all ranges ( + o · c to +55 .

C ) .

Fine Zero : Automatic , operated by toggle switch .

Recorder Output: 1.000 volt into open circuit corresponds to full-scale meter deflection ( 1.0 on 0 - 1 scale ) ± 0.5

% ; 1000-ohm output impedance, BNC connector.

RF I : Meets all conditions specified in M IL -l 6161D .

Calibration normalizes meter reading to account for thermistor mount Calibration Factor.

Range : 100

Factor

% to 88 %

Control: in 1 % steps.

13 position switch

Thermistor Mount: External temperature-compensated thermistor mounts required for operation ( see Table

1-2 ) .

Power: 115 or 230 Vac ±10%, 48 to 440 Hz,

13 VA ( max ) . Optional rechargeable battery provides up to 20 hours continuous operation. Automatic battery recharge .

Weight: Net 6 112 lb ( 3 kg ) .

Weight with Optional Battery Pack: Net 9-1/4 lb ( 4.2 kg ) .

Meter: Taut-band suspension , individually computercalibrated , mirror backed scales . Milliwatt scale more than 4-1/4 inches ( 108 mm ) long.

Zero Carryover: Less than ±0 .

5 % of full scale when zeroed on most sensitive range.

Environmental:

Operating

EMC:

Temperature:

Storage Temperature:

Humidity: Up to

0 to

-20 to +60

95% Relative

Meets EN55011:1991

EN50082 1.

(

+55

'

.

C.

C.

Humidity

Group 1 , at 4o·c

Class A

.

), and

1-1

Section I

Model 432A

Dimensions:

NOTE

OtMEMSIONS itrt

IHOES AHO lMILL!MtTE!tSl

!Al f"OA TOTAL

1.EHGTH !HCl..U()OrtG

l(tf(IU

AOC

I IN;.

(2' MM! tB! F"Oflf K€1GH'r

lNCUJOOtl'l FUT

Al» 1/16 tN. Ill MM!

REAR

SIDE

,.,

Le.....

~~---"1._.L f.

I-

Accessories Furnished: 5-ft ( 1, 42 m) cable for HP temperature compensated thermistor mounts; 7-

1/2 ft

(2,29 m) power cable,

NEMA plug.

Accessories Available:

00432-6016 Rechargeable Battery Pack for field installation.

5060-0797 Rack Adapter Frame (holds three instruments the size of the 432A).

8477A Power Meter Calibrator.

11076A Carrying Case.

Table 1-1. Specifications (Cont.)

TOP

Combining Cases:

1051A, 11-1/4 in. (286 mm) deep.

1052A, 16-3/8 in. (416 mm) deep.

The combining cases accept the 1/3-module HP instruments for bench use or rack mounting. See

1051A data sheet for details.

Options:

001: Rechargeable battery installed, provides up to 20 hours continuous operation.

002: Rear thermistor mount input connector wired in parallel with front panel input connector.

003: Input connector placed on rear panel instead of front.

Note

Thermistor mount cable impedance is part of the 432A input bridge circuit. For cables

20 feet long and over, the bridge is matched to specific cable options, so the various cables should not be interchanged.

009: 10-foot (3, 05 m) cable for 100-ohm or 200ohm mount.

010: 20-foot (6, 10 m) cable for 100-ohm or 200ohm mount.

011: 50-foot (15,24 m) cable for 100-ohm or 200ohm mount.

012: 100-foot (30,48 m) cable for 100-ohm or 200ohm mount.

013:200-foot (60,96 m)cable for 100-ohm or 200ohm mount.

1-2

Table 1-2. Thermistor Mounts for the 432A

Operating Resistance (Ohms) HP Model Frequency Range (GHz)

COAXIAL MOUNTS:

478A (Type N Connector)

8478B (Type N Connector)

8478B-0ption 11 (APC-7 Connector)

0.01-10

0.01-18

0.01-18

WAVEGUIDE MOUNTS:

S486A

G486A

J486A

H486A

X486A

M486A

P486A

K486A

R486A

WAVEGUIDE MOUNT ACCESSORIES:

11515A: Circular Flange Adapter for K486A.

11516A: Circular Flange Adapter for R486A.

2.6-3.95

3.95-5.85

5.3-8.2

7.05-10

8.2-12.4

10-15

12.4-18

18-26. 5

26. 5-40

200

200

200

100

100

100

100

100

100

100

200

200

Model 432A

1-7.

OPERATING ENVIRONMENT.

1–8. This instrument is designed for indoor use only.

1–9. The module may be operated at temperatures from

0

˚

C to 55

˚

C at altitudes of up to 4,600 m (15,000 ft). The module may be operated in environments up to 95% relative humidity to 40

˚

C, but it should be protected from temperature extremes which may cause condensation.

1–10. To ensure adequate cooling do not obstruct air vents in the instrument cabinet.

1–11. COOLING REQUIREMENTS.

1–12. To provide adequate cooling, an air gap of approximately 75 mm should be maintained around the instrument.

NOTE If the HP 432A is subject to HP Class B condensation it is recommended that the instrument be powered up for at least 30 minutes before normal operation is possible.

CAUTION This instrument is designed for use in

Installation Category II and Pollution

Degree 2 per IEC 1010-1 and 644 respectively.

1–13. CLEANING.

1–14. To clean the module/instrument: Use a soft, clean damp cloth to clean the front panel and side covers.

Section I

CAUTION Mains supply voltage fluctuations should not exceed ±10% of the nominal selected line voltage.

CAUTION Before switching on this instrument, make sure that the line voltage slide switch is set to the voltage of the power supply, and the correct fuse is installed (see Figure 3–3).

Ensure the power supply voltage is in the specified range.

WARNING Appliance coupler (mains input powercord) is the power disconnect device. Do not position the instrument such that access to the coupler is impaired.

WARNING For continued protection against fire hazard, replace the line fuse only with the same type and line rating

(T100 mA 250 V). The use of other fuses or materials is prohibited.

WARNING If this instrument is not used as specified, the protection provided by the equipment could be impaired.

This instrument must be used in a normal condition only (in which all means for protection are intact).

WARNING No operator serviceable parts inside.

Refer servicing to qualified personnel. To prevent electrical shock do not remove covers.

1-3

Model 432A Section II

Installation

SECTION II

INSTALLATION

WARNING If this instrument is not used as specified, the protection provided by the equipment could be impaired. This instrument must be used in a normal condition only (in which all means for protection are intact).

2-1.

INITIAL INSPECTION.

2–2. MECHANICAL CHECK.

2–3. If damage to the shipping carton is evident, ask that the carrier’s agent be present when the instrument is unpacked. Inspect the instrument for mechanical damage. Also check the cushioning material for signs of severe stress.

2–4. PERFORMANCE CHECKS.

2–5. The electrical performance of the Model 432A should be verified upon receipt. Performance checks suitable for incoming inspection are given in Section V,

Maintenance.

2–6. DAMAGE CLAIMS.

2–7. If the instrument is mechanically damaged in transit, notify the carrier and the nearest Hewlett-

Packard field office immediately. A list of field offices is at the back of this manual. Retain the shipping carton and padding material for the carrier’s inspection. The field office will arrange for replacement or repair of your instrument without waiting for claim settlements against the carrier.

2–8. Before shipment this instrument was inspected and found free of mechanical and electrical defects. If there is any deficiency, or if electrical performance is not within specifications, notify your nearest Hewlett-

Packard Sales and Service Office.

2-9.

THREE-CONDUCTOR POWER CABLE.

2–10. To protect operating personnel, the National

Electrical Manufacturers Association (NEMA) recommends that the instrument panel and cabinet be grounded. All Hewlett-Packard instruments are equipped with a three-conductor power cable which, when plugged into an appropriate receptacle, grounds the instrument. The offset pin on the power cable threeprong connector is the ground wire.

2–11. To preserve the protection feature when operating the instrument from a two-connector outlet, use a three-prong to two-prong adapter and connect the green pigtail on the adapter to ground.

2-12.

PRIMARY POWER REQUIREMENTS.

2–13. The Model 432A operates from 115 or 230 volts ac line voltage. Line frequency may vary from 48 to 440 Hz.

A slide switch on the rear panel is moved to the correct position for the line voltage available. Before operating the equipment, ensure that the fuse installed in the instrument corresponds to the value marked on the panel for the line voltage available (1/8 amp slo-blow).

2-14.

INTERNAL BATTERY OPERATION.

2–15. Model 432A Option 001 instruments contain an internal battery and a battery charging assembly. By connecting the 432A to an ac source, the battery may be charged overnight. The battery can be maintained in the charging state indefinitely without damage. It will assume its full capacity, 1.25 ampere-hours, and will not charge in excess of that. This enables the instrument to operate for approximately 20 hours continuously without recharging.

2–16. BATTERY INSTALLATION.

a. Set power switch to off and remove power plug from rear panel.

b. Remove top and bottom, and side instrument covers.

c.

The battery is installed with the terminals toward the right hand side of the instrument when faced from the front. The two terminals on the battery fit into spaces provided on the circuit board.

d. Using the retaining nuts, fasten the battery firmly in place. Be careful not to short the battery terminals at any time as this may cause battery cell damage.

e.

Install assembly A7, battery charging board, in the space provided for it just ahead of the battery.

f.

Reinstall instrument covers and adjust circuit.

Instrument is now ready for operation.

2–17. BATTERY STORAGE.

2–18. Store the battery at or below room temperature.

Extended storage at high temperature will reduce the cell charge, but will not damage the battery if the storage temperature is below 140 °F. Install the battery in the instrument and recharge before using Model 432A in battery operation.

2-19.

RACK MOUNTING.

2–20. Model 432A is narrower than full-rack width. It is what is termed a sub-modular unit. When used alone, the instrument can be bench mounted. When used in combination with other sub-modular units it may be bench or rack mounted. The HP 1051A and 1052A

Combining Cases and Rack Adapter Frames are designed specifically for this purpose.

2–21. COMBINING CASE.

2–22. A model 1051A Combining Case is shown in

Figure 2–1. This case is full rack width and accepts varying combinations of submodular instruments. The case, purchased separately, is provided with a rack mounting kit. The combining case will hold three

2-1

Section II

Installation

CD

ADAPTER

FRAME

\

Model 432A mstruments the same size as the Model 432A. When mstruments are mstalled ill the combining case, they may be installed or removed mdividually.

2-23. ADAPTER FRAMES.

2-24. The 5060-0797 Adapter Frame is shown mFigure 2-2. The frame will accept a variety of submodular units in a manner suitable for rack mountmg.

Submodular units, ill combination with any necessary spacers are assembled within the frame. A submodular unit cannot be removed mdividually.

2-25. REPACKING FOR SHIPMENT.

2-26. When returning an in st r u m e n t to Hewlett-

Packard use the original packing material. If the original foam type packing material is not available, contact an authorized HP Sales Office for assistance.

If this is not possible, first protect the instrument surfaces by wrapping in heavy kraft paper or with sheets of cardboard flat against the mstrument. Protect the instrument on all sides usmg approximately 4" of packing material and pack ill a durable contamer. Mark the contamer clearly for proper handling and insure adequately before shipping.

2-27. When an mstrument is returned to HP for service or repair, attach a tag to the instrument specifying the owner and desired action. All correspondence should identify the instrument by model number and full eight-digit serial number.

SPACER CLAMP

RETAINING SCREWS

Figure 2-1. Sub-module Installation ill

Rack

Adapter Frame

CD

INSERT DIVIDER, ENGAGING

TABS IN TOP AND BOTTOM

MOUNTING SLOTS

®

TWIST DIVIDER TO VERTICAL

POSITION

@

PUSH RETAINER OOWN

TO RELEASE

©

SLIDE INSTRUMENT

INTO CASE

@

PUSH

IN TO

LIMIT

2-2

©

SLIDE LATCH TO LOCK

DIVIDER

0

TO SET RETAINER BACK IN

PLACE, ENGAGE HOOKS FIRST

ON ONE SIDE OF DIVIDER,

THEN ON OTHER

©

PUSH RETAINER UP TO LOCK

Figure 2-2. HP Model 1051A Combining

Case Instrument Installation

Model 432A

Section Ill

Operating Instructions

SECTION Ill

OPERATING INFORMATION

3-1. INTRODUCTION.

3-2. The Model 432APower Meter operates with HP temperature-compensated thermistor mounts such as the 8478B and 478A Coaxial, and 486A Waveguide series. The frequency range of the 432A with these mounts in 50-ohm coaxial systems is 10 MHz to 18

GHz; in waveguide systems it is 2. 6 GHz to 40 GHz.

Full-scale power ranges are 10 microwatts to 10 milliwatts (-20 dBm to +10 dBm). Extended measurements may be made to 1 microwatt (-30 dBm). The total measurement capacity of the instrument is divided into seven ranges, selected by a front - panel

RANGE switch.

3-3. This section describes general operating procedures and error analysis in microwave power measurement. Application Note 64, available on request from Hewlett-Packard, is a detailed analysis of microwave power measurement problems and techniques.

3-4. CONTROLS.CONNECTORS.AND

INDICATORS.

3-4. The front and rear panel controls, connectors, and indicators are explained in Figure 3-2. The descriptions are keyed to the corresponding items which are indicated on the figure.

3-6. The COARSE ZERO and FINE ZERO controls zero the meter. Zero carry-over from the most sensitive range to the other six ranges is within ±0. 5%.

When the RANGE switch is set to COARSE ZERO, the meter indicates thermistor bridge unbalance, and the front panel COARSE ZERO adjust is for initial bridge balance. For best results, FINE ZERO the 432A on the particular meter range in use.

3-7. The CALIBRATION FACTOR switch provides discrete amounts of compensation for measurement uncertainties related to SWR and thermistor mount efficiency. The Calibration Factor value permits direct meter reading of the RF Power delivered to an impedance equal to the characteristic impedance (Z

0 ) of the transmission line between the thermistor mount and the RF source. Calibration Factor values are marked on the label of each 8478B, 478A or 486A

Thermistor Mount. For further details, see Paragraph 3-23.

3-8. The MOUNT RESISTANCE switch on the front panel compensates for three types of thermistor mounts. Model 486A waveguide mounts can be used by setting the MOUNT RESISTANCE. switch to 10051 or 20051, depending on the thermistor mount used

(refer to Table 1-2). The 20051 position is used with

Models 478A and 8478B Thermistor Mounts.

3-9. The rear -panel BNC connected labeled RE-

CORDER provides an output voltage linearly proportional to the meter current; 1 volt into an open circuit equals full-scale meter deflection. This voltage is developed across a lK resistor; therefore, when a recorder with a lK input impedance is connected to the RECORDER output, approximately . 5 volt will equal full scale deflection. This loading of the RE-

CORDER output has no effect on the accuracy of the

432A panel meter.

3-10. A digital voltmeter can be connected to the rear panel RECORDER output for more resolution of power meter readings. When a voltmeter with input impedance greater than 1 megohm is connected to the

RECORDER output, 1 volt equals full scale deflection.

3-11. The 432A has two calibration jacks (VRF and

V

COMP) on the rear panel that can be used for precision power measurements. Instrument error can be reduced from ±1% to ±(0. 2% of reading +5µ.W) of reading, depending on the care taken in measurement and on the accuracy of auxiliary equipment. For further information, see Paragraph 3-27.

3-12. BATTERY OPERATION.

3-13. The Model 432AOption001instrumentscontain tery and conventional 115- or 230-volt line power. A rechargeable Nickel - Cadmium battery is factory installed in Option 01 instruments. The same battery can be ordered and later installed on the basic instrument, thereby modifying the power meter to the Option 01 configuration. The battery installation kit,

HPpart number 00432-6016 (including battery charging circuit) may be ordered from the nearest HP Sales

Office.

3-14. It is recommended that the Model 432A be battery-operated for up to eight hours, and then allowed to recharge eight hours, or overnight. Continuous battery operation is possible for up to about 20 hours, but then the battery must be recharged for about 20 hours.

3-15. The 432A automatically operates on its internal battery whenever the ac line power is disconnected and the POWER switch is ON. When the battery terminal voltage decreases far enough to force the power supply voltage regulator out of regulation, then the meter stops working and the meter indicator points to the red RECHG BAT. To recharge the battery, simply connect the 432A to ac line power, and turn it

ON.

3 -16. Battery Storage. Storage of the battery at or below room temperature is best. Extended storage at temperatures above room temperature will reduce cell charge, but will not damage the battery; however, the battery should not be stored where the temperature exceeds 60°C ( + 140°F).

3-1

Section III

Operating Instructions

3-17. MICROWAVE POWER MEASUREMENT

ACCURACY.

3-18. A number of factors affect the overallaccuracy of power measurement. The major sources of error are mismatch error, RF losses, and instrumentation error.

3-19. Mismatch Error. In a practical measurement situation, both the source and thermistor mount have

SWR, and the source is seldom matched to the thermistor mount unless a tuner is used. The amount of mismatch loss in any measurement depends on the total

SWR present. The impedance that the source sees is determined by the acutal thermistor mount impedance, the electrical length of the line, and the characteristic impedance of the line, Z

0 •

3-20. Ingeneral, neither the source nor the thermistor mount has Zo impedance, and the actual impedances are known only as reflection coefficients, mismatch losses, or SWR. The power delivered to the thermistor mount - and hence the mismatch loss - can only be described as being somewhere between two limits.

The uncertainty of power measurement due to mismatch loss increases with SWR. Limits of mismatch loss are generally determined by means of a chart such as the Mismatch Loss Limits charts in Application Note

64. The total mismatch 1 o s s uncertainty in power measurement is determined by algebraically adding the thermistor mount losses to the uncertainty caused by source and thermistor mount Zo match.

Model 432A a load impedance equal to Z

0 .

More accurately, the relationship between indicated power and the power available to a Z

0 load is given by the following equation:

P indicated ( 1

±

p p ) s m

2

Po

=

-=c,_a.,,.lib=· -r-a-,-t.,..io-n-=F,,_a-c-,-to_r where

P =

0 power available to a Z

0

Ps

load source reflection coefficient thermistor mount reflection coefficient

SWR

-1 p=SWR+l

Calibration factor doe s not compensate for source

VSWR, or for multiple reflections between the source and the thermistor mount.

3-26. To minimize mismatch between the source and the thermistor mount without a tuner, insert a low

SWR precision attenuator in the transmission line between the thermistor mount and the source. Since the mount impedance (and corresponding SWR) deviates significnatly only at the high and low ends of a microwave band, it is generally unnecessary to use a tuner.

A tuner or other effective means of reducing mismatch error is recommended when the source SWR is high or when more accuracy is required. For further details, there is a complete discussion of microwave power measurement with emphasis on modern techniques, accuracy considerations and sources of error available in Application Note 64. 3-21. RF Losses. RF losses account for the power entering the thermistor mount but not dissipated in the detection thermistor element. Such losses may be in the walls of a waveguide mount, the center conductor of a coaxial mount, capacitor dielectric, poor connections within the mount, or due to radiation.

3-22. Instrumentation Error. The degree of inability of the instrument to measure the substitution power supplied tothethermistor mount iscalledpowermeter accuracy or instrumentation error. Instrumentation error of the Model 432A is ±1% of full scale, 0°C to

+55°C.

3-23. CALIBRATION FACTOR AND EFFECTIVE

EFFICIENCY.

3-24. Calibration factor and effective efficiency are correction factors for improving power measurement accuracy. Both factors are marked on every HP thermistor mount. Calibration factor compensates for thermistor mount VSWR and RF losses whenever the thermistor mount is connected to an RF source without a tuner. Effective efficiency compensates for thermistor mount RF losses when a tuner is used in the measurement system.

3-25. When the 432A CALIBRATION FACTOR selector is set to the appropriate factor indicated on the thermistor mount, the power indicated by the meter is the power that would be delivered by the source to

3-2

3-27. PRECISION POWER

MEASUREMENT.

3-28. GENERAL.

3-29. Using precision instruments and careful procedures, measurement error can be reduced to ±0.2% of reading

+0.5 µW.

The technique involves:

1) zeroing the bridge circuits and measuring the bridge amplifier output voltage difference with a digital voltmeter, then 2) connecting RF power to the thermistor mount and then measuring the bridge amplifier output voltage difference again, and

3) calculating the power from the two measurements. Figure 3-1 shows the instrument setup for de substitution measurement.

Use an

HP

Model 3440A DVM, with a 3443A Plug- in

Unit or a digital voltmeter with equivalent accuracy.

3-30. MEASUREMENT PROCEDURE. a. Connect the DVM to the 432A rear panel Vcomp and VRF outputs. Be sure that the digital voltmeter input is isolated from chasses ground. b. Turn off, or disconnect the RF power from the thermistor mount.

Model 432A

R FIN._-

3440A/ 3443A

-

01

I

\

•

I

I

I

VcOMP,

VRF(REAR)

I~

' . ®'

-

THERMISTOR MOUNT

CABLE

Figure 3-1. Precision Power Measurements

Section III

Operating Information c. Zero the 432A with the COARSE ZERO controls. d. Depress the FINE ZERO toggle, and measure the differential voltage (Vo) between Vcomp and VRF·

Vo= VCOMP- VRF e. Release the FINE ZERO toggle, and turn on, or reconnect the RF power to the thermistor mount. f.

Measure again the differential voltage ( V 1) be tween V RF and V COMP·

V1

=

VcoMP - VRF g. Measure V COMP to ground. h. Calculate incident

RF power from the equation

1 -

4R

2 2 l

2 V COMP

(V 1 -

Vo> + VO - V 1

~

PRF

=

EFFECTIVE EFFICIENCY where

R is the thermistor mount resistance.

3-3

Section III

General Information

5

4

2

432A POWER METER

(]!p}j

HEWLETT • PACKARD mW - RANGE - dBIW

.3

.I

-5

Model 432A

6

7

8

9

3-4

Figure 3-2. Front Panel Controls, Connectors and Indicators (Sheet 1 of

2)

Model 432A Section III

Operating Information

1.

2.

3.

4.

5.

POWER. Instrument power ON/OFF switch; connects either ac line voltage or internal battery (Option 01 only) to internal voltage regulator circuits. When ac power is on, optional battery charging circuit operates.

COURSE ZERO. Meter zero adjustment; set the

RANGE selector to COURSE ZERO, turn OFF the RF power, and adjust to zero the meter.

RANGE. Power measurement range selector; selects ranges from 0.01 to 10 milliwatts (-20 to

+10 dBm). COURSE ZERO setting is used to zero meter with no power applied to thermistor mount.

FINE ZERO. Electronic zero that balances the compensation bridge with zero RF input. To zero meter during operation, close the switch momentarily. Be sure that RF power is not applied to the thermistor mount when the FINE

ZERO switch is depressed.

Meter. Indicates power input to thermistor mount in milliwatts and dBm. To use the dBm scale, note the value in dBM of the range in use, and subtract from it the reading on the meter dBm scale.

6.

7.

8.

9.

Mechanical Meter Zero. Sets meter suspension so that meter indicates zero. To adjust the zero: a. Turn POWER switch off.

b. Turn the adjustment screw clockwise until the indicator falls below zero and comes back up to zero again.

c.

Turn the adjustment very slightly counterclockwise to free up the mechanism from the adjusting peg.

CALIBRATION FACTOR. Amplifier gain compensation selector. Set to correspond to the calibration factor printed on the thermistor mount body. See paragraph 3 −23 for more information.

MOUNT RESISTANCE. Selects resistance equal to that of mount in use to balance bridges.

Table 1 −2 lists Hewlett-Packard thermistor mounts and resistances. Set with meter power

OFF, when mount is initially connected to the meter.

Thermistor Mount Cable Connector. Input connector for 5-1/2 foot cable that connects to the 478A, 8478B, or 486A Thermistor Mounts.

NOTE: The photograph opposite is for illustration purposes only.

Figure 3 −2. Front Panel Controls, Connectors and Indicators (Sheet 2 of 2)

3 −5

Section III

Opera t ing Information

3-6

Figure 3 -3 . Rear Panel Controls and Connectors (Sheet 1 of 2)

7

2

Model 432A

Model 432A Section III

Operating Information

3.

4.

1.

2.

Line Fuse. For 115 Vac or for 230 Vac use 1/8 amp fuse

Power Cord Input. Use power cord provided,

HP 8120-0078. Line power limits are 115/230

Vac, 48-440 Hz. Check FUSE rating and position of line voltage slide switch before connecting power.

Line Voltage Slide Switch: Set to line voltage available (115 or 230 Vac, 48-440 Hz).

Mounting Hole for Option 002 Model Power

Meters. Thermistor mount cable connector installed and wired in parallel with front-panel connector. Only one mount at a time may be used with the power meter.

5.

6.

7.

V

RF

Input. Connected directly to RF bridge.

Used for calibrating power meter with

HP 8477A Power Meter Calibrator. Also used for precision power measurements.

V

COMP

Input. Connected directly to compensation bridge. Used for calibrating power meter with HP 8477A Power Meter

Calibrator. Also used for precision power measurements.

RECORDER OUTPUT. Voltage from meter circuit to be used for recorder or digital voltmeter. Output impedance is approx. 1000

Ω

.

NOTE: The photograph opposite is for illustration purposes only.

Figure 3 −3. Rear Panel Controls and Connectors (Sheet 2 of 2)

3 −7

Section III

Operating Information

dBm

6

5

4

432A POWER METER

HEWLETT • PACl<ARO mW - RANGE -

48111

.3

-5

3

10 10 ro

2

7

Model 432A

3-8

Figure 3-4. Turn On and Zeroing Procedure (Sheet 1 of 2)

Model 432A Section III

Operating Information

1.

2.

3.

4.

Connect thermistor mount and cable to

THERMISTOR MOUNT connector. Refer to

Table 1 −2 for recommended thermistor mounts and their frequency ranges.

Meter Mechanical Zero: a. With the instrument turned off, rotate the meter adjustment screw clockwise until the pointer approaches the zero mark from the left.

b. Continue the clockwise rotation until the pointer coincides with the zero mark. If the pointer overshoots, continue rotating the adjustment screw clockwise until the pointer once again approaches the zero mark from the left.

c.

Rotate the adjustment screw about three degrees counterclockwise to disengage screw adjustment from the meter suspension.

Set the MOUNT RES switch to correspond to the operating resistance of thermistor mount used.

Turn the 432A POWER switch ON. For battery operation, the AC LINE indicator does not turn on.

5.

6.

7.

8.

Set RANGE selector to COURSE ZERO and then zero the meter with the COURSE ZERO screwdriver adjustment.

Note

The power meter should be zeroed with the

RF power source turned off, or the mount disconnected from the source.

Set the range selector to the 0.01 mW range; then depress the FINE ZERO switch until the meter indicates zero.

Note

Range-to-range zero carryover is less than

±0.5% if the meter zero has been adjusted

(step 2 above), and the instrument has been properly zero-set on the sensitive range. For maximum accuracy, zero-set the power meter on the range to be used.

Set CALIB FACTOR switch to correspond to

Calibration Factor imprinted on HP thermistor mount label.

Apply RF power to the thermistor mount. Power is indicated on the meter directly in mW or dBm.

NOTE: The photograph opposite is for illustration purposes only.

Figure 3 −4. Turn On and Zeroing Procedure (Sheet 2 of 2)

3 −9

Model 432A

Section IV

Principles of Operation

4-0

RF Hi

>-------

RF

BRIDGE

COMP EN SAT ION

BRIDGE

'

5

KHZ

.IlSL

5

KHZ

MUL Tl VIBRATOR

5KHZ

l.fU

VcoMP + VRF

~

••

VOLTAGE-

VRF

..

CHOPPING

~

&

~ r

SUMMING

CIRCU!TS

J '

VCOMP r-IU1

TO-TIME

CONVERTER

AMPUFIERS

ELECTRON JC

SWITCH

TO CVcoMP -VRF)

_ l

/ 6

RANGE nJLT

VcoMP-VRF

-j

r

PULSE WIDTH PROPORT JONAL

TO <V COMP +V RF l

JUL l

Q

CALIBRATION FACTOR

AUTO-ZERO

,_

C!RCUIT

""

Figure 4-1. Simplified 432A Block Diagram

'

M

Model 432A

Section

IV

Principles of Operation

4-1. SIMPLIFIED DESCRIPTION

4-2. The HP 432A Power Meter consists of two major sections: the bridge and meter logic assemblies.

The instrument also contains an auto zero circuit which provides for automatic zeroing on any range.

A simplified block diagram of the

HP

432A is shown in Figure 4-1.

4-3. The bridge section contains circuits which form two self - balancing bridge circuits when a suitable thermistor mount is connected to the 432A. Each bridge is automatically brought to balance by the action of a high gain de amplifier feeding power to the top of the bridge. The voltage at the top of the RF bridge, VRF is responsive to both input RF power and ambient temperature changes. The voltage at the top of the compensation bridge, V COMP is responsive only to ambient temperature changes. Knowing VRF and VCOMP, the RF power can be calculated.

4-4. The meter logic section processes VRF and

V COMP to produce a meter current proportional to

RF power. The sum (VRF

+

V COMP) controls the width of 5 kHz pulses. The difference (V COMP -

VRF) is chopped, amplified and fed to an electronic switch actuated by the controlled width pulses. Therefore, the meter current is pulses of variable height and width with the meter indicating the average current. (This process produces a meter current proportional to (VRF + VCOMP) (VRF - VCOMP). Paragraph 4-10 explains why this is necessary.

4-5. FUNCTIONAL BLOCK

DIAGRAM

4-6. A functional block diagram of the 432A power meter is shown in Figure 4-2. The instrument comprises two major assemblies: bridge assembly Al and meter logic assembly A2. Auto zero circuit AlAl, which provides for automatic zeroing of the instrument, is included as part of logic assembly Al.

4-7. The thermistor bridges are biased with direct current from the bridge amplifiers. Each bridge amplifier supplies enough heating current to bring the thermistor resistance to 100 or 200 ohms, depending upon the setting of the MOUNT RESISTANCE switch on the 432A. If one of the thermistor bridges is unbalanced due to incorrect thermistor resistance, an error voltage occurs and is amplified by the bridge amplifier. The error voltage is applied to the top of the bridge and changes the power dissipation of the negative temperature coefficient thermistor. The change of power dissipation causes the resistance to the thermistor to change in the direction required to balance the bridge. Application of RF power to the

RF bridge heats ~he thermistor and lowers its resistance. The bridge circuit responds by reducing the de voltage applied to the top of the bridge thus maintaining bridge balance.

SECTION IV

PRINCIPLES OF OPERATION

4-8. If ambient temperature causes changes in the thermistor resistance, the bridge circuits respond by applying an error voltage to the bridges to maintain bridge balance. The voltage at the top of the RF bridge is dependent upon both ambient temperature and the

RF input. The voltage at the top of the compensation bridge is dependent upon the ambient temperature only. The power meter reading is brought to zero with no applied RF power by making VCOMP equal to VRF so (VCOMP - VRF) equals zero. Since ambient temperature causes both thermistors to respond similarly, there will be no net difference between the amplifier output voltages. Therefore, any difference in output volrages from the bridges is now due to RF power absorbed by the thermistor mount.

4-9. The RF bridge voltage, VRF, and the compensation bridge voltage, VcOMP, contain the "RF power" information. To provide a meter reading proportional to RF power the de voltages (VRF,

V COMP) must be further processed by the meter logic circuits.

4-10. The required processing is derived as follows: P

0 is absorbed power needed by the RF thermistor to bring its resistance to R ohms (100 or 200 ohms). P

0 consists of two components: RF power anddc power suppliedbythe432A. The self-balancing action of the bridge circuit automatically adjusts the de power so that the total power in the thermistor is

Po. This de power is relatedto the voltage VRF at the top of the bridge by (VRF/2)2/R. Thus

P

0

RF power

+

DC power

VRF2

::: RF power+~

4-11.

RF power can be determined by measuring

VRF withand without applied RFpower and then doing some arithmetic. But this power measuring scheme is neither convenient nor temperature compensated

(since P

0 changes with temperature). The 432A introduces another thermistor bridge circuit exposed to the same ambient temperature but not RF power.

This circuit includes adjustments (COARSE and FINE

ZERO) so that the de voltage V COMP at the top of its bridge can be set equal to VRF. Assuming matched

RF and compensation thermistOrs, VRFO (with no RF power) and VCOMP remain equal with ambient tem perature fluctuation. They differ only when the RF power to be measured is applied to the

RF thermistor. Thus, we have

V COMP

=

V RF when RF power 0

0 and p

0

0

+

VCOMP2

4R

4-1

Section IV

Principles of Operation

Combining equations, we have:

VCOMP2

4R

VRF2

RF power+~ or

RF power

V COMP2 - V RF2

4R

1

=

4R

(v

COMP + VRF

)(v

COMP - VRF)

4-12. Thus an RF power measurement reduces to setting VCOMP

=

VRFO (with zero RF power) initially, measuring VCOMP and VRF, and computing with the above formula. The 432A carries out the computation by forming the indicated sum and difference, performing the multiplication and displaying the result on a meter.

4-13. The meter logic circuits change the two de voltages to two pulse signals which contain all the RF power information. One of the signals will be a square wave whose amplitude is proportional to VCOMP -

VRF. The other signal will have a pulse width proportional to VcoMP + VRF.

4-14. The VCOMP - VRF signal is obtained bytaking the de voltage outputs from the Al assembly and applying them to a chopper circuit. This chopper circuit is driven by a 5-kHz multivibrator. The output of the chopper is a square wave signal whose amplitude is pr,Pportional to V COMP - VRF. The output of the chopper is coupled to the range amplifier and then to the calibration factor amplifier. The amplification that the signal receives in these two amplifiers depends upon the setting of the RANGE switch and the

CALIBRATION FACTOR switch. The output of the calibration factor amplifier is

V.

This current is fed to the electronic switch. A square wave current with amplitude proportional to (VCOMP - VRF).

Model 432A

4-15. The VCOMP + VRF signal is obtained by taking the two de voltages from Al assembly through a summing circuit and feeding this voltage to a voltageto-time converter. The voltage-to-time converter is driven by a 5-kHz multi vibrator. The output of the voltage - to - time converter is a signal whose pulse width is proportional to the sum of VCOMP + VRF.

This signal controls the electronic switch. From the

VCOMP - VRF and VCOMP + VRF inputs, the electronic switch provides a 5-kHz pulse train whose amplitude is proportional to VCOMP - VRF and whose pulse width is proportional to VCOMP + VRF· The pulse width is always 90 msec or less.

4-16. The bias circuit switch and filter provides a zero current reference for the meter circuits. This is accomplished by controlling the de bias to the first stage of the calibration factor amplifier. This circuit, in effect, restores the de component to the square wave which has been amplified by ac coupled amplifiers.

4-17. The meter is a 0-1 mA, full-scale meter that has a capacitor across its terminals. The capacitor integrates the output pulses from the current switch so the current into the meter is proportional to the time average of the input pulses. That is, the input current to the meter is proportional to the product of

(v

COMP + VRF)

(v

COMP - VRF)

=

(v

COMPJ

2

-

(v

RF)

2

4-18. The output from the meter is further filtered so the voltage at the rear panel RECORDER output is suitable for use with either a digital voltmeter or X-Y recorder. The RECORDER output voltage is returned to the compensation bridge through the automatic zero circuit when the FINE ZERO switch is depressed.

The automatic zero circuit holds a correction voltage at the input of the compensation bridge amplifier, so when the RF is zero, the meter indication will also be zero.

4-2

I

""'

~

\

I

\

\

\

I

\

RF

BRIDGE

IK

COMPENSATION

BRIDGE

IK

••

VRf

I

I

Al IRIDGI ASSYIA2 MHH LOGIC

I

I

I

I

:

>

+j

I

I

I

I

I Vfff

I :

r•- -

_J

VcOllP

I

I

I

I

I

I

I

I

I

SUMMING

C1RClJlT

(vcOMP+ VRF)

I

I

L, __ ,

·-i

1200~

_ru-uc

VcoMP-v•F

- , - - -

\

PULSE AMPl.JTUDE PROPORTIO .. AL

10 Vcohl!P -vRF

I

CHOPPER

I

5KHr

MULTI-

VI BR ATOR

CAl.IBRATiON

FACTOR

SWITCH

Juui..:~

~ ~VcoMp+VRF

LOW-PASS

FILTER

I

VcoMP lcdiill5E ze:fld

If.I

I

I

I

I

VcoMPI

1----------,

I

~UTO

ZERO

I

I

I l/OLTAG£-TO-TIME

CONVERTER

-J i--zooµ.s

I

I

!FINE

UROf

I

I

I

0

'

CIRCUll

I

I

I

.JUUL

-1 l--V.:011p+VRF

PULSE WIDTH

PROPORTIONAL

TO Vf":nMo

'"'"'

+

VRf

t"--:,------------------------------__J

AIAI AUTO %110

I

I

I

I

:fl[cii<£oIF!j

Figure 4-2. Model 432A Block Diagram

~

5·

n

.a·

~

{IJ g,

~ ro gi g_

'1 ....

§'<

~

~

""'

>

-1!v

CD

- l $ Y - - - - - <

+m-7.:)

TO

-lOOM

0

F5§'

Al' Tli[ltfilf$TOff

IPUOOE

~-=~=nT: ll:M 1 '.~~n.~

Al THE:RMISTOR BRIDGE

AS~EMBLY WOf!l--600Z41

~

...

...

CID

CID

(][)

+ rv

..

~

...

lSft lt0r£ 1J

,,..

•7'1

I

,

...

..

..

•l.ZV

~~

~

I

~VH

I

N.IT~-~R()

I ~~":1

-

"""""""'

- - - - P R I N M l : Y SIGNAL

----$£COHC'AltY $!Glt!AL

- - - - r c n : i t • C M SIGNAL t

S£E

&AD~lllll:G, Al'flfflil.»X l

Qll, 15

- - - i

>l:Al

~.zv

8RIDGE CURRENT

SOUfiCE

Hv--3HF..rv

Qll

·m-·

L]CD

..

I

:oo

rer·fl

I

'

+?i.2'Y

0

I

'

'

'

[~

' '

:

:

'

'

'

'

...

"

I I

I I

'"

Y

+uv'

_ __j

:

:

5ll)H.6l v

)•Lt="'""'""'""

'i:! rn

"1

(I>

s·

(") l4. g

::; < a

~

"1 a g

1

~

....

""

~

Figure 4-3. Model 432A RF Bridge Talking Schematic (Sheet 1 of 2)

~

I

<.Jl thermistor resistance. RF power to

MOUift RESISTANCE switch adjusts the bridge

~

. circuit for 100-ohm or 200-ohm thermistors,

The bridge output CVaFl Is ta.ken from S3 a.nd

Is applied to Ql2A/B. As RF Input power Increases, the thermistor resistance decreases and requires

I less feedback current from Qll. Accordingly,

I

•' ro

1S!1J1<'•

I

trv

09.lO

'

I

Differential Amplifier

.nv

'

the

thermistor decreaeee its resislance; QI

1 then supplies less current lo compensate. Ql5 provides current gain to drive QI I.

VaF decrea&es with Increasing RF Input.

117

...

~~

1 ...

'

Dllferentlal Amplifier

.;."

... ,,,

"ti

..J,.

1 ,

I

·<El

! '

;

J,

.!!!...

-HO::tl

.

.

Th lst B erm or r

1

..,.

Consists of the thermistor, R16, R14 and R3 (R3 and

R2 for 200-ohm therml.stors). The MOUNT RESis:-

TANCE switch adjusts the bridge circuit for 100-ohm or 200-ohm therml.stors. The bridge output

{V COMP)

Is taken from S3 and Is applied to

Q'I

A/B. COARSE

ZERO variable resistor RI which is in parallel with

1

Ql2A/B ampllty voltage dit!erences be-

;~ tween the two sides of the bridge. Ql3 Is a high-Impedance current .source lor high amplifier common-mode rejection. Rl5 Is a balance potentiometer to equalize the base voltages ol Ql2 A and

B. C8/C9/R28, and

C7 /R24 are for roll-olf above about

100 Hz. C6 and en filter out RF Interference. The guard rings around the base tr

.. h

,::.;---:=.

Bridge Current Source

Ql4 and

Q6 supply biaa current to the bridge circuit to maintain correct thermistor re-

RH and Rl6 Is a bridge-balance adjustment. As the ambient temperature changes, the thermistor realslance changes, thus, requiring more or less feedback

,~ liU'fO-fUIO

~

..

1

" '

0

Jt••

:

(iiil),

!

<

11

!!!!1 : ·•

I

,.u.o DUferenttai Ampltfler

QI

QI and Q2 amplify any current due to

~~1 1 :',:~:R.': ;~~!; ~ 0 1 ~heRt~!.~!

1 :~· any sucb volta&e is an error signal. The'

~

m

j

•::

• •

"" '"" """,, i"'

!'"'

f@§

~ current from

Q6.

The rellult: VcoMP changes lo

Auto Zero Adi

1·

H

IUf

01•

~lt. t--._..,, .. -----,

,--

R43 adjusts auto zero circuitry so instrument zeros precisely on zero.

'"'

l u:.

Q4 connections of Ql2 A

It Q12B protect the base circuits from leakage current across

: the board.

...

Differential Amplifier and Q5 ampllly the voltage dl!lerence between the collectors of Q7 A and B.

01.e

DIFFERENTIAL

AMPt.1r1EI!

<•

(),Qt

071~.

Olflerentlal Amplifier

Q7

I

sistance. Ambient temperature Increases will decrease the thermistor resi.stance;

Q6 then supplies leas current to compensate.

, ,.

--

1

A & B amplifier voltage dlf[erences between the two sides ol the br!<lg.,. Q8 la a high-Impedance current source for high ampltfter common-mode rejection. R12

I

CD r

;

O : ,.

J

I

,

Thermistor Bridge

Consists of the thermi.stor, R29, R27, and RS

(R4 and RS for 200-ohm thermistors}. The

I

Q3 is normally off: it saturates wh"n RANGE switeh is set to COARSE ZERO.

This sets the 1ate voltage _ _ _ tor of Q2. When Kl opens, Cl holds the charge. of FET AlAlQl at about • -

-6.5 v. V.:hich is halfway l;)et~_een its limits.

A&

uWWWr·e

1

-

Sl'.,QA

8Rl~-~?E~r-~~

FET Memory Circuit

Relay Kl closes for line and coarse zeroing. Cl charges to the error signal voltage at the collec-

FET QI Is a source follower and has high Input

Impedance. The output voltage drives the compensatlon bri<lge so that the meter reads zero when the RF Input Is zero. RI and CR! protect the FET from static charge.

- - - - - - -

-

-

-

.

Bridge Current Source

Ql5 C. QI I supPlY bias current to the bridge circuit to maintain correct

Is a balance potenUometer to equalize the base voltages of Q7 A &t 8. Ct/C5/Rl5,

_ j and C3/RI! are for roll-off above about l-00 Hz. C2 and Clo C!lter out RF Inter-

IR ference. The guard rings around the base connectors of Q7 A

Ii

8 protect the base circuits from leakage current across the

1

'· board.

!

I~·.,

I •• fll:IT lliUIMl:O

A11114,AM

--r'Tt=--

~

1

~

5·

n

'5'

ro-

m g

.&1~

(l)

~

"'I ....

!!?.g g'<

Figure 4-3. Model 432A RF Bridge Talking Schematic (Sheet 2 of 2)

~

0

~

~ c..:i

N

>

I

""'

CT>

f)IO A2 METER LOGIC

AS~~LY !0041l·601&1 t

•?V

-

...

•

032

'-IS&-OCM\:t

,,.

\',!ti'

~('f

I

r..=m:

-~

NOU tltf~.tHCt:i

0

I

:

~

:

I •

·~

Ei8

·-

------ -

I l

+i"C;H:

l""

l ..

~---~

--------

(Of>Yll>!IM'f ltU

•1

MEWt£1T·HCkARO Co

O l "

lolCU:R LOG!C US>' At SDitlii.

"'11!~111'

957·

.,.

IO

030, Q:IZ

CHOPPER

Vftf+Vt';(lMf'-

.............

"

- - - ru:ottM.:K

I m-·DAP"6,;,;.;:H0>,1 lll"' _,..,

034-37

HY RANGE AMPLlflfll

I '

I

I "' I

I

.1,.,

.,,.,... eo

I : 2 w•

'

1!8

)u)!~~--~

·"'"I

I

:@

)}""""'

•111

... rr·

·@

~

ft'

043

CURRENT

I -

SOURCE

..

""'

'

'

'

!d

!i!l

1fjttMr10NJ

I fACTOM

!

.&4$1

[ii)

:

:

!

•0

' l1il

•0

'

.•

....

IO

.....

I

I

'

I

I

'

'

'

'

IE

"'

"'

cm

•o

-

-

..

IO

.,

•O

....

.,

....

-·

.•

...

,,,

11121-21

....

,

...

...

-·

.,

I

C.Zl-26

H-31

:U-Mi

31·50

C'ltll-19

.1:1-n

020-2:4 l6·3? li•H

H•4l

4$-4-1

.,

.....

8&-·86 ftl-4,14

..

.,

"

"

2

-

~~ f:j'~

(") 5·

.a·=

....

~< a

~

(I)

.... a g

~ fi

-

""'

>

Figure 4-4. Model 432A Meter Logic Talking Schematic (Sheet 1 of 2)

ii:.

I

-:i

Switching Amplifier

Amplifier

Electronic Switch

Q27, Q28 and Q29 are fast de coupled swltches.

When the V COMP+ VRF signal is shorted to ground Q44 switches output current Irom calibration

Q24 is driven from saturation to cutoff. The square wave factor ampliHer to the meter circuit for the thru Q26, the base o[ Q27 Is pulled down below its emitter and turns off;

Q28, which was turned off, is duration of the drive pulse from Q29. CRJ 5 output ls 180° out-olturned on and Q29, which was conducting, Js turned is normally back-biased. For Option Ol units phase from the signal off. When the ramp at the base of Q27 forward biases from Q21. CR12 when the battery is discharged~ meter the base-emitter junction of Q27, the opposite sevoltage goes to -6V, so the meter clamps the maximum the power supply. quence occurs. As a result of the gain and timing of RECHG BAT. positive level al +0.6 volts. C23 decouples the 5-kHz signal from

•

these stages, the ramp applied to the base of Q27

30

µA

Current Source

~

LOGIC

ASS~M~l!...!~ emerges as a rectangular wave at the collector of Meter Circuits

Q20 supplies constant current to charge

Q29. The period or this wave is 200 µsec (:>kHz)

·.-CKMG( SIGll!Al..

Integrator capacitor C42 filters the

C25 to generate a ramp. The voltage ol and its symmetry varles with the amplitude ol tV CAlS the +7 volt supply controls the ramp, and current pulses so that meter current

VCOMP +VRF' is proportional to (V COMP

+

V RF)

Is adjusted for meter accuracy.

Wm

i;t;

C~RENT --1ov

I

c

111 w

' I ..__ ..

(VcoMP - VRFl· R72, C43 and C44

'

022,

8 ~~·~~

02~

'

1 '

MULTIVIRRATOR

.

Clock Mullivibrator

.,,

AMPUFIE

Amplifier

- - · -

Q21 Is driven from

S Switch

., - - - . . .

Q26

1s either cut-off or saturated, dependmg on the state of the multivibrator. When Q26 is adjusted so that Voltage-to-time Converter

f

"'.Lc.44

~·~ form a low-pass Hiter. H74 cali-

"' I orates the RECORDER OUTPUT for

316 l volt at full-scale meter deflection.

CR14 bypasses R73 for meter cur-

Q22 and Q23 form an astable 5 kHz multivlbrator. The output is a 7-volt

OIS•H)00$

AMPLIFIER

16!>4d}00!5

R saturation to cutoff. The squ:re wave

, is cut-o!f, C25 charges to VcoMP

+

VRF·

With

Q2~ saturated, Its low impedance shorts by VcoMP +VRFtoapproximately-12.5V. R86

I

~;.:"I rents greater than about 50

µ.A.

t drive other switching circuitry. pos1t1ve level at +0.6

VO s. h

0

"""'b\

V

I square wave (·6V to -13V). Both out-, output is 180 out-orputs are used (180° out-of-phase) to

I phase from the signal from Q24. CRll clamps the maximum

VcOMP + VRF to ground. Both sides of C25 are pulled negative by an amount equal to V COMP

+ VRF• turning off Q27. C25 charges thru cur,,,. rent source, Q20, generating a linear ramp which

Q38 conducts when Q44 is turned off. Any residual current flowing from Q42 (in excess

021 holds off Q27 while it charges from the level set of that current drawn by current source Q43) is shunted thru Q38 and charges C38. This charge adjusts the bias on Q39, Q4l and Q42 and the current from Q42 is reduced. This adjustment operates equally well for tow values ol V COMP of bias level provides good zero carryover.

+ VRF as well as high values.

Feedback Amplifier

I

Chopper

Q30 and Q32 are switches that are operated alternately by the

5 kHz Multivibrator signal. When Q30 conducts (Q32 non-conducting), the signal level at TP6 equals V COMP; the signal level at A2TP6 equals VRF when Q32 conducts. Therefore, the peak-to-peak amplitude al the output signal is equivalent to V COMP V RF'

-·

Calibrate /Operate Selector

032 ltl!SS·~O~l

A2R88 is connect across A2R43 in the CALIBRATE position. This reduces the charge time on A2C29 to provide for optimum frequency response and reduced test time when calibrating the 432A.

I

r

,.,.

: i2m~()I( ~;},I

:

~ft·

Summing Junction

V COMP and VRF are summed at the junction of R78 and R79. In the 200-ohm position, A2R78, A2R79,

A2R50 and Rt4 provide a VcoMP + VRF/2 voltage to the Voltage-to .. time Converter.

Circuit Grounds

C45, CR22 and CR23 isolate the power supply common from the thermistor common conriection. C45 couples the grounds at 5-kHz but blocks de. CR22-CR23 are normally nonconducting but. keep tbe thermistor ground close to power grout1d in case they are not connected thru a thermistor mount and cable.

••1 Q39 and Q40 form a differential amplifier that converts input voltage pulses to output current pulses that drive the meter circuit. Q4 l is a common-emitter amplifier, and Q42 is the output current source. Q43 is a negative current source (about 1.3 mA) so that the meter zero circuits have adjustment range above and below zero.

Range Amplifier

The gain of the range amplifier is variable from 1 to 31.6

1 and ts controlled by varying the Ceedback voltage with the RANGE selector. The input section is a differential amplifier, and its output goes to two cascaded common-emitter amplifiers. Feedback is

[rom the outptt (Q37 collector) to the base of Q35. C46 and C34 and R54 keep the amplifier from oscillating.

ITl

Feedback Loop

Selects the range amplifier in discrete steps from 1 to

!or power ranges from 0.3 mW to 0.01 mW respectively). In all other ranges ampHUer gain equals 1, and the switch attenuates the output, Maximum attenuaUon is 31.6 in the 10 mW range.

!ID

!ID

[!ii]

MRIQ

"

-

•0

..,

...

...

,

..

,.

.....

....

....

,

-

!(}

"

....

Calibration Factor Selector

A4Sl controls resistive feedback to amplifier to vary current gain in discrete is Increased bration factor.

Current output

!or 88% cali-

Cl!-26

29-31

H-315

$t-"1

4f-M;

CRH~1t

21-23

020·2•

16-30

31-U

34-44

ff:U·H

32-36

31-43

I

Al~

4, 14

RI

~13

"

CHASSI$

..

•1

"

2

~

=:r

0 it;· li)

00 a

~g1 tll

'1 .....

.... g.

§<!

Figure 4-4.

Model 432A Meter Logic Talking Schematic (Sheet 2 of 2)

C..:>

N

>

ii:.

~ c.

<ti

-

&0-400MI

Lit« lflf'V'

...

..

·-

...

<II>

·,.

~ a:>

.it ..

=~+·

I

9 •'

'

'

0

""' PIO A2 W:TER ll>GIC

~

'

!

:

'

~

!

' i

~

AS~Y

I

, J..

~-~,

~tf

I•

y

I

_

!

' f<! l

'I

!

.....

-i:ir--"'ii...-'

PIO Al fl£RMISTOR

BRIDGE ASSEMBLY

Qll

OVER-Cl.REIT

PROTB:TION SWITCH

--

-_----,

QI t•!M-oD)fl:

SERIE$

AEQLJ.-

'

I fl.,

M•

..

NOTE:

YOl T&9U '$MO\ll'tll ll't

LNE CJIP'£tiTlON

IATTEA'I IOIG

CM~ trf ,ACTOllT tf:Lf.t'f(O VALUE

~,....,.HEW\.tn-"-CJl'*"co·

•ATMlll'a tlil,UtT a MfTlll! Lo.tt AllilliT

_J t

Kl UClldtAllfll4. APKNOlll t

_ _

~

- llttl1'

:06 ... , • fhS

.Ok

- -

~

-

m

e:

'

!

'

!

!

: llf9 :

Zf5.:

"'~-·"""

lltt'.f'Ot(NCf. Of:S.~'flQNS .,,

CHASS"; et-Q,<:e

Cll!·~.Clf4-t

..

...

....

At: co

.... lllOT ASS"1CO

AlC4.AZR14

3 ldtl.l

'"I

(I)

!:i' g.

-

(')

-=·

g

~< a

~

... a g

.....

I

.i:o. w

~

Figure 4- 5. Model 432A Power Supply Talking Schematic (Sheet 1 of 2)

is:

0

~

N

>

\:,.:)

-

~

~

I i:.o

1!1Al1'flh'ji,£O!AR{;f

S!GH4l

Switch

O'!>!~XW

50·'4001-41

UN( INPUT

:

Q3 is normally ofC. IC

the

battery (Option

01 units only) is discharged, or the power

>ply drops out of regulation, Q5 turns more until Q3 saturates. This turns olf the calibration factor amplifier and ' negative current to the meter, which cates RECHG BAT.

@_ f

•0

..

,

PIO

~

Q

,

© '

~ o

!

0

"""' •• • su•

Over current Protection Switch

Qll turns on if ceeds about 90 mA thru R2 l~~f~h tends to tu ' the curre rn Q2 of! and to limit nt.

1!nPlifler

QI amplifies the error signal from Q4 to control the base current of Q2. CR8 is normally foi·ward biased. For battery operation, CRS is rheverse biased, to prevent t e battery from charging Cl each time the power is turned on (Option 01 only).

I

I

I

Overcurrent Protection Switch (Option 01

Only)

(0002·60l5lt

Comparison Amplifier Comparison

Ampll_~!•.!

Q6 holds the emitter of Q5 slightly Q7 compares the power suppositive with respect to ground ply ground to the voltage on and compensates for temperature changes. Q5 monitors the voltage the divider R12. and Rl3. This way -13 volts Is referenced to divider which consists ol RS, R6, and R7, and compares that to

+7V supply. I! the • l 3V supply shirts, Q'I conducts more or less. l ground. Any dl(ference ls ampllCR7 compensates !or temperafled and fed to Q4. R6 is the power supply adjustment potentiometer; it controls the power ture variations in the baserl of Q'I. w meter calibration.

-----

Ampli!ier

.

Q4 amplifies er_ror

·~

Q5 and drives

__

.---, rJ.

Error Ampliller

- - - - - -

Q8 amplllles any voltage change at the collector of Q'I.

1

"'

00

·~ =;~

~.~HVO( j

OJRAEHl

---------

eg or

Q9 and QIO form a shunt regulator that can pass current from either the +7V supply or the • 13V supply to ground to bold the -13V supply constant.

- - - - ,

0 :

1

I :

,;tQ_

,~~~"'

Voltage Reference

Serles Voltage Regulator CR7 provides a ref·

Q3 is normally orr.

If the current thru

R3 exceeds 60 mA (0:6V), Q3 turns on, which tends to turn Q2 on, This tends to turn QI off & limit the charging current.

OPTl

Sri;

Comparison Amplifier

!Option 0 l Only)

Q4 compares the voltage at the center arm of RS to the voltage at the anode o! CR2.

Any change is amplified as an error voltage. Q4 also compensates for battery voltage variation with temperature.

Ql regulates the battery charging Q2 ••driven by QI to current. Q2 amplilies error sig· hold the +7 volt supply

nail; from the collector of

Q4 and constant. varies base drive to QI to compensate. CR! bypasses QI for battery operation of"the power meter.

"'"'

t&51·00to

AMPLIFIER erence voltage for

+7V. R8 supplies bias current to CR7.

NOTE·

'JOI t.llGUi $tt(IWN tft Ut<E: OPERATION

8Alf(R'i8fi)t<GCttA~ it FAC:TOJtY Sh.ECTEQ VALUE t

S££ &AtlH)Alll<iG, Af>f'E.t«»X l

"

Ci·C5.C4!

CRt-4,GRfHll

~~H

~-=

NOT 11.SSIG"IEO llZCll,AZft14

~;·

2

"'

3

\~~:ffl'f.~~.-:,~~~~-

s·

(")

.a·

ii)

(/) a

~~

ti)

14.

'"1 ....

~g

§'<

Figure 4-5. Model 432A Power Supply Talking Schematic {Sheet 2 of 2)

Section V

Maintenance

Model 432A

Instrument Type

Power Meter Calibrator

DC Digital Voltmeter

Storage Oscilloscope

Vertical Plug- in

Cable Assembly

(2 required)

Test Lead

Cable Assembly

Thermistor Mount

Filter Network

Oscilloscope Probes (2)

Differential Voltmeter

Resistor (2)

Table 5-1. Recommended Test Equipment

Critical Specifications

Range: 0.1to10 mW

Accuracy: .1 to 10 mW ranges: 0.2%

.01 and .03 mW ranges: 0.5%

Range: 0.5 to 50 volts de

Accuracy: ±0.05%

Input Impedance: 10 megohms, floating

Resolution: 4 digits

Variable Persistence Display

Bandwidth: de to 5 MHz

Input Impedance: 1 megohm

Sensitivity: 5 mV /division

Bandwidth: 400 kHz

Input Impedance: 1 megohm

Sensitivity: 1 mV /division

RG 58C/U coaxial cable with 2 each BNC male connectors

Insulated cable terminated with dual banana plug and test clips

Shielded cable with one each BNC and dual banana plug connectors

Operating Resistance: 100 ohm or 200 ohms

Recommended Model

HP 8477A

HP 3440A with 3443A

Plug-in Unit

HP 141A with 1405A and 1420A Plug-in Units

HP 1401A

HP 10503A

HP llOOlA

HP llOOOA

HP 478, 8478

See Figure 5-

2

HP 10001A Division Ratio: 10:1 ±2%

Bandwidth: de to 30 MHz

Rise Time: 5 nsec

Accuracy: ±0.005% of reading

+0.0004% of range± 1 µV lOK 1%, 1/8 watt

HP 740B

0757-0442

5-0

Model 432A Section V

Maintenance

SECTION V

MAINTENANCE

5-1. INTRODUCTION.

5-2. This section provides information for performance testing, adjusting, troubleshooting and repairing the 432A Power Meter. Performance tests allow the instrument to be checked for conformance to specifications.

If performance is not within specifications, adjust or troubleshoot the instrument.

5-3. CONTENT.

5-4. PERFORMANCE TESTS.

5-5. The procedures test power meter performance for incoming inspection, periodic evaluation, calibration and troubleshooting. Specifications in Table 1-1 are the performance standards.

If the power meter fails to meet any of the performance test specifications, refer to the troubleshooting diagrams.

5-6. ADJUSTMENTS.

5-7. Procedures describe the adjustments necessary to calibrate the power meter. Adjust the power meter only when it is determined that the meter is out of adjustment and not malfunctioning due to a circuit failure.

5-8. To avoid errors due to possible ground loop currents, isolate the power meter from ground used for other auxiliary equipment. A power plug adapter that removes the ground connection at the line outlet can be used to isolate the power meter.

5-9. Several circuit components are factory-selected to meet specific circuit requirements. The factory selected parts are indicated on the schematic diagrams.

5-10. TEST EQUIPMENT.

5-11. Instruments and accessories required for adjusting and testing the power meter are listed and briefly described in Table 5-1. Instruments used to maintain the instrument must meet or exceed the specifications given.

5-12. SERVICE INFORMATION.

5-13. Service information in the form of troubleshooting, waveforms, schematics and component locations are given in Section VII. Also, an overall system block diagram is included which contains keyed numbers corresponding to the test points.

5-14. 432A PERFORMANCE TESTS

WITH 8477A CALIBRATOR

5-15. INITIAL SET-UP. a. Connect the 84 77A outputs to the 432A inputs as shown in Figure 5-1. Use appropriate test equipment as listed in Table

5-1.

8477A

3440A/3443A

1

1

o

I I

""--~

\.

THERMISTOR MOUNT CABLE

RECORDER

OUTPUT

!REAR)

Figure 5-1. Check and Adjustment Test Set-Up b.

If necessary, mechanically zero the meter movement as follows:

(1) With instrument turned off, rotate meter adjustment screw clockwise until pointer approaches zero mark from the left.

(2) Continue rotating clockwise until pointer coincides with zero mark.

If pointer overshoots, continue rotating adjustment screw clockwise until pointer once again approaches zero mark from the left.

(3) Rdate adjustment screw about three degrees counterclockwise to disengage screw adjustment from meter suspension.

5-16. METER ACCURACY TEST. a. Set the 8477A Calibrator controls as follows:

POWER (MW)

FUNCTION ..

ZERO/TEST.

. 0.01 mW

20051

. .. ZERO b.

Set

the 432A controls as follows:

A.2Sl (on Meter Logic Assy) . . . . . . CA LIBRA TE

MOUNT RESISTANCE. . . . . . . . . . . . . 2oon

RANGE . . . . . . . . . . . . . . . . . . . . . . . . 0. 1 mW

POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . ON

CALIBRATION FACTOR . . . . . . . . . . . . . . . 100% c. Adjust 8477A ZERO knob for 0 volts ±2 mV in-

dication on the DVM.

5-1

Section V

Maintenance

Table 5-2. Meter Accuracy Test

432A 8477A Digital Voltmeter

Range Range Indication (milli-

Indication (Full

(mW) (mW) volts ±10 mV) scale ±1/2 Div.)

.01 . 01 1000 1

1

3

10

.03

. 1

. 3

1

3

10

. 03

.1

. 3

948.8

1000

948.8

1000

948.8

1000

3

1

3

1

3

1

Model 432A

Table 5-3. Calibration Factor Test

Calibration Factor

Selector Setting (%)

Digital Voltmeter

Indication (m V)

1000 ±2

88

89

90

91

92

989 ±10

978 ±10

967 ±10

957 ±10

93

94

95

96

97

98

99

100

946 ±10

935

±10

926 ±10

916 ±10

907 ±10

897 ±10

889 ±10

880 ±10 d. Set the 8477A controls as follows:

POWER (MW) . . . . . . . . . . . . . . . . . . .

ZERO/TEST . . . . . . . . . . . . . . . . . . .

0.01 mW

TEST e. The digital voltmeter should indicate 1000 ±10 millivolts. f.

The 432A meter should indicate full scale ±1/2 division. g. Repeat steps d through f for each of the other ranges. Set the power meter range selector to the position indicated in

Column 1 of Table 5-2 and set the 8477A meter reading selector to the corresponding position indicated in Column 2 of Table 5-2. In each case, the meter indications should correspond to those shown in Table 5-2, Columns 3 and 4.

5-17. CALIBRATION FACTOR TEST. a. Set 432A controls as follows:

A2Sl (on Meter Logic Assy) • • . . . . CALIBRATE

RANGE . . . . . . . . . . . . . . . . . . . . . . . . 0. 1 mW

CAL FACTOR.. . . . . . . . . . . . . . . . . . . 88%

MOUNT RESISTANCE . . . . . . . . . . . . . . . 2000 b. Set 8477A controls as follows:

FUNCTION . . . . . . . . . . . . . . . . . . 2000

ZERO/TEST Switch . . . . . . . . . . . . . . . TEST

POWER (mW) . . . . . . . . . . . . . . . . . . . . 0. 1 mW c. Set 84 77A ZERO control so that the digital voltmeter reads 1000 ±2 mV. d. Set the calibration factor selector to 89%. e. The digital voltmeter should indicate 989 ±10 millivolts. f. Repeat steps d and e for each position of the

CALIBRATION FACTOR selector. In each case, the digital voltmeter should indicate the voltage shown in the second column of Table 5-3 for the CALIBRATION

FACTOR shown in the first column.

5-2

5-18. METER LINEARITY CHECK. a. Set the 8477A POWER (MW) selector to 1 mW and FUNCTION to200r2, ZERO/TESTswitch to TEST. b. Set the 432ARANGE selector to 3 mW, MOUNT

RESISTANCE to 200Q. c. The 432A meter should indicate 1 mW ±1/2 division. d. Set the 8477A POWER (MW) selector to 2 mW. e. The 432A meter should indicate 2 mW ±1/2 division. f.

Set the 8477A POWER (MW) selector to 3 mW. g.

The 432A meter should indicate 3 mW ±1/2 division. h. Set A2S 1 to OPERA TE.

5-19. ZERO CARRYOVER TEST. a. Disconnect the 432A from the 8477A. b.

Turn the 432A power OFF and connect the thermistor mount cable to a thermistor mount. c. Set the 432A Power Meter MOUNT RESISTANCE selector to the resistance shown on the thermistor mount. d.

Turn

ON the 432A power.

Model 432A

HP 432A

POWER METER

RECORDER

OUTPUT

IOK

THERMISTOR

MOUNT o-f-----1

OSCILLOSCOPE

HP-140A/1401A/1422A

Figure 5-2. Zero Carryover Test Setup e. Connect 141A through filtering network to rear of 432A as shown in Figure 5-2. Set 141A controls as follows:

INPUT . . . . . . . . .

SENSITIVITY . . . .

SWEEP TIME . . . .

TRIGGER LEVEL .

. . . . . . . . . . . . . . . . DC

. . . . . . . . . . . . 1 mV/cm

. . . . . . . . . . . . 2 sec/cm max clockwise (free run) f. Zero the 432A as follows:

(1) Set the RANGE selector maximum cw to

COARSE ZERO.

(2) Set the COARSE ZERO screwdriver adjust so that the meter indicates z'ero.

(3) Set 432A RANGE switch to . 01 mW. Depress the FINE ZERO switch. The meter indication should go to zero without overshoot. g. Rotate the RANGE switch clockwise, one step at a time, while the oscilloscope is sweeping. On each

432A range, the scope trace should be within . 01 mW division (±5 mW) from where it was on the . 01 mW range.

5-20. FINE ZERO RANGE CHECK. a. Set the 432A RANGE selector to 0. 3 mW. Leave the thermistor mount connected to the cable and the

MOUNT RESISTANCE selector set to correspond to the resistance of the mount used. b. Depress the FINE ZERO switch. c. Slowly turn the COARSE ZERO screwdriver adjustment counterclockwise until the meter will no longer zero. The FINE zero circuit is at one end of its range. d. Release FINE ZERO. e. Set the COARSE ZERO screwdriver adjustment so that the meter indicates full scale on the 0-3 scale

(O. 3 mW range).

Section V

Maintenance f. Depress FINE ZERO switch (the fine zero circuit is at the other end of its range). Meter should indicate below 2 on the 0-3 scale. Record the indication. g. Release FINE ZERO. h. Rotate RANGE switch to COARSE ZERO position. The fine zero circuit is now in the center of its range. The meter reading should be 1. 5 + 1/2 reading of step f, ±0. 1 div. on the 0-3 scale .

5-21. 432A CALIBRATION WITHOUT 8477A CALI-

BRATOR.

5-22. The 432A Power Meter can be calibrated without an 84 77A Calibrator using a method similar to the precision power method outlined in Paragraph 3-27.

5-23. A major difference between the two measurements is that external power need not be applied when calibrating the instrument. Normally, in a stable environment, the VCQMP output voltage remains constant, not being affected by external RF power; only the VRF output varies during power measurement.

Since the power that the meter indicates is propor tional to V COMP and VRF, we can cause the meter to indicate a power also by holding VRF constant and varying V COMP. This is easily done on the 432A py turning the COARSE ZERO control. Two calibration procedures are given below. · Full scale readings are not possible on the 10 mW RANGE. Full scale readings are possible on the 3 mW RANGE depending on the mount characteristics.

5-24. CALIBRATION PROCEDURE

1. a. Connect thermistor mount to power meter; let instrument warm up for at least ten minutes. b. Select range which instrument is to be calibrated on.

Note

Ranges below 0. 3 mW require a precise differential voltmeter capable of resolving 1 µ V. The HP 740B DC Standard/ A

Voltmeter, which has an accuracy of

±(0. 005% of reading

+ 0.

0004o/r of range

:::1

µ

V) is recommended. A digital voltmeter is adequate for the 1. 0 mW and higher ranges. c. Connect Differential Voltmeter (or DVM differentially) between the VCOMP and VRF output jacks on the rear panel. See Figure 3-3 for location of VRF and

V

COMP outputs. d. While pressing the FINE ZERO switch, measure and record

Vo.

(Vo is the difference of the bridge voltages with no power applied. ) e. Turn COARSE ZERO control (on front panel) clockwise to a convenient power, e.g. , 9 on the 0 to

10 scale or 2 on the 0 to 3 scale. f. Differentially measure and record V1. V1 is the difference voltage between VCOMP and VRF with power applied.

5-3

Section

V

Maintenance

NOTES

Model 432A

5-4

Model 432A Section

V

Maintenance

INSTRUMENT SERIAL NO.

- - - - - -

DATE

TABLE 5-4. PERFORMANCE TEST CARD

Data in this test card corresponds to Performance Tests in

Paragraphs 5-16 through 5-20.

5-5

e f e f e f e f e f

Section V

Maintenance

Para.

Ref.

Test

TABLE 5-4. PERFORMANCE TEST CARD

Measurement

Unit

5-16 METER ACCURACY e 0.01 mW applied; measure RECORDER OUT voltage mVdc f divisions e f

Meter indicates full-scale (0-1 scale)

Re,eeat on remainin~ 432A ,EOWer ran~es:

Power applied: 0. 03 mW

Meter indication (0-3 scale) mVdc divisions

Min.

990

-1/2

938.8

-1/2

Actual

Model 432A

Max.

1010

+1/2

958.8

+1/2

Power applied: 0. 1 mW

Meter indication (0-1 scale)

Power applied: O. 3 mW

Meter indication (0-3 scale)

Power applied: 1 mW

Meter indication (0-1 scale)

Power applied: 3 mW

Meter indication (0-3 scale)

Power applied: 10 mW

Meter indication (0-1 scale) mVdc divisions mVdc divisions mVdc divisions mVdc divisions mVdc divisions

990

-1/2

938.8

-1/2

990

-1/2

938.8

-1/2

990

-1/2

1010

+1/2

958.8

+1/2

1010

+1/2

958.8

+1/2

1010

+1/2

5-17

CALIBRATION FACTOR i Calibration Factor

(%)

88

89

90

91

92

93

94

95

96

97

98

99

100

5-6

DVM Readin~ (mVdc)

1000

989

978

967

957

946

935

926

916

907

897

889

880 mVdc mVdc mVdc mVdc mVdc mVdc mVdc mVdc mVdc mVdc mVdc mVdc mVdc

936

925

916

906

897

887

879

870

990

979

968

957

947

1010

999

988

977

967

956

945

936

926

917

907

899

890

Model 432A

Section V

Maintenance

Para.

Ref. Test

5-18 c e g

METER LINEARITY

TABLE 5-4. PERFORMANCE TEST CARD

Measurement

Unit

1 mW applied, 3 mW scale: meter indicates 1 mW divisions

2 mW applied, 3 mW scale: meter indicates 2 mW

3 mW applied, 3 mW scale: meter indicates 3 mW divisions divisions

Min.

-1/2

-1/2

-1/2

Actual

Max.

- - -

- - -

+1/2

+1/2

+1/2

5-19

ZERO CARRY -OVER d Zero carry-over:

Range (mW)

.01

.03

.1

. 3

1

3

10

ScoQe Indication

0 ±5 mVdc

O ±5 mVdc

0 ±5 mVdc

0 ±5 mVdc

0 ±5 mVdc

0 ±5 mVdc

0 ±5 mVdc mVdc mVdc mVdc mVdc mVdc mVdc mVdc

-5

-5

-5

-5

-5

-5

-5

- - -

- - -

- - -

- - -

- - -

- - -

+5

+5

+5

+5

+5

+5

+5

5-20 f g

FINE ZERO RANGE

Meter indication on 0-3 scale: divisions

Meter indication on 0-3 scale:

1.

5 '+ 1/2 reading divisions of step f, ±0. 1 div.

1. 75

0.1

- - -

- - -

2.0

0.1

5-7

Section V

Maintenance

NOTES

Model 432A

5-8

Model 432A g. Measure and record VCOMP· Note that the

VCQMP jack is isolated from chassis ground; measure from the center conductor of the BNC to the outer conductor. h. Calculate the power using the following formula*: p

=

4k[

2

VCOMP(v1 vo) v1

2

J

(l) where R is the resistance of the thermistor mount and should be identical to the setting of the MOUNT

RESISTANCE switch. i. If calculated power is different from the value that was set with the COARSE ZERO control, adjust

A2R6 so that the meter reads calculated power.

If the range of A2R6 is insufficient to set new power, it will be necessary to change the value of A2R70.

0 j. to 1

Set COARSE ZERO so that meter reads

1 on the scale. Set A2R72 for 1.

OOOV

±10

mV

RECORDER output jack on the rear panel. at the

5-25. There is a simpler form of the equation that was used to calculate power in step h above. This form ignores VO, the small voltage difference between the two bridges with no power applied. However, VO becomes negligible on the higher ranges, that is, 1 mVandabove, and can be ignored with little decrease in accuracy. The simpler form is as follows:

(2)

5-26. CALIBRATION PROCEDURE 2. a. Connect thermistor mount to power meter; let instrument warm up for at least ten minutes. b. Select

1, 3 or

10 mW range. c. Turn the COARSE ZERO control clockwise to indicate some convenient on-scale reading. d. Measure VcoMP and record. Notethat VcoMP jack is isolated from chassis ground; measure from the center conductor of the BNC to the outer conductor.

e.

Measure VRF and record. Follow measurement procedure in step d. f.

Measure and record VcoMP - VRF· This term must be measured differentially, that is, one side of the DVM connected to

V

COMP and the other side connected to VRF· In this way the full resolution of the

DVM can be used. g. Substituting the measured values into the above formula, calculate the power.

*This formula is accurate for on - scale readings; however, with n0 power applied (i.e. ,

Vl =

Vo) it does not solve to P

=

0 because of a deleted term

+ VO. This term can be neglected for any on-scale

reading.

Section V

Maintenance h.

If calculated power is different from the power set with the COARSE ZERO control, adjust A2R6 so that meter indicates that power, If the range of A2R6 is not great enough to set new power level, the value of A2R70 will have to be changed. i. Adjust COARSE ZERO so that meter reads 1 on the 0 to 1 scale. Set A2R72 for

1.

OOOV ±10 mV at the RECORDER output jack on the rear panel.

5-27. COVER REMOVAL AND

REPLACEMENT.

5-28. The side covers can be removed and replaced independently of the top and bottom covers. Each side cover is held in place by four screws retained by nuts which are fastened to the side frames.

5-29. TOP COVER REMOVAL. a. At the rear of the instrument, remove the screw that retains the cover. b.

Grasp the cover from the rear, and slide it back

1/2 inch. Then tilt forward edge of the cover upward and lift the cover from the instrument.

5-30. TOP COVER REPLACEMENT. a. Rest the cover flat on the cast guides projecting inward near the top of each side frame. b.

Slide the cover forward, allowing its forward edge to enter the groove in the front panel. c. Replace the cover retaining screw.

5-31. BOTTOM COVER REMOVAL. a. Remove the retaining screw at the rear of the cover. b. Swing the tilt stand out to free the cover. c. Slide the cover rearward far enough to free the forward edge. d.

Tilt the forward edge of the cover upward and lift the cover from the instrument.

5-32. BOTTOM COVER REPLACEMENT. a. Set the tilt stand out of the way of the cover. b. Rest the bottom cover flat on the case guides projecting inward near the bottom of each side frame. c. Slide the cover forward on the guides so that the formed portion at the rear of the cover slides over the two short projections at the rear corner of each side frame.

d. Replace the retaining screw,

5-9

Section V

Maintenance

5-33. ADJUSTMENT PROCEDURES.

5-34. INITIAL SETUP. a. Remove the power meter side panels. b. Connect the equipment as shown in Figure 5-1.

Refer to Table

5-1 for equipment specifications.

5-35. MECHANICAL METER ADJUSTMENT. a. When the meter is properly zero - set, the pointer rests over the zero mark on the meter scale when the instrument is:

(1) at normal operating temperature

(2) in its normal operating position

(3) turned off. b.

Set the pointer as follows to obtain best accuracy and mechanical stability:

(1)

Turn instrument off.

(2) Rotate the meter mechanical adjustment screw clockwise until the meter is to the left of zero and moving up the scale toward zero. Stop when the pointer is exactly over the zero mark. If the pointer overshoots, repeat step 2.

(3) When the pointer is exactly on zero, rotate the adjustment screw approximately three degrees counterclockwise. This frees the adjustment screw from the meter suspension. If thepointer moves during this step, repeat steps 2 and 3.

8477A

• ©

•Ii

0

TO AITP5

5440A/5443A

TO AITP6

THERMISTOR MOUNT CABLE

Figure 5-3. Bridge Amplifier Test

Model 432A

5-36. BRIDGE AMPLIFIER TESTS. a. Connect equipment as shown in Figure 5-3. b. Compensation Bridge.

(1) Connect 3440A/3443A between Al TP5 and

Al TP6 (using lOK isolation resistors).

(2) Make the following settings:

432A

RANGE . . . . . . . . . . . . . . . . . . 10 mW

MOUNT RESISTANCE . . . . . . . . . 2000

8477A

FUNCTION . . . . . . SET

(3) Adjust A1Rl2 (OFFSET ADJUST) for 0. 0

±0.1 mVdc reading on the digital voltmeter.

(4) Change 8477A FUNCTION to CHECK. The digital VM reading should not exceed ±0. 4 mVdc. c. RF BRIDGE

(1)

Connect DVM between AlTP3 and AlTP4 using lOK isolation resistors in series with the leads.

(2) Set8477AFUNCTION to SET. AdjustAlR15

(OFFSET ADJUST) for DVM reading of 0. 0

±0.1 mVdc.

(3) Change 8477A FUNCTION to CHECK. The reading should not exceed ±0. 4 mVdc.

Note

Failure of the instrument to meet the specification of steps b (4) and c (3) above indicates insufficient bridge gain. Refer to

Tables 7-3 or 7-4 in the troubleshooting section.

5-37. METER AND RECORDER OUTPUT CALIB-

RATION. a.

Connect the DVM to the 432A RECORDER output. b. Set 8477A controls as follows:

FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . 2000

ZERO/TEST . . . . . . . . . . . . . . . . . . . . . . ZERO

POWER . . . . . . . . . . . . • . . . . . . . . . . . . 1 mW c. Set 432A controls as follows:

A2Sl (on Meter Logic Assy) : . . . . . CALIBRATE

MOUNT RES . . . . . . . . . . . . . . . . . . . . . . . 2oon

RANGE . . . . . . . . . . . . . . . . . . . . . . . . . 1 mW

CAL FACTOR . . . . . . . . . . . . . . . . . . . . . 100%

5-10

Model 432A d. Adjust Zero control on 8477A for DVM indication of 0. 000 ±. 001 V. e. ZERO/TEST on 8477A to TEST. f. Adjust A2R6 in 432A for 432A meter reading of

1.0 mW ±.01 mW.

Section V

Maintenance c.

Switch RANGE to -20 dBm, push FINE ZERO down and adjust A 1R43 for a zero indication on the front panel meter. d. Release FINE ZERO and replace the right side panel.

5-38. BATTERY CHARGER ADJUSTMENT (OPTION

01 ONLY). a. Remove the power meter top panel. g. Adjust A2R74 in 432A for DVM reading of 1. OV

±.

001V. h. Change the following settings :

432A RANGE to 10 mW

8477A POWER (mW) to 10 mW and

ZERO.

Note

ZERO/TEST to

When switching 432A to 10 mW or switching from 10 mW to any other range, the meter will react slowly for

a

short period.

This is due to time constants in the instrument and is normal. b. Connect 432A to ac line power and turn ON. c. Set A 7R8 fully counterclockwise for maximum battery charge rate. d. With the digital voltmeter, measure the voltage between A7TP1 and A7TP2.

e.

Adjust A 7R8 for digital voltmeter reading of 0.

2 to 0. 4 volt (20 to 40 mA through R3) when battery is fully charged. i. Check zero and adjust as necessary. f. Disconnect the test equipment and power, and replace the power meter top and side panels. j.

Set ZERO/TEST to TEST and adjust A2R86 for

DVM reading of 1. 00

±.

001 V. k. Return432A RANGE and 8477A POWER switches to 1 mW and zero as before.

5-39. BATTERY REMOVAL. a. Remove the top cover. b. Remove the two Phillips screws on the top rear of the battery cover.

1.

Adjust A2R6 for DVM reading of 1. 000 ±. 001

V.

c. Lift off the battery cover. m. Perform the adjustments of steps h through 1 again until 432A reads 1 ±. OlOV (at recorder output) on both 1 mW and 10 mW ranges. n. Set A2Sl to OPERATE. o. Turn to the beginning of this section; verify that the instrument meets its specifications by completing the PERFORMANCE TESTS.

5-37A.AUTO ZERO ADJUSTMENT, AlR43t a. Remove the right side panel. b. Connect a mount to the 432A and adjust

COARSE ZERO. d. Loosen the nuts on the battery binding posts. e. Lift out the battery.

5-40. ISOLATING TROUBLE IN TRANSISTOR

CIRCUITS.

5-41. General. The following information should help determine if a transistor works. There are tests for both in - circuit and out - of - circuit transistors, which help to determine if a particular trouble is due to a faulty transistor of some other component. See

Figure 5-2.

Table 5-5. Out-of-Circuit Transistor Resistance Measurements

Connect Ohmmeter

Positive Lead to

Negative Lead to Measure Resistance (ohms)

Small Signal emitter emitter base* collector

200 500 lOK - lOOK

PNP Germanium

Power emitter emitter base* collector

30 50 several hundred

NPN Silicon

Small Signal base collector base emitter emitter emitter lK - 3K very high (might read open}

200 -

1000

Power collector emitter high, often greater than lM

*To test for transistor action, add collector-base short. Measured resistance should decrease.

t

See Back-Dating, Appendix I.

5-11

Section V

Maintenance

DEVICE

NPN TRANSISTOR

PNP TRANSISTOR

SYMBOL

COLLECTOR

~SE~

EMITTER

COLLECTOR

BASE~

EMITTER

Model 432A

CUT OFF CONDUCTING

+20V

ov~

+.3V

/RRENT

(OR-) -::-

+20V

~MA~

CON

CURRENT """

(OR+)

-20V

"""

__ 3 V

-20V

/URRENT

CON

CURRENT -::-

5-12

FIELD EFFECT TRANSISTORS

METAL CASE BLACK EPOXY

METAL CASE

(PLASTIC) g

-1

~ ~ ~

D 6 S

OR

G D S

w

OR

Ill

o

Gs

SGD

G D S

11 y2 n s2,/Jl~s1

G2 GI

DIODES

~

DIODE SYMBOL

ANODE CATHODE

[~ c~~grg"-

~'

!

CATHODE

'

A THODE

~ o~ i

~

)i'

CATHODE

Bl-POLAR TRANSISTORS

BLACK EPOXY (PLASTIC) TRANSISTORS f

ECB

~i~ r

ECB

EB C

METAL CASE TRANSISTORS

DUAL

Figure 5-4. Transistor Biasing and Operating Characteristics

Model 432A

Section V

Maintenance

Table 5-6. Etched Circuit Soldering Equipment

Item Use Specification

Item Recommended

Soldering Tool Soldering, unsoldering Wattage rating: 37. 5

Tip Temp: 750-800°F

Tip Size: 1/8" OD

Ungar #776 handle with

Ungar #1237

Soldering Tip,

General Purpose

Soldering, unsoldering

Shape: chisel

Size: 1/8"

Ungar #PL113

De-soldering Aid Unsoldering multiconnection Suction device to remove mol-

Soldapult by the Ed syn components ten solder from connection

Company, Arleta, Calif.

Resin (flux) SolRemove excess flux from Must not dissolve etched circuit Freon, Acetone , Lacquer vent soldered area before applibase board material or conduc-

Thinner, Isopropyl Alcocation of protection coating tor bonding agent hol (100% dry)

Solder

Protective Coating

Component replacement, cirResin (flux) core, high tin concuit board repair or wiring tent (60/40 tin/lead), 18 gauge

(SWG) preferred

Contamination, corrosion protection after soldering

Good electrical insulation, cor-

Krylon #1320*, Humiseal rosion-preventive properties

Protective Coating, Type

1B12 by Columbia Technical Corp., Woodside 77,

New York

*Krylon, Inc. , Norristown, Pennsylvania

5-42. In-Circuit Testing. In transistor circuit testing the most important consideration is the transistor base-emitter junction. Like the control grid of a vacuum tube, this is the control point in the transistor.

5-43. To check a transistor, first see if the emitterbase diode is forward-biased by measuring the voltage difference between emitter and base. When using an electronic voltmeter, do not measure directly between emitter and base; there may be sufficient loop current between the voltmeter lead to damage the transistor. Instead, measure each voltage separately with respect to a voltage common point (e.g. , chassis).

5-44.

If the transistor base - emitter junction is forward-biased, the transistor conducts.

If the diode is heavily forward-biased, the transistor saturates.

However, if the base-emitter diode is reverse-biased, the transistor is cut off (open). The voltage drop across a forward-biased emitter-base junction varies with transistor collector current. A germanium transistor has a typical base-emitter voltage of 0. 2-

0. 3-volt with 1-10 mA collector current and 0. 4-0. 5 volt with 10-100 mA collector current. In contrast, base-emitter voltage for silicon transistors is about twice that for germanium types; about 0. 5-0. 6 volt for low collector current, and about 0. 8-0. 9 for high collector current.

5-45. If the emitter base-junction is forward-biased, check for amplifier action by short-circuiting base to emitter while observing collector voltage. The transistor should stop conduction (cut off), which should shift the collector voltage close to the supply voltage. Any difference is due to current leakage through the transistor. In general, the smaller the current, the better the transistor.

If collector voltage does not change, the transistor has either an emitter-collector short circuit or emitter-base open circuit.

5-46. OUT-OF-CIRCUIT TESTING.

5-47. The two common causes of transistor failure are internal short- and open-circuits. Remove the transistor from the circuit and use an ohmmeter to measure internal resistance. See Table 5-5 for measurement data.

5-48. COMPONENT REPLACEMENT IN

ETCHED CIRCUITS.

5-49. General. Etched circuit boards are sensitive to heat and to scratches with sharp objects. This is because the conductors are plated onto the circuit boards and the plating extends through the component mounting holes. Whenever possible, avoid unnecessary component substitution; it can damage the circuit board and adjacent components. See Table 5-6 for recommended tools and materials.

5-50. AXIAL-LEAD COMPONENTS.

5-51. Resistors, tubular capacitors and other axiallead components can be replaced without unsoldering.

Cut the component leads near the body of

the defec-

5-13

Section

V

Maintenance

Model 432A

HP 412

HP 427A

HP 410C

HP 410B

Simpson 260

Simpson 269

Table 5-7. Safe Ohmmeter Range for Transistor Resistance Measurements

Safe Range(s)

Rxlk

Rx 10 K

Rx 100 k

Rx lM

Rx 10M

Rx 1 k

Rx 10 k

Rx 100 k

Rx lM

Rx 10M

Rx 100

Rxlk

Rx 10 k

Rx 100 k

Rx lM

Rx 100

Rxlk

Open Circuit

Voltage

1. 0

1.

0

1. 0

1. 0

v

v v v

1.0V

1. 3

1. 3

1. 3

1. 3

1.

3 v v v v v

1.1

v

1. 1

v

1. 1

v

1.1

1.1

v

v

1.

5

v

1. 5

v

Short Circuit

Current

1

100

10

1

0.1 mA

µA

µA

µA

µA

0. 57 mA

57

5.7

0.5

µA

µA

µA

0. 05 µA

1. 1

110

11 mA

µA

µ.A

1. 1 µA

0.11 µA l mA

0. 82 mA

Color

Lead

Polarity

Red

Black

Red

Black

Black

Red

Red

Black

Black

Red

-

-

-

-

-

+

+

+

+

+

Triplett 630

Triplett 310

Rx 100

Rxlk

Rx 10

Rx 100

1.

5

1. 5

v

v

1. 5

1. 5 v

v

3. 25 mA

325

µA

750

75

µA

µA

Varies with Serial

Number tive component, remove the component and straighten the leads left in the board. Wrap leads of the replacement component one turn around the original leads, solder the connection, and clip off the excess lead.

5-52. OTHER COMPONENTS.

5-53. Replace other components as follows: a. Remove defective component from circuit board.

Use a low - power soldering iron because excessive heat may lift a conductor or damage the board. b. Remove solder from mounting holes with a suction device or a wooden toothpick. DO NOT USE A

SHARP METAL OBJECT SUCH AS AN AWL OR

TWIST DRILL. SHARP OBJECTS MAY DAMAGE

THE PLATED-THROUGH CONDUCTOR. c. Shape the leads of the replacement component to match the mounting-hole spacing. d. Insert the component leads in the mounting holes and position it as the original was. DO NOT

FORCE LEADS OF REPLACEMENT COMPONENT

INTO MOUNTING HOLES. A sharp edge on the lead may damage the plated-through conductor. e. Solder the component in place and remove excess flux from the soldered areas. Apply a protec-

tive

coating to prevent contamination and corrosion.

See Table 5-6 for recommendations.

CAUTION

Most ohmmeters can supply enough current or voltage to damage a transistor.

Before using an ohmmeter to measure transistor forward or reverse resistance, check its open-circuit voltage and shortcircuit current output ON THE RANGE TO

BE USED. Open-circuit voltage must not exceed 1. 5 volts and short-circuit current must be less than 3 mA.

5-14

Model 432A

Section VI

Replaceable Parts

SECTION VI

REPLACEABLE PARTS

6-1. INTRODUCTION.

6-2. This section contains information for ordering replacement parts. Table 6-1 lists parts in alphanumerical order of their reference designators provides the following information on each part: a. Description. b. Manufacturer of the part in a five-digit code; see list of manufacturers in Table 6-2. c. Manufacturer's part number. d. Total quantity used (TQ column).

6-3. ORDERING INFORMATION.

6-4. To obtain replacement parts, address order or inquiry to your local Hewlett-Packard Field Office

(see list at rear of this manual for addresses). Identify parts by their Hewlett-Packard stock numbers.

6-5. To obtain a part that is not listed, include: a. Instrument model number. b. Instrument serial number. c. Description of the part. d. Function and location of the part.

A

B

BT c

CP

CR

DL

OS

E assembly motor battery capacitor coupler diode delay lille device signaling (lamp) misc electronic pa.rt

A amperes

AFC automatic frequency control

AMPL

= amplifier

BFO

BE CU

BH

BP

BRS

BWO

= beat frequency oscilla.tor beryllium copper binder head bandpass brass backward wave oscillator ccw

CER

CMO

COEF

COM

COMP

COMPL

CONN

CP

CRT cw counter-clockwise ceramic cabinet mount only coefficient

common

composition

= complete connector cadmium plate cathode-ray tube clockwise

DEPC

DR deposited carbon drive

ELECT

ENCAP

EXT electrolytic

= encapsulated external

F

FH

FILH

FXD farads flat bead

!illlster bead fixed

G

GE

GL

GRD

" giga (109) germanium glass ground(ed)

01194-19

F

FL

IC

J

K

L

LS

M

MK

REFERENCE DESIGNATORS

!use filter integrated circuit jack relay inductor loud speaker meter microphone

MP p

Q

R

RT s

T

TB

TP

"

"

" mechanical part plug transistor resistor thermistor switch transformer terminal board test point

H

HDW

HEX

HG

HR

HZ

IF lMPG

INCD

INCL

INS

INT

K

LH

LIN

LKWASH

LOG

LPF

M

MEG

MET FLM

MET OX

MFR

MHZ

MINAT

MOM

MTG

MY

=

N

N/C

NE

NI PL henries bard ware hexagonal mercury bour(s) hertz

ABBREVlA TIONS

N/0

NPO

NPN

NRFR intermediate freq impregnated incandescent inelude(s) insulation(ed) internal kilo= 1000

NSR

OBD

OH

OX left hand linear taper lock washer logarithmic taper low pass filter p

PC

PF

PHBRZ

PHL

PIV

PNP milli

=

10-3 meg

=

1()6 metal film metallic oxide manufacturer mega hertz miniature momentary

'

mounting

1 mylar"

P/0

POLY

PORC

POS

POT pp

PT

PWV nano

(10-9) normally closed

neon

nickel plate

RECT

RF

RH normally open

= negative positive zero

(zero temperature coefficient) negative-positivenegative not recommended for

:field replacement not separately replaceable

"

" o:rder by description oval bead oxide pea.I< printed circuit picofarads

=

10-

12 farads phosphor bronze

Phillips peak inverse voltage positive-negativepositive part of polystyrene porcelain position(s) potentiometer peak-to-peak

= point peak working voltage rectUier radio frequency round head or right hand v

VR w x y z

vacuum, tube; neon

bulb, photocell, etc. voltage regulator cable socket crystal bmed cavity, network

RMO

RMS

RWV

W/ w

WIV

WW

W/O rack mount only root-mean square reverse working voltage

TA

TD

TGL

THD

Tl

TOL

TRIM

TWT u

S-B

SCR

SE

SECT slow-blow

screw

selenium section(s)

SEMICON ~ semiconductor

SI

SlL

SL

SPG silicon silver slide spring

SPL

SST

SR

STL special stainless steel split ring steel

VAR

VDCW tantalum time delay toggle thread titanium tolerance trimmer traveling wave tube micro= 10-6 variable de working volts with watts working inverse voltage wirewourul without

6-1

Section VI

Replaceable Parts Model 432A

Table 6-1. Replaceable Parts

Reference

Designation

HP Part Number

Oty

Description

Mfr

Code

Mfr Part Number

"102

Al03

Al04

A1'l5

AlOI>

AHH

Al08

"109

AlOl()

AllHl

Al012

Al013

A1014

Al015

AlRl

AlR2

AlR3

AIRS

AlR6

UR6

AlRl9

AlR2(l

HR21

AlR22

.AlR23

AlR24

AlR2S

AlR26

AlR27

AlR28

AlR29

AlR30

Hll.31

AlR32

AllBZ

.t.1R7

AlR8

.t.1R9

AlRlO

AlRU

A1R12

Allll2

AlRU

AlR12

A1Rl2

A1Rl3

AlRU

A1Rl3

AlRl3

.A1Rl3

AlR14

AlR15

AUU6

AlR11

Alll.18

Al

AlAl

Al Cl

AlC2

.AlC3

AlC4

AlC5

AlC6

AlC7

J11C8

AlC9

AlClO

Altll

A1Cl2

AlCB

AlC14

AlCRl

AlCR2

AlCR3

.A1'11

0698-U56

0757-0465

0698-3136

0698-3441

0757-0401

2100-1770

0757-0439

0698-3449

0757-0461

0757-0443

0698-316.Z

0811-.2284

0757-0199

0811-22&4

1901-0040

1853-00ZO

1853-0020

1853-0020

1854-0071

185'-0071

1853-00Cll

1854-0221

1854-0071 lll54-0071

1854-0071

1853-0001

1854-0221

185'-0071

1853-0020

1853-0020

0696-3260

0666-1055

0698-3160

0694-3160

0694-3160

00432-60024

00432-6011

0130-0374

0160-2055

0160-2055

0160-0380

0160-2055

0160-2055

Ol60-Z055

0160-0380

0160-2055

0160-3459

0160-3459

0180-0374

Ol6ChZ055

0160-2055

1901-0040

0698-3441

0698-3160

069&-31oO

06118-3156

07S7-0465

0757-0401

2100-1710

0757-0461

0811-2284

0757-0199

Otlll-2284

0757-0199

0698-3260

0757-0289

zz

3

2

9 l u

2

4

2

1

9

1

3

4

4

2

2

5

7 l l

2 a

2

BOAR!> ASSY:l!RIOGE

ASSYIAUTO LERO t:FXO TANT. 10 Uf lO:C 20YOCW

C•FXO

CER

0.01 UF +60-20:C lOOYOC~

C :FXD CER O.Ol UF +80-20% 100.VOCll

C:FXO MY 0.22 UF 10% 200\IOQ;

C :FXD CER O.Ol UF +80-2U lOOVDCW

C:FXO CER 0.01 Uf +80-20:C lOOVDO! c

•FXO CER 0.01 UF +ao-za:c lOOY~W

C: f XO KY o.

22 UF lO:C 2DOVDCW t:FXD CER 0.01 UF +80-2tl:C J.OQVDCW

C:FXO CER 0.02 UF 201 lOOVOCW c

•FXD CER a.oz

UF 20% lOOVDCW

CU'XO TANT• 10 UF lO'C 2QVDCW c

:FXD CER 0.01 UF +80-20: lOOVOCW t:FXD CER 0.01 UF +80-20¥ lOOVOCW ll lDDE : S ti.I CON 3014A 30WY

NOT ASSIGNED

OIOOE:SLL1CON 30M4 30WV

TSTR:Sl PIWISElECrfO FROM 2N37021

TSTlUSI PNPISELECTEO FROM 2N3702l

TSTR•Sl Plil'ISELECTEO FROM 211137021

TSTR•Sl NPNISELECTEO FROH 2N37D4l

TSTR:SI Hl'NISELECTEO fROH 2N37041

TSTR:SI PNPISELECTEO FROM

2HU3ZI

TSTR:SI NPNIREPL.8Y 2Nllt0441

TSTIUSI NPNISELECTEO FROM 21137041

TSTR•Sl NPNISELECTED FROM 2!07041

TSTR•.SI l\IPNISElECTEO Faol! 2N3704l

TSTR•Sl PNPISELECTEO FROM 21'11321

TSTR:Sl NPNIREPl..llY 211140441

TSTR•Sl NPNISELECTEO FROM ZN37041

TSTR•Sl PNPISELECfEO FROM 2N37021

TSTR•Sl PNPISELEC'fEO FROM 2N3702l

R :fXD MET FLK llt64K OHM 1" 118W

R•FXO COMP 1 MEGOHM 5l l/2W

R:Fxo MET FLM

31.~K

OHM l l l/8W

R:FXI) MET FLl4 3l.6K OHM U 1/811

R:FXO MET FlM 31.6K OHM U 1/8W-

NOT ASSIGNED

R:FXO MET FlM 14.7K OHM l l l/8W

R•FXO MET FUI lOOK OHM U l/8W

RIFXD MET FLll l7.8K OHM U 1/8W

IUFXO MET FlM.215 OHM U: 1J8W

IUFXO MET fLM 100 OHM l:C l/8W

R:VAR WW 100 OHK 5% TYPE H lW

R•FXO

llET FLK 6.au; OHM

(f()R OPT 013) u: l/8W

R:FlCO MET FLM Z8.7K OHM U -11811

IOPT 011)

R:FXD MET flM 68.lK Olill ll: 11811

R:FXO KET fLH U.OK OHM U -11811

CFOR OPT 0131

R:FXD MET FLM 46.4K OKM lit ll8W

IOPT OlH k>F)(O WW lK OHH O.l:C 1/40W

R:FXO KET FLM 21.5K OHll IS l/8W

R:FXD WW lK OHM 0.11 1"40W.

NOT ASSl&NEO

NOT ASSIGNED

R ;fXO MET FLM 215 OHM

i i

118W

R:FXO MET fLM 3l.6K OHM 11 1/8W

R•FXO MET FUI 3l.6K OHM u: 1/8w

R•FXO ME7 FLM 14.7K OHM ll: l/8W

R:fXO MET fLll lOOK OHM lit l/8W

R:fXO MET fl.M 100 OHM U l/8W

R:VAR WW 100 OHM 5S TYPE H lW

R•FXO MH Flll 68.lK OHM lie -l/8W

R<FXD WW 1K OHM O.l:C 1/4011

R:FXO MET FLM 2l.5K OHM l:C l/8w

IUFXO wW lK

()Iii!

O.l:C l/40W

R•FXO MET fl.II ;U.5K OHM 1% l/8W

R•FXO MET FLM 41!>4K OHM l l 118>1

R:FXO MET Fll4 U.lK OHM

(FOR OPT 012)

1t l/8W

See introduction to this section for ordering information

.28480

28480

56289

56289

56289

28480

56289

56289

56289

28480

56289

56289

56289

56289

56289

56289

07263

07263

28480

2811t80

28480

28480

ZB480

Z114BO

28480

28480

28480

28480

28480

28430

28480

28480

28480

28480

01121

28480

28480

28480

28480

28480

28480

28480

284.80

Z8480

26480

28480

28480

28480

28480

Z84BO

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

2S480

28480

28480

00432-60024

00432-6011

150Dl06X902082-0YS

C023F l01Fl03ZS22-COH

C023fl.Olf103ZS2Z-COH

0160-0380

C023Fl01F103ZS22-CDH

C023Fl01Fl03ZS22-COH

C023Fl01Fl03ZS22-COH

0160-0380

C023fl01Fl03lS22-COH

C023Fl01H203M5.22COH

C023Fl01H203MS22COH

1500106X902082-0YS

COZ3Fl01Fl03ZS22-COH

C023Fl01F 103ZS22-COH

FDG1088

FOG1088

1853-0020

1853-0020

1853-0020

1854-0071

1854-0071

1853-0001 l8511t-02Zl

1854-0071

1854-0071

1854-0071

1853-0001

1854-0221

1854-0071

1853-0020

1853-00ZO

Ob'i!S-3260

EB 1055

0698-3160

0698-3160

069ih3l60

0698--3156

0757-0465

0698-3l36

0698-344"1

0757-0401

2100-1770

0757-0439

0698-311t49

0757-0461

0757-0443

0698-3162

OSH-2284

0757-0199

01111-2Z84

0698-3441

0698-3160

0698-3160

()698-3156

0757-0465

07.57-0401

;2100-1110

0751-0461

0811-2284

0757-0199

0811-2284

0757-019q

0698-3200

0757-0289

Model 432A

Section VI

Replaceable Parts

Table 6-1. Replaceable Parts

Reference

Designation

HP Part Number

Qty

Description

Mfr

Code

Mfr Part Number

A2C20

A2C21

.AZC22

A2C.23

A2C24

A2C.25

/l2C2o

A2C21

A2C2!1

A2C29

.. 2c.>o

A2C.U

.A2C33

A2C34

A2C35

A2G36

A2C37

A2C38

A2C39

A2C40

A2C41

A2C42

"2C43

A2C4"

A2C45

AZC45

A2C45

A2C4b

A2C47

A2C46

A2C49

A2C50

A2CR1

A2CR2

A2CR3

THRU

Al1<32

AlR3Z

A1R32

A1R32

AlR33

AlR3"

AlP.35

AUBI>

AlR37

AlR38

AlP.39

AlRltO

AlR4l

AlR42

.AlR42

.AlR42

AlR42

AlR42

AlR42

AlR,.2

.61R42

,t.lR43

.AlR44

AlTPl

AlTP2

AlTP3 lllTP"'

AlTP5

AlTP6

AlTP7

AlTP8

AlTP9

AZ

A2Cl

A2C2

.A2C3

A2C4

A2C5

A2C6

0757-1>439

Ol>98-3449

0757-0465

0757-0465

0757-0442

0757-0279

0757-0279

0757-0279

07!17-0279

0693-3160

06.96-"160

0757-0199

)140-0234

0140-0234

018!>-1746

0140-0210

0160-0918

0160-2930

1)180-2178

0160-2930

0180-1940

01110-0197

0160-2672

0180-0197

0160-2917

0160-2917

0160-2150

0180-0229

0160-2917

0180--0106

0180-0197

0180-0197

0180-0106

0180-1114

0160-2253

0160-2930

0180-0229

0100-2911

1901-0026

1901-0026

1901-0026

0698-3455

2100-1618

0683-1855

0360-0124

0360-0124

0360-0124

0360-0124

0360-0124

0360-0124

0360-0124

00432-6015

0180-1819

0180-0229

0160-2917

0160-2917 l l

3

6

2 l

1 l

4

11

7

2 l

l1

20

R:FXO MET FUI 6.SlK OHM

U: l/8W

I FOR OPT 013)

R:fXO MET Fl.M 28.7K OHM

IOPT

OU) ti l/BW

RlfXO MET Fl.II lOOK OHM

.u

.11.8w

R•FlW Mel fLll lOOK OHM U 1/811

R<FXO llET fl..H 10.0K OHll l!l l/8W

R:FXO

MET FLll 3.16K

OHM ti l/8W

R:FXO llET FLM 3.16K OHM l i l/8W

R•FXO llH FUI 3.161<.

OHM

U ll8W

R:fXO '4ET flll 3.ll>K OHi! U 1/811

R :FXO llET FLM 3l.6K OHM l i J./8W

R:FXO MET FLM .U.6.K OHM U 1/8W

R:FXO llET FUI Zl.511 OHM l l l/8W

I FOR OPT 0121

R:FXD MET Fl.fl 11.0K OHM U 1181i

I FOR OPT 0131

R•FXD '4ET FUI ltl>.4K OH'4 U: l/8W

IOPT Olli

R•FXD MET FL!\ Zf>lK OHM

llC

J./8W

IOPT 0101

F<.:VAR Fl.II 1 11EGOHll ZOl LIN l/ZW

P.: FXO COMP l.8 MEGDHll 5t l/4W

TEll.llINAL:SOLOER LUG

TERlllNAUSOLDER LUG

PART OF PC 80Aao

TERMINALlSDl.DER LUG

PART OF PC llOARO

TERHU!IALl SOLDER LUG

TER'4lHAL:SOl.PER LUG

TERIUNAUSOLOER

LUG

TERMINAL•SOLOER LUG

BtlARO o\SSY:t.OGIC

C :FXO ELECT 100 UF +75-loi SOVDCW

C:FXO. ELECT 33 UF 1.0i lQVllC.11 c:Fxo CER 0.05 Uf +Bll-ZO:C J.OOVOCW

NOT

ASSIG/\IED

CIFXO CER 0.05 UF +80-20$ lOOVDC~

NOT ASSJGHED

NilT ASS IGNEO

C:FXO MICA 500 PF U

C:FXO MICA 500 PF U

C:FXO ELECT 15 UF 101 2QVDCW

C :FXO Ml CA 270 PF 51

C:FXO MICA 1530 PF

U

5QOVOCW

C :FXO CER O.Ol UF +80-20!11 lOOVOCW

NOT ASSJGlllEO

NOT

ASSIGNEO

C•FXD ELECT 220 UF 201 8YO<.W

C :H.O CEil. 0.01 Uf +80-20& lOOVDCW

C:FXO

HECT

33

Uf lOl;

U\IOCW

C:FXO ELECT 2.Z UF lOl; 20\lilCW

C•FXO llY o.on UF St 80VOCW

C :FXD ELECT z.z UF 10$ 20\/0CW

C:FXO CER o.as

UF +80-201 lOOVOCW

NOT ASSIGNED

C :FXO CER 0.05 UF +80-20i lOOVOCW

C:FXO >IICA 33 Pf 5%

C:FXD ELECT Jl UF 10% lOVDCW c:FKO

CER o.os uF

+80-zoi 1oovoc ..

C:FXO ELECT 60 UF 20% 6VOCW

C:Fl(O ELECT 2.2 UF lOZ ZOVOCW

C<Fl(O ELECT 2.2 Uf 104 20VOCW

C: fXO ELECT 60 I.If 20t bVOCW

C IFXO ELECT HO I.IF lO:C bYOCW

IOPT 011,012,0131 c:FXO

CER o.8 PF 500V[)CW

C.:Fxo CER 0.01 UF +80-20; lOOYOCW

NOT ASSIGNED

C:fXO ELECT 33 UF 10; lOVOCW

C •FXO CER 0.05 UF +80-ZOZ lOOYOCW

OIOOE:SILIC.ON 0.7SA 200P!V illOOE ISlllCON 0. 75A 200P.1V

OIGOE:SILICON o.75A 200PIV

See introduction to this section for ordering information

0757-0439

0698-3449

07§7-0465

0757-0465

0157-0442

0757-0279

0757-0219

0751-0279

0757-0279

0698-3160

0698-3160

0757-0199

0757-0443

0098-3162

0698-3455

2100-1618

C8 1855

0360-0124'

036Q-Qll!4

0360-0124

0360-0124

0360-0124

031>0-0124

0360-0124

00432-6015

Ol&0-1819 ouo-oz29

TYPE

TA

TYPE TA

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28 ... 80

28480

28480

28480

28480

01121

21480

2.8480

28480

28480

28480

28480

28480

28480

28480

28480

84411

84"11

28480

28480

28480

28480

28480

9l'tl8

56289

91418

562.89

56289

28480

56289

84"11

84411

28'tll0

26480

84411

28480

56289

5b289

284110

26480

72982

91418

28480

84411

04713

04713

()4713

0140-023"

0140-0234

0180-17"6

0140-0210

0160-0918

TA

1090:.?27X0008F 2-0YP

TA

1090336X9015C2.-0YP

1500225X90.<!0A2-DYS

0160-2.672.

1500225X9020A2-DYS

TYPE

TA

TVPE TA

()160-2150

0180-022'1

TYPE

TA

0180-0106

15002.25X9020A2.-0YS

15002.Z5X9020A2-0YS

0180-0106

0160-1114

301-NP0-6. 8 PF

TA

OHH>-0229

HPE TA

SR1358-8

SR1358-8

SR1358-8

Section VI

Replaceable Parts Madel 432A

Table 6-1. Replaceable Parts

Reference

Designation

HP Part Number Oty Description

Mfr

Code

Mfr Part Number

A<?Oll

A2Ql2

42\ll9

A21l20

42021

A2Q22

A2023

A2Q2't

AZQ25

A2'121>

A2UZ7

A2028

A2Q29 i12030

42031

AZQl

A202

A203

"204

AZ05

AZQo

11207

A208

A209

AZ010

A2CR4

AlCR5

A2CR6

AZC.Rl

A2CR8

AZCR9

AZC.11.10

AZCRH

A2CRl2

AZCR.U

A2CRl4

AZCR15

A2CRl6

A2CR1 7

A2CR18

AZCR19

A2CR20

A2CR21

A2CR22

AZCR23

A2Ql2

A2Qll

AZ034

A2Q'5 il2Q36

A2037

AZQ38

A2039

A2040

A20"1

AZ042

A2Cl43

A20"4

A2R1

A2R2

A2R3

A2R4

A2R5

A2RI>

.l2R7

A2RS

A2R9

A2Rl0

A21!H

A2Rl2

A2Rl3

AZl!14

A2tU~

A2Rl6

A2R17

1901-0026

1901-0026 l90Z-0509

1901-0026

1901-0026

1653-0020

1854-0005

1854-0071

1$54-0071

185'>-0005

1854-0071

1854-0011

1854-0009

1854-0009

1855-0062

1855-0062

185 .. -0071

U154-007l

1853-0015

1853-0020

1855-0062

1854-0071

1854-0071

1853-0020

1853-0020

1854-0071

1854-0071

0757-0279

0683-0685

0757-0835

07!H-Oit47

2100-1773

0757-0289

0757-0280

0757-0ltSS

0757-0ltOl

0757-0lt6S

0757-0442

0757-0'>47

0757-0442

0757-0279

0757-0198

1901-0026

1901-0026

1901-0026

1901-0026

1901-0026

1901-0026

1901-0026

1901-0026

1901-0026

1901-0021>

1901-0021>

1901-0026

1854-0071

18Slt-0062

11154-0071

1853-0012

1853-0020

1853-0020

1853-0020

1854-0071

185'>-0003

1853-0001

1854-0071

2

3 l l l

1

2 l

1

1

2 l

4

z

2

OIOOE:SILICON 0.75A 200PlV

OIOOE:SILICON 0.75A ZOOPlY

DIODE 8RfAKDOWNJ6.ZOV 21

OIOOE:SlLlC.ON 0.75A 200PIV

OJODE:Sll.ICDN 0.75A ZOOPlY

NOT ASSIGHEO

NOT ASSIGNED

OIOOE:S1l1CDH 0.75A 200PI\/

OIOOE•SlLICON o.75A 200PIV

NOT ASSIGNED

OJODE:SlllCON 0.75A 200PlV

DJtlQE:SILIUlf'I o.75A 200.PIV

OlOOE:SlLICOl> o.75A 200PlV

OJGOE:SiUCON o.75A 200PlV

OlCIOE:SlllCON 0.75A 20DP1V

DIDOE:SlllCON 0.75A 200PlV

OlOOE:SlllCON o.7$A 200PlV

OIOOE:SillCON 0. 75A ZOOPJV

O[ODE:SlLICON o.7SA 200PIV

OIOOE:SlllCON 0.75A 200PIV

TSTR:SI NPN(SELECTEO FROM ZN37041

TSTR: SI NPN

TSTR:Sl NPNlSfLECTEO flUlM 2N3704>

TSTR•Sl PNP

TSTR:SI PNPtSELECTEO FRDM 2N37Q21

TSTR:SJ PNP I SE LEC. TEO fROll 2N3702 l

TSTR:SI PNPISELECTEO FROM 2N370ZI

TSTR:SI NPNISELECTED FROM 2N37041

TSTR:SI NPtHSElECTED flUl/4 2Nl1lll

TS TR: SI PNPISELECTEO FROM 2Nl13ZI

TSTR:SI NPNISELECTEO FROM 2N37041

NOT ASSJGNEO

NOT ASSIGNEO

TSTR1St PNPISELECTEO FROM 2N3702)

TSTR:St NPN

TSHUSI NPN<SELECTEO FROM 2N37041

TSTR:Sl NPNt SELECTED FROM 2N37041

TSTIUSI NPN

NOT ASS! GNEO

TSTR•SI NPNISELECTEO fROM ZN37041

TS TR: SI NPNISELECTEO FR.OM 2N37041

TSTR: SI jojpN

TS TRI SI NP'I

TSTR:SI FET 30V

NOT ASS l&NEO

TSTR•SI FCT 30V

NOT ASSIGNED

TSTR:SI NPNISELECTED FROM 2N3704l

TSTR:SI NPNISELECTED FRDM .2N:H04)

TSTR:Sl PNP

TSTR:Sl PNPCSELECTEO FR.OM 2N37021

TSTR:Sl FET 30¥

TSTR:SI NPNISELECTEO FRON 2N3101tl

TSTR:Sl NPNCSELECTEO FR.OK 2N37041

TSTRISI PNPISElECTEO FROM 2N37021

TSTR:Sl PNPISElECTEO FROM 2N37021

TSTR:Sl NPNlSELECTEO FROK 2N37041

TSTRISI NPN(SELECTEO FRrn4 2113704)

R:fXO KET FLK 3.ll>K OHK U .l/8W

R:Fxo COMP 6.8 OHM 5% 1/4)1

RlFXO MET FlK 6.81K OHK 1:i: l/2W

NOT ASSl&f!IED

R:FXu MET flM 16.ZK Oltll 11 1/8N

R: VAR NW lK QliM 5:1: 1'.YPE H hi

R:FXD MET flit 13.3K OHM U l/8111

R:FXO KET flit lK OHK U

11 llW

R:Fxo KET flM 51.1~ OHM lg l/8W

R:FXD KET Fl.M 100 OHM U 1/8W lUFXO fo!ET Flit lOOK GHii l.i 1/811

R:FXD

KET FLM 10.0K OHM l i l/aw

R:FXO llET

FU! l6.2K OllN u

11aw

NOT ASSI&'IED

R:F XI.I MET F!.H 10.01< OHM n

11811

R•FXD HET fLM 3.1611 OHM l l l/8W

R•FXO MET FLM 100 OHM U l/2W

See introduction to this section for ordering information

04713

04113

04713

04713

04713

SRUSS-8

SR.13511-8

SZ50981t

SRU58-8

SRUSS-8

1853-0020

2111708

1854-0()11

1854-0071

21'1708

1854-0071

1854-0071

2N709

ZN709

21111595

ZNLS<JS

1854-00H l85't-0071

.21'13640

1853-0020

ZN1595

1854-0071

1854-0071

1853-0020

1853-00ZO

1851t-001l

185't-007l

0757-0279

C868G5

0757-Q835

0757-0447

2100-1173

0757-0289

0757-0280

0757-0458

0757-0401

0757-041>5

0757-0442

0757-0447

0757-044Z

0757-0Z79

0757-0198

SR1358-8

SR1358-8

SRUS8-8

SR1358-8

SR13511-8

SR1358-8

SR1358-6

SR1358-8

SR1358-8

SR1356-B

SRl358-8

SR13S8-8

1854-0071

21'11701

U54-007l

2N2904A

1853-00.i!O

1853-00ZO

1653-00.i!O

1854-0071

1854-0003

1853-000l

1854-0071

04713

Olt713

Oit713

04713

04713

04713

Olt713

04713

04713

Oit7l3

04713

04713

Z8480

80l3l

28480

80131

28480

21480

28480

28it80

28480

28480

28480

28480

80131

281t80

28480

60131

28480

28480

80131

80131

012!'!5

OU95

28480

28480 ao1:n

Z8480

01295

28480

Z8480

281t80

28480

28480

28490

28480

01121

28't8Q

28480

28480

28~80

28480

281t80

28480

Z8480

28480

Z8480

28480

Z6480

28480

Model 432A

Section VI

Replaceable Parts

Table 6-1. Replaceable Parts

Reference

Designation

HP Part Number

Oty

Description

Mfr

Code

Mfr Part Number

0757-0280

Ob91J-3Z6()

0757-0279

0698-311>0

0698-3428

0698-3160

0698-3260

0757-0442

0698-3260

0698-3260

0698-0084

01>83-1055

0698-3260

0757-0439

07 57-0"'42

0757-0461

0098-3160

0757-0442

0698-3438

0698-3156

0698-3160

0757-0401

0757-0199

2100-1769

0698-'<41>1>

0757-0346

0698-3160

01111-2277

0811-2277

0811-2537

01>98-3401

0698-3156

0757-0442

0757-0442

0698-3Z60

0698-3260

0757-04it2

0757-0442

0698-3156

0757-0397

0757-0199

0757-0442

0757-0465

0698-3266

D757-0461

0698-3160

0757-0405

0698-3155

0698-31!15

0757-0465

0683-1065

0757-1094

0757-0465

0683-1065

0698-3441

2100-1018

Obo3-l065

G757-0<>05

3101-0973

G3o0-0124

A2R66

A2R67

A2R68

A2R09

A2R70

AZR7l

AZR72

A2R73

A:ZR7<t

A:ZR75

A2R7b

112R77

.t.:ZR78

A2R79

1121l.HO

112R61

A2R8Z

A2fd!3

A2R84 il2k<IS

A2i<8o

A2R>i7

A2Ri!S

AlH

AZTPl

A2R'>8

A2R49

A2R50

A2RSl

1121<52

A2R53

A2R54

A2R55

A2R5<>

A2R:i6

A21<5'7

A2R58

A2R59

A2R60

AZRbl

AZR6l

A2Rbl

A.!Ro3

A2R.64

A2Rc5

A21U8

A2Rl9

.&2R20

A2i<2l

A2R22

A2R23

A2R24

1'2R25

1'2R2o

A211.27

A2R28

A2R29

112R30

112R31

A2R32

A2R33

A2R34

A2R35

A2R3o

;12R37

112R38

A2R39

A2R1>0

A2R4l

112R42

A2R43

A2R44

1121<45

A2K46

A2R47 l

4

3 l l

2 l l l l

14

3

1 l l l

1

R•FXD llET FLM 215 OHM 1.1 1/.211

NOT 4SSl6NEO

NOT A.SSIGNEO

R<FXD MET FLll a.7K OHM U l/SW

R:FXO llfT FLll 10.0K OHM U .l/8W

R:FXO MEl FLM 10.0K Olill u

.uaw

R<FXD MET FLM 464K OHM

R:F.XO MET Fl.II 464K OHK

R<FXO

•U ll8W

.u l/8W

MET

FLM 10.0K OHM U l /

!UFXD ML'T FUI 10.0K OHM U l/8l4

R•FXO llET FLM 14. 7K Olil'I U 1/ 8W

R:FXO HST fl.II c>S.1 OHM 11 ll8W

!'IDT ASSIGNED

NOT ASSIGNED

R:FXO MET FLM 21.5K OHM U .l/8W

R:FXO MET FLM 10.oK OHl'I U l./8W

R:FXD MET Fl.II lOOK OHM U 1/ 8W

RIFXll MET FU! 237K OHM U !/SW

R!fl([) MET Fl..M 68.11( OHll U 1/8"

!UFXD MET FLK n.i.11 OHM a; 1/8W

R:FXO MET FLM lOOK OHM U l/8W

R:Fxo MET fU4 4.6411 OHll U: l/SW

R:FXO MET FLM 4.6411 OHM U; l/8W

R:FXO MET FLM lDOK OHM U\ 1/8W

R:FXD COMP lOM OHM 5l; l/4W

R>FXO MET FUI l."7K OHM U l/8W

NOT ASSIGNED

NOT ASSIGl><eO

R:FX!l MET FLM 10011 OHM J.t l/8W

R:FXD COMP 1011 OHM SC 1/4W

NOT ASS lGNED

NGT ASS lGNEO

R:FXil llET FLM lK OHM U l/llW

11.:FXO MET HM t,6t,I( OHM U l/8W

R•FXO MET FLM 3.l6K OHM lC l/8W

J!:FXD f'IET FLH 3l.6K OHM

U: l/BW

R:FXD MET FLM 14.7 OHll U J./BW

R:FXD llET FLll 3l..4ll OHM lC l/BW

R:FXO llET FLM 4641( OHM U l/8W

FAtTORV SELECTED PART il.:FXO llET FUI 10.0K OHM 11( 1/8W

RIFXD MET FUI "64K OHM U l/8W l!:Fxo llET Fl.II 46t,K OHM u:

11811

R:FXD MET FLM 2.l5K OHM

11(

1/8W

IUFXD COMP l ,MEGOHM 5C l/4W

NOT AS.SIGl'IEO lllOT ASSIGNED

R:FXO MET FLM '>~'+K OHM

U:

1/8W

R:FXO HET FU! o.81K OHM UI l/8W

RlfXO MET Fl.JI 10.0K OHM U •l/8W

R:FXO >IET FLH 68. lK OHM u: l/80I l\:FXO MET FLll 3l.6K OHll U l/SW

R:FXO

MeT fLll 10.0K OHM U; l/8W

R:FXO MET FLK 147 OHM U l/BW

R:FXO llET FLM 14. 7K OHM UC l / lUFXi>

MET

FLM :U.6K OHM U J./ 8W

R:fXD MET FL'! 100 OHM u vs•

R<FXO MET FLP! 21.5K OHM U: l/8W

!\:VAR WW 50 OHM 5¥ TYPE H lW

R:Fxo MET FLM 976 OHM U l/8W l\:fXO MET FUI 10 OHM U 1/BW

R:FXO MET FLll 3l.6K OHi! U 11 SW

R•FXO WW lOK OHM o.1c 1/40W

R<FX() ilW lOK OHM O.U ll40W

R:FXD ilW 5K OHM

O.l~ l/40W

NOT ASSlGlllEO

NOT ASSlGNEO

R:FXO MET flM ll5 OHM U l/8W

NOT ASSIGNED

NOT ASSIGNED

R: VAi<. FLM 1 '4EGOHM 20:1: LIN l/2W

R1FXD COMP lOM IJHH 5~ l/4w

R :FXO MET FlM 16Z OHM l t l/SW

SWITCH: SLIDE DPDT 0.5A i25\i AC/llC

TERM! NAL: SOLDER L\JG

See introduction to this section for ordering information

28480

28480

28480

28480

28480

28480

28'>80

28480

28480

28480

281'80

28480

28480

28480

28480

28480

28480

2848D

28480

28480

01121

28480

28480

01121

28480

28460

28480

28'>80

28480

28480

26480

28480

28'-80

28480

28480

01121

28480

28480

28480

28480

28480

28480

28480

28480

Z8480

28480

28'>80

28480

28480

28480

28480

28480

28480

28480

28480

28480

01121

28480

19121

28480

0757-0280

0698-3260

0757-0279

0698-3160

0698-3428

0698-3160

Oo98-326D

0757-0442

0698-3200

0698-3260

0698-008 ...

CB 1055

OM18-3260

0757-04J9

0757-0442

0757-~61

0696-3160

0751-044Z

0698-3'>38

0698-3156

0098-3160

0757-0401

0757-0199

2100-1769

Ob98-4'<66

0751-0346

0698-3160

0811-2277

0811-2277

0811-2537

')698-3401

0!>98-3156

0757-0442

0757-0442

0698-3260

0698-3260

07'7-04'>2

0757-0442

0698-3156

0757-0397

0757-0199

0757-0442

0757-0465

01>98-3266

0757-0461

0698-3160

0757-0405

0698-JU5

0698-3U5

0757-0465

C6 1065

0757-1094

0757-0465 cs 1065

0698-3441

2100-1618 ca

1065

0757-0405

Gllb-0018

0360-0124

Section VI

Replaceable Parts Model 432A

Table 6-1. Replaceable Parts

Reference

Designation

HP Part Number Oty Description

Mfr

Code

Mfr Part Number

11704

A7Rl

A7R2

A7R3

A7R't

A7RS

A7R6

/>.7R7 nR7

A7R8

AS ji6

A7

/1.1

A7Cl

.ucu

AlCRZ

A70l

A702

A70:i

,;i4RS li4R6

MtR7

A4R8

A4R9

A4Rl0

A4R11

A4Rl2.

A4Rll

.\4Sl

A31U

A3RZ

Aii\Rl

A3R4

113Sl

A4

A41U

A4RZ

A4R3 li4R4

AZTP2

A2TP3

A2TP4

A2TP5

AZTl>6

A2TP7

A2TP8

A2TP9

112TP10

113

OO<t32-6007

Ol6Cl-2930 l901-0CIZ6

19 02-ll O<t8

185.r,-0039

1853-0020

1854-0071

1854-0071

01>98-3635

0757-0280

0757-o31to

0757-0439

0757-0280

0757-0199

0698-3156

2100-1776

0360-0124

0360-()124

0360-0124

0360-0124

0360-0124

Q360-0lZ4

0360-0124

O:il60-QlZ4

0360-0124

00432-6003

0811-2531>

081l-ZZ84

0811-25;:14

0811:-2535

3100-2't70

00432-oOO<t

O:'f!l.7-0346

0757-03"6

0757-0346

0757-03"6

07S7-D3"6

071>7-0340

D757-0346

0757-0346 o757-o3<t6

0757-0346

0757-0346

0757-0l'to

0698-6635

3100-2~9

TERMINAL:SOLOER LUG

TERMINAL:SOLDER

LUG

TfRMINAL:SDLOt:R LUG

TERHINALISOLOER

LUG

TERHINAl•SOlDER LUG

TERHINAL:SOl.OeR LUG

TERMINAL:SOLOER

LUG

TERMINAL:SOLDER LUG

TERMINAL:SOLDER

LUG

SWITCH ASSY :RANGE

R:FXD WW 3167 OHM O.li l/<tOW

RtfXD WW lK OHll D.li l/'tOW

R•FXO

WW

314.3 OHM

0.11 l/40W

RIFXD

WW llt5.0 OHM

O.U 1/A>OW

SWITttt: ROTARY

SWITCH ASSHCAll&aATlON FACTOR

RlFXO MET flM 10 OHM U l/&W

R:FXD MET FlM 10 OHM l* l/SW

IUFXD MET FLM 10

0HH

U l/SW

R:FXD MET fl.M 10 ,01U4 U l/l!W

R:FXD MET FLM 10 OHM U ll8W

R:FXD MET FLM 10 OHM U 1/&W

RIFXO MET FLH 10 OHM 11 l/8W

R:FXD MET FLM 10 OHM U l/BW

R:FXD MET FLll 10 OH!ol U l/8W

IUFXO MET fl.II 10 OHM l l lll!W

R:FXO MET FLM 10 OHM

R:FXO tit ll8W llET

FLM lD OHM U l/8111

R•fXO NET fLll 8110 OHi!

SWITCH: ROTARY

1* ll8W

NOT ASSIGNcO

NOT ASSIGNED

BOARD ASSY:flA1TfRY CHARGER

IFOR OPTION OOH

C•FXO CER 0.01 I.IF +eo-2oi 100VOCW

OIODE•SILICON 0.75A 200PIV

DlilOE•8REAKl)OllN o...lllV n

TSTR•Sl

Nl'H

TSTIUSI PNPISELECJEO FROM ZN370ll

TSTR•SI NPNISELECTEO flWM 2N370itl

TSTR•SI NPHISELECTEll AAOll 2Nl704l

R:fXO MET OX 680 OHM 51C 2W

R:FXO MET FLM lK

OHM

U l/8W

R•FXO MET FlM 10 OHM

R:FXO MET

U l/SW flM

6.81K OHM

11 1/SW

R:FXO MET FLM lK OHM 1' l/8ioi

RtFXO MET fLM 21.~K OHM l t 1/6W

R:FXO l'IET FlM 14. 7K OHM U l/8W

FACTORY SELECTED PART

R•VAR

WW lOK

OHM 51 TYPE

H lw

28460

91418

O't71l

04713

8Dl31

21:1460

281t60

28480

28480

281t80

281tBO

lBitSO

28480

281t80

28480

28480

28480

28'+80

28480

281t80

281t80

28480

281t80

281t8D

28't80

28480

28480

28480

.;!8460

28480

28480

28480

211480

28480

284110

28480

28"80

28480

28480

28itli0

28it80

28'<80

28480

28480

28'<80

28it80

0360-0124

0360-0124

0360-0124

0360-0121t

03b0-0l2<t

Oll>0-0124

0360-0l21t

0360-0124

0360-0124

0Dit32-6003

0811-2536

0611-2284

0811-253"t

0811-2535

31D0-2it70

001t32-6004

07S7-031t6

0757-0346

0757-0lltb

0757-0346

0757-031t6

0757-03'+6

0757-0346

0757-0346

0757-0346

0757-0346

0757-034<>

0757-031t6

0698-6635

3100-2469

00432-6007

TA

SRl358-8

SZ10939-l34

2N3i>53

1853-0020

1854-0071

1654-0071

0698-31>35

0757-0280

0757-031tb

0757-0it39

0757-0280

0757-0199

0698-3156

2100-1111>

See introduction to this section for ordering information

81 el

Cl

CZ

CZ

DSl

Fl

Jl

Jl

J2

J3

J4

J5

J5

Ml

MPl

~Pl

MPl

MPZ

R3

R4

R5

R6

R7

AB

R9

RlO

RlO

RlO

RlO

RlO

RlO

RH

RU

MP3

MP3 llP4 llP4 llP5

MP6

"Pb llP6

MP7

MPS

~P9

Al

Al

Rl

R2

Sl

Sl

S2

52

S3

Rll

Rll

Rll

Rll

1U2

U2

Rl3

RB

Rl4

S3

B

54

54

S4

1'1

•l wl

.. 1

• l

1420-0062

0160-3043

0180-0197

2140-0244

2110-0.Z34

1251-1280

00432-2005

1250-0118

12·50-0118 l25o-Oll8

1251-2357

1120-1497

0370-0077

0370-0193

0370-0432

5040-0345

504o-0702

0403-0131

0403-0026

00432-0005

00432-0006

0002-0007

00432-0011

2100-2849

2950-0034

00432-2004

0811-2538

0811-2538

0811-2538

0811-2538

0757-0984

0757-0984

0757-0198

0757-0458

0757-0200

0698-3151

0757-0317

0757-0288

0698-3155

0698-0084

0698-3156

0698-3158

0811-2277

3101-1395

3101-1234

3100-2485

00432-00031

3101-1357

00432-2003

8120-1082

8120-1083

8120-1084

Madel 432A

Section

VI

Replaceable Parts

Table 6-1. Replaceable Parts

Reference

Designation

HP Part Number

Qty

Description

Mfr

Code

Mfr Part Number

1

1 l

1 l l l l l l l

1 l

1

1

1 l

1

6

6

2

1

1 l

1

1

4 l

1

1 l

1

1

1

3

1

1

2 l

CHASSIS

~

MISCELLANEOUS PARTS

BATTERY:RECHARGEABLE 24V

I OPT 0011

C:FXD CER Z X 0.005 UF 20& 250VAC c:Fxo Ei.ECT 2.2 UF 10& zovoc:w

IOPT 011, 012. 0131

LAMP•GLOW MINIATURE 95V

FUSE:O.l AMP 250V SLOW-BLOW

CONNECTOll:AUDlO

b

FEMALE COHTACTS

NUT: CONNECTOR

CONNECTOIUBNC

CONNECTOR•8NC

C ONNE c Toa: 8NC

SOCKET:3-PIN MALE POWER RECEPTACLE

(PART OF REAR PANELi

METER

KNOB:SKlRTED BAR FOR 0.250• DIA SHAFT

I RANGEi

KNOB:ROTARY POINTER SLACK

ICAL FACTOR)

IOI08: BLACK LEVER

IMT. RES.I

INSULATOR:CONNECTOR(L!GHT GRAY)

INSULATOR:CONNECTOR(BLACK)

GUIOE:P.C. BOARD, GREY

GUOE:NYLON

IOPT OOU

BRACKET :TRANSFORllER

DECK: LOWER

DECK: UPPER

BRACKET:FRAME

R:VAR WW 50K OHM 3% LIN 2W

NUT:HEX BRASS 3/8-32 X 1/2•

BUSHING:PANEL.

R:FXO WW 100 OHM o.~z

1/lOW

R:Fxo WW 100 OHM O.U: l/lOW

R:Fxo WW 100 OHM O.l& l/.lOW

R:FXO WW 100 OHM o.1z l/lOW

R:FXO MET FLM 10.0 OHM 11 l/ZW

R•FXD HET FLM 10.0 OHM U l/2W

R:Fxo MET FLM 100 OHM

U: lJ.2W

R:FXD HET FL'4 51.lK OHM lZ l/SW

R:FXO MET FLH 5.62K OHM 11 l/8W

IFOR OPT Olli

R:FXD MET FLM 2.87K OHM u l/8W

IOPT 0121

R:FXD MET FLM l.33K OHM

IFOR OPT Olli

R:FXO KET FLM 9.09K OHM

IFOR OPT Olli u l/8W u l/8W

R:FXO MET FLM 4.64K OHM

I OPT 0121

R:FXO MET FLM Z.15K OHM

IOPT 0131 u l/8W u

11811 l<:FXO MET FLM 14.TK OHM u l/8W

IOPT 0121

R:FXD MET FLM 23.7K OHM u l/SW

IOPT 0121

R:FXO W~ lOK OHM O.U l/.40W

SWITCH:PUSH8UTTON OPDT-08

IPl)WERI

SW[ TCli: SLIDE DPOT

I PART OF RE AR PANELi

SWITCH:LEVEK SINGLE SECTION

IHT.

RES.I

SwITCH PLATE

SWITCH: TOGGLE SPOT

IFINE ZEROI

NvT:ORESS

CABLE ASSY:5 FT

CABLE ASSY:SPECIAL PURPOSEllO

FT I

IOPT 0091

CAl!LE ASSY: SPECIAL PURPOSEl20 FTl

I OPT 0101

See introduction to this section for ordering information

28480

56289

56289

87034

75915

28480

28480

24931

24931

24931

82389

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

28480

1420-0062

29Cl4 7A-CDH

1500225X9020AZ-DYS

AlH

313.100/S

1251-1280

OO·BZ-2005

28JR 128-1

28JR 128-1

28JR 128-1

EAC-301

1120-1497

0370-0077

.0370-0193

0370-0432

5040-0345

5040-0702

0403-0131

0403-0026

00432-0005

00432-0006

00432-0007

00432-11011

2100-2849

2950-0034

00432-2004

0811-2538

0811-2538

0811-2538

0811-2538

0757-0984

0757-0984

0757-0198

0757-0458

0757-0200

0698-3151

0757-0317

0757-0288

28480

28480

28480

28480

28480

76854

82389

76854

28480

()9353

28460

28480

28480

28480

0698-3155

0698-0084

0698-3156

0698-3158

0811-2277

53-67280-121/AlH llA-1242

TYPE 184

00432-00031

7109

00432-2003

8120-1082

8120-1083

8120-1084

Section VI

Replaceable Parts

Table 6-1. Replaceable Parts

Reference

Designation

HP Part Number

Oty Description

Model 432A

Mfr

Code

Mfr Part Number

lol lol kl lol

Wl lol lo2 lo3

XAl

XAl

XA2

XA2

Xlll

XBl

XBl

XFl

8120-1359

8120-13b0

8120-1361

8120-1348

00432-6010

1251-0172

1251-0172

00432-0008

00432-0009

1400-0084 l

1 l l l

2

1 l

1

THERMO CABLE: SPECIAL PURPOSE I 50 FT I

I OPT

Olli

THERMO CABLE:SPECIAL PURPOSE 1100 FTI

IOPT 0121

THE RHO CASL E:SPECIAL PUAPOSEl200 Ffl

I OPT 0131

CABLE ASSY:POWER, DETACHABLE

CASLE ASSY:POWER SWITCH

CONNECTOR:Pt EDGE 1 ROW

22

CONTACT

IPART OF LOWER OECKl

CONNECTOR:PC EDGE l ROW 22 CONTACT

IPART OF LOWER OECKl

BRACKET:BATTERV UPPER

I OP.T 0011

BRACKET:BATTERY LOWER

(OPT 001)

FUSEHOLDER:EXTRACTOR POST IYPE

28480

28480

28480

70903

28480

71785

71785

28'>80

28480

75915

8120-1359

8120-1360

8120-1361

KHS-7041

00432-6010

250-22-30-210

250-22-30-210

00432-0008

00432-0009

342014

See introduction to this section for ordering information

MOdel 432A

Section VI

Replaceable Parts

Table 6-1. Replaceable Parts

Reference HP Part Number

Qty

Designation

Description

Mfr

Code

Mfr Part Number

l

2

3

4

5

6

7

"

1

8

8

9

10

10 l l

11

5060-0703

1490-0031

5040-0700

5060-0727

502<>-0700

5000-0703

5000-8565

5060-0700

5000-85't9

5000-0711

5000-8571

00432-00022

0043Z-00021

00432-00033

5020-0704

5020-7433

CABINET PARTS

FRAME ASSYto X 11 SM

S TANIHTI LT

HINGE

FOOT ASSY

SPACER:

CASI

KET

SlllE

COVER-BLUE GRAY

S l DE

COl/ER-C'LIVE GRAY

TOP COVER-BLUE GRAY

TOP CO\IEll-ot.I\!E GRAY

BOTTOM COVER-BLUE GRAY

BOTTOM COVER-OLIVE GRAY

REAR PANEL

FRONT PANEL-LIGHT GRAY

FRONT PANEL MINT GllAY

METER TRHI:

LIGHT GRAY

METE!\ TRIM:

Ml NT GRAY

28480

28480

28480

Z8480

281t80

28480

.talt&O

ZIVtJIO

50lt36

28480

28480

50436

SO't36

S0..36

28"'80

28480

SOt>0-0703

1490-0031

5040-0700

5060-0727

5020-0700

5000-0703

5000-8565

5000-0l{)f,

5060-8549

5000-07ll

S000-8571

00432-00022

00432-00021

00432-000.U

5020-070'>

5020-7633

4328

Table 6-2. Code List of Manufacturers

M A N U F A C T J R E R S : O l E L I S T AS OF 06/ 03172

01121

Ol295

047l3

072ol oq353

?4'Hl

78480

5043"

56289

70903

7l 7e5

7Z9A2

75915

768'i4

797?7

80131

823'\9

6441 l

87034

91416

ALLE~ H~aDLEY en.

TEXAS

PISHU~F~TS

IN:.

~E'!ICJN)U:rn• CJ~?O'lo~rs ~Iv.

MUTJR(<L A Sfl'IC~NOLIC TO< P~O) .! N:.

FA!RCH!L!l

CA'!E•A & l'IST. CJ•P. SEMlC!INDu:rn~

DIV.

r l K

COM?ON!NTS

INC.

SPfC !AL TY

Ul'\INF:Tn~

:o. I

'I:.

HFolfTT-PACK•Rn CD. CO<PO<ATE ~o

HfwlFH-PACkAPO ro.

~ICROwAVE DIV

SPUGUF Elff.TRIC en.

Aft Of.N (~RP.

Cl~CM ~FG. fJ.

11V TRW INC.

ERIE TECHNJLJGICAL P<PJ. !'IC.

L

ITTEL FUSf

!'IC. llAK MFc •• C'J. DIV. JA~ Hr:n;J/'\IETI:s C3•P.

CONT!NFNTM -~!RT FLF:TRON!:S CJ~•.

ELFCTPONIC l~()USTRIFS

4SSOC!AT!n'l

S•lffflC~AFT

INC.

TR~

CAPACITO<

~AR:OAK

O!V.

!NOUSnTFS onrn 'IATERIALS co.

AOORESS

Ml LWAJKEE,

~IS,

OALLAS, TEX,

PHOENIX. AHZ.

MOUNTAI~ VIEW, CALIF.

'4EWTON,

MASS. l~OIA~A•OLIS. nw.

?ALO t.LfO, CALIF.

PALO Al TO, CAL IF

N.

ADAMS, 'iASS.

Ct!ICAGO, !LL.

ELK

G~OVE

VILLAGE, IU.

ER.IE, PA.

DES PLAl1ES, Ill•

CRYSUL LAKE, ILL. tiAqf'II~ST!:•,

PA.

WASHI'lGTO'l O.C.

C~!CA:>3.

ILL.

)GAllUA, ~E8R.

ANAHEl11, CALIF.

C.·HCAGO, lLL.

See introduction to $his section for ordering information

HGE

ZIP

CODE

53204

752:31

85008

94040

02158

46Z27

'14304

94304

OU47

60644

16512

60016

60014

16974

20006

60630 i>'H~3

92803

6064b

Model 432A

Section VII

Troubleshooting, Schematics

SECTION VII

TROUBLESHOOTING, SCHEMATICS, AND

COMPONENT LOCATIONS

7-1. INTRODUCTION.

7 -2. This section contains trouble shooting instruc tions, schematics, and component locations for th e power meter. Also included is an overall block diagram that indicates the location of test points in the instrument.

7 -3. Reference designations shown within circuit card outlines are abbreviated. To find the part in the Parts

List, use the full reference designation. For example,

R6 on the A2 Meter Logic Assembly is listed as A2R6.

7

-4.

The Schematic Notes in Table 7 -1 pertain to all the schematics. Additional notes on the schematics indicate test conditions, and special information for use when maintaining the instrument.

7-5. TROUBLESHOOTING.

7 -6. Table 7 -2 is the Overall Troubleshooting chart for the power meter. Procedures for isolating circuit malfunctions to specific stages are based on the use of the HP 8477 A Power Meter Calibrator and the calibration procedures in Section V. The information obtained when calibration is attempted is u s e d to troubleshoot the instrument.

7 -7. Table 7 -2 contains references that direct the user to the detailed troubleshooting charts, Tables 7-3 through 7-11. The detailed charts refer the user to transistor stages.

In a few instances, specific parts are called out as being possible causes of circuit malfunction, however, the troubleshooting charts are not intended to locate specific parts that have failed. They are intended to locate only malfunctioning stages.

7-8. SCHEMATICS.

7-9. The schematics contain signal routing information, nominal voltage levels, and notes that assist in understanding the circuit. They are laid out to show electrical operation, and are not intended as wiring diagrams.

7 -10. Component location photographs n ext to the sche:matic foldouts indicate the physical location of parts. Test points are also shown, and are marked on the schematic in the same manner as they are in the meter.

7-11. Factory selected parts are indicated by an asterisk. These are components that generally are installed to fulfill circuit operation requirements. They may be the nominal value, or they may be some value close to nominal. In any case, if the component fails, circuit operation should be verified after these components are replaced.

7-12. A1A1 AUTO ZERO ASSEMBLY.

7 -13. The Auto Zero circuit is encapsulated and must be replaced as a unit. A solder removing tool, such as the Soldapullit suction device listed in Section V, is required to remove solder around the leads. After solder is removed, the unit must be carefully removed from the circuit card in such a manner that the circuits on the card do not delaminate. After the Auto Zero assembly is replaced, perform the adjustment procedure given in Section V.

7-14. TEST CONDITIONS.

7-15. For most tests of circuit operation when troubleshooting the instrument, the troubleshooting charts call out control settings.

In special cases, notes on the schematics indicate control settings required to measure voltage levels in circuits. Generally, the following control settings sh o u 1 d be selected, and ch an g e d on 1 y as the troubleshooting procedures indicate:

RANGE........................ . 3 mW (-5 dBm)

MOUNT RESISTANCE ......... 200 (Mount installed)

CALIBRATION FACTOR ....................... 100

COARSE ZERO ...... turn until meter is at full scale

7-1

Section VII

Troubleshooting, Schematics

Table 7-1. Schematic Notes

1. Resistance in ohms, capacitance in microfarads unless otherwise indicated.

2.

Sbewdriver adjustment

0

"

Front panel control

3.

D

Front panel designation

.---,

I

I

L---.J

Rear panel designation

4.

-----

Printed circuit card border

Main signal path

Secondary signal path

Secondary feedback path

7-2

5.

P/O

= part of

6 .

Wiper moves toward CW when control rotated clockwise

~cw

7.

•

8.

-©

9.-®-

Test point. Number in circle matches number on printed circuit card.

Breakdown diode

Tunnel diode

10. (947)

Wire color code. Numerical color code same as resistor coding. For example,

947 denotes white, yellow, violet wire.

11.

XAI

I

7A1-

Indicates socket connections and pin numbers.

Model 432A

Model 432A

MeasJ.rement Conditions

1.

.3 mW

TEST POINT MEASUREMENT CONDITIONS AND VOLTAGES

2. 200 ohm mount

3. 100% CAL FACTOR

4. COARSE ZERO turned to get full-scale deflection

5. Measurements made with respect to CHASSIS GROUJ\i"D

Test Point Voltages

Test Point

AlTPl

A1TP2

A1TP3

A1TP4

A1TP5

A1TP6

A1TP7

A1TP8

AlTP9

Voltage

+5.2

+5.2

+2.7

... 2.7

+2.7

-'-2.7

-'-1.

2

-6. 5

-'-4 mV

A2TP1

A2TP2

A2TP3

A2TP4

A2TP5

A2TP6

A2TP7

A2TP8

A2TP9

A2TP10

Waveform

Waveform

+7 Nominal

-13 Nominal ov

Waveform

Waveform

Waveform

Waveform

Waveform

A7TP1

A7TP2

+1 Variable

+

1. 6 Variable

Notes

RANGE to COARSE ZERO, meter zeroed

Varies from 0 to -13 V under normal operating conditions

Thermistor ground

Figure 7-3

Figure 7-3

Chassis Ground

Figure 7-3

Figure 7-3

Figure 7-3

Figure 7-3

Figure 7-3

M o d e l 432A

+2.7V {

+5 .

2V

+27V [

ASSY Al

ASSY A2

Figure

7-4. Model 432A Test Point Locations

ASSY A7

Model 432A

TABLE 7-5.

AUTO ZERO CIRCUIT P/O A1 TROUBLESHOOTING

MEASURE

VOLTAGE AT

Al TP8, TURN-

COARSE ZERO

C\1

&

CC\'I:

VOLT

@

TP8

LIMITS AT: cm -11.sv

rn

+

.4V

NO CHECK QLQ2,

&

ASSOCIATED

CIR CU !TRY

SET

RANGE

Svl!TCH

CHECK

VOLTAGE

YES TO

COARSE

ZERO

-AT

AlTPS

~

-GV

SET RANGE

SWITCH TO

10

MVI,

MEASURE VOLTS

AT TP7, WHILE

DEPRESS I NG FI NE

ZERO, ROTA TE

YES COARSE ZERO THRU - - - BAD -

ITS RANGE·

CCW -6.5V rn

+4. sv

CSHOULD BE AT LEAST

8V VARIATIONJ

CHECK

NO Q3

REPLACE

SEALED FET

ASSEMBLY i\lAl

TABLE 7-6.

CHOPPER P/0 A2 TROUBLESHOOTING

CHECK lOOK RESISTOR

OK BETWEEN BASE WHERE

~Q.

&

.01 CAPACITOR

WAVE IS BAD AND A2TP2 OR COLL Q21

BAD

CHECK A2rP2

&

COLLECTOR

Q21

VRF

&

VcoMP

OK

SIG~IAL AT

A2TP6

BAD

CHECK 5KHZ

-AT GATE OF

Q30, Q32

MULTIVIBRATOR TROUBLESHOOTING

BAD TABLE 7-7

CHECK

OK Q30, Q32

SERVICE HINT: IF TROUBLESHOOTING CHOPPER FOR NOISE, LIFT END

OF C29

&

C31 AND SEE IF NOISE PERSISTS.

Model 432A

**ADDED F OR LONG CABLE OPT IONS ( 11, 12 l

CV a: u a:. u

015 ti)

0

CV -

.., 0

CV N

C\I N a: a: a: a: in

Cl)

U> a: a: a:

,.... a;

Q J O

'""

~

Q5

04

'

02

:

'3

·

·

~

1, ot4

06

AIAI

AUTO-ZERO

CIRCUIT

~~~ o:: .

Q3

..

02

~

Ir:

::l'

Q I

-0

Figure 7 7. Al Bridge Ass e mbly Co mpon ent Locatio n s

RECORDER

J4 RB

.

.

'

S2

115 /230

R6

J5

LINE

INPUT

•

R7

Figure 7-8. 432A Rear Panel Interior

Model 4 32A

G>-

_,. Q_

~

~

~

"'°

om:

~

R2J

CBJI w

02,2 a2.5

R2£

Q.23

~

'C M

CRf.6

C RIS

R ~ R"87

C2

5 '

Q2;6

R34

-

CRLI

CR20

OZ7

~

028 u

R7~

-

R86 ozo

029

R.C~

C44

C43

SI

~

R46

'CU

C30

Q~,2

~2 8 t i f

CR17

~~

Cftl.3 lil3 5

R37

R 38

4139

..A

JW

R

~ U

C R19

C41

C 2:3

~3

CR22

R41

C26

R6v

RH

-.R56

R65

R5.7

R77

R66

R67

C39

R42

R68

C45

C29

Q34

Q 35

0 37

039

'Rn

Q38

C R15

873

R74 c ~

R72

040

R65

Q41

,.R83

Q42

Q44 Q43

-

C40

R68

R29

C31

R.50

~7 6

R43

R'19

Q30

R78

Rao

0.3

R.5.4

C34

J.1----e

Q 3 6

C46

-R58

59

C38 a63

~i

R&4

R69

R 7 0

0

-0

C49

C47

C42

22

Figure 7-11. A2 M e ter Logic Assembly Comp onent

Locatio n s

Model 432A

APPENDIX I

MANUAL CHANGES

(22 OCTOBER 2007)

Notification

Obsolescence of Model 432A- 100

The Reason for Obsolete Model 432A- 100

Model 432A- 101 was obsolete in November 2005 due to parts depletion.

Replacement product for Model 432A- 100

The Model 432A- 100 has been replaced with Model 432- 101 as this product supports

100 VAC line voltage input.

Ordering Information

Customers should place order for Model 432A- 101 instead of Model 432A- 100.

Appendix I

AI–1

Model 432A Appendix II

APPENDIX II

INSTALLATION OF LONG CABLE OPTIONS

AII-1. Information in this appendix describes installation of the long cable options used with the 432A Power Meters. Table AII-1 lists the options, cable length and stock numbers. After completion of the installation procedures, the power meter should be recalibrated using the procedures in Section

V

of this manual.

NOTE

These cable option kits are for mount resistances of either 100 or 200 ohms.

AII-2. Depending on the option selected, the following components are added or replaced with parts supplied with the option kits: a. C2 b. RlO, Rll, R12 and R13 c. A1R32 and A1R42 d. A2C45

AII-3. The following equipment is required for the installation of the long cable options: a. Soldering Tool, wattage rating: 37 .5 b. De-soldering aid c. Pozidriv screwdriver (small) d. Pozidriv screwdriver (medium)

Option

009

010

011

012

013

Table AII-1. 432A Power Meter

Long Cable Options

Kit Number

Cable Length

(feet)

00432-6018

00432-6019

00432-6020

00432-6021

00432-6022

10

20

50

100

200

AII-4. No substitution can be made for long cables listed in Table AII-1. Long cables from the older power meters, such as the 431 series, cannot be interchanged with 432A long thermistor cables because of resistance variations.

AII-5.

If

a long cable option of 20-feet or longer is used with a

balanced thermistor mount such as

the HP 8478B, pins 2 and 4 must be shorted at the mount end of the cable. This short can be accomplished with an 11527 A Adapter available from Hewlett-Packard. The 11527 A, connected between the mount and the cable, can be removed for instrument operation with an unbalanced mount.

NOTE

If

a 432A has been modified for a particular cable option, it is incompatible with all other cable lengths.

AII-6. The parts required for the modification are listed in Table 6-1 and shown on the appropriate

Service Sheet.

AII-7. OPTION 009 INSTALLATION.

AII-8. Option 009 (10-foot cable) requires no modification to the 432A Power Meter. The longer cable is substituted for the standard fivefoot thermistor cable.

AII-9. OPTION 010 INSTALLATION. a. Remove the right side and top covers from the 432A. Remove the Al Bridge Assembly circuit board from the instrument. b. Referring to Figure 7 -7, locate the board position where AlR42 is to be placed. Install the

261 K, 1 %, 0 .125W resistor, supplied with the kit, in that position. c. Place the modification decal on the top center of the front panel. d. This completes the Option 010 installation. Before replacing the top and side panels, connect the ten-foot cable and perform the bridge amplifier adjustments in Section

V

of this manual.

AII-1

Appendix II

Model 432A

AII-10. OPTION 011 THROUGH 013 INSTAL-

LATION. a. Remove both side, top and bottom covers. Remove the Al Bridge Assembly. b. Locate the printed circuit board eyelets in which A1R32 and AlR42 are to be placed by referring to Figure 7 -7. Note that one end of these resistors will be placed inside the guard rings that attach to the bases of A1Ql2B and AlQ7B.

There is a vacant eyelet provided inside the guard rings to make this connection. c. Install the correct value AlR32 and

AlR42 for the desired option. d. Place the 432A on its top; Figure 7-5 reveals the location of bridge resistors R3 and R5 on terminal strip XAl. Select the proper values of resistors RlO and Rll from the option kit. Solder

R11 across pins 3 and 5 of XAl in parallel with R5 and solder RlO across pins 6 and 8 of XAl in parallel with R3. e. Locate the MOUNT RESISTANCE switch 83 on the back of the front panel. Bridge resistors R2 and R4 are wired to the rear

oi

S3

(see Figure 7-6). Choose the resistors supplied with the option kit for Rl2 and R13. Solder R12 across R2 and Rl3 across R4. f. Capacitor C2 (2.2 µF) is connected across the rear of the FINE ZERO switch 84 (see

Figure 7-6). With the instrument resting on its top, wire the positive lead of C2 to the terminal of S4 with the white/black/violet (907) wire and the negative lead to the terminal with the violet

(7) wire. g. Remove the A2 Meter Logic Board.

A2C45 by referring to Figure 7-11.

Remove the 60 µF capacitor and replace it with the 300 µF capacitor supplied with the option kit. Observe the polarity as marked on the circuit board. h. Place the modification decal on the top center of the front panel.

i.

This completes the modification. Install the Al and A2 boards back in the instrument.

Perform the adjustment procedures in Section V of this manual with the long cable.

AII-2

POST-SALES / SUPPORT ADDRESS LIST

O

If you need technical assistance with a Hewlett-Packard test and measurement product or application please contact the

Hewlett-Packard office or distributor in your country.

Asia Pacific:

Hong Kong:

(852) 2599 7889

India:

(91-11) 682-6000

Japan:

Hewlett-Packard Japan Ltd.

Measurement Assistance Center

9-1, Takakura-Cho, Hachioji-Shi,

Tokyo 192-8510, Japan

Tel: (81) 426-56-7832

Fax: (81) 426-56-7840

Korea:

(82-2) 769 0800

Malaysia:

(60-3) 291 0213

Philippines:

(63-2) 894 1451

PRC:

(86-10) 6505 0149

Singapore:

(1800) 292 8100

Taiwan:

(886-3) 492 9666

Thailand:

(66-2) 661 3900

For countries in Asia Pacific not listed, contact:

Hewlett-Packard Asia Pacific Ltd

17-21/F Shell Tower, Times Square,

1 Matheson Street

Causeway Bay

Hong Kong

Tel: (852) 2599 7777

Fax: (852) 2506 9285

Australia/New Zealand:

Hewlett-Packard Australia Ltd.

31-41 Joseph Street

Blackburn, Victoria 3130

Australia

1 800 629 485

Canada:

Hewlett-Packard Canada Ltd.

5150 Spectrum Way

Mississauga, Ontario

L4W 5G1

(905) 206 4725

Europe, Africa and Middle East:

Austria:

(0)1 25000-0

Belgium and Luxembourg:

(02) 778 3417

Baltic Countries

(358) 08872 2100

Czech Republic:

420-2-4743111

Denmark:

45 99 10 00

Finland:

(90) 88 721

France:

(0)1 69.82.60.60

Germany:

(0180) 532 62-33

Greece:

30-1-7264045

Hungary:

36-1-4618219

Ireland:

(01) 284 4633

Israel:

972-3-5380333

Italy:

02 - 92 122 241

Netherlands:

(020) 547 6669

Norway:

(22) 73 57 50

Poland:

48-22-6087700

Portugal:

(11) 482 85 00

Russia:

(7/095) 928 6885

Fax: (7/095) 916 9844

South Africa:

27-11-8061000

Spain:

(34) 1 631 1323

Sweden:

(08) 444 22 77

Switzerland:

(01) 735 7111

Turkey:

90-212-2245925

United Kingdom:

(01344) 366 666

For countries in Europe/Middle East and Africa not listed, contact:

Hewlett-Packard

International Sales Europe

Geneva, Switzerland

Tel: +41-22-780-4111

Fax: +41-22-780-4770

Latin America:

Hewlett-Packard

Latin American Region Headquarters

5200 Blue Lagoon Drive

9th Floor

Miami, Florida 33126

U.S.A.

Tel: (305) 267-4245

(305) 267-4220

Fax: (305) 267-4288

United States:

Hewlett-Packard Company

Test and Measurement Organization

5301 Stevens Creek Blvd.

Bldg. 51L-SC

Santa Clara, CA 95052-8059

1 800 452 4844

October 2007

Errata

This manual may contain references to HP or Hewlett-Packard. Please note that Hewlett-Packard's former test and measurement, semiconductor products and chemical analysis businesses are now part of Agilent

Technologies. To reduce potential confusion, the only change to product numbers and names has been in the company name prefix: where a product number/name was HP XXXX the current name/number is now Agilent

XXXX. For example, model number HP8648 is now model number Agilent 8648.

Ce manuel peut contenir des références à <<HP>> ou <<Hewlett-Packard.>> Veuillez noter que les produits de test et mesure, de semi-conducteur et d'analyse chimique qui avaient fait partie de la société Hewlett-Packard sont maintenent une partie de la société Agilent Technologies. Pour reduire la confusion potentielle, le seul changement aux noms de reference a été dans le préfixe de nom de société : là où un nom de référence était HP

XXXX, le nouveau nom de référence est maintenant Agilent XXXX. Par example, le HP 8648 s'appelle maintenent Agilent 8648.

Diese Gebrauchsanweiseung kann Bezug nehmen auf die Namen HP oder Hewlett-Packard. Bitte beachten Sie, dass ehemalige Betriebsbereiche von Hewlett-Packard wie HP-Halbleiterprodukte, HP-chemische Analysen oder HP-Test- und Messwesen nun zu der Firma Agilent Technology gehören. Um Verwirrung zu vermeiden wurde lediglich bei Produktname und - Nummer der vo laufende Firmenname geändert: Produkte mit dem

Namen/Nummer HP XXXX lauten nun mehr Agilent XXXX. Z.B, das Modell HP 8648 heißt nun Agilent 8648.

Questo manuale potrebbe contenere riferimenti ad HP o Hewlett-Packard. Si noti che le attività precedentemente gestite da Hewlett-Packard nel campo di Test & Misura, Semiconduttori, ed Analisi Chimica sono ora diventate parte di Agilent Technologies. Al fine di ridurre il rischio di confusione, l'unica modifica effettuata sui numeri di prodotto e sui nomi ha riguardato il prefisso con il nome dell'azienda : dove precedentemente compariva "HP

XXXX" compare ora "Agilent XXXX". Ad esempio: il modello HP8648 è ora indicato come Agilent 8648.

Este manual puede hacer referencias a HP o Hewlett Packard. Las organizaciones de Prueba y Medición (Test and Measurement), Semiconductores (Semiconductor Products) y Análisis Químico (Chemical Analysis) que pertenecían a Hewlett Packard, ahora forman parte de Agilent Technologies. Para reducir una potencial confusión, el único cambio en el número de producto y nombre, es el prefijo de la compañía: Si el producto solía ser HP XXXX, ahora pasa a ser Agilent XXXX. Por ejemplo, el modelo HP8648 es ahora Agilent 8648.

䖭Ͼ᠟ݠ䞠䴶ৃ㛑৿᳝ᚴ᱂݀ৌⱘ䌘᭭DŽ䇋⊼ᛣᚴ᱂݀ৌҹࠡⱘ⌟䆩ˈञᇐԧѻ

કˈ࣪ᄺߚᵤ䚼䮼⦄೼ሲѢᅝ᥋Ӻ݀ৌDŽЎњޣᇥৃ㛑ⱘ䇃㾷ˈѻકোⷕ੠ৡᄫ

াᬍব᳔ࠡ䴶ⱘ݀ৌৡᄫDŽབᵰϔϾѻકⱘোⷕˋৡᄫҹࠡᰃ+3 ;;;;ˈ⦄೼ⱘ

োⷕˋৡᄫᰃᅝ᥋Ӻ ;;;;DŽ՟བ῵ൟোⷕᰃᚴ᱂˔˒ː˔DŽ⦄೼ᰃ῵ൟোⷕᅝ

᥋Ӻ˔˒ː˔DŽ

Document Part Number 5971-2668

Printed in Malaysia September 2004