HP 432A User manual

A
Document Part Number 5971-2668
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.
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Printed in Malaysia September 2004

Table of Contents Model 432A
ii
Section Page
I 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 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . 2-1
2-1. Initial Inspection. . . . . . . . . . . . . . . . . 2-1
2-2. Mechanical Check . . . . . . . . . . . . 2-1
2-4. 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. Battery Installation. . . . . . . . . . . 2-1
2-17. 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
III 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. General. . . . . . . . . . . . . . . . . . . . . 3-2
3-30. Measurement Procedure . . . . . . . 3-2
IV PRINCIPLES OF OPERATION . . . . . . . . . . 4-1
4-1. Simplified Description . . . . . . . . . . . . 4-1
4-5. Functional Block Diagram . . . . . . . . . 4-1
V MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . 5-1
5-1. Introduction. . . . . . . . . . . . . . . . . . . . . 5-1
5-3. Content . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5-4. Performance Tests . . . . . . . . . . . . 5-1
5-6. Adjustments. . . . . . . . . . . . . . . . . 5-1
5-10. Test Equipment . . . . . . . . . . . . . . 5-1
5-12. Service Information . . . . . . . . . . . 5-1
Section Page
V MAINTENANCE (Cont)
5-14. 432A Performance Tests with
8477A Calibrator . . . . . . . . . . . . . . . 5-1
5-15. Initial Setup . . . . . . . . . . . . . . . . . 5-1
5-16. Meter Accuracy Test . . . . . . . . . . 5-1
5-17. Calibration Factor Test . . . . . . . . 5-2
5-18. Meter Linearity Check. . . . . . . . . 5-2
5-19. Zero Carryover Test. . . . . . . . . . . 5-2
5-20. Fine Zero Range Check . . . . . . . . 5-3
5-21. 432A Calibration Without
8477A Calibrator . . . . . . . . . . . 5-3
5-24. Calibration Procedure 1. . . . . . . . 5-3
5-26. Calibration Procedure 2. . . . . . . . 5-9
5-27. Cover Removal and Replacement. . . . 5-9
5-29. Top Cover Removal . . . . . . . . . . . 5-9
5-30. Top Cover Replacement. . . . . . . . 5-9
5-31. Bottom Cover Removal . . . . . . . . 5-9
5-32. Bottom Cover Replacement. . . . . 5-9
5-33. Adjustment Procedures. . . . . . . . . . . 5-10
5-34. Initial Setup . . . . . . . . . . . . . . . . 5-10
5-35. Mechanical Meter
Adjustment . . . . . . . . . . . . . . 5-10
5-36. Bridge Amplifier Tests. . . . . . . . 5-10
5-37. Meter and Recorder Output
Calibration. . . . . . . . . . . . . . . 5-10
5-38. Battery Charger Adjustment
(Option 01 Only) . . . . . . . . . . 5-11
5-39. Battery Removal . . . . . . . . . . . . 5-11
5-40. Isolating Trouble in Transistor
Circuits . . . . . . . . . . . . . . . . . . . . 5-11
5-46. Out-of-Circuit Testing . . . . . . . . 5-13
5-48. Component Replacement in
Etched Circuits . . . . . . . . . . . . . 5-13
5-50. Axial-Lead Components . . . . . . 5-13
5-52. Other Components. . . . . . . . . . . 5-14
VI REPLACEABLE PARTS . . . . . . . . . . . . . . . . 6-1
6-1. Introduction. . . . . . . . . . . . . . . . . . . . . 6-1
6-3. Ordering Information . . . . . . . . . . . . . 6-1
VII 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
TABLE OF CONTENTS

Model 432A List of Tables
List of Illustrations
iii
Number Title Page
1–1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . 1–1
1–2. Thermistor Mounts for the 432A . . . . . . . . . 1–2
5–1. Recommended Test Equipment . . . . . . . . . . 5–0
5–2. Meter Accuracy Test . . . . . . . . . . . . . . . . . . . 5–2
5–3. Calibration Factor Test . . . . . . . . . . . . . . . . 5–2
5–4. Performance Test Card. . . . . . . . . . . . . . . . . 5–5
5–5. Out-of-Circuit Transistor Resistance
Measurements . . . . . . . . . . . . . . . . . 5–11
5–6. Etched Circuit Soldering Equipment. . . . . 5–13
5–7. Safe Ohmmeter Range for Transistor
Resistance Measurements . . . . . . . . 5–14
6–1. Replaceable Parts . . . . . . . . . . . . . . . . . . . . . 6–2
6–2. Code List of Manufacturers . . . . . . . . . . . . . 6–6
7–1. Schematic Notes . . . . . . . . . . . . . . . . . . . . . . 7–2
Number Title Page
7–2. Overall Troubleshooting. . . . . . . . . . . . . . . . 7–5
7–3. RF Bridge Troubleshooting . . . . . . . . . . . . . 7–6
7–4. Compensation Bridge Troubleshooting . . . . 7–6
7–5. Auto-Zero Troubleshooting. . . . . . . . . . . . . . 7–7
7–6. Chopping and Summing Circuit
Troubleshooting . . . . . . . . . . . . . . . . . 7–7
7–7. 5 kHz Multivibrator Troubleshooting . . . . . 7–7
7–8. Range Amplifier Troubleshooting . . . . . . . . 7–7
7–9. 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 TABLES
LIST OF ILLUSTRATIONS
Number Title Page
1–1. HP Model 432A Power Meter. . . . . . . . . . . . 1–0
1–2. Instrument Identification. . . . . . . . . . . . . . . 1–1
2–1. Sub-module Installation in Rack Adapter
Frame . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
2–2. HP Model 1051A Combining Case
Instrument Installation. . . . . . . . . . . 2–2
3–1. Precision Power Measurements. . . . . . . . . . 3–3
3–2. Front Panel Controls, Connectors and
Indicators . . . . . . . . . . . . . . . . . . . . . . 3–4
3–3. Rear Panel Controls and Connectors. . . . . . 3–6
3–4. Turn On and Zeroing Procedure . . . . . . . . . 3–8
4–1. Model 432A Simplified Block Diagram . . . . 4–0
4–2. Model 432A Block Diagram . . . . . . . . . . . . . 4–3
4–3. Model 432A RF Bridge Talking
Schematic . . . . . . . . . . . . . . . . . . . . . . 4–4
4–4. Model 432A Meter Logic Talking
Schematic . . . . . . . . . . . . . . . . . . . . . . 4–6
4–5. Model 432A Power Supply Talking
Schematic . . . . . . . . . . . . . . . . . . . . . . 4–8
5–1. Check and Adjustment Test Setup . . . . . . . 5–1
5–2. Zero Carryover Test Setup . . . . . . . . . . . . . . 5–3
5–3. Bridge Amplifier Test . . . . . . . . . . . . . . . . . 5–10
5–4. Transistor Biasing and Operating
Characteristics . . . . . . . . . . . . . . . . . 5–12
Number Title Page
7–1. Servicing Block Diagram . . . . . . . . . . . . . . . 7–3
7–2. Model 432A Top Internal View . . . . . . . . . . 7–4
7–3. Model 432A Waveforms . . . . . . . . . . . . . . . . 7–4
7–4. Model 432A Test Point Locations . . . . . . . . 7–5
7–5. Model 432A Bottom View, Component
Locations . . . . . . . . . . . . . . . . . . . . . . 7–6
7–6. Model 432A Front Panel Interior. . . . . . . . . 7–6
7–7. A1 Bridge Assembly, Component
Locations . . . . . . . . . . . . . . . . . . . . . 7–10
7–8. Model 432A Rear Panel Interior . . . . . . . . 7–10
7–9. 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

iv
Regulatory Information Model 432A
Declaration of Conformity
according to ISO/IEC Guide 22 and EN45014
Manufacturer’s Name: Hewlett-Packard Ltd.
Queensferry Microwave Division
South Queensferry
West Lothian, EH30 9TG
Scotland, United Kingdom
Manufacturer’s Address:
Declares that the product
Product Name: Thermistor Power Meter
Model Numbers: HP 432A
Product Options: 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

v
Model 432A Regulatory Information
Warranty
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:
1Improper or inadequate maintenance, adjustment, calibration, or operation by Buyer;
2Buyer-supplied software, hardware, interfacing or consumables;
3Unauthorized modification or misuse;
4Operation outside of the environmental and electrical specifications for the product;
5Improper site preparation and maintenance; or
6Customer 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:
1Access to the products during the specified periods of coverage to perform maintenance.
2Adequate working space around the products for servicing by Hewlett-Packard personnel.
3Access 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.)
4Routine operator maintenance and cleaning as specified in this manual.
5Consumables such as paper, disks, magnetic tapes, ribbons, inks, pens, gases, solvents, lamps,
filters, fuses, seals, etc.

vi
Regulatory Information Model 432A
Certification
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.

vii
Model 432A Regulatory Information
General Safety
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.
WARNING 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.

viii
Regulatory Information Model 432A
Safety Symbols
The following symbols on the instrument and in the manual indicate precautions which must be
taken to maintain safe operation of the instrument.
Safety Symbols
The Instruction Documentation Symbol. The product is
marked with this symbol when it is necessary for the
user to refer to the instructions in the supplied documen-
tation.
Indicates the field wiring terminal that must be
connected to earth ground before operating the
equipment - protects against electrical shock in case of
fault.
Frame or chassis ground terminal - typically connects to
the equipment's metal frame.
Alternating current (AC)
Direct current (DC)
Indicates hazardous voltages
WARNING Warning denotes a hazard. It calls attention to a proce-
dure 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 proce-
dure which, if not correctly performed or adhered to,
could result in damage to or destruction of the instru-
ment. Do not proceed beyond a caution note until the
indicated conditions are fully understood and met.
The CE mark shows that the product complies with all
relevant European Legal Directives.
ISM 1-A This is a symbol of an Industrial, Scientific, and Medical
Group 1 Class A product.
The CSA mark is a registered trademark of the Cana-
dian Standards Association, and indicates compliance to
the standards layed out by them.

ix
Model 432A Regulatory Information
Noise Declaration
LpA<70dB
am Arbeitsplatz (operator position)
normaler Betrieb (normal position)
nach DIN 45635 pt.19 (per ISO 7779)

Model 432A Section I
1-1
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 MHz to 40 GHz. 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 has provision for dc substitution
measurements and for power meter calibration. An output is
provided for recorders or digital voltmeter readout.
1–4. Accessories. 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 thermistor mount
to the meter. Thermistor mounts are available but not supplied with
the Power Meter (refer to Table 1–2). Table 1–1 lists those
accessories supplied and also those available.
1-5. INSTRUMENT IDENTIFICATION.
1–6. Hewlett-Packard instruments are identified by an 8- or 10-
digit serial number. The first four digits are the Serial Prefix. To
properly match a manual with the instrument to which it applies,
the prefix on the instrument must be the same as the prefix at the
front of the manual. If the numbers are different, information is
supplied either on yellow Manual Change Supplements, or in an
Appendix in the Manual. If the change information is missing,
contact your HP Sales Office (Sales Offices are listed at the back
of the Manual).
SER. 1234A98765
COMPANYHEWLETT - PACKARD
MADE IN U.S.A.
SERIAL PREFIX
Figure 1-2. Instrument Identification
Table 1-1. Specifications
Instrument 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% of full scale on all ranges (+0˚C to +55˚C).
Calibration Factor Control: 13-position switch
normalizes meter reading to account for thermistor
mount Calibration Factor.
Range: 100% to 88% in 1% steps.
Thermistor Mount: External temperature-compensated
thermistor mounts required for operation (see Table
1-2).
Meter: Taut-band suspension, individually computer-
calibrated, 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.
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.
RFI: Meets all conditions specified in MIL-I-6161D.
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 6-1/2 lb (3 kg).
Weight with Optional Battery Pack: Net 9-1/4 lb (4.2 kg).
Environmental:
Operating Temperature: 0 to +55˚C.
Storage Temperature: -20 to +60˚C.
Humidity: Up to 95% Relative Humidity at 40˚C.
EMC: Meets EN55011:1991 (Group 1, Class A), and
EN50082-1.

Model 432A Section I
1-3
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.
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.

Model 432A Section II
Installation
2-1
SECTION II
INSTALLATION
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 three-
prong 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
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).