HP 431-PowerMeter-1

O P E R A T I N G A N D S E R V I C E M A N U A L

MODEL

4 3 1 B

POWER M ETER

S E R I A L S P R E F I X E D : 451-

FOR OTHER S E R I A L S , S E E A P P E N D I X

C o p y r c g h l H E W L E T T - P A C K A R D C O M P A N Y

1 9 6 2

1 5 0 1 P A G E M I L L R O A D . P A L 0 A L T O . C A L I F O R N I A . U . S . A .

Printed: SEP 1965

Table of Contents Model 43 1B

Section

I GENERAL INFORMATION

1.1

1.6

1.8

1.10

.

Description

Page

. . . . . . .

. . . . . . . . . . .

1-1

.

Accessories

. . . . . . . . . .

1-2

.

Instruments with Options

. . . .

1-2

.

Instrument Identification

. . . .

1-1

1-2

11

INSTALLATION

2.1

2.3

2.5

2.9

2.12

2.15

2.17

TI1 OPERATION

3-1

3 .3

3.5

3.7

3.9

3.11

3.13

3.15

3.17

.

.

Mechanical Adjustment of

.

.

Battery Operation

.

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

3-1

Introduction

. . . . . . . . . . .

Meter Z e r o

. . . . . . . . . .

.

Controls and Indicators

Operating Instructions

Battery Charging T i m e s

. . . . .

. . . . . .

. . . . . . . .

3-1

3-1

3-1

3-1

3-1

. . . .

3-1

.

Battery Charge Check

. . . . .

3-1

.

Major Sources of E r r o r , Microwave

Power Measurements

. . . . .

3 - 1

.

Power Meter Accuracy of 1% o r

3 -2 1

3.24

.

Greater Using the DC Substitution

Method

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

3-5

Equipment Used f o r DC Substitution 3-5

.

Additional Applications

. . . . .

3-5

4.12

4.17.

4.21

4.23

.

.

Inspection

IV THEORY O F OPERATION

4.1

.

Overall Description

4.6

4.7

.

.

Circuit Description

R F Bridge Circuit

T A B L E O F C O N T E N T S

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

2-1

. . . . . . . . . . .

. . . . . . .

. . . . . . .

. . . . . . .

. . . . . . .

Metering Bridge Circuit

. . . .

Synchronous Detector

. . . . .

.

Differential Amplifier Q104/Q105

.

Feedback Current Generator Q107

2-1

.

Installation

. . . . . . . . . . .

2 -1

.

Rack Mounting

. . . . . . . . .

2 -1

.

Three-Conductor Power Cable

. .

2-2

.

P r i m a r y Power Requirements

. .

2-2

.

Initial Battery Operation Check

.

Repackaging f o r Shipment

.

. . .

2-3

2-3

Section

4.25

4-3 1

Meter Circuit 4-4

.

DC Calibration and Substitution 4-4

4.33

4.36

.

.

.

Regulated Power Supply

Power Switch

. . . . . . . .

. . . .

. . . . . . . .

Page

4-4

4-5

V MAINTENANCE

5.1

5 .4

5.6

. . . . . . . . . . .

.

Introduction

. . . . . . . . . .

5-1

.

Cover Removal and Replacement

.

5-1

.

Top Cover Removal

. . . . .

5-1

5-1

.

Top Cover Replacement

. . . .

5-1 5.7

5.8

5.9

5.10

.

Bottom Cover Removal

.

Side Cover Removal

5- 12

.

T e s t Equipment

. . . .

5-2

.

Bottom Cover Replacement

. .

5-2

. . . . .

. . . . . . . .

5-3

5-3

5.14

5.17

.

Troubleshooting

. . . . . . . .

.

The Power Supply

5-3

. . . . . .

5-3

5.21

5.27

5.32

5.34

.

10-KC Oscillator -Amplifier Check 5-4

.

10.KCAmplifierCheck

. . . .

5-7

.

Metering and Feedback Circuit

.

5-7

.

Squaring Circuit Checks

. . . .

5-7

5-40

5.42

.

Battery and Charging Checks

.

Battery Check

.

.

5-7

. . . . . . . .

5-7

5.45

5.50

5.52

5.54

5.56

5.57

5.58

5.63

5.69

5.70

5.71

5.74

5.75

.

Charging Checks

. . . . . . .

5-8

.

Battery Warranty

. . . . . . .

5-8

.

Repair

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

.

Mechanical Adjustment of

M e t e r z e r o

.

Adjustments

. . . . . . . . .

5-8

5-8

5-9

.

Power Supply Adjustments

.

.

5-9

.

Oscillator Frequency Adjustment 5-9

.

Coarse Null Adjustment

. . . .

5-9

.

Z e r o and Vernier Control

Adjustment

. . . . . . . . .

.

Full Scale Accuracy Adjustment 5-10

.

Performance Check

. . . . . .

.

Calibration and Range Tracking

5-10

5-10

.

Z e r o Carry-Over Check

. . .

5-10

Accuracy

. . . . . . . . .

5-11

VI REPLACEABLE PARTS

6.1

6.4

.

.

.

.

.

a .

6-1

.

Introduction

. . . . . . . . . .

6-1

.

Orderinginformation

. . . . . .

6-1

APPENDIX

.

. . . . . . . . . i-1

Model 431B

List of Illustrations and Tables

L l S T O F I L L U S T R A T I O N S

Number

1.1

Title

.

Mode1 431B Power Meter

Page

. . . . . . . .

1-0

2.1

2 .2

2.3

2.4

2.5

.

The Combining Case

. . . . . . . . . .

2-1

.

Steps to Place Instrument into

Combining Case

. . . . . . . . . . .

2-2

.

Adapter F r a m e Instrument Combinations

.

2-2

.

Two Half Modules in Rack Adapter

. . . .

2-3

.

Repackaging f o r Shipment

. . . . . . .

2-3

3.2

3.3

3.4

3.5

3.6

3.7

3.8

3.1

.

Front and R e a r Panel Controls and

Indicators

. . . . . . . . . . .

.

Turn-On and Nulling Procedure

. .

.

DC Substitution Technique

.

Permanent Record

.

Increased Resolution

. . . . . . .

.

Leveler Setup

. . . . . . . . . .

.

Monitor Control Systems

. . . . .

.

Determining Insertion Loss o r Gain

Number

4.1

.

Block Diagram

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

.

R F Circuit

.

Nulling Circuit

. . . . . . . . . . .

.

Synchronous Detector

.

Differential Amplifier

.

Feedback C u r r e n t Generator

.

Meter Circuit

Title

. . . . . . . . . . .

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

.

Metering Bridge Circuit

. . . . . . .

. . . . . . . . .

. . . . . . . .

. . . . .

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

.

DC Calibration and Substitution

. . . .

Page

4-0

4-1

4-2

4-2

4-3

4-3

4-3

4-4

4-4

4.10

4.11

.

Regulated Power Supply

. . . . . . . .

.

Power Switch Arrangement

. . . . . .

4-5

4-5

5.1

5.2

5 .3

5 .4

.

Cover Removal

.

.

Top View

Power Supply

. . . . . . . . . . .

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

.

Power Meter Assembly

. . . . . . . .

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

L l S T O F T A B L E S

Number

1.1

Title Page

.

Specifications

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

1-1

1.2

.

Model 431B T h e r m i s t o r Mounts

.

.

s e e

1-2

3.1

.

Voltmeter Readout to Power Multipliers

.

3-6

T e s t Equipment

Troubleshooting

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

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

5-3

Power Supply DC Voltage Checks

Power Supply Ripple Checks

. . . .

5-1

5-5

. . . . . .

5-5

10-kc Oscillator-Amplifier DC Voltage

Checks

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

5-5

10-kc Amplifier DC Voltage Checks

DC Voltages in Squaring Circuit

Check

. . .

. . . . .

5-5

Data for Calibration. Tracking Accuracy

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

5-5

5-11

6.1

6.2

.

Reference Designation Index

.

Replaceable P a r t s

6.3

.

Code L i s t of Manufacturers

. . . . . .

. . . . . . . . . . .

6-2

6-8

. . . . . . .

6-11

Section I

Figure

1-1

Model 43lB

Figure

1-1. Model

43LB Power Meter

Model 431B

Section I

P a r a g r a p h s

1-1

to 1-4

S E C T I O N

I

G E N E R A L I N F O R M A T I O N

1 - 1 .

DESCRIPTION.

1-2. The

$

Model431B Power Meter, with

@ temper- ature compensated thermistor mounts, m e a s u r e s rf power from 10 microwatts (-20 dbm) t o 10 milliwatts

(+lo dbm) in the

40-gc range.

Direct reading accuracy of the instrument is *3% of full scale. Instrument specifications a r e given in table 1- 1.

1-3. The design of the Model 431Bandits thermistor mount, results in almost complete freedom f r o m nleasurement e r r o r caused by ambient temperature changes. The instrument incorporates two self- balancing bridges with one a r m of each bridge being a thermistor. The two matched thermistors,, both located within the mount, a r e thermally coupled, but electrically isolated. One t h e r m i s t o r i s used to a b s o r b rf power; the other i s used t o provide temper- a t u r e compensation. Thus, the t h e r m a l drift problems normally associated with the thermistor-power meter arrangement have been greatly reduced.

A single setting

of

the ZERO control

on

the

most

sensitive power power range is maintained within *0.5% for all higher ranges.

1-4. The temperature compensated thermistor mounts used with the instrument a r e specifically de- signed f o r ?$ Model 4 3 1 ~ / B and waveguide thermistor mounts cover the 10-mc to

40-gc frequency range. Table 1-2 gives thermistor mount operating frequency, mount configuration, and operating resistance.

Table 1- 1. Specifications

Instrument Type:

Automatic, self-balancing for temperature com- pensated mounts

Weight:

Net 8 l b (3.63 kg) withcover and cables 11-1/2 l b

(5.44 kg) including battery; shippingapprox. 131b

(5.9 kg)

1

Power Ranges:

7 ranges with full scale readings of 10, 30, 100 and 300 pw; 1, 3 and 10 mw. Also calibrated in dbnl from -20 t o + l o .

Accessories Furnished:

5 ft (1.5 m) cable for

@ temperature-compensated thermistor mounts. 7-1/2 f t (2.3 m) power cable,

NEMA plug.

External Bolometer:

Temperature-compensated t h e r m i s t o r mounts required for operation ($ 478A and 486A s e r i e s ) .

Accessories Available:

431A-95B Rechargeable Battery Pack for field installation. Accuracy: i30/0 of full scale from +20°C to+35"C, i50/0 of full scale f r o m 0°C to +55"C

Zero Carry-Over:

Less than 0.5% of full scale when zeroed on most sensitive range

$

Models 478A and 486A T h e r m i s t o r Mounts

&,

Model 8402A Power Meter Calibrator

[email protected]

Model HOI-8401A Leveler Amplifier

Recorder1 Voltmeter Output:

Phone jack on r e a r with 1 ma maximum into 1000 ohms *lo(%; one side grounded

Calibration Input:

$

8402A Power Meter Calibrator o r precise dc standards

Power Supply:

115 o r 230 voltsi100/o, 50 to 1000 cps, 2-1!2 watts

Dimensions:

6-171 32 in.(166 m m ) high, 7-251 32 in.

(198 n ~ l n )

8

mm) deep

Options:

01. Rechargeable battery installed, provides up t o 24 hours continuous operation,

02. Rear input connector wired in parallel with front panel input connector,

10. With 20 foot cable for 100 52 o r 200

52

mount,

11. With 50 foot cable for 100

52

mount,

12. With 100 foot cable f o r 100

51

mount,

13. With 200 foot cable for 100

52 mount,

21. With 50 foot cable f o r 200 52 mount,

22. With 100 foot cable for 200

52

mount,

23. With 200 foot cable f o r 200

W

mount.

Section

I

Paragraphs 1-5 to 1-11

Table 1-2. Model 431B Thermistor Mounts

Coaxial

Type

Waveguide

Frequency

Range

Operating

Resistance in ohms

1

@

478A

10 mc to 10 gc 200

@

S486A 2.6 to 3.95 gc 100

@

G486A

3.95 to 5.85 gc 100

@J486A

5 . 3 t o 8 . 2 g c 100

Model 431B alone. In addition a jack in s e r i e s with the panel meter permits digital o r chart recording of measurements, operation of a l a r m o r control systems and use in a closed-loop leveling system.

1-6. ACCESSORIES.

1-7.

Two accessories a r e supplied with the Model

431B Power Meter: a 7-1/2-foot, detachable power cable and a 5-foot cable that connects the thermistor mount to the Mode1 431B. Thermistor mounts a r e available (see table 1-2) but not supplied with the instrument. A rechargeable battery with installation kit is also available. A list of supplied and available accessories i s given in table 1-1, Specifications.

1 - 8 . INSTRUMENTS WITH OPTIONS

1-9. The options available with the Model 431B

Power Meter a r e given in table 1-1. The thermistor mount cable options require modification and recali- bration of the Model 431B Power Meter. The recali- bration procedures for the cables a r e given in section

V, Maintenance, under Oscillator Frequency Adjust- ment (paragraph 5-58) and Coarse Null Adjustment

(paragraph 5-63).

I

*

With circular contact flange adapter

1

1-5. The Model 431B has provisions for using the dc substitution method of measurement and for check- ing calibration accuracy of the power meter. The dc substitution method of measurement which requires other equipment provides g r e a t e r power measurement accuracies than can be obtained by the power meter

1-10. INSTRUMENT IDENTIFICATION.

1-11. Hewlett-Packard uses

a

two-section eight-digit s e r i a l number (000-00000).

If the f i r s t three digits of the s e r i a l number on your instrument do not agree with those on the title page of this manual, consult the Ap- pendix for information regarding manual changes.

Yodel 431B

Section

LI

Paragraphs 2-1 to 2-8

SECTION II

2-1.

INSPECTION.

2-2. This instrument was

carefully

inspected both mechanically and electrically, before shipment. It should

be

physically free

of

perfect electrical order upon receipt. To confirm this, the instrument

should

be

inspected for phyaical damage in transit. Also check for supplied accessories,

and

test the electrical performance of the instrument

using

t&e procedure outlined in

paragraph

5-71.

If

there is

damage

or deficiency, see the warranty on

the

inside rear cover of this manual.

2-3. INSTALLATION.

2 4 .

The

@

Model

431B

fully transistorized; there- fore no special cooling

i s

required. However, the

instrument Bhould not be operated where

the

ambient temperature exceeds

55'C

(140°F).

2 - 5 . RACK MOUNTING.

2-6.

The

Model 431B

i s

a submodular unit that when used alone can

be

bench mounted

only.

when

used

in combiition with other mbmcdular

units it

can

bebench and/or

rack

m n t e d . The

@

However, combining

case axxi

this

adapter frame are designed specifically for purpose.

2-7.

COMBINING

CASE.

The combining full-module unit

which

accepts varying combinations of submodular

units.

Being

a full-module

case

unit, is a it can be bench or rack mauntedanalogousto any full-module instrument.

A n

iiluetration of

shown

in figure 2-1. Instructions for installing the

Model

431B

in

the

combining case is a combining case are given graphically in figure 2-2.

2-8.

ADAPTER FRAME.

The adapter frame

is

a rack frame that modular

units. ilbustration

af

To assemble, follows: the

It

accepts

any combination of

s u b

can be rack mounted only. adapter frame

is

An

in ifgure 2-3. refer to

Figure

2 4

and proceed

as a. Place the a c l a ~ e r

(1)

on edge of bench a s illustrated. b. Stack

the

submodular units (2)

in

the frame. c. Place

the

spacer clamps

(3)

between instruments.

d.

Place spacer clamps (4) on

the

two

end instru-

ments. e.

Push the combhation into the frame.

Figure

2-1.

The

Combining

Case

MBLY

SUBMODULE RETAINER

Model 431B

Section

I1

Paragraphs 2-9 t o 2-13

STEP a

byT(\

I

STEP

@

&

&n

SLIDE BOTTOM PART

TO L l M l T

Y

U

PUSH DOWN

STEP

@

PLACE INSTRUMENT

INTO CASE

STEP

@

PUSH I N TO L l M l T

SLIDE OVER TO L l M l T

..

.

-

Y..

SET RETAINER BACK

INTO PLACE

PUSH UP

TO

LOCK

Figure 2-2. Steps to Place Instrument into Combining Case

O

0

0

FILLER PANEL

\

I I

L

0

0

L D S U O

0

0

0

0

Figure 2-3. Adapter F r a m e Instrument Combinations f. Insert s c r e w s (5) on both sides of frame, and tighten until submodular instruments a r e secure in frame. g. The complete assembly is ready for rack mounting.

2-9. THREE-CONDUCTOR POWER CABLE.

2-10. T o protect operating personnel, the National

Electrical ManufacturersJ Association (NEMA) rec- ommends that the instrument panel and cabinet be grounded. All Hewlett-Packard instruments a r e 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 oper- ating the instrument from a two-contact outlet, u s e a three-prong

to

two-prong adapter and connect the green pigtail on the adapter to ground.

2-12. P R I M A R Y P O W E R R E Q U I R E M E N T S .

2-13. The Model 431B can be operated from an a c o r d c primary power source. The a c source can be either

115 o r 230 volts, 50 to 1000 cps. The d c source i s a

24-volt rechargeable battery. The rechargeable battery is supplied with option 01 instruments only.

Model 431B

2-14. For operation from a c primary power, the instrument can be easily converted from 115- to 230- volt operation. The LINE VOLTAGE switch, S1 a two-position slide switch located a t the r e a r of the instrument, selects the mode of a c operation. The line voltage for which the instrument is s e t to operate appears on the slider of the switch. A 15/100-ampere, slow-blow fuse i s used for both 115- and 230- volt operation.

CAUTION

DO NOT CHANGE THE SETTING O F THE

LINE VOLTAGE SWITCH WHEN THE POWER

METER IS OPERATING.

2-15. INITIAL BATTERY OPERATION CHECK.

2-16. The following applies to option 01 instruments o r instruments that have field-installed batteries.

When the battery is used a s the Model 431B power source for the f i r s t time, perform the following steps: a. Connect Model 431B to a c source. Set POWER switch to CHARGE and charge battery for a minimum of 16 hours o r overnight. Note: the battery can be maintained in the charging state indefinitely without damaging the battery. It will a s s u m e i t s full capacity,

1.25 ampere hour, and no more. b. P e r f o r m turn-on procedure given in figure 3-2 with POWER a t AC. If the procedure checks out normally, proceed to step c.

Section I1

Paragraphs 2-14 t o 2-18 c. Repeat turn-on procedure given in figure 3-2 with POWER a t BATTERY ON. If operationis not the s a m e a s that obtained with a c power applied, r e f e r to paragr::

'.

5-40, Battery and Charging Checks.

2-17. REPACKAGING FOR SHIPMENT.

2-18. The Model 431B i s shipped in a foam-pack and cardboard carton (see figure 2-5). When repackaging the instrument for shipment, the original foam-pack and cardboard carton can be used if available. If not available, they can be purchased from Hewlett-Packard

Co. (refer to section VI, misc). Use the following a s a general guide for repackaging the instrument. a. P l a c e the instrument in the foam-pack a s shown in figure 2-5. b. Mark the packing box with "Fragile", "Delicate

Instrument.

"

Note

If the instrument is to be shipped toHewlett-

Packard f o r service o r repair, attach to the instrument a tag identifying the owner and indicating the s e r v i c e o r r e p a i r t o be accom- plished, include the model number, and full s e r i a l number, of the instrument. In any correspondence, identify the instrument by model number, s e r i a l number and s e r i a l number prefix.

0

aDAPTER

FRAME

Figure 2-4. Two Half Modules i n Rack Adapter

01370-3

Figure 2-5. Repackaging for Shipment

2-3/2-4

Model 431B

Section I11

Paragraphs 3-1 to 3-16

S E C T I O N Ill

O P E R A T I O N

3-1.

INTRODUCTION.

3-2. The

@

Model 431B Power Meter m e a s u r e s rf power ranging from .O1 t o 10 milliwatts with power meter accuracy of *3%. The z e r o c a r r i e s over from range to range within +0.5% of fullscale whenthe me- t e r i s zeroed on the most sensitive scale.

3-3.

MECHANICAL ADJUSTMENT OF

METER ZERO.

3-4.

The procedure for performing the mechanical adjustment of the meter zero is given in section V, paragraph 5-54.

3 - 5 .

CONTROLS A N D INDICATORS.

3-6.

The front and r e a r panel controls and connectors a r e explained in figure 3-1. T h e explanations a r e keyed to corresponding controls and indicator on the drawing of the front and r e a r panels of the instrument provided with the figure.

3 - 7 .

OPERATING I N S T R U C T I O N S .

3-8. Figure 3-2, Turn-On and Nulling Procedure, and figure 3-3, DC Substitution Technique, give step- by-step instructions for operating the Mode1 431B. In figure 3-2, each step is numbered to correspond with numbers on the accompanying drawing of the power meter.

3-9.

BATTERY OPERATION.

3-10. The following applies t o power m e t e r s having a factory o r a field-installed rechargeable nickel-cad- mium battery. See figure 3-1, Turn-On and Nulling

Procedure, f o r step-by-step instructions for operating the Model 431B f r o m a battery.

3-11. BATTERY CHARGING TIMES.

3-12. The battery used in the Model 431B r e q u i r e s two hours of charge time for one hour of battery operation. When the battery is fully charged, the

Model 431B can be continuously operated f o r 24 hours with 48 hours of charge time. However, i t i s recom- mended that battery operated instruments be operated for eight hour periods with a 16 hour recharge time.

This makes the

Model 431B available for portable use daily, yet maintains the battery a t full charge.

3-13. BATTERY CHARGE CHECK.

3-14. Under normal conditions, a fully charged battery will s t a r t a t approximately 27 volts and drop to about 22 volts after 24 hours of continuous use a t room temperature. a. Connect the Model 431B to a c primary power.

Set POWER to AC and perform the turn-on and nulling procedure given in figure 3-2. T h i s will check for normal operation from a c p r i m a r y power. If perform- ance is normal proceed to step b. b. Set POWER t o BATTERY CHARGE: the AC

CHARGE lamp will glow. Allow Model431B to charge the battery for 48 hours. This will allow the battery t o obtain a full charge. c. After the recharge interval, s e t POWER to

BATTERY ON. Since battery i s now fully charged. you should be able to z e r o i s e t and null-the meter

(figure 3-2). If not the battery o r battery charging circuit is a t fault. Refer t o Battery and Charging

Checks paragraph 5-40.

3-15.

MAJOR SOURCES OF ERROR, MICROWAVE

POWER MEASUREMENTS.

3-16. In microwave power measurements, the follow- ing a r e the major s o u r c e s of e r r o r : 1) mismatch e r r o r o r tuner l o s s (when a tuner is used to tune out mismatch e r r o r ) , 2) bolometer mount efficiency, 3) substitution e r r o r , 4) instrument e r r o r and 5) e r r o r due to the unilateral properties of a thermistor. Thus five e r r o r s must be known if accurate power measurements a r e to be obtained. Expressed mathematically:

Total measurement e r r o r = mismatch ( o r tuner) l o s s instrument e r r o r

+ calibration factor

+

+ e r r o r due to the unilateral properties of a thermistor a. Mismatch Loss. Unless the mount and rf s o u r c e a r e perfectly matched to the transmission system,

a

fraction of incident power is reflected and does not reach the thermistor. Since t h e r e generally i s m o r e than one source of mismatch in a microwave meas- urement system and the resulting e r r o r signals inter- act, l o s s cannot be calculated f r o m the s w r figure, i t can only be expressed a s lying between two limits.

Limits of mismatch l o s s generally a r e determined by means of a chart such a s the Mismatch Loss Limits chart included in each of the thermistor mount

Operating Notes. A tuner such a s the

@

Model 872A o r 870A can be used to minimize loss, although the tuner itself will introduce some loss. b. Bolometer Mount Efficiency and Substitution

E r r o r . Not a l l the rf power applied to the mount is used to heat the rf thermistor. someof

it

is absorbed by the other elements i n the mount, such a s the walls of the rf chamber, the heat sinks, the leads, etc. Sub- stitution e r r o r r e s u l t s because rf power does not affect the thermistor t o the same degree a s dc power. Sub- stitution e r r o r and mount efficiency a r e often combined forsimplicity of measurement into what is termed

"calibration factor". Typically, the calibration factor of the Model X486A waveguide mount is 97% to 98%.

Section

III

Figure 3-1

Model 431B

I.

POWER: The POWER switch s e t s up connections to the selected power s o u r c e s o r t o the battery charging circuit. When the power switch is in the AC position, externally supplied 115 o r 230 volts is applied t o the instrument. If the instru- ment contains a battery, a trickle charge is applied to maintain the battery a t full charge.

With POWER a t BATTERY ON,

a

24-vdc battery within the instrument supplies primary power to the instrument. With POWER a t CHARGE,

115- and 230-volt power is used to charge the battery (16 t o 24 hours is required to obtain full battery charge). The instrument is in- operative in this position. Note: Batteries a r e installed a t the factory f o r option01 instru- ments only.

2. RANGE: The RANGE switch can be s e t for full scale power readings from

.O1 to 10 milliwatts in seven steps. I t also includes a NULL posi- tion which, in conjunction with the adjacent null screwdriver adjust, i n s u r e s that the meter- ing bridge is reactively balanced.

3.

THERMISTOR MOUNT: The THERMISTOR

MOUNT connector is a female receptacle that accepts a specially-made cable whichis supplied with the instrument. The cable connects the mount thermistors into their respective bridges within the power meter.

4. MOUNT m S : This two -position slide switch s e t s the power meter to accommodate therm- istor mounts of 100- o r 2 0 0 - o h m n o m i n a l resistance.

5. Z E R O and V E R N I E R : The Z E R O c o n t r o l coarsely s e t s the meter pointer near zero; the

VERNIER control is

a

more exact adjustment which s e t s the meter pointer on zero.

6.

Ln

Option 02 instruments only, mount connector wired in parallel with front

- panel connector.

Two mounts cannot be connected simultaneously.

7. RECORDER: The RECORDER input i s

a

grounded telephone jack f o r monitoring the current which operates the Model 431B meter.

8. D C CALIBRATION & SUBSTITUTION: T h i s terminal permits application of known direct current to the rf bridge. The power reading obtained with the accurately known dc power applied i s then compared with the reading ob- tained when rf power was applied. The dc sub- stitution technique is used both to calibrate the

431B and to increase the accuracy of p o w e r measurement.

9. LINE VOLTAGE: The

LINE

VOLTAGE switch,

S1, is a two-position slide switch that selects the mode of ac operation. The line voltage for which

the

instrument is

set

to operate appears on the slider of the switch. A 15/100 slow-blow fuse is used for both 115 and 230volt operation.

Figure 3-1. Front and Rear Panel Controls and Indicators

Model 431B

Section III

Figure 3-2

I I

OFF

POWER

A C a.TTrml(

THERMISTOR

MOUNT

4318 POWER M E T E R

I I

1"

.ox .m

.1

.s

I

3

60

Imn

loon

LO-M-604

m-

1.

Connect thermistor mount and cable to the

THERMISTOR MOUNT.

($0 thermistor mounts and their frequency ranges a r e given in table

1-2, Model 431B Thermistor Mounts.

Note

When possible, the Model 431B should be zeroed and nulled with the power source to be measured connected t o the thermistor mount. If this is not possible, and a coaxial thermistor mount is used, terminate the rf input into a 50-ohm load. Power source should be off while zero and null-setting the Model 43133 Power Meter.

2. Set MOUNT RES to match thermistor mount resistance (100 o r 200 ohms).

3. Set RANGE to . O 1 MW.

4,

Set POWER to AC; AC & CHARGE lamp will glow. If instrument i s battery-operated, rotate

POWER to

5.

Adjust ZERO control for 25 to 75% of full scale on meter.

6.

Rotate

RANGE to

NULL and adjust null screw- driver adjust (adjacent to

NULL

switch) for a minimum reading. on RANGE

7. Repeat steps 5 and

6 until NULL reading i s within

NULL

region on the meter.

Note

If instrument i s battery-operated and you a r e not able t o zero the meter, o r if meter pointer fluctuates rapidly, battery needs recharging. Refer to paragraph 3-11.

8. Set RANGE switch to the power range to be used and zero-set the meter with ZERO andVERNIER controls.

Note

Zero-set accuracy of 0.5'hof full scale can be obtained by zero setting the meter on the most sensitive range

(.

01 mw) only, and assumingthe meter i s properly zeroed on all l e s s sensitive ranges. For maximum accuracy, zero s e t the meter on the range to be used.

9.

Apply rf power a t the thermistor mount and read power on Model 431B meter. Power i s indicated on the meter directly in mw o r dbm.

Note

This instrument is accurate to withini3%.

Accuracy to *I%, o r better, is possible using the dc substitution technique de- scribed in figure 3-3. See alsoparagraphs

3-15 and 3-17.

-

Figure 3-2. Turn-On and Nulling Procedure

Section I11

Figure 3-3

I

POWER SUPPLY

0-300vdc

\

DIGITAL VOLTMETER

,r

2cy:

0.2%

",.Po

35BR/CR

1 r[

IK, .05%. I W

IOK. IOO/o. IOW

@MODEL

4318

POWER METER

n

LO.".$,.

Model 431B

1. With power supply turned off, connect the

Model 431B a s shown above.

2. Set the Model 431B for normal operation on the appropriate range using the procedure given in figure 3-2.

3. Apply rf power a t the thermistor mount and note and record the reading of the Model 431B meter. This i s the reference for the substi- tution measurement.

Note

A second digital voltmeter,

in

parallel with a 1000-ohm (*lo%,

1 watt) resistor, connected in s e r i e s with the RECORDER output of the Model 431B will increase accuracy of reference duplication.

4. Turn off, o r disconnect, the rf source.

CAUTION

Never apply more than 20 ma dc to the DC

CALIBRATION & SUBSTITUTION termi- nals of the Model 431B.

6. Read the voltmeter which monitors the substitu- tion current. The voltmeter reading can be interpreted a s current in milliamperes because the voltage is measured across 1000 ohms.

This current is Id,.

7. Calculate power in mw from the expression

Power (MW) =

"dc

Rd

4 x 10

3 where Rd

= operating resistance of the term- istor (100 o r 200 ohms)

5. Turn power supply on; adjust the output voltage of the power supply until the reference of step 3 is duplicated. A potentiometer arrangement may be substituted for the adjustable power supply. However, at least 10,000 ohms must remain in s e r i e s with the supply. and Idc = substitution current in milliamps

(from step 6)

9.

T o minimize e r r o r due to drift in either the reference o r substituted power level, steps 1 through 6 should be repeated.

-

-

Figure 3-3. DC Substitution Technique

01370- 2

c. Instrument E r r o r . This is the inability of the power meter t o accurately measure and interpret the information available a t the thermistor element. In specifying the accuracy of a power meter, instrument e r r o r is the figure usually given. F o r the Model 431B, instrument e r r o r is lt3% of full scale, 20°C to 35°C.

This e r r o r can be reduced by special techniques such a s the dc substitution method discussed in para. 3-17. d. E r r o r Due to the Unilateral Properties of a

herc cis tor.

The thermistor used in conjunction with when the source of power

is

a d c current, causes a slightly different indication of power than is obtained by the calculation of

Meter is not the s a m e a s the rf power required to

Meter. The maximum e r r o r produced from this source of e r r o r is 10.3 pwatts, typical e r r o r is lt0.1 pwatt.

Since the order of magnitude of this e r r o r is small

(0.3 pwatt) i t need be minimized

pnly

on the two most sensitive ranges of the Model 431A/B Power Meter.

Refer to the

@

Model 8402A Power Meter Calibrator manual for procedure used to minimize this e r r o r .

3-17. POWER METER ACCURACY OF 1% OR

GREATER USING THE DC SUBSTITUTION

METHOD.

3-18. Highly accurate instruments a r e available for measuring direct current. Thus, where optimum accuracy is required, there is considerable advantage in using a technique where the

rf

measurement is used only a s a reference and the determination of rf power is based on precise dc measurements. In general the technique involves: a. Applying rf power t o the Model 431B inthe usual manner, and noting the resulting meter indication for use a s a reference. b. Removing the rf power and applying sufficient dc a t the DC CALIBRATION & SUBSTITUTION terminals to exactly duplicate the meter indication produced by the rf power. c. Using the value of dc which duplicated the ref- erence in calculating rf power.

3-19. Although the dc substitution technique

is

the most accurate method of measuring rf power, there a r e sources of e r r o r that must be considered. The accuracy of the dc substitution technique depends largely upon: a. how precisely the reference is duplicated,

Section III

Paragraphs 3-17 to 3-26 b. how accurately the value of the substituted d c is known,

c.

the actual operating resistance of the thermistor, and d. the actual ratio of current division in the rf bridge.

3-20. With precision components in the substitution setup and careful procedure, e r r o r produced by the

Model 431B Power Meter canbe reducedto

This is assuming nominal thermistor mount resistance

(100 o r 200 ohms) and that half the applied dc flows through the rf thermistor. The d c substitution tech- nique using the Model 431B is shown in figure 3-3.

3-21. EQUIPMENT USED FOR DC SUBSTITUTION.

@

Model 8402A Power Meter Calibrator was specifically designed to be used for calibration and dc substitution measurements of rf power. In addition, the instrument will accurately measure the operating resistance of the thermistor mount being used. Use the procedures given in the manual provided with the

@

Model 8402A Power Meter Calibrator to perform the d c substitution measurements.

3- 23. Although the most convenient and accurate means of applying the dc substitution technique is by using

@

Model 8402A Power Meter Calibrator, it is also possible to accurately measure power using the dc substitution technique with the arrangement shown in figure 3-3. The digital voltmeter is used to monitor the substitution current. The power supply output and voltmeter input a r e ungrounded to eliminate ground currents.

3-24. ADDITIONAL APPLICATIONS.

3-25. At the RECORDER output, the Model 431B fur- nishes a current (0 t o l ma dc) which is proportional to the power measured. This feature makes possible a measurement system with more capability than simply the indication of power on a meter. Some of the more sophisticated measurement systems a r e shown in block diagram form in figures 3-4 through 3-8.

3-26. PERMANENT RECORD. Use of a recorder in the measurement system is indicated in figure 3 -4.

Resistance a c r o s s the Model 431B RECORDER output should be 1000 ohms 110% f o r optimum measurement accuracy. Any type of recorder may be used with the

Mode1 431B; if input resistance exceeds 1000 ohms, use a shunt a c r o s s the recorder input.

RF SOURCE

-

(

TEMPERATURE

COMPENSATED

THERMISTOR

MOUNT

@

478A. 486A)

4

9

MODEL

4318

POWER

METER

J

IOZ

R E C O R D E R

looon

INPUT

.

RECORDER

Figure 3-4. Making a Permanent Record

Section

111

Paragraphs 3-27 to 3-30

Model 431B

*

RF SOURCE

--o

TEMPERATURE

COW PENSATED

THERMISTOR

MOUNT

(

,@

4 7 8 A , 4 8 6 A )

--c

I;p

MODEL 4318

POWER

METER

Figure 3-5. Obtaining Increased Resolution

3-27. INCREASED RESOLUTION. Digital readout of power to three decimal places can be obtained with the arrangement shown in figure 3-5. The value of R1 is

316.2 ohms

*.

1% and is 1000 ohms

~ 1 % . placement of the decimal in the readout isdetermined by the setting of the power meter RANGE switch. On the divider-switch arrangement a t the voltmeter input may be replaced by a single 1000-ohm .l%

With this arrangement, on the .01, .I, and 10 MW ranges, power is read in the same way a s when the arrangement shown in figure 3-5 is used, decimal placement being determined by the setting of RANGE. o n the .03, .3,- and 3

MW ranges, however to obtain the power readings the voltmeter indication must

be

multiplied by the factor given in table 3-1.

Table 3-1. Voltmeter Readout to Power Multipliers

Multiplier

.03 MW

3-28. LEVELER. Figure 3-6 is a block diagram of a closed-loop control circuit for maintaining output power at a constant level. It is recommended for use in leveling the output of various types of

@ microwave equipment such a s bwo sweep oscillators, twt micro- wave amplifiers, and rf generators. In addition to the

Model 431B and i t s thermistor mount, such a leveling system requires the

@

H01-8401A Leveler Amplifier and a directional coupler with good directivity suchas one of the

@

752 s e r i e s of waveguide couplers o r 770 s e r i e s of coaxial couplers. The output of the power source is sampled by the coupler and applied to the

Model 431B. A dc signal, proportional to the power sample, is fed (from the Model 431B RECORDER jack) to the Leveler Amplifier. In the H01-8401A the signal from the Model 431B is compared to an internal ref- erence voltage, and the difference is amplified and fed

3-29. MONITOR dc amplifier and relay

SYmEMS. BY adding a

circuit

to the rf monitoring arm of a system, the dc signal provided by the Model 431B can be used to actuate alarm o r control circuits. Ar- rangement of equipment to provide an alarm o r control system is shown in block diagram form in figure 3-7.

3-30. DETERMINING INSERTION LOSS OR GAIN AS

A FUNCTION OF FREQUENCY. Arrangement of a system to obtain information on insertion loss o r gain a s a function of frequency is indicated in figure 3-8.

Initially, the device under t e s t is not connected into the system; connect the thermistor mount directly to the sweep oscillator. Set the sweep oscillator for the band of interest, and record variations in amplitude a s frequency is swept; this curve is the reference. Next, insert the device under t e s t between the sweep oscillator and the thermistor mount, and again record frequency response. The difference between the second reading and the reference, at any one frequency, is the insertion loss o r gain of the device a t that frequency.

TEMPERATURE

-

THERMISTOR

WOUWT

@

4 7 8 A . 4 8 6 A

-

RECORDER

-

INPUT

-

@ H O I - 8 4 0 1 ~

LEVELER

AMPLIFIER

AMPLITUDE

MODULATION

INPUT

SOURCE

1

Dl RECTIONAL

-

CONTROL VOLTAGE (NEGATIVE FEEDBACK)

I

Figure 3-6. Leveler Setup

Model Section III

F i g u r e s

3-7

and

3-8

TEMPERATURE

-

THERMISTOR

MOUNT

@ o 7 8 ~ . 4 8 6 ~

?

t

.

-

'9

MODEL 4318

METER

J102

RECORDER looon

.

DC

AMPLIFIER

=

ALARM.

CONTROL,

7

CORRECTIVE

D E V I C E S

L

B D - 5 - 255

F i g u r e

3-7. Monitoring Control S y s t e m s

Rf

SWEEP

OSClLLATOR

R f

-

-

MICROWAVE

OEVICE

SWEEP

OUTPUT

3

TEMPERATURE

COMPENSATED

THERMISTDR

M

UNT

9

&A, 4 8 6 A

$,MODEL 4310

RECORDER

J l 0 2

M E T E R

-

-

F i g u r e

3-8.

Determining Insertion

Loss

o r Gain

Y

INPUT

X-Y RECORDER

~ O O O A ~

7

1

X

NPUT

*

8 0 - 5 - 2 5 6

Model

43 1B

Section

N

Figure 4-1

'

7-----

DC C A L I B R A T I O ~

8 SUBSTITUTION

L - - - - - d

'

5 1 0 3

>

1

-

T b

-

-

I

IOKC

- -

IOKC

I

OSCILLATOR

AMPLIFIER

9108-

0111

LEGEND

-

I

I

IOKC

DC

1

M

IOKC STNCHROWOUS

4107

-

-1

1 1 5/23OVAC

50-IOOO-

- 2 4 V D C

OPTIONAL BATTERY

_

/

REcuLATED

POWER

SUPPLY t I . 5 V D C

.

-

I8VDC (REG)

- 2 5 V D C (REG)

:

Figure

4-1. Block

Diagram

DIffERENTIAL

AYPLIF IER

.

OlO4/0105

FEEDBACK-

CURREWT-

SQUARED

GENERATOR

0106

-.

I

r-.

.-

1 MlOl

I

I.R-E*!E!;

I

Iu

.D.L.,i.B

Model 431B Section

IV

Paragraphs 4-1 to 4-11

S E C T I O N I V

T H E O R Y O F O P E R A T I O N

4-1. O V E R A L L D E S C R I P T I O N .

4-2.

Figure 4-1 i s a block diagram which shows the

Model 431B Power Meter and its associated thermistor mount. The thermistor mount contains two thermistor elements (Rd and Rc). Thermistor element Rd absorbs the rf power applied to the mount; thermistor element

Rc converts the applied rf power to a meter indication and provides compensation for ambient temperature changes at the thermistor mount.

4-3. The power meter circuitry incorporates two bridges which a r e made self-balancing by means of separate feedback loops. Regenerative (positive) feed- back i s used in the detection loop; degenerative feed- back in the metering loop. One thermistor element i s used in one a r m of each of the self-balancing bridges.

In the detection loop, the 10 kc oscillator-amplifier supplies enough 10 kc power (Il0 kc) to bias thermistor element Rd to the operating resistance whichbalances the rf bridge. The same amount of 10 kc power i s also supplied to thermistor element Rc by the series-con- nected primaries of transformers TlOl and T102.

4-4.

When rf power i s applied to thermistor element

Rd, an amount of 10 kc power equal to the rf power is removed from thermistor element Rd by the self- balancing action of the rf bridge. Since the primaries of TlOl and TI02 a r e series-connected, the same amount of 10 kc power is also removed from thermistor element Rc, thus, the action which balances the rf bridge unbalances the metering bridge. The metering bridge loop automatically re-balances by substituting dc power for 10 kc power. Since the 10 kc power equaled the applied rf power, the substituted dcpower i s also equal to the applied rf power. Instead of metering the feedback current directly, which would require the use of a nonlinear meter scale, an analog current i s derived which i s proportional to the square of the feedback. Since power is a square-law function of current, the analog current thus derived is pro- portional to rf power, making possible the use of a linear scale on the meter.

4-5. There i s little drift of the power meter zero point when ambient temperature at the thermistor mount changes. If, for example, ambient temperature at the mount increases, a decrease in electrical power to the thermistors i s required to hold their operating resistances constant. The decrease, for both therm- istors, i s made automatically by the detection loop

(figure 4-1) which reduces 10 kc power. The amount of dc power in the metering loop remains unchanged however, and since this dc power controls the meter action, the a rn b i e n t temperature changes d o n o t affect the meter indication. The compensation capa- bility depends upon the match of thermistor tempera- ture characteristics. When thermistor mounts a r e built, the thermistors a r e selected to insure optimum match of thermal characteristics.

-1

4-6. C I R C U I T D E S C R I P T I O N .

4-7. R F BRIDGE CIRCUIT.

4-8. A simplified schematic diagram of the rf bridge circuit is shown in figure 4-2. The rf bridge circuit consists of the rf bridge and 10-kc oscillator-amplifier.

The rf bridge includes thermistor Rd, the secondary winding of T101, r e s i s t o r s R102 andR103, theMOUNT

RES switch, S101, and capacitance represented by Ca and Cb. The rf bridge and 10 kc oscillator-amplifier a r e connected in a closed loop (the detection loop) which provides regenerative feedback for the oscillator- amplifier. This feedback causes the 10 kc oscillator- amplifier to oscillate.

4-9. When the power meter i s off, thermistor Rd i s at ambient temperature and i t s resistance is about 1500 ohms; the rf bridge i s unbalanced. When the power meter is turned on this unbalance of the rf bridge causes a large e r r o r signal to be applied to the 10 kc oscillator-amplifier. Consequently maximum 10 kc bias voltage is applied to the rf bridge. As this 10 kc voltage biases Rd to i t s operating resistance (100 o r

200 ohms) the rf bridge approaches a state of balance and regenerative feedback diminishes until there is just sufficient 10 kc bias power to holdRd at operating re- sistance. This condition i s equilibrium for the detection loop.

4-10. With application of rf power, thermistor Rdls resistance decreases causing the regenerative signal from the rf bridge to decrease. Accordingly, 10 kc power diminishes, the thermistor returns to operating resistance and the detection loop regains equilibrium.

4-11. The MOUNT RES switch, S101, changes the resistance a r m of the rf bridge s o thatthe bridge will function with either a 100 o r 200 ohm thermistor mount.

IOKC

B I A S

TlOl v d:tk~~

AMPLIFIER

4;Ef:

TO

METERING BRIDGE

Figure 4-2. R F Circuit

FROM

RF

N U L L

- lOKC BlAS

TI02

COMPENSATION

THERMISTOR

I

SHIELD

rrm

IOKC

ERROR

SIGNAL

lotic

AHPLl

F l

ER

Model 431B

Section IV

Paragraphs 4-12 to 4-19

4- 12. METERING BRIDGE CIRCUIT.

4-13.

A simplified schematic diagram of the metering bridge circuit is shown in figure 4-3. Operationof the metering bridge circuit is similar to the rf bridge cir- cuit. It uses the same principle of self-balancing through a closed loop (metering loop). The major dif- ference i s that dc rather than 10-kc power i s used to rebalance the loop. The resistive balance point i s adjusted by the ZERO and VERNIER controls which constitute one a r m of the bridge. The MOUNT RES switch (not shown in figure 4-3) which i s mechanically linked to both the rf bridge and metering bridge, changes metering bridge reference resistance from

100 to 200 ohms. When the MOUNT RES switch is in the ZOO-ohm position some of the feedback current i s shunted to ground through R101. This maintains the from 100 o r 200 ohms. The switch also adds the necessary reactance for each position.

4-14. The same 10 kc power change produced in the rf bridge by rf power also affects the metering bridge through the s e r i e s connection of TlOl and TI02 pri- maries. Although this change of 10-kcpower has equal effect on both the rf and metering bridges, it is initiated by the rf bridge circuit alone. The metering bridge cannot control 10-kc bias power, but the 10-kc bias power does affect the metering circuit. Once a change in the 10-kc bias power has affected (unbalanced) the metering bridge, a separate, closed dc feedback loop

(metering loop) re-establishes equilibrium in the metering circuit.

4-15. Variations in 10-kc bias level, initiated in the rf bridge circuit, cause proportional unbalance of the metering bridge, and there i s a change in the 10-kc error signal (S10 kc) applied to the 10-kc tuned ampli- fiers in the metering loop. These e r r o r signal vari- ations a r e amplified by three 10-kc amplifiers, and rectified by the synchronous detector. From the synchronous detector the dc equivalent (Idc) of the

10-kc signal is returned to the metering bridge, and is monitored by the metering circuit to be indicated by the meter. This dc feedback to the metering bridge acts to return bridge to i t s normal, near-balance condition.

F R O M

RF

BRIDGE

4

I0 K C

B IAS

f

RF

S H I E L D

M E T E R I N G

BRIDGE

IOKC ERROR

I

I

I li_

IOkC

TUNED s

SIGNAL

l ~ ~

ioKc

SYNCHRONOUS

7

DETECTOR

AMPLIFIERS

P101,102A103

~

/ - loKC

DC

AUPLIFIER

0104/105

F -

DC DC BIAS

CIRCUIT

PI07

I

- t

1

Figure 4-4. Nulling Circuit

4-16. The reactive components of the meteringbridge a r e balanced with variable capacitor C103 and inductor

L102. Null adjust, C103, i s an operational adjustment and L102 i s a maintenance adjustment. Null adjust

C103, i s adjusted with the RANGE switch inthe

NULL

position. A simplified schematic diagram of the

NULL

circuit i s shown in figure 4-4. The 10 kc signal is taken a t the synchronous detector, rectified by CR105, and read on the meter. The rectified signal contains both reactive and resistive voltage components of the bridge unbalance.

4- 17. SYNCHRONOUS DETECTOR.

4-18. The synchronous detector converts the 10-kc e r r o r signal from the metering bridge to a varying dc signal. A simplified schematic of the synchronous detector i s shown in figure 4-5. The detector

is

a bridge rectifier which has a rectifier in series with a linearizing resistance in each of i t s arms. Two 10-kc voltages, designated E3 and E4 in figure 4-5, a r e applied to the bridge; 1) voltage E3, induced in the secondary of transformer T103, i s proportional to the metering-bridge e r r o r signal and is incoming from

10-kc tuned amplifier Q103; 2) voltage E4, induced in the secondary of T104, i s proportional to a voltage supplied by the 10-kc oscillator-amplifier. Voltage

E4 i s much larger than voltage E3 and switches appro- priate diodes in and out of the circuit to rectify voltage

E3. Section (a) of figure 4-5 shows the current path through diodes CR102 and CR104 for a positive-going signal; section (b) shows the current path through diodes

CRlOl and CR103 for a negative-going signal. The rectified output is taken at the center taps of trans- formers T103 and T104.

4-19. Operation of the circuit i s a s follows: When the left side of TI04 is positive with respect to the right side a s in figure 4-5a, diodes CR102 and CR104 con- duct while diodes CRlOl and CR103 a r e biased off.

With the polarities reversed, a s in figure 4-5b, the Figure 4-3. Metering Bridge Circuit

Model 431B

Section IV

Paragraphs 4-20 to 4-24 lOKC

FROM

SYNCHRONOUS

FROM IOKC

TUNED

-+

AMPLIFIER,

OIC13

T I 0 3

SYNCHRONOUS

DETECTOR

*

*

I 0 KC-

F R O M

O S C I L L A T O R

/

A M P L I F I E R

i

T I 0 4

;

-

- *

- -

*

- -

*

-

RECTIFIED

IOKC

OUTPUT

-

--',+

- -

+

-

-*

AMPLIFIER.

0103

T 103

Figure 4-5. Synchronous Detector

t

I O K C -

F R O M

O S C I L L A T O R /

A M P L I F I E R

SYNCHRONOUS

I

A

*

I i i

i

T 4

4

-

DETECTOR

C R 1 0 2

'*

- -

I

*

I

+

--

+:

+

+

I

- - *

+

I03

C R 1 0 4

.-

OUTPUT

S D - S - 1 7 9

- diodes CR102 and CR104 a r e biased off. The resultant output is a pulsating dc signal equivalent to the applied

10-kc e r r o r signal. T h i s pulsating dc signal is filtered and applied to differential amplifier Q104/Q105.

TO FEEDBACK-

FROM

CURRENT-SQUARED

GENERATOR

DC BIAS TO

-*

1

BRIDGE

)

F E E D B A Z O L J R R E N T G E N E R A T O R

COLLECTOR

O F O l O 4

9

4-20. P r o p e r synchronous detector output requires an in phase relationship between E3 and E4 and for ampli- tude of E4 to be l a r g e r than that of E3.

4-21. DIFFERENTIAL AMPLIFIER Q104/Q105.

4-22. A simplified schematic diagram of the amplifier is shown in figure 4-6. The pulsating dc from the synchronous detector is filtered by C117, C118, C119,

-25V

OUTPUT

,

TO:

(

1 10106

"I

0107

9

,C117

1 bIl8

I

-

18V

Figure 4-7. Feedback Current Generator and R140, amplified by Q104 and fed to both the feed- back current-squared generator, Q106 (figure 4-7) and feedback current generator Q107. Temperature com- pensation and low emitter circuit resistance for Q107 a r e provided by Q105. Diode CR106 protectsQ106 and

Q107 from excessive r e v e r s e bias when Q104 is cut off.

IFFERENTIAL

QIo5

AMPLIFIER

T

4-23. FEEDBACK CURRENT GENERATOR Q107.

4- 24. A simplified schematic diagram of the feedback current generator is shown in figure 4-7. The dc signal from the differential amplifier is applied to feedback current generator Q107. Q107 has two functions: 1) i t

Figure 4-6. Differential Amplifier

Section IV

Paragraphs 4-25 to 4-35

M E T E R

FEEDBACK-

CURRENT-

A M P L I F I E R

1 I l t l l

I O K C B I A S -

Model 431B

R

F

BRIDGE

TO METERING

B R I D G E

- -

,n.,

-

Figure 4-8. Meter Circuit completes the metering loop to the metering bridge, and 2) i t operates in conjunction with the first

10-kc amplifier, Q101, and the RANGE switch to change metering loop gain s o that the meter will read full scale for each power range. Diode CR107 provides additional temperature compensation for Q107.

4-25. METER CIRCUIT.

4-26. The meter circuit is shown in figure 4-8. It includes feedback current-squared generator Q106, a squaring circuit, the meter, and RECORDER jack,

5102. The purpose of the meter circuit is to convert a linear voltage function, proportional t o applied power, to a squared function s o that power may be indicated on a linear m e t e r scale. T h e linear voltage function is applied t o the b a s e of Q106 and is converted

to

a square law function by the squaring circuit in

series

with $106 emitter.

4-27. SQUARING CIRCUIT. The squaring circuit in- cludes diodes CR109-113, and r e s i s t o r s R167-177.

Temperature compensation f o r the squaring circuit is provided by CR108.

4-28. The design of the squaring circuit is such that individual diodes conduct a t d i s c r e t e values of emitter voltage s o that emitter conductance approximates a square law function. Thus the collector current of

Q106 is made to approximate

a

square law function, and the meter indicates power on a linear scale.

4-29. RECORDER OUTPUT. The current whichdrives the meter can be monitored a t the RECORDERoutput, a telephone-type two-wire jack. A RESISTOR

O F

1000 OHMS MUST REMAIN IN SERIES WITH THE

METER

FOR

ALL APPLICATIONS USING THE

METER-DRIVING CURRENT.

4-30.

ZEROING.

Perfect balance of the metering bridge would mean that no 10 k c e r r o r signal would be applied t o tlie 10 kc amplifiers, there would be no dc feedback from Q107, and the metering loop would be open. With an open metering loop, z e r o reference could not be accurately established. In the Model

ERROR

S I G N A L

S o - s - 1 7 6

Figure 4-9, DC Calibration and Substitution

431B this occurrence is prevented by insuring a closed metering loop even when the ZERO control causesthe meter pointer t o deflect downscale f r o m zero. By the combined actions of R141 and R179, the z e r o setting of the meter pointer does not coincide with absolute balance of the metering bridge. A slight unbalance of the bridge is maintained by R141, while Rl79provides

a

counter-action in the feedback current-squared generator, Q106, s o that the meter can indicate zero even though the metering bridge balanced. Resistor R179 a l s o is not perfectly

sets

the full scale accuracy of the meter.

4- 31. DC CALIBRATION AND SUBSTITUTION.

4-32. A simplified schematic diagram of the dc cali- bration and substitution circuit is shown in figure 4-9.

Highly accurate rf power measurements can be made using the d c substitution technique given in figure 3-3.

In the dc substitution method dc is used to duplicate the rf power reading. An accurate, known current (Idc) is supplied externally a t the DC CALIBRATION and SUB-

STITUTION terminals. Calculation of the substituted dc power gives

an

accurate measure of the rf power.

Effectively, dc power is substituted for rf power.

4-33. REGULATED POWER SUPPLY.

4-34. A simplified schematic diagram of the power supply is shown i n figure 4-10. The power supply operates f r o m either a 115 o r 230 volt, 50 t o 1000 cps a c source o r f r o m an optional 24 volt, 30 ma rechargeable battery. T h r e e voltages and two current outputs a r e provided by the power supply. Regulated voltages of

-

18 and -25 vdc and unregulated + l . 5 vdc operate the power meter circuits. T h e current outputs a r e used for maintaining battery charge (trickle charge) for recharging the battery.

4-35. The -18 vdc is regulated by a conventional s e r i e s regulator, Q1 through Q5. T h e -25 vdc is developed a c r o s s CR9, a 6.8 volt Zener diode refer- enced a t -18 vdc. The unregulated +1.5 vdc is taken

Model 431B a c r o s s the s e r i e s diodes, CR5 and CR6. The -18 vdc supply is adjusted by R13.

4-36. POWER SWITCH.

4-37. A simplified schematic diagram of the power switching arrangement is shown in figure 4-11. The power switch, S2, has four positions: OFF, AC,

BATTERY ON, and BATTERY CHARGE. In the AC position, the instrument operates from the conven- tional line voltage: if a battery h a s been installed in the instrument, a trickle charge is supplied to the battery. In the BATTERY ON position, instrument operation i s entirely dependent on the battery. In the CHARGE position, -25 volts i s connected to the battery for recharging: the Model 431B cannot be operated during t h i s time. Approximately 37 ma dc i s applied to the battery during charge time.

- 4 0 V F R O M

C R I

Et

C R 4

A

- 2 5 V F R O M

C R 2 CR3

I

REGULATOR

Section IV

Paragraphs 4-36 to 4-37

R 4

WA

-

-

-IBVDC(REG)

CENTER

S D - S - 1 7 7

Figure 4-10. Regulated Power Supply

/

n

JI

A

+

1'

a-

2

v p F F F /

-

I d 2

p G q

- 4 0 VOLT

R E C T l f l E R

POWER

TRANSfORYER

R 2

R3

Q 0

0

-

0

-25

VOLT

RECTlf I E R

-

Z

OPTIONAL

-

BATTERY

T

9

I

I

I

I

5

REGULATOR

-IBV(REG)

+

I.5V (UNREGI

Figure 4-11. Power Switch Arrangement

Section V

Figure 5-1

Model 43

1B

Figure

5 -1. Cover Removal

Model 431B

Section V

Paragraphs 5

-1

to 5

-7

S E C T I O N V

M A I N T E N A N C E

5-1. I N T R O D U C T I O N .

5-2.

This section includes instructions and informa- tion for the maintenance, troubleshooting and repair of the Model 431B Power Meter.

5-3. The testing and repair of

@

Model 486A and

478A thermistor mounts a r e discussed in the Oper- atingNotes for each instrument. Complex procedures and special equipment a r e needed for some of these operations. Therefore, if the trouble proves t o be a thermistor mount, contact an @ f i e l d office f o r a s s i s t - ance. Except

as

stated in the Operating Note, DO NOT

ATTEMPT TO

5 - 4 . C O V E R R E M O V A L A N D R E P L A C E M E N T .

5-5. Refer t o figure 5-1 when removing instrument covers. Removal of the top cover exposes the circuit a r e a s shown in figure 5-2. Routine checksand adjust- covers. However, operations such a s soldering on the circuit board and removal of the meter. RANGE

POWER, o r MOUNT RES switch would require the removal of the bottom cover and one, o r both, of the side covers.

5-6. TOP COVER REMOVAL. a. At the r e a r of the instrument, remove the two screws which retain the cover. b. Grasp the cover from the r e a r , slide i t back 1/2 inch, then

tilt

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

5-7. TOP COVER REPLACEMENT. a. Rest the cover flat on the cast guides projecting inward near the top of each side frame (see

@

, figure 5-1). b. Slide the cover forward allowing i t s forward edge to enter the groove in the front panel. c. Replace the two cover retaining screws.

Instrument

Type

DC voltmeter

Ohmmeter

Precision milliammeter o r

Power Meter

Calibrator

Milliammeter

Oscilloscope o r

AC voltmeter

Use

Table 5-1. Test Equipment

DC voltage measurement

Calibration accuracy check

Continuity

& resistance checks

Calibration accuracy check

Battery circuit check

Power supply ripple check

10 kc oscillator- amplifier check

10 kc amplifier check

10 kc amplifier null adjust

Critical Specifications

Instrument

Recommended

@

405BR/CR

Range: 0.5 to 50 volts dc

Accuracy: 0.2%

Resolution: three digit

Range: 1 ohm to 10 megohms

Accuracy: 5% of full scale

@

410B

@

412A

Milliammeter Accuracy: 0.1% of full scale

Range: 0 to 30 ma

Calibrator Current accuracy:

0.1%

Resistance accuracy:

0.2%

Sensitive Research

Instrument Corp

Model B, Bamilek

@

8402A Power

Meter Calibrator

Range: 3 to 60 ma dc

Accuracy: 5%

Oscilloscope

@

412A

@

4 2 8 A / ~

Bandwidth: 100 kc

Accuracy: 5%

Input impedance:

1 megohm

Sensitivity: 1 mv/cm

@

130B/C

@

120B

@

122A

AC voltmeter Accuracy: 5%

Input impedance:

1 megohm

Range:

.

01 to 100 mv

@

4 0 0 ~ / H / L

@

403A/B

Section V

Paragraphs 5-8 to 5-9

Instrument

Type

DC Source o r

Power Meter

Calibrator

Thermistor Mount

Frequency counter

Variable

Transformer

Soldering Jron

& Tips

Resistor

Resistor

Decade

Resistance

Divider

Precision

Resistor

Decade

Capacitors

Model 431B

Table 5-

1.

Test Equipment (Cont'd)

Use

Calibration accuracy check

Critical Specifications

Range: 0 to 220 vdc o r

Current Output: 0 to 20 ma

Instrument

Recommended

@711A, 712B

Power Supplies

8402A Power Meter

Calibrator

$3

478A, 486A Completion of test circuit

See table 1-2 f o r list of suitable mounts

10 kc oscillator- amplifier check

10 kc oscillator-amp- lifier frequency adjust

Power supply adjustment

Repair

5

place readout

Min. input sensitivity: 4 v r m s

Max. frequency: greater than lOkc

Accuracy: better than 0.1%

Range: 103 to 127 vac

@

7-1/2 amp

206 to 254 vac

@

4 amp

Voltmeter range: 100 to 127 vac

200 to 254 vac

Voltmeter accuracy:

i

Wattage rating: 50 watts

Min tip temp: 800°F

Tip s i z e O.D. : 1/16" to 3/32

@521C o r

E

($3

5212A

@

55128

General Radio type

W lOMT3A

Ungar #776 solder- ing iron handle

Ungar #PL333 tiplet

Ungar #854 Cup tip

Dale

Type RS-2

Charging checks

Charging checks

Value: 780 52

Accuracy: 1%

Wattage: 3 watts

Value: 7500 52

Accuracy:

*

1%

Wattage: 2 watts

Zero and vernier control adjustment

Full scale accuracy

adj

Range: 5 0 8 to 50K 52

Multiple: 10 8

Accuracy:

Zero and vernier control adjustment

Value: 1000 8

Accuracy:

+

0.1%

Wattage: 0.25 watts

Oscillator frequency adjustment

Coarse null adjustment

Range: 10 to 1000 pf

Capacitance per step: .0001 pfd

Accuracy: . I % per decade

Electra MF2, T-0

GR1432P Decade

Resistance Box

Ultronex

Type 205A

General Radio

Type 1419-B

5-8. BOTTOM COVER REMOVAL. a . Set the tilt stand a s shown in figure 5-1. b. Remove the two retaining s c r e w s a t the r e a r of the cover. c. Slide the cover rearward f a r enough to free i t s forward edge from the front foot assembly. d. Tilt the forward edge of the cover upward and lift the cover from the instrument.

5-9. BOTTOM COVER REPLACEMENT. a. Set the tilt stand a s shown in figure 5-1. b. Rest the bottom cover flat on the cast guides projecting inward near the bottom of each side frame

(see

@

, figure 5-1). c. Slide the cover forward on the guides s o that the formed portion at the r e a r of the cover slides over the two short pro'ections a t the r e a r corner of each side f r a m e (see

6

d. Replace the two retaining screws and the r e a r foot assembly.

Model 431B

5-10.

SIDE

COVER REMOVAL.

5-11. The side covers cannot be removed untilthe top and bottom covers a r e off (see paragraphs 5-6and 5-8).

Each side cover is held in place by four s c r e w s retained by nuts which are not fastened to the side frames.

Note

Replace side covers before replacing either the top o r the bottom cover.

5-12. TEST EQUIPMENT.

5-13. Any instruments which satisfy the specifications of table 5-1 can be used f o r the t e s t s described in this maintenance section.

5-14.

TROUBLESHOOTING.

5-15. The f i r s t step in troubleshootingthe Model 431B

Power Meter should be isolation of trouble to the thermistor mount and thermistor mount cable o r to the power meter itself. The thermistor match check in the maintenance section of the

@

Operating Note per- taining to the thermistor mount in use will indicate a defective thermistor o r thermistors. A simple ohm- meter continuity check and inspection of the thermistor mount cable and i t s connectors can be used to prove the cable.

Section V

Paragraphs 5-10 to 5-18

5-16. Table 5-2, Troubleshooting, and the following detailed t e s t s a r e given to aid in correcting trouble within the Model 431B. To localizing of trouble easier, the 431B circuitry is divided into five sections; the power supply, the 10 k c oscillator-amplifier (in- cluding the rf bridge), the 10 kc amplifier

(including the metering bridge), the d c metering and feedback amplifiers, and the squaring circuit. T e s t s a r e given for each of these sections.

5-17. THE POWER SUPPLY.

5-18. The d c t e s t point voltages shown on the power supply schematic diagram, with two exceptions, apply t o instruments operated from either a c o r battervpri- mary power. voltage limits shown a t C l and C2-apply only t o instruments operated from a c primary power.

Refer t o figure 5-2, Top View, for component location. a. Connect Model 431B t o a variable line transformer and s e t transformer for 115 vac (or 230 vac). b. Connect a dc voltmeter (see table 5-1 for volt- meter requirements) between the negative terminal of

C6 and Model 431B ground. The voltage here should be -18 vdc; adjust with potentiometer R13. c. With the voltmeter connected a s above, test the regulation of the power supply (for instruments

Trouble Indication

Null impossible

Meter does not indicate, does not zero but does null

Meter pointer drifts during readings

Table

5

-2. Troubleshooting

Possible Cause

Thermistor mount

Thermistor mount cable

MOUNT RES switch

TI02

Q106

Thermistor mount

Q106, Q107

Thermistor mount in unstable thermal environment

R F s o u r c e unstable

DC calibration/substitution source unstable

Oscillator -amplifier

10 kc amplifier

Interference from external 10 kc signal

ZERO o r VERNIER potentiometer Rotation of the ZERO o r VERNIER control r e s u l t s in e r r a t i c movement of the meter pointer on the

- 0 1 MW range

Movement of the thermistor mount cable causes ab- rupt flicker of the meter pointer on the. 01

MW

range

Meter pointer stays down s c a l e

Thermistor mount

Thermistor mount cable

TI02

Thermistor mount

Thermistor mount cable

Power supply

Meter

RECORDER jack

Q106

C102, ClOl

10 kc amplifier

-

Section V

Paragraphs 5-19 to 5-24

Trouble Indication

Meter pointer stays up s c a l e

Table 5 -2. Troubleshooting (Cont'd)

Possible Cause

TI02

Oscillator failure

Thermistor mount cable

Large unbalance in the metering bridge

C105

C104

10 kc amplifier failure

Model 431B

Calibration inaccurate, all power ranges Thermistor mount in strong rf field

Interference from s t r a y 10 kc signal

Thermistor mount

Meter not mechanically zero-set

Meter

MOUNT

RES

Power supply switch

Battery

10 kc amplifier

Resistor, collector QlOl

Q107, Q106

Q102

Calibration inaccuracy, NOT a l l power ranges

Zero setting does not c a r r y over f r o m range to range within specification

R e s i s t o r s emitter Q107

Q106

10 kc amplifier

Q106

R141

Q104 operated from a c primary power) by varying the line voltage +lo% about the nominal 115 o r 230vac. T h e r e should be no perceptible variation of the -18 vdc. d. If -18 volts cannot be obtained by adjustment of

R13, o r if regulation is not satisfactory, proceed with the following t e s t to determine the causes:

(1) Use a dc voltmeter (see table 5-1) to check the a c voltage limits a t the points listed in table 5-3.

See figure 5-2, top view, for component loca- tion.

A l l voltages a r e measured with reference to the Model 431B ground.

(2) Check ripple voltages (ac operation), using an a c voltmeter o r oscilloscope, a t the points listed in table 5-4. Table 5-1 gives require- ments for the voltmeter o r oscilloscope.

5-19. If the power meter does not function normally

(e.g., pointer driven t o i t s limits, nopower indication) and power supply regulation isunsatisfactory, another circuit area, such a t the 10 kc oscillator-amplifier o r 10 kc amplifier, could be the cause.

5-20. A -18 vdc supply which is s e t high o r low causes calibration inaccuracy of the Model 431B.

5-21. 10-KC OSCILLATOR-AMP LIFIER CHECK.

5-22. T e s t s of the oscillator-amplifier should be made according to the step sequence in which they appear below.

A dc voltmeter, an a c voltmeter o r oscil- loscope and a frequency counter a r e needed f o r the t e s t s (see table 5-1 for t e s t instrument specifications).

Figure 5-2, Top View, shows component location.

5-23. STEP

1. a. Connect the oscilloscope between the positive lead of C125 and ground, check the 10 kc oscillator- amplifier output amplitude and waveform. Output amplitude, with a 200 ohm thermistor mount con- nected t o the Model 431B, should be 15 vac i20% peak-to-peak. If a 100-ohm mount is used, the amplitude should be 8 vac i20% peak-to-peak. The waveform must be sinusoidal with only slight c r o s s - over distortion (caused by QllO and Q111). b. Check the frequency of the oscillator-amplifier.

If a Model 478A thermistor mount is used, terminate the rf input to the mount in 50 ohms. A Model 486A thermistor mount does not require termination. Con- nect the frequency counter between the positive lead of C125 and ground. With Model 478A thermistor mount connected t o the Model 431B, the oscillator- amplifier frequency should be 9750-10,000 cps. With a Model 486A thermistor mount connected, the fre- quency should be 10 kc i 5 0 cps.

5-24. STEP 2. a. Connect the oscilloscope between the base of

Q108 and ground; observe the amplitude of the feed- back signal t o the oscillator-amplifier. I t must be l e s s than 12 mv peak-to-peak: if not, 10 kc oscillator- amplifier gain is incorrect. The cause couldbe Q108,

Q109, C124, L101, L105 o r T101. IfTlOl is the cause of trouble u s e a special soldering tip t o remove i t from etched circuit board (see table 5-1).

Model 431B

Test Point

Minus end of C1

Minus end of C2

Anode of CR8

Anode of CR7

Minus end of C6

Base of Q1

Anode of CR9

Plus end of C1

Section V

Tables 5-3, 5-4, 5-5

Table 5 -3. Power Supply DC Voltage Checks

DC Voltage Limits Voltage Out of Limits, Check

-38 to -43

-24 t o - 2 7

-10.7 to -12.3

-

6.0 to

-

7.5

-18

-18.3 to -18.6

-24.0 to -25.6

+

1.4 to +1.5 a c line voltage, CR1, CR4, C1 a c line voltage, CR2, CR3, C2, battery

CR8

CR7,

@

R13,

Q1, Q3, Q2, CR7

CR9, POWER switch

CR5, CR6

Table 5-4. Power Supply Ripple Checks

AC Voltage Limits

Voltage Out of Limits, Check

Peak-to-Peak

R. M. S.

1.8 v

max.

1.1 v max.

10.6 mv max.

5 v m a x .

3 v m a x .

30 mv max. cR1, CR4, C1

CR2, CR3, C2, C6, Q13

Q1 to Q5, CR7, CR15, C2, C6

Test Point

Minus end of C1

Minus end of C2

Minus end of C6

Test Point

Collector of QllO

Emitter of Q109

Minus

end of C12 1

Table 5-5. 10 KC Oscillator-Amplifier DC Voltage Checks

DC Voltage Limits

-18

-10.0 to -14.0

-

5 . 0 t o

-

6.5

Voltage Out of Limits, Check

Power Supply

Q108, Q109, C122, C121

C121, Q108, R153

Test Point

Table 5-6. 10 KC Amplifier DC Voltage Checks

DC Voltage Limits

Voltage Out of Limits, Check

Emitter of QlOl

Collector of QlOl

Positive end of C116*

*

Short base to emitter of QlOl

-1.5 to -2.5

-4.5 to -6.0

-3.5

to

-4.5

I

C112, R116, R115, C110, QlOl

Q101, C113, R117 to R124

Q103, R132, Q102, C115

Test Point

Cathode CR113

Cathode CR112

Cathode C R l l l

Cathode CRllO

Cathode CR109

Cathode a 1 0 8

Table 5-7. DC Voltages in Squaring Circuit

DC Voltage Limits Voltage Out of Limits, Check

+

10.30 to

+

10.46

+

8.50 to

+

9.64

+

6 . 4 1 t o + 6.51

+

4.39 t o + 4.47

+

2 . 4 8 t o + 2.52

0

CR113, R167, R173

CR112, R174, R168

CR111, R175, R169

CR110, R176, R170

CRlO9, R177, R171

CR108, CR109 to a 1 1 3

Section

V

Paragraphs 5-25

POWER

SUPPLY

BATTERY

R179

DC METERING AND

FEEDBACK CIRCUITS

R13

-18V

REG. AOJ.

SYNCHRONOUS

UP-S-1149 i

Figure

5-2.

Top View

b. Using the

dc

voltmeter,

make

at the p o w

listed

in

table

5-5.

Xf ttte

presence of

10 kc signal interleres with the dc measurements,

the

10 kc oscillator can

be

disabled,

witbout appreciably affecting

the

dc voltages,

by

grounding the collector of Q109.

DC

voltages are measured with reference to

the

Model 4S1B

5-25.

STE2

3. If

there is no 10 kc output from oscillator-amplifier proceed

as

f0lbw8:

the

a, Maconnect the thermistor mount.

b.

Maconnect the poeitlve circuit board.

lead

of

C125

from

the

c. Make a direct connection between

the

positive lead of C125 and bridge

side

of

C120

the underside of the circuit

board).

(terminal

35

on d.

Using

the

oscilloscope, monitor the

[email protected]

of the oscillator-amplifier.

If

oscillation

is

present,

the

mebring and rf bridges

should

be

examined

for defect.

The waveform of the oscillation under

this

condition

may

show

limiting.

Model 431B

5-26. If component replacement is required a s a result of the foregoing tests, note the following: a. After replacement of QllO o r Q111, check the amplitude of the 10 kc oscillator-amplifier output

(paragraph 5-23a). b. If Q108 o r Q109 has been replaced, check the out- put frequency of the oscillator-amplifier (para. 5-23b). c. After replacement of L105 o r C124, readjustment of the oscillator frequency could be necessary. See paragraph 5-58 for this procedure.

5-27. 10 KC AMPLIFIER CHECK.

5-28. A dc voltmeter and oscilloscope a r e needed for checking the 10 kc amplifier. Table 5-1, T e s t Equip- ment, gives equipment requirements. Refer to figure

5-2, Top View, for component location.

5-29. Table 5-6 l i s t s dc voltage check points and possible causes for deviations from the given limits.

All voltages a r e referenced to the Model 431B ground.

If the presence of a 10-kc signal interferes with dc measurement, ground the center tap of L102.

5-30. Calibration inaccuracy, common to all power ranges, can be caused by the 10 kc amplifier. In particular, an out-of-tolerance r e s i s t o r in the collector of QlOl o r a defect in the Q102 stage, which r e s u l t s in improper gain, will produce calibration e r r o r .

5-31. An open signal path o r very low gain in the 10-kc amplifier can drive the meter pointer to its downscale limit. For signal tracing, the 10 kc e r r o r signal from the metering bridge can be used, o r C110 can be discon- nected and used a s a means of injecting a substitute

10 kc t e s t signal.

Note

A special soldering tip is required to replace transformer T102. Refer to table 5-1 forthe type of soldering tip to be used.

5-32. METERING AND FEEDBACK CIRCUIT.

5-33. Before performing this procedure r e f e r to para- graphs 5-69 and 5-70 and check values o f R 1 4 1 a n d

R179. The differential amplifier (Q104 and Q105), the feedback current squared generator (Q106), the feed- back current generator (Q107), and the squaring circuit comprise the metering and feedback circuit. See figure

5-2, top view, for component location.

Note

Transistors Q106 and Q107 a r e selected for optimum calibration accuracy. If Q106 o r

Q107 is replaced, check calibrationaccuracy using procedure given in paragraph 5-76 o r

5-78. It may be necessary to t r y several transistors to get proper calibration accuracy.

5-34. SQUARING CIRCUIT CHECKS.

5-35. A check of the squaring circuit is advisable if full scale o r tracking accuracy of the Mode1 431B does not meet specifications. The squaring circuit includes

CR108 through CR113 and R167 through R177. Figure

5-2, Top View, shows component location.

Section V

Paragraphs 5-26 to 5-43

5-36. The squaring circuit i s tested under two condi- tions: (1) when a l l diodes a r e conducting, and (2) when no diodes a r e conducting. Both conditions should be used whenever the squaring circuit is tested.

5-37. A digital voltmeter (see table 5-1 for specifica- tions) is recommended for the following measurements.

5-38. DIODES CONDUCTING. The following pro- cedure measures the forward voltage drop of each diode in the squaring circuit. a. Set the Model 431B RANGE switch to 1 MW, and adjust the ZERO and VERNIER controls for exact full s c a l e deflection of the meter pointer. b. Disconnect the grounding link a t the digital volt- meter input, and measure the voltage drop a c r o s s the individual diodes of the squaring circuit. The require- ment is 0.4 to 0.5 vdc.

5-39. DIODES OFF. The t e s t points listed in table

5-7 a r e the midpoints of five two-resistor voltage dividers connected between -18 vdc and ground. This check verifles that each diode is properly backbiased. a. Adjust the Model 431B ZERO control for a below- zero deflection of the meter pointer. b. Connect the voltmeter (ungrounded input) be- tween the regulated -18 vdc supply and the t e s t points listed in table 5-7. The voltmeter readings should be within the limits specified in the table.

5 - 4 0 . BATTERY A N D C H A R G I N G CHECKS.

5-41. The information and procedures which follow pertain to power m e t e r s having the optional nickel cadmium battery. The battery is an assembly of 20 individual, permanently sealed cells connected in s e r i e s . At full charge, battery terminal voltage terminal voltage by approximately 1.3 volts.

5-42. BATTERY CHECK.

5-43. BATTERY VOLTAGE. A dc voltmeter is needed for this test. See table 5-1 for voltmeter requirements. a. Make s u r e that the Model 431B i s disconnected from the a c line. Connect the dc voltmeter between the BATTERY

- and BATTERY

+ terminals on the etched circuit board. b. Set the POWER switch to BATTERY ON and observe the voltmeter reading. Battery voltage should be -24 t o -27 volts. If i t is not, and the battery has been charged, check the charging circuits and the current drain imposed by the Model 431Bcircuitry.

If the state of charge of the battery is uncertain, allow a 48-hour recharge, then recheck the battery voltage. Check the charging circuits if the battery voltage is still not within 27 *1 volt.

Section

V

Paragraphs 5-44 to 5-55

5-44. BATTERY CURRENT DRAIN. The current supplied by the battery to the Model 431B circuitry should be checked i f the battery does not seem to maintain a charge. A clip-on or series-connected current meter (see table 5-1) is required for the following procedure. a. Check that the Model 431B is disconnected from the ac Line. b. Connect the current meter to monitor the current in one of the leads between the battery terminals and the BATTERY

- and BATTERY

+ terminals on the circuit board. c. Set the POWER switch to BATTERY ON and observe the reading on the current meter;

it

should read 40 to 53 ma.

5-45. CHARGING CHECKS.

5-46. The following procedures test the recharge and trickle charge capability of the Model 431B. A direct current meter (see table 5-I), a 7500 ohm*l%, 2 watt resistor and a 780 ohm

*l%, quired for these tests. The battery i s disconnected from the BATTERY

- and BATTERY

+ circuit board terminals during both tests.

5-47. TRICKLE CHARGE CURRENT. The following procedure is used to check the trickle charge current applied to the battery whenthe power meter is operated from ac primary power. a. Connect the 7500 ohm 2-watt resistor between the BATTERY

- and BATTERY

+ terminals of the circuit board. b. Connect the current meter to monitor the current through the resistor. c. Connect the Model 431B to the ac line, set the

POWER switch to AC, and observe the reading of the current meter. Trickle-charge current should be 3.2 to 4.8 ma.

5-48. CHARGE CURRENT. The following procedure checks the current supplied for recharging the battery. a. Connect the 780 ohm 3-watt resistor between the

BATTERY

- and BATTERY

+ terminals of the circuit board. b. Connect the current meter to monitor current through the resistor. c. Connect the Model 431B to the ac line, set the

POWER switch to BATTERY CHARGE, and observe the reading of the current meter. Charging current should be

27 to 40 ma.

5-49.

A battery which will not assume rated terminal voltage with proper charging current may have adefec- tive cell o r cells. In such cases the battery must be replaced (see section VI Table of Replaceable

Parts).

Model 431B

5-50. BATTERY WARRANTY.

5-51. The warranty, appearing on the inside of the rear cover of this manual, also applies to the acces- sory battery (option 01). Within the warranty period, the battery may be returned to

@

Customer Service for repair or replacement.

5 - 5 2 . REPAIR.

5-53. The etched circuit board used inthe Mode1431B is of the plated-through type which consists of a base board and conductor. The board does not include funneled eyelets. The conductor material i s plated to the wall of the holes; thus the conductor is effectively extended into the hole. This type of board can be soldered from either the conductor o r component side of the board with equally good results. The rules given below should be followed when repairing a plated- through type etched circuit board. a. Avoid applying excessive heat when soldering on the circuit board. b. To remove a damaged component, clip component leads near the component; then apply heat and remove each lead with a straight upward motion. c. Use a special tool to remove components having multiple connections, such a s potentiometers, trans- formers, etc. Refer to table 5-1 for type of soldering tip required. d. Use a toothpick to free hole of solder before in- stalling a new component.

5-54. M E C H A N I C A L A D J U S T M E N T O F

METER Z E R O .

5-55. When meter

is

properly zero-set, pointer rests over the zero calibration mark on the meter scale when the instrument i s 1) at normal operating temper- ature, 2) in its normal operating position, and 3) turned off. Zero-set a s follows to obtain best accu- racy and mechanical stability: a. Allow the instrument to operate for at least 20 minutes; this allows the meter movement to reach normal operating temperature. b. Turn instrument off and allow 30 seconds for all capacitors to discharge. c. Rotate mechanical zero adjustment screw until pointer

is

on zero. Reverse direction of adjustment screw approximately 3" in order to free adjustment screw from meter movement. If the pointer moves while freeing the adjustment screw, this step must be repeated.

Note

Use of the parallax-eliminating mirror on the meter scale increases the accuracy of the mechanical zero-set.

5 - 5 6 . ADJUSTMENTS.

5-57. POWER SUPPLY ADJUSTMENT. a. Connect a dc voltmeter (see table 5-1 for re- quired specifications) between the negative end of

C6 and Model 431B ground. b. Adjust -18 v REG. ADJ., R13, for -18 vdc. c. Vary line voltage from 103 to 127 vac (207 to 253 vac): -18 vdc should not vary perceptibly.

5-58. OSCILLATOR FREQUENCY ADJUSTMENT.

5-59. If

both

100 and 200 ohm thermistor mounts a r e tobeused interchangeably with the Model 431B, the frequency of the 10 kc oscillator-amplifier should be adjusted in the following sequence: the 200 ohm mount procedure, paragraph 5-61, then the 100 ohm mount procedure, paragraph 5-62. If only one type of mount will be used with the power meter only the appropriate procedure is required.

5-60. An oscilloscope and frequency counter a r e needed for these adjustments. See table 5-1, T e s t

Equipment for requirement. A plastic alignment tool should be used for the adjustment of LlOl t o avoid core damage.

5-61. 200 OHM MOUNT. The following procedure adjusts the 10 kc oscillator frequency when a 200 ohm thermistor mount is connected to the Model 431B. a . Connect the 200

St thermistor mount and cable to the Model 431B; s e t the MOUNT RES switch to 200 52. b. Connect the frequency counter between the plus end of C125 and ground; adjust L101 to give a frequency of 10,150 cps. c. Connect the oscilloscope to the base of Q108 and observe the feedback signal amplitude. It should not exceed 12 mv peak-to-peak.

5-62. 100 OHM MOUNT. The following procedure adjusts the 10 kc oscillator frequency when

a

100 ohm thermistor mount is connected t o the Model 431B. a. Connect the 100 ohm thermistor mount and cable to the Model 431B, and s e t MOUNT RES t o 100

52.

b. Connect the frequency counter between the posi- tive end of C125 and ground. The frequency should be

10 KC rt50 cps. If i t i s not, proceed with step c. c. Substitute values of capacitance for

C l O l until the frequency is within the limits of step b.

Note

A decade capacitance box can be used to de- termine proper value of capacitance that must

be

used (see table 5-1).

Section V

Paragraphs 5-56 to 5-68

5-

63.

COARSE NULL ADJUSTMENT.

5-64. If both 100 and 200 ohm thermistor mounts a r e t o be used interchangeably with the Model 431B, the coarse null adjustment should be made in the following sequence; the procedure in paragraph 5-67 first, and then the procedure in paragraph 5-68.

5-65. If only

a

200 ohmthermistor mount is to be used with the power meter, follow the procedure of para- graph 5-68. When only a 100 ohm thermistor mount is to be used, the procedure of paragraph 5-67

is

sufficient.

5-66. An oscilloscope o r a c vtvm is needed for these adjustments. See table 5-1, T e s t Equipment, for requirements. A plastic alignment tool should be used f o r the adjustment of L102 toavoid core damage.

5-67; 100 OHM MOUNT. The following procedure is used t o make coarse adjustment of the null when a 100 ohm thermistor mount i s connected to the Model 431B. a. Set MOUNT RES to 100

St.

b. Observe the arrangement and travel of null capacitor C103, then mechanically center C103.

c.

Connect the oscilloscope o r a c vtvm between ground and the base of Q103. d. Switch the Model 431B on and s e t RANGE to

10 MW. e. Adjust the ZERO control t o maintain a meter indication of

less

than 5% of full scale on the Model

431B while adjusting L102 f o r a minimum indication on the oscilloscope o r vtvm. f. Set RANGE to .01 MW and repeat step e, this time maintaining an on-scale meter indication on the

Model 431B. g. Move the oscilloscope o r vtvm connection from the base of Q103 to the lead of R138 nearest T103. h. Adjust null capacitor C103 to minimize oscillo- scope o r vtvm indication. Minimum indication should occur with the capacitor near the center of i t s range.

Note: A decade capacitance box can be used to determine the value of capacitance to be added ( r e f e r to table 5-1). i. SetModel 431B RANGE switch to NULL. Adjust the null capacitor, C103, for a minimum indication on the Model 431B meter. Minimum indication should occur a t l e s s than 4% of full scale and C103 should be near i t s mid-range.

- a

100-ohm thermistor mount will b e used with the Mode1 431B, the value of C104 may be changed to obtainthe null r e - quirements specified above.

5-68. 200 OHM. The following procedure i s used to make coarse null adjustment when a 200-ohm therm

- istor mount is connected to the Model 4318. a. Set MOUNT RES to 200

Q

.

Section V

Paragraphs 5-69 to 5-74 b. Set RANGE to . O 1 MW. c. Connect the oscilloscope or vtvm between ground and the lead of R138 nearest T103. d. Mechanically center the null capacitor, C103, by observing i t s rotor plates. e. Using the ZERO andVERNIER controls, maintain an on-scale indication on the Model 431B meter while substituting values for C105 to obtain a minimum indication on the oscilloscope o r vtvm. f. Adjust C103, the null capacitor, to improve the minimum indication on the oscilloscope o r vtvm. The null capacitor should be near mid-range.

Note

A decade capacitance box can be used to de- termine the value of capacitance to be added

(see table 5-1). g. Set RANGE to NULL. The Model 431B meter deflection should be l e s s than 4% of full scale. If i t

is

not, increase the value of C104 in approximately 50 pf increments t o a maximum value of 500 pf. If 100 and

200 ohm thermistor mounts a r e t o be used, repeat the null procedure for 100 ohm mounts (paragraph 5-67) after each increase in capacitance of C104.

5-69. ZERO AND VERNIER CONTROL ADJUSTMENT. a. Connect a dc digital voltmeter (see table 5-1) a t the Model 431B RECORDER jack. Use a special telephone-plug-to-dual-banana-plug cable assembly terminated with a 1000-ohm i0.1% 0.25-watt wire- wound resistor. b. Set Model 431B RANGE t o

. O 1

MW, and adjust

Model 431B ZERO and VERNIER controls for z e r o meter reading on the Model 431B. c. Set Model 431B RANGE to 10 MW. d. Connect a decade resistance box a c r o s s R141

(see figure 5-2), and adjust to obtain zero indication on Model 431B Power Meter. e. Note amount of resistance required from r e s i s - tance box to obtain z e r o indication. f. Remove the decade resistance box, and replace with resistor of value noted in step e. g. Check the Model 431B range-to-range zero drift by 1) setting Model 431B RANGE to .01 MW, and re- adjusting i t s VERNIER for z e r o meter reading, 2) switching the Model 431B through

its

complete range while observing the digital dc voltmeter reading. T e s t limits: digital dc voltmeter reading must not exceed

1 5 mv (10.005V) on any Model 431B range.

5-70. FULL SCALE ACCURACY ADJUSTMENT. a. Connect a

@

Model 8402A (see table 5-1) a t the

Model 431B POWER METER terminals. Check that

Model 8402A OUTPUT CURRENT is off.

Model 431B b. Set Model 431B RANGE t o 10 MW; s e t Model

8402A RANGE (MW) to 10 MW, and FUNCTION to CAL. c. Adjust the Model 431B ZERO and VERNIER controls for a z e r o indication on the meter. d. Set Model 840211 OUTPUT CURRENT to ON; connect decade box a c r o s s terminals of R179. Adjust decade box for a reading of exactly 10 mw on 431B panel meter. Switch Model 8402A to 8 mw, 6 mw,

4

mw,

then 2 mw. Model 431B panel meter should track within i2% of full scale (see table 5-8). Dis- connect decade box. e . Set Model 8402A OUTPUT CURRENT to OFF. f. Set Model 431B RANGE to 3 MW; s e t Model

8402A RANGE

(MW)

MW. g. Reset Model 431B VERNIER to z e r o the meter, if necessary. h. Set Mode1 8402A OUTPUT CURRENT to ON; note and record the Model 431B percent -of -power- reading e r r o r (1.7%/division on 0-3 meter scale). i. Repeat steps b through h f o r alI Model 431B

RANGE positions. j.

Connect a decade resistance box a c r o s s R179

(see figure 5-2). k. Select the resistance value which equalizes the magnitude of the largest positive and negative percent e r r o r . m. Remove the decade resistance box and replace with a r e s i s t o r of the value selected in step k. n. Check a l l Model 431B RANGE positions. Test limits: the Model 431B full-scale p o w e

r

- r e a d i n g e r r o r must not exceed 3% a t ambient temperatures of

20°C to 35°C on all range positions (refer totable 5-8).

5-71.

P E R F O R M A N C E CHECK.

5-72. The t e s t s described below which verify that the

Model 431B meets specifications, use only panel con- t r o l s and connectors. These t e s t s can beused for in- coming quality control, for routine preventive main- tenance, and after repair. A thermistor mount must be connected t o the Model 431B for the performance checks, though no rf power will be applied.

Note

If there is possibility of rf pick-up, the ther- mistor mount should be appropriately shielded.

5-73. Check the mechanical zero-set of the Model

431B meter according to paragraph 5-54.

5-74. ZERO CARRY-OVER CHECK. a. Set Model 431B RANGE to . O 1 MW.

Model 431B b. Adjust ZERO and VERNIER controls to set the meter pointer over the zero calibration mark. c. Rotate RANGE through its .03,

.

1, .3, 1, 3, and

10 MW positions, observing the accuracy of the zero setting a t each position. The z e r o must c a r r y over from range to range within fO. 5% of full scale.

5-75.

CALIBRATION AND RANGE TRACKING

ACCURACY.

5-76. Calibration and range tracking accuracy is verified by dc substitution. Briefly, dc substitution involves 1) applying enough direct current a t the DC

CALIBRATION & SUBSTITUTION terminals to obtain the desired meter indication

2)

accurately determining the applied current and 3) calculating the dc power applied. The difference between the substituted dc power and the meter indication it produced is the cal- ibration e r r o r . The

@

Model 8402A Power Meter

Calibrator, o r other means of producing accurate direct currents,

is

used a s the substitution source.

Section V

Paragraphs 5-75 to 5-80

5-77. CALIBRATION AND TRACKING ACCURACY

TEST USING THE

@

MODEL 8402A POWER METER

CALIBRATOR. The Model 8402A Power Meter Cal- ibrator provides constant currents sufficient to cause full scale meter indication on each of the Model 431B power ranges. It also has provision for checking the tracking accuracy of the Model 431B on the 10 mw range.

5-78. Refer to the Operating and Service Manual of the Power Meter Calibrator for correct testprocedure.

5-79. ALTERNATE METHOD FOR CHECKING CAL-

IBRATION AND RANGE TRACKING ACCURACY. The calibration and range tracking accuracy of the Model

431B can be checked by dc substitution using the equip- ment and connections shown in figure 3-3.

5-80. Using the data in table 5-8 the full scale cal- ibration accuracy of each range and the tracking accuracy of the 10 mw range can be tested.

Full

Scale

Test Point

Table 5-8. Data for Calibration, Tracking Accuracy Check

Tracking

Substitution Current (Idc)

Mount Res

100

2

200

51

s

Model 431B Meter Reads

10 mw

3 mw

1 mw

. 3 mw

1 mw

.03 mw

. O l mw

8 mw

6 mw

4 mw

2 mw

20.00 ma

17.89

15.49

12.65

8.94

10.95

6.32

,

3.46

2.00

1.10

0.632

14.14 ma

12.65

10.95

8.94

6.32

7.75

4.47

2.45

1.41

0.775

0.447

9.7 t o 1 0 . 3 mw

7 . 8

5.8

to

8.2 mw

to

6.2 mw

3 . 8

to 4.2 mw

1 . 8

to

2 . 2 m w

2.91 to 3.09 mw

0.97 to 1.03 mw

0.291 to 0.309 mw

0.097

to

0.103 mw

0.0291 to 0.0309 mw

0.0097 to 0.0103 mw

Section V

Figure 5

-3

WAVEGUIDE

--------

----------

----1

CONDUCTING

I

1

CABLE TO

4

3

:g

5

6

I

I

DETECTION

I

COMPENSATION

THERMISTOR

-

THERMISTOR

1

WAVEGUIDE THERMISTOR

MOUNT

@

4 8 6 A

I

I

RF SHIELD

-1

2

0

SIOIO---

p i G E q

{

:

I

I

Model 43

1B

NOTES: o

=

CONNECTION BETWEEN PIN 5 ON JlOl

AND TERM

4

ON ASSY 101 IN STANDARD 431B

B.

OPTION 10;

PAGE

I

2

I

I

I

P/O a 0 1

- -

Figure

5-3.

Power Meter Assembly

- -

,

I/

I\

-

L103

2.5MH

-

-

- -

-

Model

431B

I

- -

-

-

I

-

-

A

/

"

PI0

_AIOL

EMITTER

/$1

FOLLOWER

0110/0111

\t

I

-18'4

- -

FEEDBACK CURE

1

I

-

-

AlOl POWER METER ASSEMBLY

-

-

-

-

- -

-

Section

V

Figure

5-3

FEEDBACK CURRENT

GENERATOR

Q107

1 8 5 4 - 0 0 0 3

ONOUS DETECTOR

7

R138

1500

4 )

>LC117

~OUF--+

-

NOTES:

14

R I ~ I *

39

K

1

R142

1 2 0 0

!t

CR106

DIFFERENTIAL

AMPLIFIER

I

I

I

I

REFERENCE DESIGNATORS

AlOl

CIOI -106, 110

-

I 2 5

CRIOI- 113

5101. 102. 103

LIOI

-

I 0 5

M

101

0101-111

R

101-103. 1 0 5 - 111,113-144.

150-155. 160- 181 s101.102

TI01

-

I 0 4

UNASSIGNED: R112

I. DC VOLTAGE UMITS GIVEN AT

VARIOUS POINTS THRU

CIRCUIT.

2.

A THERMISTOR MOUNT I S

CONNECTED TO T H E 4 3 1 8

FOR THESE MEASUREMENTS.

&

CHASSIS GROUND

3. CIRCUIT EOARD COMMON

COPYRIGHT

1962

BY

NEWLETT-

PACKARD COMPANY

4 > 1 8 - P W m . M E T E R - 10118

4. A L L VALUES I N OHMS AND

PICOFARADS. UNLESS

OTHERWISE INDICATED.

5.

FRONT PANEL

ENGRAVING

7.

6.

.

I r---7

REAR PANEL

---

ENGRAVING

0

ROTARY SWITCH OR

-

m m

DC

IOKC

IOKC ERROR SIGNAL

8.

3C

VALUE SELECTED AT FACTORY;

AVERAGE VALUE SHOWN

9

0

VOLTAGE MEASURED WITH

RESPECT TO -18V REG.

10.

@

TEST POINT

Figure

5 - 3 .

Power Meter Assembly

3

I

P I 0 A l O l !O_WER M E T E R A s s Y

7

-

-

-

-

+

Rl43 AND R l 7 e l

- - - -

- - - -

-

-

1

COPYRIGHT 1902 B Y HEWLETT-PACKARD COMPANY

'?

9 zw-

S-PO.".

2 2 # < b C '

Figure 5-4.

Power

Supply

7.

3.

4 '

+

C H A S S I S GROUND

F R O N T PANEL

r

-

-

-

7

ENGRAVING

REAR PANEL

ENGRAVING

5 .

6.

@

SCREWDRIVER ADJUSTMENT

0

ROTIRY SWITCH

@

TEST POINT

Model 431B

Section VI

P a r a g r a p h s

6-1 6-7

6-1. INTRODUCTION.

S E C T I O N V1

REPLACEABLE P A R T S

6-2. This section contains information for ordering replacement parts. Table 6-1 l i s t s p a r t s in alpha- numerical o r d e r of t h e i r reference designators and indicates the description and

6 part, together with any applicable notes. Table 6-2 lists p a r t s in alpha-numerical o r d e r of t h e i r

&, stock numbers and provides the following information on each part: a. Description of the p a r t ( s e e l i s t of abbreviations below). b. Typical manufacturer of the p a r t in a five-digit code; s e e l i s t of manufacturers in appendix. c. Manufacturer's stock number. d. Total quantity used in the instrument (TQ column).

6-3. Miscellaneous p a r t s not indexed in Table 6-1 a r e listed a t the end of the table.

6-4. ORDERING INFORMATION.

6-5. To o r d e r a replacement part, a d d r e s s o r d e r o r inquiry to your n e a r e s t Hewlett-Packard field office.

6 - 6 .

Specify the following informati011 for each part: a . Model and complete s e r i a l nutuber of instrument. b.

Hewlett-Packard stock number. c . Circuit reference designator. d. Description.

6-7. T o o r d e r a p a r t not listed i n tables 6-1 and6-2, give a complete description of the p a r t and include i t s function and location.

A

B

C

=

= assembly motor

= c a p a c i t o r

CR = diode

DL

= delay line

DS = device signaling (lamp)

E

= misc electronic part

A

= amperes

BP = bandpass

BWO = backward wave oscillator

CER

= ceramic

CMO = cabinet mount only

COEF= coefficient

COM

= common

COMP= composition

CONN= connection

CRT

= cathode-ray tube

DEPC- deposited carbon

EIA = Tubes o r transistors meeting Electronic

Industries' Associa- tion standards will normally result in instrument operating within specifications; tubes and transistors

,,,

d.

0 2

-

" o selected lor best performance will be supplied if ordered by .$stock numbers.

ELECT

= electrolytic

ENCAP

= encapsulated

F

= fuse

F L = filter

J

= jack

K

= relay

L

= inductor

REFERENCE DESIGNATORS

M = meter

MP

= mechanical part

P

= plug

Q = transistor

R

= resistor

RT

= thermistor

S

= switch

T

= transformer

GE

GL

GRD

K

LIN

LOG

M

=

= farads fixed

= germanium

= glass

= ground(ed)

= henries

= mercury

= hour($

ABBREVIATIONS

NC = normally closed

N E =

neon

NO

= normally open

NPO

= negative positive zero

(zero temperature coefficient)

NSR = not separately replaceable

IMPG = impregnated

INCD

= incandescent

INS

= insulation

(ed)

=

= linear taper

= logarithmic taper

= kilo

=

1000

meg

=

MTG = mounting

MY

= mylar

6

MA = milliamperes

MINAT = miniature

METFLM= metal film

MFR

= manufacturer

OBD = order by de- s c ription

P = p e a k

P C = printed circuit board

PF = picofarads =

10-

farads

PP = peak- to- peak

PIV = peak inverse voltage

POR

= porcelain

POS

= position(s)

POLY= polystyrene

POT = potentiometer

RECT= rectifier

ROT = rotary

RMS = root- mean- square

RMO = rack mount only

V

W

= vacuum tube, neon bulb, photocell, etc.

= c a b l e

X

= socket

XF = Iuseholder

XDS

= lampholder

Z

= network

S B

= slow-blow

SE = selenium

SECT= section(s)

51

= silicon

SIL = silver

SL = slide

TA

= tantalum

TD

= time delay

TI

= titanium diaxide

TOG = toggle

TOL

= tolerance

TRIM= t r i m m e r

TWT = traveling wave tube

U

= micro = 10

-6

VAC = vacuum

VAR

= variable

W/

= with

W = watts

W W

= wirewound

*

W/O = without

- optimum value selected a t factory, average value shown

(part may be omitted)

Section VI

Table 6-1

C 6

C 7 THRU

C l o o

C l O l

C l l O

C l l l

C 1 1 2

C l l 3

C 1 1 4

C R 1 THRU

C R 4

,

C R 5 AND

C R 6

C R 7

1

C R ~ O

C R l O O

THRU

1

0121-0035

0140-0204

0140-0220

0180-0106

1901-0025

1901-0026

1902-0017

1902-0010

1902-0017

1910-0016

Table 6-1. Reference Designation Index

.-

-.

-

. . .

-

#

ASSY:ETCHED C I R C U I T , INCLUDES:

C 1 THRU C 6 R102, R 1 0 3

C102,C106

C l l O THRU C 1 2 5

R 1 0 5 THRU R l l O

R 1 1 3 THRU R 1 1 6

C R 1 THRU C R 9

C R l O l THRU

~ ~ 1 1 3

R 1 2 5 THRU R 1 4 O

~ 1 4 2

RIG

R 1 5 0 THRU R 1 5 5 L l O l THRU L105

Q l THRU

Q.5

12101 THRU Q l l l d2

THRU R 7 -

Rq THRU R 1 4

R 1 6 7 THRU R 1 7 8

R 1 8 0

SEE O P T I O N 01

C:FXD E L E C T

C:FXD E L E C T

20 U F 50VDCW

100

U F

+100-109

40VDCW

C:FXD CER 0.01 U F 2 s

C:FXD CER

0.47

C :FXD E L E C T

UF

+80-205

25VDCW

10

U F

+100-1M

25VDCW

C:FXD E L E C T

50

U F 25VDCW

NOT ASSIGNED

C :FXD

M

l CA 200 P F

C:FXD M l C A

I.$

3 0 0 V D C V

2100 P F 1% 300VDCW

1

'

C :VAR A I

C :FXD M I C A

7.2-143.7

P F

47

P F

5%

500VDCW

C :FXD M l CA 200 P F l

(

C:FXD E L E C T 60 U F ~ . W C W

1

NOT ASSIGNED

C:FXD CER

C :FXD PoLY

0.47 U F +80-2m 25VDCW

C:FXD E L E C T 10 U F

+100-10&

0.1 U F

2%

50VDCW

25VDCW

C:FXD CER

0.47

U F

+80-209

25VDCW

C:FXD E L E C T

10

U F

+100-1096

25VOCW

C:FXD POLY

C :FXD E L E C T

C:FXD CER

0.1

U F

0.47

U F +80-20$ 25VDCW

C:FXD E L E C T

C:FXD E L E C T

10 U F

2%

50VDCW

+100-10&

25VDCW

50

U F 25VDCW

50

U F ~ ~ V D C W

C :FXD CER

0.47

U F

+80-2M

25VDCW

C :FXD E L E C T 10 U F

C:FXD E L E C T

C :FXD CER

C :FXD POLY

10

U F

+100-1s 25VDCW

0.47

0.1

UF

U F

+80-20$

2%

25VDCW

25VDCW

50VDCW

C :FXD E L E C T 20 U F 50VDCW

1

0 IODE : S I L I C O N

50

MA 1 V

100 P I V

D I ODE :S I I CON

D I O D E :S I L I CON AVALANCHE

1

;

D I 0 D E : S I L I C O N A V A L A N C H E l N ~ l

D

I

L I

1 I

NOT ASS1 GNED i

1

D I O D E :GERMAN I UM 100 MA 1 V 60 P I V

=

See list of abbreviations in introduction to this section

Model 431B

Note

Model 431

B

@

Stock No.

Reference

--7

Table

6-1.

Reference Designation Index (Cont'd)

...

Description

#

DIODE:SIL1CON

D I 0 D E : S I L I C O N

50

MA 1 V 100 P I V

50

MA 1 V 100 P I V

F l

J1

J2

Jl00

J l O l

THRU

L I

L2 THRU

L l 0 0

L l O l

L102

L103 l H R U

D I 0 D E : S I L I C O N

LAMP :NEON NE2H

FUSE :CATR I DGE

0.15

AMP

CONNECTOR :POWER MALE

3

P I N

NOT ASSIGNED

CONNECTOR :FEMALE

6

CONTACT

JACK:TELEPHONE FOR

2

CONNECTOR PLUG

DC C A L I B R A T I O N &SUBSTITUTION, CONSISTS OF:

B

l

ND l

6 l NG POST :RED

INSULATOR :BLACK 2-HOLE I DE)

NSR PART OF 2 1

COIL :VAR

COIL:VAR

2

WINDINGS

2 WINDINGS

9-20

UH EACH

9-20

UH

EACH

METER,CALIBRATED

NSR PART OF W l

NSR PART OF W 1

TRANS I STOR

:GERMAN

l

UM 2 N 1 3 7 0

TRANS I

TRANS ISTOR :GERMANIUM 2 N 1 3 7 0

TRANS I STOR :GERMAN I

urn

2 ~ 1 3 0 4

T R A N S I S T 0 R : S I L I C O I

NOT ASSIGNED

TRANS ISTOR :GERMAN I UM

2N1370

TRANS ISTORtGERMANIUM 2 N 1 3 7 0

TRANS 1 STOR t S l L

l

CON

L

I

TRANS I 2 8 1 3 7 0

TRANS

I

l

UM 2 N 1 3 0 4

:2~3e3

TRANSIST0R:GERMANIUM 2 N 3 8 8 A

R:FXD COMP 3 3 K OHM

R :FXD COMP

1096

1/2W

3 . 3 ~

OHM

10%

1 / 2 ~

R:FXD COMP

390

OHM

R:FXD COMP 1;2K OHM

10%

1 W

1U$ 1W

R r F X D COMP 4.7K OHM

R:FXD COMP

NSR PART OF

270 OHM [email protected]

R t F X D COMP 3.3K

OHM

21

10%

1 / 2 ~

R :FXD COMP

4.7K

OHM

R:FXD COMP 3.3K OHM

1s

1/2W

10%

1/2W

Section V I

Table 6-1

Note

Y

See list of abbreviations in introduction to this section

Section VI

Table 6-1

Table 6-1. Reference Designation Jndex (Cont'd)

$2

Stock No.

I

I

Reference

F

Description

#

R :FXD C O W

.1&K

O W

1096

R:FXD MET

F U

1 0 K OHM

1/2W

1/2W

R:VAR COMP 3.3K OHM

1096

R:FXD MET FLM

4.-

OHM

L I A 1/3W

91

1/2W

R l O l

OPT 10

1

OPT 12

OPT

21-23

OPT 1 0 .

OPT 11;21

1

",'4

OPT 12.22

OPT

13.23

10

/

OPT 11.21

O P T T 2 ; 2 2

OPT

13-25

R 1 0 5

OPT

10

OPT 11,21

OPT 12.22

OPT

13.23

1

R 1 0 6

OPT 10

OPT 11.21

OPT 12.22

OPT

13.23

NOT ASS I

R:FXD DEPC

R:FXD DEPC

R r F X D DEPC 320.1 OHM

R t F X D DEPC

R:FXD DEPC

316

OHM

318.1

329.8

1

OHM s

323.4

OHM 1

OHM

$

1 / 2 ~

I$

1/2W

.

l

1/21

1/2W

R:FXD WY1 200.3 O m

R:FXD WW 200.7 OHM

0.191

0.1s

1 / 4 w l / 4 W

R :FXD

WW

201.5 OHM

0.1% 1/4W

R:FXD

WW

203.3

OHM

0.l$ 1/4W

R :FXD

WW

207.1 OHM 0.1s l / 4 W

R:FXD WW 200.3 O M 0 . s l / 4 ~

R :FXD

WW

202.5 OHM

0.1% 1/4W

R :FXD

WW

206.6 1/4W

R:FXD WW

213.0

OHM

0.15

1/4W

R :FXD

WW

226.3

OHM 0.1s 1/4W

R:FXD

W

189.0 OHM

R:FXD WW

R:FXD

WW

0.19

1 / 4 ~

190.2

OHM 0.1% 1/4W

192.7

OHM O.l$ 1/4W

R:FXD

WW

197.7

OHM 0.l$ 1/4W

R:FXD

WW

208.2 O W

0.1% l/4W

R:FXD

WW

255.0 OHM 0.1% 1/4W

R:FXD

WW

256.0 OHM

RxFXD W 261.4 OHM

0.l$

R:FXD

W

258.0 O W 0 . s 1/4W

0.196

1/4W

1/4W

R:FXD

WW

268.2 OH&! O.l$ 1/4W

R:FXD

W

R :F XD

W

511

OHM

l$

0.08W

887

OHM

1

R:FXD MET FLM 2 2 K OHM

R :FXD

WW

511

OHM

R :VAR CONCENTR l

5%

1/2W

I$

0.08.

FRONT SECT:WW 1 0 K OHM

1M

L I N 2W

REAR SECT:W 800 OHM [email protected]

NOT ASSIGNED

R:FXD COMP 7.5K OHM

R:FXD COMP 3.3K OHM

5%

1/2W

%

1/2W

R:FXD COMP 2.7K OHM

R

:FXD COMP

3.3K

OHM

%

1/2W

1/2W

R:FXD COMP 4 3 0 OHM

R:FXD COMP 3 3 OHM

R:FXD COMP

75

OHM

R:FXD COMP 2 2 0 OHM

R:FXD COMP 1 K OHM

5$

1/4W

9

Y#

Y#

1/4W

1 / 4 ~

5%

1/4W

R:FXD

COMP 2 4 K OHM

R:FXD COMP

910

OHM

R:FXD COMP 2.7K OHM

R:FXD COMP 1 K OHM

5$

R:FXD COMP 1.5K OHM

5%

1/4W

1/4W

5%

1/4W

1/2W

5%

1/2W

L

=

See l i t of abbreviations in introduction to this section

Model

431B

Model

431B

Table 6-1, Reference Designation Index (Cont'd)

I

Description

#

Keierence

Designation

I

R:FXD COMP 7.5K OHM 5%

R:FXD COMP 3.3K OHM

1 / 2 W

4% 1/2W

R :FXD COMP

igk

OHM

yji

i / i w

R:FXD COMP 3.3K OHM 1& 1/2W

R:FXD COMP 560 OHM 1U% 1/2W

R 1 3 2

R 1 3 3

R 1 3 4 THRU

R 1 3 7

R 1 3 8

RzFXD COMP 3.3K

OHM

R:FXD COMP

150

O M

5%

1/2W

1m

1/2W

R :FXD MET FLM 1 K O M 1/2W

R rFXD COMP 1.5K OHM 1 @ 6

l/2W

R :FXD COMP

1 5 ~

RzFXD C O W 1 K OHM i m

!36

1/2w

1/2W

R:FXD COMP 3 9 K OHM 10% 1/2W

R rFXD COMP 1.2K OHM 1Cq6 1/2W

R:FXD COMP 560 OHM 1U% V2W

R 1 5 2

~ 1 5 5

R 1 5 6 THRU

R :FXD COMP

560

OHM

1w

1/2W

R 1 4 4

R 1 4 5 THRU

R 1 4 9

R 1 5 0

R 1 5 1

1

1

0727-0124 o j-oi24

0687-5611

0687-3311

0727-0396

0 7 2 7 4 3 9 7

0727-0398

07274399

0727-0341

'

,

1

1

NOT ASSIGNED

R :FXD DEPC

3920

OHM

R :FXD COUP 3.3K O M

I$

1/2W

10%

1/21

R:FXD DEPC 3K OHM 1% 1/2W

R :FXO DEPC

R:FXD C O W

R :FXD COMP

3~

OHM

560

330

OHM

OHM

101 l/2W

I

I

I

NOT ASS1 GNEO

R:FXD DEPC

R:FXD DEPC

1.194U

OHM

1/a

l/2W

2.m

O M

1/2%

l / 2 W

R:FXD DEPC 3,79K OHM 1/296 l / 2 W

R:FXD DEPC m OHM

l/Z%

l / 2 ~

R:FXD DEPC 1 2 K OHM

i%

i'/%

1m

1/* l / 2 W

1/2W

R:FXD DEPC 21.36K OHM

l/2$

1/2W

R:FXD DEPC 38,051( OHM 1/2% 1/2W

R:FXD DEPC 82.0qK OHM

1/2%

l/2W

R:FXD DEPC 63,14K

OHM

R:FXD DEPC 52.55K OHM

1/8

1/2W

1 / 2 $ 1 / 2 ~

RzFXD DEPC

46.671<

OHM

R zFXD DEPC 41.46K OHM

1/2%

1/a

R:FXD DEPC 52.3K O W 1/2%

1/2W l/2W l./iW

R:FXD DEPC

57.W

OHM

R rFXD DEPC 69.49K OHM

1/* 1/2W

1/2%

1/2PI sa

:L

THRU

S l O l

S l O a

R:FXD DEPC 9 . 2 K OHM 1/* 1/2W

R :FXD DEPC 14215 OHM

1/a

1/2W

R:FXD DEPC 256,8K OHM

R rFXD COMP %K-OHM

R:FXD COMP 5 6 K OHM

1/2% 1 / 2 W

iw-i72wV

10% l / 2 W

R:FXD MET FLM 51K OHM

5%

l/2W

1/2W

SWI TCH r S L I D E

SW

L l NE VOLTAGE

l

TCH :ROTARY POWER

NOT ASSIGNED sw

I

TCH

SW I

DE

MOUNT RES

TCH :ROTARY

RANGE

1 zt

See list of abbtevicrtions in introduction to this section

Section VI

Table 6-1

1

Section VI

Table 6-1

L i Z q

@

Stock

No.

Table 6-1. Reference Designation

Index

(Cont'd)

1

Description

# n

EOOTHRU

T l O l noz

T I 0 3 nor j

1

I

w l

NOT ASSIGNED

TRANSFORUER r AUD I 0

TRANSFORMER zAUD

10

TRANSFORMER rAUD

TRANSFORMER rAUD

i

0

i

0

ASSY,POER CABLE rSMOOTH BLACK, EXTRA LIMP,

7.5

FT. NEMA P L U G I N

FUSEHOLOERrEXTRACTOR POST TYPE

ASSY ,CO I

L r

I

NCLUOES r

L1,

R 8

KNOB r VERN I

KNOB :ZERO

ER

KNOB :POWER* RANGE

M I SCELUREOUS

FOOT ASSY, HALF MOOULE

ASSY ,CABLE

ASSY,POWER

ASSY ,MOUNT RES

THERM

l

STOR MOUNT

SWITCH

SWITCH,

,

NCLUOES r

A117

THRU

~ 1 2 4

R 1 6 0 THRU R 1 6 6 l

l

NCLUOES

I

5 1 0 2

STK. NO. 4318-16A

RETAINER,

I

NO ICATOR L I

HEAT SlNKrTRANSlSTOR

TW D S ~ )

Model 431B

1

Note

#

See list of abbreviations in introduction to

this section

01370-3

Model 431B

Table 6-1. Reference Designation Index (Cont'd)

-

Description

#

OPTION 01

BATTERY, RECHARGEABLE(BT~)

SUPPORT,BATTERY

COVER,BATTERY

RECHARGEABLE BATTERY l

OPTION 02

ASSY,CABCE, SPECIAL PURPOSE INCLUOESz

CONNECTOR,FEMALE

OPTION 10

ASSY, CABLE

20'

THERMISTOR MOUNT FOR USE WITH

HP MODEL 486A OR 478A THERMISTOR MOUNT

OPTION

ASSY, CABLE

50'

THERMISTOR MOUNT FOR USE WITB

HP MODEL 486A THERMISTOR MOUNT

OPTION 12

ASSY, CABLE 100' THERMISTOR MOUNT FOR USE W l TH

HP MOOEL 486A THERMISTOR MOUNT

ASBY, CABLE 200' THERMISTOR MOUNT FOR USE WITH

H?

MODEL

48M

THERMISTOR MOUNT

OPTlOB

2 1

ASSY, CABLE

50'

THERMISTOR

MOUNT FOR

USE

WITH

HP MODEL 478A THERMISTOR MOUNT

OPTION

22

ASSY, CABLE 100' THERMiSTOR MOUNT FOR USE WlTn

HP MODEL 478A THERMISTOR MOUNT

OPTt OM

23

ASSY, CABLE

HP MODEL

200'

THERMISTOR MOUNT FOR USE WtTW

478

A THERMISTOR MOUNT

Section

VI

Table 6-1

Note

#

See list of abbreviations in introduction to this section

6-7

Section

VI

Table 6-2

@

Stock

No.

Model 431B

Table 6-2. Replaceable

Part8

Description

#

Mfr.

CrVAR A I R

C:FXD M I C A

7.2-143.7

P F

47

P F 500VDCW

C rFXD U I C A

C:FXD CER

0.01 UF

C:FXD CER

200

0.47

P F

U F

I$

300VDCW

2096

lOOOVDCW

4+2m

25VDCW

C:FXD MICA

C:FXD ELECT

2100

P F

C:FXD POLY 0.1 U F

20

I$

300VDCW

2$

5OWCW

U F 5 0 W C W

C:FXD ELECT 10 UF

C:FXD ELECT

+100-1m

50

UF 25VDCW

25VDCW

C:FXD ELECT 60 UF

2096

6VDCW

C :FXD ELECT 100 UF

+100-101

1NSULATOR:BLACK P-HOLE I N S I D E )

NSULATOR :BLACK 2-H0LE)OUTS 1 DE)

KN0B:VERN

I

ER

28480

00062

04062

5289

56289

14655

56289

56289

56289

56289

28480

28480

28480

KNOB

:ZERO

KNOB :POWER RANGE

ASSY,

C A B L ~

5'

THEW

ASSY, CABLE INCLUDES

I

STOR MOUNT

1251-0149)

ASSY, c o I L . [ a N s u m s LI,

R8)

SUPPORT BATTERY

COVER. w

I

NG

BATTERY

HARNESS

W l R l N G HARNESS

ASSY. CABLE 20' THERMISTOR MOUNT

ASSY-

CABLE

ASSY:

CABLE

&#

ASSY, CABLE

ASSY, CABLE

100'

100'

ASSY, CABLE

ASSY, CABLE

200'

THERMISTOR MOUNT

486A

200'

THERM ISTOR MOUNT147811 8480

ASSY, POWER SWITCH(1NCL (11,52)4318-1%

ASSY. MOUNT RES SWITCNINCL R101. 5 1 0 1 )

ASSY; RAND SWITCH(INCL R l l 7 T H R U - ~ 1 6 6 )

ASSY. ETCHED C I R C U I T

BOlSO

Mfr.

Part

No.

0121-0035 arl%

47w

O r n l y 2 0 1 F 3 0 0 V

H-1038

5 c U A

C D 2 W 212F

1 1 4 P 1 0 4 2 R 5 S 3

3 0 0 1 9 8 A 1

3 0 0 1 8 2 A 1

[email protected]

15006C6XOOO662

TYPE 4 1 D

0340-0086

0340-0090

03

70-0064

0370-0067

0370-0104

431A-16A

4 3 1 A - 1 6 6

4 3 1 A - 6 0 A

43 l A - 6 4 A

4 3 1 A - 6 4 6

4 3 1 0 - 1 6 A

431EI-16C

4 3 1 8 - 1 6 0

I

TQ

RETAIMR:INDIQATOR L I G H T

R:FXD COMP 1 K OHM

R:FXD COUP

220

OHM

5%

1/4W

%

1/4W

R:FXD COMP 2 4 K OHM

R:FXO C O W 2.v OHM

546

1/4W

596

1 / 4 W

R r F X D COUP 3 3 OHM

R:FXD COMP

R r F X D COMP

R :FXD COMP

5116

V 4 W

430

O W l / 4 W

75

OHM

910

OHM

R:FXD CCMP 1 K OHM

5116

yl6

1/4W

1/4W

5%

1/2W

R r F X D COMP 1.5K OHM

R:FXD COMP

R:FXD COUP

1%

2.3

OHM

R :FXD C W P 3,3K OHM

R:FXD COMP 7.5K OHM

9

576

1/2W

5%

1/2W

5%

1/2W

9

'-OPT1 ONAL

I 1

#

See list of abbreviations in introduction to this section

I

Model 431B

@

Stock No.

0758-0021

O a l l - 0 0 5 1 oall-0063

0811-006$

0811-0065

Section

VI

Table 6-2

Table 6-2. Replaceable Parts (Cont'd)

Description

#

R:PXD COMP 1.2K OHM

R :FXD COMP

R:FXD

COMP

150

OHM 1& 1/2W

1 . 5 ~

109

1/2W

OHM 1% 1/2w

R:FXD COMP

R:FXD COMP 1.8K OHM 1C$ 1/2W

R :FXD COMP

R:FXD COMP

270

330

OHM

OHM

1M

1M

R:FXD COMP 3.3K

OHM 10%

R:FXD COMP 3 3 K OHM 10%

R:FXD COMP 3 9 K O W

1/m

1/2W l / 2 ~

1 / 2 ~

109 l / 2 W

R:FXD COMP 4.7K OHM 10%

R:FXD COMP 560 OHM

R:FXD COMP 5 6 K OHM

1*

1/2W

R:FXD COMP 1.2%

OHM 1%

1W

R:FXD COMP

390

OHM

1M

109

1 / 2 ~

l/2W

1W

R:FXD DEPC 1 K OHM 5 / 2 W

R :FXD DEPC

3920

OHM

R :FXD DEPC 1 2 K OHM

1/2#

R:FXD DEPC 38,051( OHM

1 / 2 ~

1/2W

l/2%

1/2W

R t F X D DEPC 63.14K

O W 1/2$ l / 2 W

R:FXD DEPC 316 OHM

R :FXD DEPC

iiigw

l/2%

0 6 1

R : OHM

1/2W

1/21

1/2%

1/2W

R :FXD OEPC 3.79K OHM

l/2%

1/2W

R t F X O DEPC

R :FXD DEPC

6,nK

OHM

21.3s OHM

R:FXD OEPC 41.46K OHM

R:FXD DEPC 46.6% OHM

1/2$

l/296

l / 2 W

l/2$

1/2W l / 2 W

1/2% 1/2W

R:FXD DEPC 52,3K OHM

1/2%

1/2W

R:FXD DEPC 52.55K OHM

R :FXD DEPC 57.46K OHM

R:FXD DEPC 69.49K OHM

1/2$

1/2W

R:FXD DEPC 82.09K OHM 1/2% 1/2W

R:FXD DEPC 94.2K OHM

1/2% 1/2W

l/2$

1/2W

1/2%

1/2W

R:FXD DEPC 1 4 2 K OHM

R:FXD DEPC

518.1

l/2%

1/21

R:FXD DEPC 256,8K OHM

1 2 %

OHM $1/2W

1/2W

R:FXD DEPC

R IFXD DEPC

320,l O M 1% 1/2w

323,4

OHM

196

1/2W

R:FXD DEPC

329.8

OHM 1% l / 2 W

R:FXD MET FLM 1 K

OHM

R t F X D MET FUll

4.7K

O W

1/2W

%

0.5W

R t F X D MET FLM 1 0 K OHM

R:FXD MET F U I 22K O W

0 W

$W

R:FXD MET

R:FXD WW

R:FXD WW

R:FXD WW

R:FXD

m

FLM

200.3 OHM 0.196 1/4w

189

OHM

0.5%

1/4W

255

OHM

0 . 9

1/4W

511

5 1 ~ ow IS

9

1 / 2 ~

0 . 0 8 ~

DC

DC

I./=

080

DC 1 / 2 C 080

DC 1 / 2 A OBD

DC 1 / 2 A 080

DC 1 / 2 A OBD

DC 1/2A 080

DC d 2 ~

DC 1 / 2 A 080

DC l / 2 A DBD

DC l / 2 A OBD

DC 1 / 2 A 0 8 0

DC 1 / 2 A OBD

DC 1/2A 080

DC 1/2A OBD

DC 1 - / 2 ~

DC 1 / 2 A OBD

DC 1 / 2 A 080

1:

1

2

1

1

1

1

1

1

I

1

1 i

1

07115

05347

05347

05347

99957

0727-0486 c

20 OBD

C

C 20 OBD

C

20 om

20

OBD

C 20 OED

LR 2 0 5 R P 080

L R 2O5RP 080

LR 2 0 5 ~ ~

u3

A 080

'=OPT

l

ONAL la

4

1

1

1

1

2

1

1

2

#

See l i t of abbreviations in introduction to this section

Section VI

Table 6-2

@

Stock No.

Table 6-2. Replaceable

c-

Description

#

--

R:FXD

R t F X D

R:FXD

WW

R:FXD

WW

WW

WW

R:FXD W

887

OHM 1 % 0.08W

201.5 OHM 0-1s l./4w

203.3

O w

0 9 l / 4 w

207.1

OHM

0,s

1/4W

206.6

OHM O.l% 1/4W

Parts

(Cont'd)

Mfr.

R:FXD W

R :FXD WW

R xFXO ww

RxFXD WW

R:FXO

213.0

OHM

0,s

1/4w

226.3 OHM O.l% 1/4W

256.0

O w

0,s 1/4w

261-4 OHM 0,s 1/4W

W 268.2

OHM

0 , s

1/4W

R;FXD WW

R:FXD WW

R:FXD WW

RxFXD W

RxFXD

VIT

190.2

OHM 0 . s 1/41

192.7

O w 0 2 % 1/4W

200.7

OHM

0 . s

1/41

258.0 OHM 0.l%

l / 4 W

202.9

OHM 0 0 s 1 / 4 W

R:FXD WII

R:FXD WW

HEAT S

I

208.2 OHM 0.l% 1/4W

197.7

OHM

BRATEO

0 . s

NX

¶TRANS I STOR

1/41

JACK,TELEPHONE, FOR

2

CONNECTOR PLUG

CONNECTORxPOWER MALE

CONNECTOR :FEMALE

6

FUSEHOLDER :EXTRACTOR POST TYPE

BATTERY,RECHARGEABLE

3

P I

CONTACT

1-25

AH

LAMP :NEON NE2M

TRANS IST0R:GERMANIUM 2 N 3 8 3

TRANS

I

TRANS1 STOR rGEWAN1 UY 2 N 1 3 7 0

2~13b4

Mfr. Part

No.

M3 A OBD

0811-0085

08114086

0811-0087

0811-0088

Model 431B

TRANSISTORxSILICON

L

ICON

DIPDE:SILICOR

DIODE:SILICON

50

MA

1~

D l 0 D E : S l L l C O N AVALANCHE

100

P I V

D I

L

I

ODE :GERMAN I 100 MA 1 V

R:VAR COMP 3.3K OHM

R:VAR W 2SECT 1 0 K / 8 0 0 OHM

FUSE :CARTR I DGE

1N

0.15

AMP

60 P I

V

LllQ 1/3W

1s

2111

SW I TCH :ROTARY ,POWER

SW l TCH :SL l DE MOUNT RES

L l

COVER,

6

X

1

COMR,HALF MODULE(BOTT0M)

B I N D I N G P0ST:BLACK

B I N D I N G P0ST:RED

COVfR,HALF RECESS(T0p)

FOOT ASSY, HALF MODULE

ASSY,POWER CABLE,BLACK

TRANSFORMER :POWER l NDUCTOR tAUD

I 0

TRANSFORMER zAUD I 0

TRANSFORMER :AUDI

COILIVAR

0

2

WINDINGS,

9-20

UH EACH

*=OPTIONA~

I

J

this

section

#

01370-3

Model

431B

Section V I

Table

6-3

T A B L E

6-3.

C O D E LIST O F M A N U F A C T U R E R S

The following code nvrnbsn are from the Federal Supply Code for

Manufadurerr Cataloging Handbooks H4-1 [Name to

Cads] and

H4.2 (Code to Name) and their latest sup Ismants. The date of revirion and the date o f the supplemenk used appear at the bonom of cash pap.. Alphabetical sods* Rave been arbitrarily assigned to rupplierr not appearing in the

Cod.

No.

Y o n u f a c l u r e ~

Addre,.

CoClC U.S.4 Cornmoo

CCI36 YiCoy E l e t l 8 o n ~ r r tP1!3 Sage E1ecllon8cl Colp.

Any r u p ~ l c r r ol U.I.

Younl Hol8y SDII~~I. Pa.

Rochesleo. N.Y.

3 ~ 3 1 4 n ~ . r , a , a ~

30173 Catioik Inr

.

Colton, c a l l $ tlrrl.onmcr P ! o e a l s Ow.

00656 ~ e i e v o , corn

..

I ~ L

~

Camdrn. N.J.

new

a t d l ~ r d .

Harr.

C J l 8 i A11(1611 R M m Colp.

3:8!3 no,me,r, l n p ~ n r r r i n p

Boonlon, N.J

B"lllngl0..

00851 Sanpamr E l e r l l c Co

.

Pmrlmr Oar.

COB66 C o t [npmeelnnp Co.

00891 Call

t .

n o l n e r C o 8 ~ .

01121 Allen B ~ a d l e y Co.

~ 1 2 5 5

LSIID~

Inaust,,es. ~ n t .

01261 TUN Senirorductolr. Inr.

Parbenr. S.C.

L o $ Angeles, C a l ~ l ,

Lo5 L n p l k r . CaId.

WIS.

8 e v u l y nd15, Caln!.

L a r n d a l r . Calil.

C1795 T ? r a r lnrlrunenlr. 1°C.

T ! a n s l r l a P s d u c t r 08..

01149 I h e All.anre YIp. CO.

01589 P a r t l # c Relayl. Int.

01910 Anrcoch COO.

Dallar. Texas

All#asce, Oh10

Van

R o ~ k t o r a , 111.

01961 Pulse Enpone18np Co. S m l a C h a , Cal#l.

Saupe!t#lr. X.Y

02286 Cole Rubbe, and Plasl8cr Inc. Palo AIIo. C1101.

02660 Anphenol.8onp f I t ~ l r o n 6 1 Ch>capo. I l l . and

M~I~IIIIS

011.

02171 VocalmeCo. a1 A n r r % r a . D c .

Old SayblD~k. Conn.

02717 Hopknn5 Enptnetrtng Co. San Felnando, Cal8l.

01508 G.E. S m ~ r o n d u c l o ! Plod. OIDI.

01105 Apex Y I r h t n l

h

T o o l Co.

01191 Elden2 C a p .

S y t a t u l . N.Y.

Dayton, Olio

Conpton. C a l ~ l .

Co..IIC.

Wakel~eld. Ma$%.

C l d a Xnolll. 2.1.

Dl954 Smnget Ca.. Dnrnl Dlr..

Flnderne Plaal

0 ~ 0 0 9 A,,o., mar! and H c p m a o Elect. Co.

H x l l o ~ d . Conn.

04062 E l m m r o Pioducls Co.

04212 nl-Q Drrmrlon o l Aemvor

0 0 5 1 PI~CBIOO P a p , Tube Co.

New Ywk, Y.Y

YycIIe Bea<h. S.C.

Chtcapo. Ill.

CO.

AIl0. CII,!.

04651 S~l.ania EIecIc~c Ploducls.

l c l o . a r e

D l r o r r 01". Yovnlaln Vlr..

04113 Y0101011.

hc..

S l m l C o n d ~ I l O I

CaI8I.

04112 F l l l a n to.. lnc.. W e l a m Ow. C u l w C t h . C ~ I I I .

04711 A u s m a l ~ c E l r c l # # c Co. No!lhlabe. I l l

04196 Sspuo#a **re CO.

04811 P t r c t s m n Corl Sptnns Co.

04818 P.M. Maror Cornany

05006 T.enllelh

Rtd.od CcIy. C a l ~ l . f I Yonle. Calll.

Cenlury Plaltacs. In<.

05211 'Iesllnphoure

05141 Ullron~x. lac.

Younp.ocd. Pa.

Ln

Y a l r e , CIIII.

Sunnyvale. Cslml.

05616

05614

Coslno

Plaslnr

I C ' O

B a m t

E I ~ C I I S C ~ I spec.

C O . ~

CIeveIand. Ohto

Cotman Co.

05128 Tallen O p l l r a l Co.

Ro~k1014, 111.

Roslyn n e l p h l r . Lonp I r l m d . N.Y.

05129 U t l r o T e l C a p .

05183 Slt.a#l Enp8nea80p C r

Plaar.~.,

N.Y.

fanla C l u l . Caltl.

111eI1eId. Y s r r .

06175

Iaurcn

and Lomb DPIITII Co.

06402 C.T.A. Pbsdurlr Co. 01 Ama8Ca

B8ndglpol1, Cenn.

Rochelle!. N.Y.

Chlclpo. Ill.

06415 Wesle#n D t v l t r r Inc.

06540 A n a l m Lleclfonic Hard.ale

B r b a n k . Caltf.

Co..

Bc.

Me* Rochelle, N.Y.

06555 8e.d.

06666 central o e r l c e r to.. ~ n c .

06151 Uurlra8 CVP

*I

Amel8ca

U.S.

Qm<ot

0,".

PnOln,'.

A u r .

06812 Tomnplon Ylp. CO.. 1.11 01,.

Van

N u n . Calml.

06980 E1Iet.!4cCullouph Inc.

01088 Xelran E l e r l r # r Co

I a n Callor. C l l l l .

V a n n u r r . CaI,I. i l l 1 3 C o l l l l n l

61.11

-0411

Eleclmnac Csmpon.nts DID!.

Bladlord. Pa.

01126 D#p$llan Co. P a l m m u , CIIII.

Cod.

No.

Y o n u l o c t u t = .

Addrtrr

Cod.

No.

Y o n u f o c t u r * r

Address

Code

b.

Yonu1octur.r

T l a n s l r l o l Elecllonlc$ Corr. Y ~ n n l a o o l l s . Y l n n

WerllPgnouw Elertr8C

E l e r f l l l n ~ r Tube Dnr.

Clnlh.CIIDhik Co.

Cola.

Elv1r2, N.Y. new

Y O $

N.Y.

CnIy 01 Imdusl~.(. Calil.

Avnal COID. f a t ~ h n l d Cameta

>.,C~nd"<t~l

L o r Angeler. Cal8I.

d

Inrl. Cow.. o i r . YO""lll"

V8t..

C l l l l .

L o r Anpaler. C11d.

T e c h n r a l Wee P ~ o d u r l s lnc. Coanlwd.

n.1.

C a n l ~ n r n l a l D l r a r e COID. Hawtholnr. Calil.

Canada. Ltd. Totoolo. Ontarlo. Canada

General T r a o s ~ r t o l 1 r s l e r n Cow.

TI-TaI. In(.

LO$ A n p r l n . C a l ~ f .

B~I~IIIY,GIIII.

Caraorundum Co.

CTS o l Bemr.lnc.

N18pata Falls. N.Y.

Chlrapo Telephonr 01 Calolornla.

lc.

SO. R s a e e 0 a . Cald.

I a l t M n . Mass.

21226 E m u t o n e . lnc. New Yatk, H.Y.

No. Chmcapo. Ill.

New Bm8la#n. Conn. 21115 Tne F a l n u B e a u n g Co.

7 1 0 5 G.E. Lamp D t v i s ~ a r

Hela P l t k . Cleveland, O h o

24655 G e n u a l Radm Co.

26165 GII~I Reproducel COW.

We11 Concold, Uars.

New Rochtlle. H.Y.

26462 Grobtl F ! r Ca. $1 Aneu~ca. lnc.

26992 Hamalton Walrh Co.

28680 Hewltll-Patk111 CO.

31111 G.E. Recrnr!ng Tube Oepr.

35414 L e ( t l b h n in[.

36196 S l l n w y t k Colt P l o d u r l l Lld. caosladt. N.J.

L a n r a n n . Pa.

Palo Lllo, Caltl.

O*enlDoro. Ky.

Ch~cago. Ill.

11941 P.R. Y l l l l l y 6

Hawhllbuly. Onlaoo. Canada

Co..lnr. Indra~apol8s. Ind.

19541 Y e r h a n 8 ~ a l In d u l l r l l s Plcd. CO. Akron, Dhlo

Semtcondutlst 01".

Shockley Sen8Londuclo!

L a b o r a l o l ~ l ~

Boonton Rae80 Corp.

U.S. Lng6nerrlns Co.

Mountam Vtr-. Calll.

Palo Alto. Cal<l.

R~cha.av. N.I.

Lo5 Angelec. CIIII.

Blinn. Ollbell. CO. Pomonl. C l l t l .

8 u r g e r l 811111y CO.

X~agana f a l l r . O ~ l a t ~ o . Canada

Sloan Company

1ale#bu!y. Conn.

Sun VaIley.Calll. l T T Cannon E l e t l r t c Inr.. Phomox Dlv.

Pnorn#x.

A l v o n a

CBS Etertronsrr Semtronductol

Opcral8onr. Ow. 01 C.B.S..lnc.

UeI,Ra#n

Babrock R e l r y r D l r .

Texas Capacator Co.

E l a l r o AssembI~es. Inc.

La.lll. Mass

CosIa Mesa, CIIrI.

HWIIO.. T e l l s

SUQ

v a ~ t e y . ca18f.

Chmcago. Ill.

42i90 Muter Co.

43990 C.*. norpren Ca.

Ch~cago, Ill.

Lnelewood. Colo.

44653 Ohmite 1118. CI.

47904 Palafo$d Cotp. Cambftepe, Mass.

48620 P c r c s \ o n T h s n o m e t t r

6

Incl. Co.

49956 Raytheon Company

52090 Ra.an C a l , o l l r l Co.

Soulham plon. Pa.

L l x l n p l o n . mass.

W e l l n ~ n l l c l , Yd.

9 9 8 1 Sannorn Co.

54191 sha11cr05s YI~.

CO.

51026 I m p s o n E l a c t l ~ c CO. e l l h a m . Yasr.

Selma. N.C.

C h d a s ~ . Ill.

55933 f o w l m e COW. Elnslo#d. N.Y.

55938 Raytheon Co. Commerraal lippa,atus

h

56131 Spa~ldmnp F l b l e Co..tnc.

So. Nolwall. Cann.

Tonawanda, N.Y.

56289 Spcag~e LIect18c CO.

59446 Telen, lnc.

59130 Thomar

1 4

61175

h

Belt5 Co. l ~ e t .

C

Union s.8tch

North Adanr. Y a r l .

St.PuI. Ylnn.

E I ~ z a b t r h . N.J.

B l u l f l ~ n . Dhzo and S8pnal. 0,". of

P~ttsbolgh. PI.

OVOIW. Ynch.

63141 1 1 1 6 L l a n l l d EIKIIIC CO.

61959 Nextern Eltctr,r Co..lnc.

MI. Velnon. N.Y.

N.Y.

65092 W r r l o n b l . Dl*. o l Dantfom. In<.

66295 1 1 l t e k Ulp. Cs.

nt.arw,

N.J.

Chicago.

Ill.

D v n r r n E l e r l r s n ~ c s 1°C. Corla Mesa. Calll.

G t n a a l In.il~ument Corp.. smnconduclo# Oiv..

Pfodu<tr Croup Newatk. 1.1.

Impe1111 EI~LIIo~Ic, lbr.

Y I I a b I .

1°C.

Ph#ladelph#a n a M t r Co.

Bwna Park. C ~ I I I .

Pa10 Allo. C211l.

Camdrn, N.J.

Dovec. N.H.

Tokro. Iaoan

Clark, N.J.

Oella S e n l r o n d ~ r l o l ll c . Ne.po11

T h u m o l l o y

T r l e l u n r r n IG.M.B.n.1

Beach. C1111.

Dallas, Texas

H a n o v s . Camany

Ybdl~nd.111phl D w . 01 P l r i l t r I n d u l t t l l l . 1°C.

YI~. co.

10216 I l ' m MIS. Co.

7 0 x 9 A l l m Ylp. Co. l o l l 8 Allmetal S c I t v P l o d u t l Co. Inc. n.

P ~ I .

Harllord. Cono. narll01d. Conn.

Garetn COI~, 8.7. s e m i e t h

CIIII. Reslsloi COIP. sanla Y o n ~ s . CIIII.

He.IeIl~Pa~ka~d Company

1 > l l t a m s Mlp. Co.

Lortlan6,Colo.

Newark. N.J.

Jo3e.

C a l ~ l . r e a s l a Elrclvonrcs Co.

Ameba

mc.

New Yorh, N.Y.

N.HOII~.OO~. caI11.

U8cron EI~~IIOPICI c a r a t n Cdy. ~

T r e n t l l t n Ctnlurf

Colt Sprtnp Co.

~ n g fanla C l a ~ a . CaItI.

Yt. Vte.. C a l ~ l .

YcCaa.-Ednron Co.

Spcuce Plnc Y t r a Co.

Long Island CDIY, N.Y.

Spcuce

Pine.

N.C.

Computer Olode Covp.

Ideal P#ec. Y e l n Co..

De Jur Y t l r r Olr.

OIICO

Raato 0,". 01

C.Y.

Is. coca.

Loen. N.J.

~ o k o n o . ~nd.

Campa Pank, Ca181.

Tuanrr Company Yovnlamn Vlr.. CaItI.

TY.CII ulg. CO.,I.T.

C u # l # $ !nrtlumenl. Inc.

E.I. OuPonl and Co..l*c.

T h e Bend<. COIP.. fclrp%e.P~onee~ Dnr.

H o l l ~ s l o n , M a s .

01s P 1 1 1 ~ 1 . 111.

MI. Kmtco. I.I.

I t l n l n p t m . Del.

Teletnom. N.J.

Thomas A. Ealron I n d u r l l , n . onr. of Ucc~a..~e~ran co. w e r l omnge. N.J.

Elerl!a Ylp. Cs. I n d e p n d r n r r . K a n l r r

10563 A r w r l l r Co..lnr.

70901 B d b m Ulg. Co.

10998

Blld

Elert!onmr CUP. l I O 0 2 8 ~ 1 n D a t h Radlo Co.

Unnm

Ctty.

Chltapo,

I.

J.

Ill.

C l e r t l l n d . Ohlo new Yoxk. N.Y.

71041 B o l t o n C e l l 1011s D l l . 01 wutcay Co. o l r e z a l

11218 Bud

Radio.

1°C.

Qunncy.

Y l l r .

r l l t o u g h b . Ohlo

11286 Camlsc Fasl.oe~ Colp. Pacnmus, #.I.

11313 C8ld.cll C o n d e n r a Colp. L l r d r n b u r l l L.I., N.Y.

11400 B u r r n a n n Yle. 08.. o l

YcCrav.Ed8lon Co.

71416 chtcapo C o n d l n r r r Cow.

11441 C a l l l . Sprlnp Co..ln<.

$1. LOUIS. YO.

Chtcapo. 111.

P#cc.Rwtra. Caltl.

11450 CTSCorp. El&ha#t, lnd,

11468 ITT Cannon Elerltnr IN. L o % Anzeles. CaItI.

B u l b l n l i Ca(lf.

1 1 0 2 C.P. Clare

l

CO.

11590 C l n t l l l l b Drr. 01 Globe

Unto0

In<. chtcapo. Ill.

WII.

11616 ConnlCT1II PI~III<I CO.

71700 T h e C w n s h

lcrr

Co.

ChlCgO. 111.

Nt. Yml. N. Y.

Chtcrpo. Ill.

71151 A.O.s.,lhcorp..Cto.l." o n . v e s t Dranse.

71185 C m h YIg. Co.. n o w r l d 8.

Jones

D l r .

N.J.

11701 Colo Cot1 Co..Int.

Dllamanltc. Conn.

P l e r ~ o n c e . R.I.

72351 John E. F a s t Co..

Dir.

V t r l o a e n I n l t l . Co.

7httapo. Ill.

Address

Hugh H. Eby I n r

Cudeman Co. Chcago,

Ill.

Robell

Erie u. nadlcy Co. LO$ A n t e ~ e s , C~ISI.

T r r n n o l o p ~ r a l Pradurlr. In<. E#lr, pa.

H r n r r n Mlg. Ca., lnc.

H.Y.

Halpe!

CO.

H e l l p o l Ow. 81 h r k m a n

Bn..

lnc.

FYIIIIIo..

Pr8nrelon. Ine.

Ch8caeo. Ill.

C8111.

Hughes P ! o d u c l ~ Dmv~ston 01

Hughes A l i c l a l l Co. Ne.po#t

Beach,

Cal11.

AmDeleX E l t r U o n a c Ca.. Dnr. 01 h ! l h

A m l l r m PlllllP, CO., 1°C. nltit.,ll..

n .

Bladley Sen~condurlo! Colp. Hamean. Conn.

H1111014. Cmn.

C l o l g e K. C a l l r l l Ca.. 04..

I n d u l l l l l $ InC.

Federal S c m P l o d u c n Inc.

Fas~he, SLCIII H s . Co.

The General lndurllles Co.

Corhen Slamptng

l

Tool Co.

J F D E l e c l l o n l r s Gorp.

Jrnnnngr Radm Ylp. Cotp.

J.H. 11nnr. and

Son5

P h l l l d e l p h , ~ Pa.

Chxago. 111.

C P O O ~ ~ I I , Ohlo

EIy#,a. Ohm

Goshm, lnd.

B r o o k l ~ n , N.Y.

San Jose, Caltl.

R e p I ~ n e . Y.J.

Itocher*,. u a s r

Chnrago. I l l .

E.F. Johnson Co.

Ombury. Conn. waseca, U,"".

James

K n l g h l l Co.

Kulka E l r t l ( t c Cdpo,alzon

Lenz Lleclt4c Ylp. Co.

L~tl1el"se. 1%.

C.1. Y a i w d e l

Samdw<ch. Ill.

MI. Vsnan. N.Y.

Chtcago. Ill, o e s Pla,"es. Ill.

EUI. pa.

I a n F f m c ~ s r o . Calm!.

Y t r a n o l d

~1.11

O w .

Millen me.

CO..I~C.

J.1. Y I I I ~ I Ca.

Yonadnock Y l l l l h r l l e r EleclIlC Cs.

Newark, N.J.

Yaiden. Yass.

L o s Aflpele%, CaI8l.

ian

Llandlo. C a l l .

Cleveland, Ohlo

C!ysIal Lakt.111.

The B."d,, Colp.

Bee611 P~CIIIC 011.

NO.

Holly.ood, Calrl.

Phanelllan I n l t r u m r n l and

E l e c t l o n r Cs. south P11aana. cal,l.

R # l a d l l D n l d Stet1 and 18lr Colo.

P h l l a d t l p t a . Pa.

Aner>can Yafhdne 6 Foundry Co.

Psller

d

B,umlmrld D a . P ! ~ n r r l o n . lad.

T R 1 Ekctron6c C m p o n n t r 01". Canden, N.1.

Gorp., Rtclol~e, DIV.

Re$~stance PrducI, CO.

Rubberrrall COID. 01 CIIII. s h a k l p l l o l 01*,,10..1 l l l l " ~ l ,

T o o l l o l k l

5ipnal lndnratol Cwp.

Saascr.Ounn Inc.

Thompson-88rn.l

6

Co.

BcookIyo. N.Y.

Ha,!~sbu~p, PI.

Tmrance. Caltl,

Elgts. Ill.

Nem Ioak, N.Y.

Pflman. N.I.

C h ~ c & ~ o . l l l .

Ssn F # a n c ~ s c o . Calil.

Starkoolr C a l b m Co.

Slandald Tholnron C o w

T ~ m c r m r n Prcducls. Inc.

T ~ a n r l e # n r , Esplneerr

1 a l l h m . Mass.

Clrveland. Ohlo

Sari 6161111, CIIII.

U c t w I e CO.

Waldel Koh8nool Inr. v e l d e l Rool. l n r .

1 e n c o Ute. c o .

L n p lrland Clfy, N.Y.

H a ~ t l s r d . Conm.

Chtcano. Ill.

Pnllaeelpa~a. PI.

It.

Y e p r o 08r8raon 01 Sers8snr

Clock Co.

S c h n ~ l l r El8rlbeth. N 1.

TI~II TlllphOlO Equlpmlnl Nt. York. N.Y.

Tub+ meet8np ELL slandards-lehonplon. D.C.

Un,aar

S.atch,

D'r.

Yaron

E l t c l t o n t r r Colp.

Untled Tranrlotnez Co80 New Yook. N.Y.

Chtcapo, Ill. Oxford E l m t r l c Cap.

Bourns Llblalo!ser. Inc.

R I C I I P I .

C o n ~ o l , CO.

A l l S t r l P 8 d c l r Int.

I l a l l s l o l o . Ohlo

Oelsance. Ohio

Yonierla, CIIII.

Fmm: FSC. HanoPoor fupplsnenl% nc.1 Dated

DECEMBER

1964

H4.2 D a l M MARCH 1962

Section

VI

Table

6-3

Model

431B

TABLE 6-3.

CODE LIST OF MANUFACTURERS (Continued)

Code

NO.

M o n u l o c t u i c r

Address

Code

No M m u l o c l u r e r

Address

Code

No.

M o n u i o c t v r t r

0 : 5 t j

Hnn-8

i ~ # l u l ~ d

4

S !

A

L ' i .

C I .

;I;:: IPlel~laItcnal I n r l r u l ~ l e n l r 1°C.

% G i I Goaybo ; CS.

::%5

Trjao 11ansl;rrcr Cot;. v e x Y:!k, N.Y.

B ~ 1 1 5 n . Mass.

Ola8lgc. Can?.

LaGra8>gc, I l l .

V a ? . r e .

Calll. b:l;7 W m r n r r l r . Ller:no;lc> Co..

I"<

Notwalk. Cald.

t . 3

u # l , l a r , s ~ c c ~ t ~ < a l ~ o n

. .

.

.

.

. .

<]I:$ C I e v ~ l a n d . Ohm

:I;$!

;,.,.

CLII,.

I'

.,.,

T l e A

!pax

P ! N u c t r Cc. Carb88dge.

Mars.

: I .

( !

!

b l i b l Barry I:Y?~ILI. O r . BLIIV I l l l g h l Cocv. w11111:111.

.;Il:ai

Carlt, P ~ e c E l e t l ! , ~ Co.

VIII.

S k o ~ e . l!l.

16crll : ~ t a d r v oc.. Cccpc! n c * l l l t l c c l ! t c 08". H o b k e r ,

D

I Y . I . C ~

51

I c e e l Cal?ea Cb. 06 821s.

N.J.

Pa.

3211: Ilirch '0 Ca#,e#a Inrl. C3ln..

Plod. Olvlr:on

Sir3

Yagus,.. lhOurl#!er, Inc. i?2!9 S ~ l v a n E:CCIIIC PG<. I88r.

G l e e t w c h . Conn

E ~ ~ t l t o n ~ ~ c

vis8e8l

6211%

A S I ~

EIIDOIIY~. Pa.

Earl

Newark. N.J.

52339 S w t r h ( a l l , Inc. a764: U c l a l r 6 C o n l ~ o l r

Spenrei P l ? d u r l s

82166 Phc'l4p;-Advance C ~ n l l o l

82166 Re101r:h P I M Y c I ~ COID.

22611 ROlrJn MI!. CU.. lnc.

C~CISC. I l l .

1111Itbo~o. Wass.

J L I I ~ I . I l l .

M0110n.

Wlr.

W3ccrloc*. 11.1

67391 Vcrlas LletIrsn8c

Co.

Cleldale. C a l l l .

9 3 8 8

CJII

F . t r l e w ~

131

A n g e e r . C a l l l .

Ca*br#dge. Y a r r .

& I 3 2 5 Ne* H,:norh,fe B a l l B r a ~ l n g . Inr.

83125 C c l l r l a l l l ~ r t r v n c n l Carp..

;?Ira

Lji3:; c:!ES

C a p * c I o r Ow.

T T wr,c an0 C a w 0,".

11218 Bend,. C o w , Red Bank 0,".

13315 Htldbel C o l ~ .

S* ~ h .

Cm!ra

See*

CJ.

I-c.

L355; Gavtll * # r e a:ld Cdhle Co.

ON. 01 A n e l a t e COID. i i 5 9 1 BI;I~OUEI.I COIp.

'

OalLngIon. 5.C. l o r Angeles. Ca'lt.

S p l l l g l # e l d . N.J.

Red Bans. N.J.

I l o n d e l e ~ n . 111.

B ~ o o * l y n , N . I .

C h ~ a g o . Ill.

Brookf8tla.

M a s .

P~a8riI8etd.

%.J.

PI:(:,

LIer!at>nc Tube Ow.

E v e ~ e a l y Ow. Nat~a81a' Carbon

O v .

Ulqlon

Carbade COID. New Yen*. N.Y.

'd!:71 node! Eng. alld Ulg., lor. n u n l o g t a r , Ill5

8!6?1 l g y d Sc8oggr C3.

U!96 A.J. Clcsenel Co.. I r r .

11411 TRW Cspnc8lcl 0.".

31912 S a l h r l T a l l an.

lo<.

55454 aeonton xc.alng c c n p a n y

Sat,

C v n .

be

...

M .

N.Y

F : a n r , l r . .

:a

I.

388'

a r, Nr:.

BI?:,?, ngl:., ~ 8 .

ecc..:.

,,, h :.

85411 4.0. Bevc Cc.

65474 R M. Braran.mlr XCo.

85661 Kolled

Ka8fr.

Inr.

8591: S e m l e $ l Ru3Qc: CO.

San F,ani r r r , Call'.

San Frantlsc:. CI

I,.

Ha-\.den. C3lln.

C h c a s c . 11.

66191 C I * I I ~

P - ~ C O S . ~ ~

CO,.

IOC.

C1.1:on neigh!r. Pa.

16519 Poec8s1on Rubber P l r n u r l r COIC Olvton. 0%:

36681 RadlO C o l e o l A m c c a , L l a ~ t i o n ~ ~

C o r p .

f

O e r c e l Ow.

HIIIIIC",

63216 P h i

t i

. L a n r d a l e 0 v,xt,n.

N.1.

8;4:3

Ld.lld.~IC, Pa.

Western Flbrour G l a r r P : l d u t l r Cc.

Ssn F!anc#rcc, CaIsI. l i 6 6 a Van walers S Rogers lnc. la., i ! a r c l s r c , Ca:.!.

8193C Towel MIe. Colp.

P I O V I ~ O ~ ( C .

R . I .

81110 Culla.namrret, lsc.

38221. Could-Nallonal BatIe~8e1. In<.

(8411 r e o e i l l Telephone

38698 Geneial YiIIs. IIK.

~ , n m l n , 111,

11. Paul. I A m .

6

R a d a Cofp. C l ~ I l o n . N.J.

Bullalc, N.Y.

O ~ L l a n d . Cal81.

89411 Genera! E l e t : r ~ c D8slrlbuttnp Colp.

S l h e l ~ e ~ ! a d y . N.Y.

Co,'aeo. 1W.

9Ci19 US Rubbe, Co.. Consume! loa.

S

P l a s t . ' ~

PIC#.

D ~ V .

Pas111c. N.J.

90913 Bra,j!lg E n g l n r t r l n g Co. San F l a n r 8 r t c . Ca'll.

912% Connbm Spt.ns Yfg.

9;345

M l l l e i

D.21

Co. San F8anc8rco. Ca: f.

1

Co.

E l LIYOIC. C l l i l .

91118 Rad,: Yaleraal5 Ca.

9 i 5 0 6 Arwal lnr.

91637 Oale Elerloan6'~. In<.

Ch8rago. Ill.

Allleboio. Mars.

C o h n b u s . Neal.

91%2

E!re

Cws.

91133 CICCII YIP. C1.. In'. w8llow Clove. P a

W a t e l ~ e l d ,

l a r r .

91827 K F Derelapment Ca. Rpd.ood

91979 Honeywell Inr., Mlc,o Swilch Olv

Clly, Calnl.

91961 Nahn-Blar. Spllng Co.

9 2 3 b l Elgee1 0011ral Co.. Ihc.

9219b Unwe!ral I n a u r t r # e r . lnc.

926:7

Oakland. C a l l l ,

Peabody.

U a r r .

R e t h r r l e $ . N.Y.

I n d u r l l y . Calal.

Ta!#ytow#), N.Y.

93132 Sy1van.a E l r c ! b c Ptad. Inc.

Sorlzcaldvcler

D l v .

Address

Cede

No.

M a n u f a c t u r e r

Rcbbonl 2nd Myens. ~ n c .

S l r v e n r Ylg. Ce.. lnc.

H o l a r d 1. Smllh 1°C.

G.V. C o n l l o l r

Genela Cable COID.

R l v l h c a n Co., Con,.

Manrl8eld. Ohlo

Port Monn~outh. N.J.

Llv8ngslon.

Bayonne.

N.J.

N.J.

Ow..

104. Corn:. Llperaltonr Qutnry. Marr.

S(1e11111c E l e < l r o n t < r Ploduclr. Inc.

Tcng-Sol E'crtnlc, lnc.

Culliss.w#tghl Corp. e c l c 0 .

South C~IIIPI Cerp.

Loveland. Colo.

Nr*a!k.

E a r l Palelran.

N.J.

N.J.

T'81-Chrn P#Ddrc:r

Men.csr

C5nponentr Ow.

George A. PhIbie(. RCIPIIC~PIS,

Hvnlinglan, L 6 .

W o l c e r l c ~ P t t s r e C Alunrnum Corp.

BtlI1OOd. 111.

WOI~CII~I. bc.

Mass.

Bartan. Mass.

Ulaml, Fla.

Canl*,enta! Connetlor Corp.

L e e c r a l l Mlt. CO.. Int.

L c r m L l e ~ l t o n c r r . In<.

National Colt Co.

Vtramon. lor.

G o r d o J C o ~ o .

Mtlhoae hUg. CP.

Oage E l e r l r \ c Co.. In<.

Wcrkcsrer Co.

HuD88nr l a a o l a l o l l e r

Long Island,

N . r

Bulbank.

Cald.

Sholtdao, Wye.

BII~KPDOI~. Con".

Blooml#eld, N.J.

C h ~ r a g o . I l l .

Frankl8n. Ind.

Ch8rago. Ill. suenyvale. Calll.

HI-Q Dl". 11 APIOYOI

Tholddrson.Ue,ssne~

YaKulre I n l u r l l ! e l . Ic.

Solat U a n u l a c l u i ~ n g Co.

C a l l l o n $clew CO.

COIP.

Ow.

0 1

Olean, N.Y.

MI. C a m e l . I l l .

L o r Angelcr. Calil.

C h ~ a g o . Ill.

Ll8Crobare Ar%oroaler, In<. Bull8nglon.

Marr.

f l r e l TIIISIW~LI

Sealeclla Calp.

Calaa Corp.

CO.

Rubber Teck. Inr.

Francts L. Y o r e l e y

Oakland. Calll.

Iru!ngton. N.J.

A u l m a I ~ c 8 PIC'IIIEII

Reon R e r ~ s l e r Carp.

Y18.

Yonkers. N.Y.

L l l l m l y r l e m lor.. Adlel-Weltllc

Cemmun. Ow. New Rarhelle. N.Y.

R.Tron<ls. Inc. 18m11ca. N.Y.

Caldera. Calll.

Pasadma. C a l ~ l .

So. P a r a a m a . Calbl.

Yama~onech. I.Y.

Redwood Coly. Calnl.

EleCltos8cs Dlv. MIIII)CJDO~II,

IIIP:..

Glen C o r r . N.Y

01 A n r r 8 r a

Oeleuan EICIIIIIIIII

Wllro Cor#wialll,*

Renbrandt. lior.

COID.

Sala

M ~ i l i n ; . C n l I.

L I SOSYIIUY. C.11.1

Ed51 A..1,.11.

N.?.

In8,,>#,.?#<1'#5, wd.

Bisl.,".

M.lrr.

T H E FOLLOWING n.r

V ~ N D O H S H A V ~

'I,I:'.

B E 4 ASSIGNED I N T H E l A T E S T S I I Y Y L E V E N I

T;

THE F E D E R A L SUPPLY CODE TDR S A N l i i A C -

TURERS HANDBOOK.

M M F Y a l < o T o o l azcd

Dte

A,tgeler.

Cai,'.

OOOOM W e r l e l n Co8 Dlv. 01 A , ~ l o n ~ n l , i

~na..

I N ~ C .

Red*ooa CSI,.

c.1

*.

OOOOZ WlllOW L L l l l i D l PIO~YLII COIU.

0 0 0 1 4 Blatarh Radoo L l e c i f o ~ u c r Lto.

N e l , l l & .

Y.J.

OOOAB E T A

OOOAK Slenienr-Amr88ta is,<:,,

.

ubttc

Pla,o<, h

,

D o 0 8 8

OWYY

S.K.

Sll##ln Ca.

V,?r, N t w ,

~,jl,:.

WOMY Rubbei Eng.

OODNN A

"N"

8

O t r e l a o t r r ~ ~ ~ I

0 Mln. Ca. 8411 Jar?.

C i l

-

OOOQQ CooIl~or8

OMS8 fil8lii

1

111 11611, W ~ I C I ,

OOWW C I l a l o ~ n 8 a E s r l e o Lab.

02Ala~te. t , ! l '

0,:<1,,41,,

1 0 s Ang?lvs,

C.!I

',

5CGiS.dG

REV

re<:

May.

;961

:Vn.e,tlr

Dale5 O t C t Y B l R I

Model 431B

Appendix

APPENDIX

MANUAL CHANGES

This manual describes directly instruments with serial prefix 451

-.

For other serials, change the manual a s indicated below. If your serial prefix does not appear either here o r on a change sheet supplied with the manual, the correct information can be obtained from your nearest Hewlett-Packard Field Office (see lists on following pages).

Serial Prefix 432-:

Table 1-1: Change Zero Carry-Over to read, "Less than 1% of full scale when zeroed on most sensitive range.

"

Paragraph 1-3, last sentence: change to read, ranges.

".

.

.within

i

1 % for all higher power

Paragraph 3-2, second sentence: change to read, of full scale.

. . .

"

".

.

.from range to range within +l%

Figure 3-2, item 8, Note: change to read, "Zero-set accuracy of 1%

."

Paragraph 5-74c: Change last sentence to read, "The zero must c a r r y over from range to range within +l%

Serial Prefix 221, 223, and 301:

Make above changes plus:

Figure 5-3, Q106: Change type to 1854-0003.

Table 6-1, Q106: Change hp Stock No. to 1854-0003.

Table 6-2, 1854-0003: Change T Q to 3,

1854-0045: Delete

Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement