431 Power Meter 233

431 Power Meter 233
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OPERATING AND SERVICE MANUAL
MODEL 4318
SERIALS PREFIXED: 233-
POWER METER
Copyright
ISOI PAGE
01370·1
MILL
HEWlETT.PACKARD COMPANY
ROAD, PALO ALTO, CALIfORNIA,
1962
U.S.A.
Printed: DEC 1962
Model 431B
Table of Contents
TABLE OF CONTENTS
Page
1-1
1-1
1-2
1-2
1-2
Section
I
GENERAL INFORMATION . .
1-1. Description....
1-6. Accessories . . . . .
1-8. Instruments with Options
1-10. Instrument Identification
Section
4-25.
4-31.
4-33.
4-36.
V
IT
INSTALLATION .
2-1. Inspection
2-3. Installation
2-5. Rack Mounting
2-9.
Three-Conductor Power Cable
2-12. Primary Power Requirements
2-15.
Initial Battery Operation Check
2-17.
Repackaging for Shipment
2-1
2-1
2-1
2-1
2-2
2-2
2-3
2-3
OPERATION
3-1. Introduction.
3-3. Mechanical Adjustment of
Meter Zero
Controls and Indicators
3-5.
3-7. Operating Instructions
3-9. Battery Operation
Battery Charging Times
3-11.
Battery Charge Check
3-13.
3-15. Major Sources of Error, Microwave
Power Measurements
3-17. Power Meter Accuracy of 1% or
Greater Using the DC Substitution
Method
3-21. Equipment Used for DC Substitution
3-24. Additional Applications
3-1
3-1
..
.
ill
..
.
IV
THEORY OF OPERATION
4-1. Overall Description
4-6. Circuit Description
RF Bridge Circuit
4-7.
Metering Bridge Circuit
4-12.
Synchronous Detector
4-17.
Differential Amplifier Q104/Q105
4-21.
Feedback Current Generator Q107
4-23.
.
ii
3-1
3-1
3-1
3-1
3-1
3-1
3-1
3-5
3-5
3-5
4-1
4-1
4-1
4-1
Meter Circuit . . . . . . . .
DC Calibration and Substitution
Regulated Power Supply. .
Power Switch . . . . .
Page
4-4
4-4
4-4
4-5
.
MAINTENANCE
5-1
. 5-1
5-1. Introduction
5-4.
Cover Removal and Replacement.
5-1
5-6.
Top Cover Removal
5-1
5-7.
Top Cover Replacement .
5-1
5-8.
Bottom Cover Removal
5-2
5-9.
Bottom Cover Replacement
5-2
5-10.
Side Cover Removal
5-3
5-12. Test Equipment
5-3
5-14. Troubleshooting
5-3
5-17.
The Power Supply
5-3
5-21.
10-KC Oscillator-Amplifier Check 5-4
10-KC Amplifier Check .
5-27.
5-7
5-32.
Metering and Feedback Circuit.
5-7
Squaring Circuit Checks.
5-34.
5-7
5-40. Battery and Charging Checks
5-7
5-42.
Battery Check
5-7
Charging Checks
5-45.
5-8
Battery Warranty.
5-50.
5-8
5-52. Repair
5-8
5-54. Mechanical Adjustment of
Meter Zero
5-8
5-9
5-56. Adjustments .
Power Supply Adjustments
5-9
5-57.
Oscillator Frequency Adjustment 5-9
5-58.
Coarse Null Adjustment .
5-9
5-63.
Zero and Vernier Control
5-69.
Adjustment .
5-10
Full Scale Accuracy Adjustment 5-10
5-70.
5-10
5-71. Performance Check
5-10
Zero Carry-Over Check
5-74.
Calibration and Range Tracking
5-75.
5-11
Accuracy
.
.
~4-2
4-2
4-3
4-3
VI REPLACEABLE PARTS
6-1. Introduction .
6-4. Ordering Information .
6-1
6-1
6-1
01370-1
Model 431B
List of Illustrations and Tables
LIST OF ILLUSTRATIONS
Number
Title
1-1. Model 431B Power Meter.
Page
1-0
2-1. The Combining Case •
2-2. Steps to Place Instrument into
Combining Case
2-3. Adapter Frame Instrument Combinations.
2-4. Two Half Module in Rack Adapter
2-5. Repackaging for Shipment
.
3-1. Front and Rear Panel Controls and
Indicators.
3-2. Turn-On and Nulling Procedure •
3-3. DC Substitution Technique
3-4. Permanent Record
3-5. Increased Resolution.
3-6. Leveler Setup .
3-7. Monitor Control Systems .
3-8. Determining Insertion Loss or Gain .
. .
2-1
2-2
2-2
2-3
2-3
3-2
3-3
3-4
3-5
3-6
3-6
3-7
3-7
Number
Title
4-1. Block Diagram . . . • .
4-2. RF Circuit
. . . .
4-3. Metering Bridge Circuit . . • .
4-4. Nulling Circuit
4-5. Synchronous Detector. .
4-6. Differential Amplifier
•
4-7. Feedback· Current Generator . .
4-8. Meter Circuit . . • . . • . .
4-9. DC Calibration and Substitution .
4-10. Regulated Power Supply. .
4-11. Power Switch Arrangement . . .
5-1.
5-2.
5-3.
5-4.
Cover Removal • . . .
Top View
.
Power Meter Assembly.
Power Supply . . . . . .
.
. . .
. . •
. • .
Page
4-0
4-1
4-2
4-2
4-3
4-3
4-3
4-4
4-4
4-5
4-5
5-0
5-6
5-13
5-14
LIST OF TABLES
Number
Title
1-1. Specifications
1-2. Model 431B Thermistor Mounts·
3 -1. Voltmeter Readout to Power Multipliers.
Page
1-1
1-2
3-6
5-1.
5-2.
5-3.
5-4.
5-5.
Test Equipment . . . . . . . • .
5-1
Troubleshooting. . • . . . . .
5-3
Power Supply DC Voltage Checks . • . . 5-5
Power Supply Ripple Checks . .
5-5
10-kc Oscillator-Amplifier DC Voltage
Checks . . . . . • . . • • . . .
5-5
5-6. 10-kc Amplifier DC Voltage Checks . • . 5-5
5-7. DC Voltages in Squaring Circuit. . . . . 5-5
5-8. Data for Calibration, Tracking Accuracy
Check. • • . . . . • • . .
5-11
6-1. Reference Designation Index
6-2. Replaceable Parts . . . . .
01370-1
6-2
6-10
iii
Section I
Paragraphs 1-1 to 1-4
Model 431B
SECTION I
GENERAL INFORMATION
I
1-1. DESCRIPTION.
1-2. The ~ Model 431BPower Meter, with~temper­
ature compensated thermistor mounts, measures rf
power from 10 microwatts (-20 dbm) to 10 milliwatts
(+10 dbm) in the 10-mc to 40-gc frequency range.
Direct reading accuracy of the instrument is ±3% of
full scale. Instrument specifications are given in
table 1-1.
1-3. The design of the Model 431Banditsthermistor
mount, results in almost complete freedom from
measurement error caused by ambient temperature
changes.
The instrument incorporates two selfbalancing bridges with one arm of each bridge being
a thermistor. The two matched thermistors, both
located within the mount, are thermally coupled, but
electrically isolated. One thermistor is used to
absorb rf power; the other is used to provide temperature compensation. Thus, the thermal 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 range is maintained within 1% for all higher
power ranges.
1-4. The temperature compensated
thermistor
mounts used with the instrument are specifically designed for ~ Model 431A/B Power Meters. Coaxial
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 compensated mounts
Power Ranges:
7 ranges with full scale readings of 10, 30, 100
and 300 J.L w; 1, 3 and 10 mw. Also calibrated in
dbm from -20 to +10.
External Bolometer:
Temperature- compensated thermistor mounts
required for operation (~ 478A and 486A series).
Accuracy:
±3% of full scale from +20°C to+35°C, ±5% of full
scale from O°C to +55°C
Zero Carry-Over:
Less than 1% of full scale when zeroed on most
sensitive range
Recorder/Voltmeter Output:
Phone jack on rear with 1 ma maximum into 1000
ohms ±10%; one side grounded
Calibration Input:
Binding posts on rear for calibration of bridge with
~ 8402A Power Meter Calibrator or precise dc
standards
Power Supply:
115 or 230 volts ±10%, 50 to 1000 cps, 2-1/2 watts
Weight:
Net 8 lb (3.63 kg) with cover and cables 11-1/2 lb
(5.44 kg) including battery; shipping approx. 13lb
(5.9 kg)
Accessories Furnished:
5 ft (1. 5 m) cable for ~ temperature-compensated
thermistor mounts. 7-1/2 ft (2.3 m) power cable,
NEMA plug.
Accessories Available:
431A-95A Rechargeable Battery Pack for field
installation.
~ Models 478A and 486A Thermistor Mounts
~
Model 8402A Power Meter Calibrator
~ Model HOl-8401A Leveler Amplifier
Options:
01. Rechargeable battery installed, provides up
to 24 hours continuous operation,
02. Rear input connector wired in parallel with
front panel input connector,
10. With 20 foot cable for 100 n or 200
11. With 50
foot cable for 100
12. With 100
foot cable for 100
13. With 200 foot cable for 100
21. With
Dimensions:
6-17/32 in. (16.6 cm) high, 7-25/32 in. (19.77 cm)
wide, 12-1/2 in. (31.75 cm) deep
01370-1
50 foot cable for 200
22. With 100 foot cable for 200
23. With 200 foot cable for 200
n
n
n
n
n
n
n
mount,
mount,
mount,
mount,
mount,
mount,
mount.
1-1
Section I
Paragraphs 1-5 to 1-11
Model 431B
Table 1-2. Model 431B Thermistor Mounts
Type
Coaxial
alone. In addition a jack in series with the panel meter
permits digital or chart recording of measurements,
operation of alarm or control systems and use in a
closed-loop leveling system.
Frequency
Range
Operating
Resistance
in ohms
10 mc to 10 gc
200
<FjJ S486A
2.6 to 3.95 gc
100
<FjJ G486A
3.95 to 5.85 gc
100
<FjJ J486A
5.3 to 8.2 gc
100
<FjJ H486A
7.05 to 10.0 gc
100
<FjJ X486A
8.2 to 12.4 gc
100
<FjJ M486A
10.0 to 15.0 gc
100
1-8. INSTRUMENTS WITH OPTIONS.
<FjJ P486A
12.4 to 18.0 gc
100
18.0 to 26.5
200
26.5 to 40.0
200
1-9. The options available with the Model 431B
Power Meter are given in table 1-1. The thermistor
mount cable options require modification and recalibration of the Model 431B Power Meter. The recalibration procedures for the cables are given in section
V, Maintenance. For further information as to the
ordering of options etc., contact your local <FjJ Engineering Representative.
Waveguide
<FjJ 478A
<FjJ K486A
<FjJ K486AC*
<FjJ R486A
<FjJ R486AC*
1-6. ACCESSORIES.
1-7. Two accessories are 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 Model 431B. Thermistor mounts are
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 is given in table 1-1, Specifications.
* With circular contact flange adapter
1-10. INSTRUMENT IDENTIFICATION.
1-5. The Model 431B has provIsIons for using the
dc substitution method of measurement and for checking calibration accuracy of the power meter. The dc
substitution method of measurement which requires
other equipment provides greater power measurement
accuracies than can be obtained by the power meter
1-2
1-11. Hewlett-Packard uses a two-section eight-digit
serial number (000-00000). If the first three digits of
the serial number on your instrument do not agree
with those on the title page of this manual, change
sheets supplied with the manual will define differences
between your instrument and the Model 431B described
in this manual.
01370-1
Section II
Paragraphs 2-1 to 2-8
Model 431B
SECTION II
INSTALLATION
2-1. INSPECTION.
2-2. This instrument was carefully inspected both
mechanically and electrically, before shipment. , It
should be physically free of mars or scratches and in
perfect electrical order upon receipt. To confirm tliis,
the instrument should be inspected for physical damage
in transit. Also check for supplied accessories, and
test the electrical performance of the instrument using
the procedure outlined in paragraph 5-71. If there is
damag~ or deficiency, see the warranty on the inside
rear cover of this manual.
2-3. INSTALLATION.
2-4. The ~ Model 431B is fully transistorized; therefore no special cooling is required. However, the
instrument should not be operated where the ambient
temperature exceeds 55°C (140°F).
2-5. RACK MOUNTING.
2-6. The Model 431B is a submodular unit that when
used alone can be bench mounted only. However,
when used in combination with other submodular units
it can be bench and/or rack mounted. The ~ combining
case and adapter frame are designed specifically for
this purpose.
2-7. COMBINING CASE. The combining case is a
full- module unit which accepts varying combinations
of submodular units. Being a full-module unit, it can
be bench or rack mounted analogous to any full-module
instrument. An illustration of the combining case is
shown in figure 2-1. Instructions for installing the
Model 431B in a combining case is given graphically
in figure 2- 2.
2-8. ADAPTER FRAME.
The adapter frame is
a rack frame that accepts any combination of submodular units. It can be rack mounted only. An
illustration of the adapter frame is given in figure 2-3.
Instructions are given below;
a. Place th~dapter frame on edge of bench as
shown in step \!J ' figure 2-4.
b. Sta~the submodular units in the frame as shown
in step 2 ,figure 2-4. Place the sp~er clamps between ins ruments as shown in step ~ , figure 2-4.
c. PlaceAJ!acer clamps on the two end instruments
(see step ~ , figure 2-4) and push the combination
into the frame.
DIVIDER ASSEMBLY
DIVIDER LATCH
RETAINER
MP -5-1178
Figure 2-1. The Combining Case
01370-1
2-1
Model 431B
Section II
Paragraphs 2-9 to 2-13
STEP
CD
SLIDE TOP PART
TO LIMIT
STEP
STEP
®
®
PUSH DOWN
TO RELEASE
SLIDE BOTTOM PART
TO LIMIT
STEP
STEP
®
PLACE INSTRUMENT
INTO CASE
®
PUSH IN TO LIMIT
STEP
0
SET RETAINER BACK
INTO PLACE
STEP
@)
SLIDE OVER TO LIMIT
STEP
®
PUSH UP TO LOCK
Figure 2-2. Steps to Place Instrument into Combining Case
d. Insert screws on either side of frame, and tighten
until submodular instruments are tight in the frame.
...
FILLER PANEL
i
I
\
\
o
o
o
o
e. The complete assembly is ready for rack
mounting.
2-9. THREE-CONDUCTOR POWER CABLE.
2-10. To protect operating personnel, the National
Electrical Manufacturers' Association (NEMA) recommends that the instrument panel and cabinet be
grounded.
All Hewlett-Packard instruments are
equipped with a three-conductor power cable which,
when plugged into an appropriate receptacle, grounds
the instrument. The offset pin on the power cable
three-prong connector is the ground wire.
2-11. To preserve the protection feature when operating the instrument from a two-contact outlet, use a
three-prong to two-prong adapter and connect the
green pigtail on the adapter to ground.
I
LD-S-IID
I
Figure 2-3. Adapter Frame Instrument Combinations
2-2
2-12. PRIMARY POWER REQUIREMENTS.
2-13. The Model 431B can be operated from an ac or
dc primary power source. The ac source can be either
115 or 230 volts, 50 to 1000 cps. The dc source is a
24-volt rechargeable battery.
The rechargeable
battery is supplied with option 01 instruments only.
01370-1
Model 431B
Section II
Paragraphs' 2-14 to 2-18
2-14. For operation from ac primary power, the
instrument can be easily converted from 115- to 230volt operation. The LINE VOLTAGE switch, S1 a
two-position slide switch located at the rear of the
instrument, selects the mode of ac operation. The
line voltage for which the instrument is set to operate
appears on the slider ofthe switch. A 15/100-ampere,
slow-blow fuse is used for both 115- and 230- volt
operation.
CAUTION
00 NOT CHANGE THE SETTING OF 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
or instruments that have field-installed batteries.
When the battery is used as the Model 431B power
source for the first time, perform the following steps:
a. Connect Model 431B to ac source. Set POWER
switch to CHARGE and charge battery for a minimum
of 16 hours or overnight. Note: the battery can be
maintained in the charging state indefinitely without
damaging the battery. It will assume its full capacity,
1.25 ampere hour, and no more.
b. Perform turn-on procedure given in figure 3-2
with POWER at AC. If the procedure checks out
normally, proceed to step c.
c. Repeat turn-on procedure given in figure 3-2
with POWER at BATTERY ON. If operation is not the
same as that obtained with ac power applied, refer to
section V paragraph 5-40, Battery and Charging Check.
2-17. REPACKAGING FOR SHIPMENT.
2-18. The Model 431B is 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 as
a general guide for repackaging the instrument.
a. Place the instrument in the foam-pack as shown
in figure 2-5.
b. Mark the packing box with I t Fragile", "Delicate
Instrument", etc as appropriate.
Note
If the instrument is to be shipped to Hewlett-
Packard for service or repair, attach to the
instrument a tag identifying the owner and
indicating the service or repair to be accomplished, include the model number, and full
serial number, of the instrument. In any
correspondence, identify the instrument by
model number, serial number and serial
number prefix.
CD
ADAPTER
FRAME
\
_ _ _ _ _ INSTRUMENT
~--~/
~~----- -~
®
SPACER CLAMP
RETAINING SCREWS
Figure 2-4. Two Half Module in Rack Adapter
01370-1
Figure 2- 5. Repackaging for Shipment
2-3/2-4
Section III
Paragraphs 3-1 to 3-16
Model 431B
SECTION III
OPERATION
3-1. INTRODUCTION.
3-2. The ~ Model 431B Power Meter measures rf
power ranging from .01 to 10 milliwatts with power
meter accuracy of ±3%. Since the zero carries over
within 1%, accuracies of at least ±4% can be obtained
on any range by a single zeroing on only the lowest
range.
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 AND INDICATORS.
3-6. The front and rear panel controls and connectors
are explained in figure 3-1. The explanations are
keyed to corresponding controls and indicator on the
drawing of the front and rear panels of the instrument
provided with the figure.
3-7. OPERATING INSTRUCTION.
3-8. Figure 3-2, Turn-On and Nulling Procedure,
and figure 3-3, DC Substitution Technique, give stepby-step instructions for operating the Model 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 to power meters having
a factory or afield-installed rechargeable nickel-cadmium battery. See figure 3-1, Turn-On and Nulling
Procedure, for step-by-step instructions for operating
the Model 431B from a battery.
3-11. BATTERY CHARGING TIMES.
3-12. The battery used in the Model 431B requires
two hours of charge time for one hour of battery
operation.
When the battery is fully charged, the
Model 431B can be continuously operated for 24 hours
with 48 hours of charge time. However, it is recommended 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 at full charge.
3-13. BATTERY CHARGE CHECK.
3-14. Under normal conditions, a fully charged
battery will start at approximately 27 volts and drop
to about 22 volts after 24 hours of continuous use at
room temperature.
a. Connect the Model 431B to ac primary power.
Set POWER to AC and perform the turn-on and nulling
01370-1
procedure given in figure 3-2. This will check for
normal operation from ac primary power. Ifperformance is normal proceed to step b.
b. Set POWER to BATTERY CHARGE:
the AC
CHARGE lamp will glow. Allow Model 431Bto charge
the battery for 48 hours. This will allow the battery
to obtain a full charge.
c. After the recharge interval, set POWER to
BATTERY ON. Since battery is now fully charged,
you should be able to zero-set and null the meter
(figure 3- 2). If not the battery or battery charging
circuit is at fault. Refer to Battery and Charging
Checks paragraph 5-40.
3-15. MAJOR SOURCES OF ERROR, MICROWAVE
POWER MEASUREMENTS.
3-16. In microwave power measurements, the following are the major sources of error: 1) mismatch error
or tuner loss (when a tuner is used to tune out mismatch
error), 2) bolometer mount efficiency, 3) substitution
error, 4) instrument error and 5) error due to the
unilateral properties of a thermistor. Thus five errors
must be known if accurate power measurements are
to be obtained. Expressed mathematically:
Total measurement error =
mismatch (or tuner) loss + calibration factor +
instrument error + error due to the unilateral
properties of a thermistor.
a. Mismatch Loss. Unless the mount and rf source
are perfectly matched to the transmission system, a
fraction of incident power is reflected and does not
reach the thermistor. Since there generally is more
than one source of mismatch in a microwave measurement system and the resulting error signals interact, loss cannot be calculated from the swr figure, it
can only be expressed laying between two limits.
Limits of mismatch loss generally are determined by
means of a chart such as the Mismatch Loss Limits
chart included in each of the thermistor mount
Operating Notes. A tuner such as the ~ Model 872A
or 870A can be used to minimize loss, although the
tuner itself will infroduce some loss.
b. Bolometer Mount Efficiency and Substitution
Error. Not all the rf power applied to the mount is
used to heat the rf thermistor. Some of it is absorbed
by the other elements in the mount, such as the walls
of the rf chamber, the heat sinks, the leads, etc. Substitution error results because rfp.ower does not affect
the thermistor to the same degree as dc power. Substitution error and mount efficiency are often combined
for a simplicity of measurement into what is termed
II calibration factor' 1 •
Typically, the calibration factor
of the Model X486A waveguide mount is 97% to 98%.
3-1
Model 431B
Section III
Figure 3-1
o
431B POWER METER
o
THERMISTOR MOUNT
1. POWER: The POWER switch sets up connections
to the selected power sources or to the battery
charging circuit. When the power switch is in
the AC position, externally supplied 115 or 230
volts is applied to the instrument. If the instrument contains a battery, a trickle charge is
applied to maintain the battery at full charge.
With POWER at BATTERY ON, a 24-vdc battery
within the instrument supplies primary power
to the instrument. With POWER at CHARGE,
115- and 230-volt power is used to charge the
battery (16 to 24 hours is required to .obtain
full battery charge).
The instrument is inoperative in this position. Note: Batteries
are installed at the factory for option 01 instruments only.
DC CALIBRATION
8 SUBSTITUTION
LINE
VOLTAGE
4. MOUNT RES: This two-position slide switch
sets the power meter to accommodate thermistor mounts 100- or 200-ohm nominal
resistance.
5. ZERO and VERNIER:
The ZERO control
coarsely sets the meter pointer near zero; the
VERNIER control is a more exact adjustment
which sets the meter pointer on zero.
6. DC CALIBRATION & SUBSTITUTION. This
terminal permits application of known direct
current to the rf bridge. The power reading
obtained with the accurately known dc power
applied is then compared with the reading
obtained when rf power was applied. The dc
substitution technique is used to both calibrate
and increase the accuracy of 431B power
measurement.
2. RANGE: The RANGE switch can be set for full
scale power readings from .01 to 10 milliwatts
in seven steps. It also includes a NULL position which, in conjunction with the adjacent
null screwdriver adjust, insures that the metering bridge is reactively balanced.
7. RECORDER: The RECORDER jack is a twowire telephone jack (one side grounded) for
monitoring the current which operates the
Model 431B meter.
3. THERMISTOR MOUNT:
The THERMISTOR
MOUNT connector is a female receptacle that
accepts a specially-made cable which is supplied
with the instrument. The cable connects the
mount thermistors into their respective bridges
within the power meter.
8. LINE VOLTAGE: The LINE VOLTAGE switch
Sl, 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 230
volt operation.
Figure 3-1. Front and Rear Panel Controls and Indicators
3-2
01370-1
Model 431B
Section III
Figure 3-2
o
•
VERNIER
ZERO
H[llr"~'HURD
4318 POWER METER
THERMISTOR
MOUNT
@
NULL
.. _....
~oo~n ~
~LD-M-604
1. Connect thermistor mount and cable to the
THERMISTOR MOUNT. c5j; thermistor mounts
and their frequency ranges are given in table
1-2, Model 431B Thermistor Mounts.
7. Repeat steps 5 and 6 until NULL reading is
obtained within NULL region on the meter.
Note
If instrument is battery-operated and you
Note
When possible, the Model 431B should be
zeroed and nulled with the power source to
be measured connected to 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 431B Power Meter.
2. Set MOUNT RES to match thermistor mount
resistance (100 or 200 ohms).
3. Set RANGE to .01 MW.
4. Set POWER to AC; AC & CHARGE lamp will
glow. If instrument is battery-operated, rotate
POWER to BATTERY ON.
5. Adjust ZERO control for 25 to 75% of full scale
on meter.
6. Rotate RANGE to NULL and adjust null screwdriver adjust (adjacent to NULL on RANGE
switch) for a minimum reading in NULL region.
are not able to zero the meter, or 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 and VERNIER
controls.
Note
Zero-set accuracy of 1% can be obtained
by zero setting the meter on the most
sensitive range (.01 MW) only, and assuming the meter is properly zeroed on all less
sensitive ranges. For maximum accuracy,
zero set the meter on the range to be used.
9. Apply rf power at the thermistor mount and
read power on Model 431B meter. Power is
indicated on the meter directly in mw or dbm.
Note
This instrument is accurate to within ±3%.
Accuracy to ±1%, or better, is possible
using the dc substitution technique described in figure 3-3. See also paragraphs
3-15 and 3-17.
Figure 3-2. Turn-On and Nulling Procedure
01370-1
3-3
Model 431B
Section fil
Figure 3-3
POWER SUPPLY
o-300vdc
0-20ma
~MODEL 4318
(~71IA)
POWER METER
]
10K, 10%, lOW
1. With power supply turned off, connect the
Model 431B as 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 at the thermistor mount" and
note and record the reading of the Modei 431B
meter. This is the reference for the substitution measurement.
CAUTION
Never apply more than 20 rna dc to the DC
CALIBRATION
SUBSTITUTION terminals of the Model 431B.
6. Read the voltmeter with monitors the substitution current. The voltmeter reading can be
interpreted as current in milliamperes because
the voltage is measured across 1000 ohms.
This current is I dc .
7. Calculate power in mw from the expression
Note
A second digital voltmeter, in parallel
with a 1000-ohm (±10%, 1 watt) resistor,
connected in series with the RECORDER
output of the Model 431B will increase
accuracy of reference duplication.
4. Turn off, or disconnect, the rf source.
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 series with the supply.
Power (MW) =
where Rd
and I
dc
=
2
I dc R d
3
4 x 10
operating resistance of the termistor (100 or 200 ohms)
substitution current in milliamps
(from step 6)
9. To minimize error due to drift in either the
reference or substituted power level, steps 1
through 6 should be repeated.
Figure 3-3. DC Substitution Technique
3-4
01370-1
Section III
Paragraphs 3-17 to 3- 26
Model 431B
c. Instrument Error. This is the inability of the
power meter to accurately measure and interpret the
information available at the thermistor element. In
specifying the accuracy of a power meter, instrument
error is the figure usually given. For the Model 431B,
instrument error is ±3% of full scale, 20°C to 35°C.
This error can be reduced by special techniques such
as the dc substitution method discussed in para. 3-17.
d. Error Due to the Unilateral Properties of a
Thermistor. The thermistor used in conjunction with
the Model 431A/B exhibits unilateral properties which,
when the source of power is a dc current, causes a
slightly different indication of power than is obtained
by the calculation of I2R. Thus the dc power required
to produce a reading on the Model 431A/B Power
Meter is not the same as the rf power required to
produce the same reading on the Model 431A/B Power
Meter. The maximum error produced from this source
of error is ±O. 3 JJ. watts, typical error is ±0.1 JJ. watt.
Since the order of magnitude of this error is small
(0.3 JJ. watt) it need be minimized only on the two most
sensitive ranges of the Model 431A/ B Power Meter.
Refer to the c§j; Model 8402A Power Meter Calibrator
manual for procedure used to minimize this error.
3-17. POWER METER ACCURACY OF 1% OR
GREATER USING THE DC SUBSTITUTION
METHOD.
3-18. Highly accurate instruments are 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 as a reference and the determination of rf
power is based on precise dc measurements. In
general the technique involves:
a. Applying rf power to the Model 431B in the usual
manner, and noting the resulting meter indication for
use as a reference.
b. Removing the rf power and applying sufficient dc
at the DC CALIBRATION & SUBSTITUTION terminals
to exactly duplicate the meter indication produced by
the rf power.
c. Use the value of dc which duplicated the reference
in calculating rf power.
3-19. Although the dc substitution technique is the
most accurate method of measuring rf power, there
are sources of error that must be considered. The
accuracy of the dc substitution technique depends
largely upon:
a. how precisely the reference is duplicated,
RF SOURCE
-
TEMPERATURE
COMPENSATED
THERMISTOR
MOUNT
( @; 478A. 486A)
-
b. how accurately the value of the substituted dc 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, error produced by the
Model 431B Power Meter can be reduced to 1% or less.
This is assuming nominal thermistor mount resistance
(100 or 200 ohms) and that half the applied dc flows
through the rf thermistor. The dc substitution technique using the Model 431B is shown in figure 3-3.
3-21. EQUIPMENT USED FOR DC SU BSTITUTION.
3- 22. The c§j; 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 c§j; Model 8402A Power Meter Calibrator to
perform the dc substitution measurements.
3-23. Although the most convenient and accurate means
of applying the dc substitution technique is by using
c§j; 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 are ungrounded to eliminate ground
currents.
3-24. ADDITIONAL APPLICATIONS.
3-25. At the RECORDER output, the Model 431B furnishes a current (0 to 1 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 are 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 across the Model 431B RECORDER output
must be 1000 ohms. Any type of recorder may be
used with the Model 431B; if input resistance exceeds
1000 ohms, use a shunt across the recorder input.
c§j; MODEl 4318
JI02
~RDER
POWER
METER
't
~
~Iooon
INPUT
RECORDER
80-5-252
Figure 3-4. Permanent Record
01370-1
3-5
Section ill
Paragraphs 3-27 to 3-30
Model 431B
..........._oO·OI •. I.I.IOMW
RF SOURCE
-
TEMPERATURE
COMPENSATED
THERMISTOR
MOUNT
( . 478A 486A)
rfj; MODEl 4318
-
rfj;NODEL 405
DIGI TAL
VOLTME TER
POWER
METER
80-5-253
Figure 3-5. 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 Rt is 1000 ohms ±.1%. Correct
placement of the decimal in the readout is determined
by the setting of the power meter RANGE switch. On
the divider-switch arrangement at the voltmeter input
may be replaced by a single 1000-ohm .1% resistor.
With this arrangement, on the .01, .1, and 10 MW
ranges, power is read in the same way as when the
arrangement shown in figure 3-5 is used, decimal
placement being determined by the setting of RANGE.
On 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.
Model 431B and its thermistor mount, such a leveling
system requires the ~ HOl-8401A Leveler Amplifier
and a directional coupler with good directivity such as
one of the ~ 752 series of waveguide couplers or 760
series 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 HOl-8401A the signal
from the Model 431B is compared to an internal reference voltage, and the difference is amplified and fed
back as a control voltage to hold output power constant.
3-29. MONITOR CONTROL SYSTEMS. By adding a
dc amplifier and relay circuit to the rf monitoring arm
of a system, the dc signal provided by the Model 431B
can be used to actuate alarm or control circuits. Arrangement of equipment to provide an alarm or control
system is shown in block diagram form in figure 3-7.
Table 3-1. Voltmeter Readout to Power Multipliers
Range
3-30. DETERMINING INSERTION LOSS OR GAIN AS
A FUNCTION OF FREQUENCY. Arrangement of a
system to obtain information on insertion loss or gain
as a function of frequency is indicated in figure 3-8.
Initially, the device under test 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 as
frequency is swept; this curve is the reference. Next,
insert the device under test between the sweep
oscillator and the thermistor mount, and again record
frequency response.
The difference between the
second reading and the reference, at anyone frequency,
is the insertion loss or gain of the device at that
frequency.
Multiplier
.03MW
0.0316
.3
0.316
3
3.16
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 as bwo sweep oscillators, twt microwave amplifiers, and rf generators. In addition to the
....--
t
AMPLITUDE
MODUlATION
INPUT
-
RF
POWER
SOURCE
--+
TEMPERATURE
COMPENSATED
THERMISTOR
MOUNT
~ 478A.486A
-
-
~MODEL 4318
POWER
METER
RECORDER
f.o!tlO2
't
~
INPUT
rfj; HOI- 840lA
LEVELER
AMPLIFIER
-
OUTPUT
DIRECTIONAL
COUPLER
-
-
_
LOAD
CONTROL VOLTAGE (NEGATIVE FEEDBACK)
80-5-254
Figure 3-6. Leveler Setup
3-6
01370-1
Section m
Figures 3-7 and 3-8
Model 431B
JI02
r---
t
RF SOURCE
-
TEMPERATURE
COMPENSATED
THERMISTOR
MOUNT
<[;) 478A. 486A
COUPLER
~
RECORDER
-
~MODfl43IB
~
POWER
METER
11r
DC
AMPLIFIER
-
RELAY
~
,cood
-
~
ALARM,
CONTROL.
PROTEC TIVE,OR
CORRECTIVE
DEVICES
80-5- 255
-
-
LOAD
Figure 3-7. Monitor Control Systems
RF
SWEEP
OSCILLATOR
RF
OUTPUTN
-
"
MICROWAVE
DEVICE
M~UNT
~
SWEEP
OUTPUT
01370-1
hl_
TEMPERATURE
COMPENSATED
THERMISTOR
1'NiJ 4 8A, 486A
-
--
~MODEl43IB
POWER
METER
RECORDER
Y
JI02
rf~
INPUT
~
I
~
~
:IOO~
X-V RECORDER
~
-
X
INPUT
80-5-256
Figure 3-8. Determining Insertion Loss or Gain
3-7
Model 431B
Section IV
Figure 4-1
,..------,
I
DC CALI BRATION
I
~ ~U!S~ ~T-!.?~
JI03
IIOKC
I
>-)
IOKC
OSCILLATOR
AMPLI FIER
0108- 0111
~-----l
-
DETECTION
THERMISTOR
I
TIOI
MICROWAVE
POWER
LEGEND
I
MOUNT
RES
I
IIOKC
-
5101
o "JI'
10KC
AMPlIFl ER
0101-0103
I
DC
SYNCHRONOUS
DETECTOR .......--~
CR101-CR104
I
I RANGE I I
5102
......
....
I
Ioc
FEE DBACK
CURRENT
GENERATOR
0107
I POWER I
/
0
DIFFERENTIAL
AMPLIFIER
0104/0105
:........
0---1I
52
...... ....
...... .....
FEEDBACK CURRENT SOUARED
GENERATOR
0106
MIOI
/
115/230VAC
50-1000CPS OR
-24VDC
REGULATEO
POWER
SUPPLY
+I. 5y DC
-18VDC (REG)
-25VDC (REG)
OPTIONAL BATTERY
Figure 4-1. Block Diagram
4-0
01370-1
Model 431B
Section IV
Paragraphs 4-1 to 4-11
SECTION IV
THEORY OF OPERATION
4-1. OVERALL DESCRIPTION.
4-6. CIRCUIT DESCRIPTION.
4-2. Figure 4-1 is a block diagram which shows the
Model 431B Power Meter and its associated thermistor
mount. The thermistor mount contains two thermistor
elements (Rd and Rd. Thermistor element Rd absorbs
the rf power applied to the mount; thermistor element
R c converts the applied rf power to a meter indication
and provides compensation for ambient temperature
changes at the thermistor mount.
4-7.
4-3. The power meter circuitry incorporates two
bridges which are made self-balancing by means of
separate feedback loops. Regenerative (positive) feedback is used in the detection loop; degenerative feedback in the metering loop. One thermistor element is
used in one arm of each of the self-balancing bridges.
In the detection loop, the 10 kc oscillator-amplifier
supplies enough 10 kc power (110 kc) to bias thermistor
element Rd to the operating resistance which balances
the rf bridge. The same amount of 10 kc power is also
supplied to thermistor element R c by the series-connected primaries of transformers T101 and T102.
4-4. When rf power is applied to thermistor element
Rd, an amount of 10 kc power equal to the rf power is
removed from thermistor element Rd by the selfbalancing action of the rf bridge. Since the primaries
of T101 and T102 are series-connected, the same
amount of 10 kc power is also removed from thermistor
element R c ' 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 dc power
is 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 is derived which is proportional to the square
of the feedback. Since power is a square-law function
of current, the analog current thus derived is proportional to rf power, making possible the use of a
linear scale on the meter.
4- 5. There is 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 is required to hold their operating
resistances constant. The decrease, for both thermistors, is 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 ambient temperature changes does not
affect the meter indication. The compensation capability depends upon the match of thermistor temperature characteristics. When thermistor mounts are
built, the thermistors are selected to insure optimum
match of thermal characteristics.
01370-1
RF BRIDGE CIRCUIT.
4-8. A simplified schematic diagram of the rfbridge
circuit is shown in figure 4-2. The rf bridge circuit
consists of the rfbridge and 10-kc oscillator-amplifier.
The rf bridge includes thermistor Rd' the secondary
Winding of T101, resistors R102 andR103, the MOUNT
RES switch, S2, and capacitance represented by Ca
and Cb. The rf bridge and 10 kc oscillator-amplifier
are connected in a closed loop (the detection loop) which
provides regenerative feedback for the oscillatoramplifier. This feedback causes the 10 kc oscillatoramplifier to oscillate.
4-9. When the power meter is off, thermistor Rd is
at ambient temperature and its resistance is about 1500
ohms; the rf bridge is unbalanced. When the power
meter is turned on this unbalance of the rf bridge
causes a large error 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 R d to its operating resistance (100 or
200 ohms) the rf bridge approaches a state of balance
and regenerative feedback diminishes until there is just
sufficient 10 kc bias power to hold Rd at operating resistance.
This condition is equilibrium for the
detection loop.
4-10. With application of rf power, thermistor Rd's
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 arm of the rf bridge so that the bridge will
function with either a 100 or 200 ohm thermistor mount.
TO METERING BR1DGE
IOKC BIAS
Rd
r----,
RI03
200.3
I
I
RI02
200.3
I
I
RFI
SHIELDI
I
I
IOKe
OSCILLATOR
10KC
....._A_NP_L_IF_IE_R...."
S~~~~~
t
RF
Figure 4-2. RF Circuit
4-1
Section IV
Paragraphs 4-12 to 4-19
Model 431B
4-12. METERING BRIDGE CIRCUIT.
FROM
RF
4-13. A simplified schematic diagram ofthe metering
bridge circuit is shown in figure 4-3. Operation of the
metering bridge circuit is similar to the rf bridge circuit. It uses the same principle of self-balancing
through a closed loop (metering loop). The major difference is that dc rather than 10-kc power is used to
rebalance the loop. The resistive balance point is
adjusted by the ZERO and VERNIER controls which
constitute one arm of the bridge. The MOUNT RES
switch (not shown in figure 4- 3) which is 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 200-ohm position some of the feedback current is
shunted to ground through R101. This maintains the
I2 R function constant when mount resistance is changed
from 100 or 200 ohms. The switch also adds the
necessary reactance for each position.
BRIDGE
4-14. The same 10 kc power change produced in the rf
bridge by rf power also affects the metering bridge
through the series connection of T101 and T102 primaries. Although this change of 10-kc power 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 is a change in the 10-kc
error signal (S10 kd applied to the 10-kc tuned amplifiers in the metering loop. These error signal variations are 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 its normal, near-balance
condition.
METERING
10 KC
B I AS
BRIDGE
- - - - T " II-=-O-:-KC::----""'""'.A.A.A.AAA.~----------,Ob
FROM
RF BRIDGE
-
rI
CI03 1
o :
NULL
ADJ.
I
L _
---------,•
COMPE NSAT ION I
THERMISTOR :
TI02 •
+SIOKC
I
IVERNIERI
I
_ _ _ _ _ _ _ _ .-J
RF SHIELD
DC BIAS
10KC ERROR SIGNAL
-
IDe
RECTIFIED
10KC
TUNED
AMPLIFIERS
0101.102 &103
.....- - - IOKC
~
SYNCHRONOUS
DETECTOR
......
DC
AMPLIFIER
01041105
t
/ .....IOKC
~
DC
~
DC BIAS
CIRCUIT
0107
Figure 4-3. Metering Bridge Circuit
4-2
IOKe BIAS
---------.
CI03
o
NULL
ADJ.
-..,
IZERol
AND
I
IRF
I
I
_J
SHIELD
l
IVERNIERI
IOKe
ERROR
SIGNAL
COMPENSATION
THERMISTOR
-=
10Ke
AMPLIFIER
0101. 102. 103
Figure 4-4. Nulling Circuit
4-16. The reactive components of the metering bridge
are balanced with variable capacitor C103 and inductor
L102. Null adjust, C103, is an operational adjustment
and L102 is a maintenance adjustment. Null adjust
C103, is adjusted with the RANGE switch in the NULL
position. A simplified schematic diagram of the NULL
circuit is shown in figure 4-4. The 10 kc signal is
taken at 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
error signal from the metering bridge to a varying dc
signal. A simplified schematic of the synchronous
detector is shown in figure 4-5. The detector is a
bridge rectifier who ch has a rectifier in series with a
linearizing resistance in each of its arms. Two 10-kc
voltages, designated E3 and E4 in figure 4-5, are
applied to the bridge; 1) voltage E3, induced in the
secondary of transformer T 103, is proportional to the
metering-bridge error signal and is incoming from
10-kc tuned amplifier Q103; 2) voltage E4, induced in
the secondary of T 104, is proportional to a voltage
supplied by the 10-kc oscillator-amplifier. Voltage
E4 is much larger than voltage E3 and switches appropriate 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
CR101 and CR103 for a negative-going signal. The
rectified output is taken at the center taps of transformers T103 and T104.
4-19. Operation of the circuit is as follows: When the
left side of T 104 is positive with respect to the right
side (see figure 4-5A), diodes CR102 and CR104 conduct while diodes CR101 and CR103 are biased off.
With the polarities reversed (see figure 4-5B), the
01370-1
Section IV
Paragraphs 4-20 to 4-24
Model 431B
SYNCHRONOUS
DETECTOR
-----....,T103
SYNCHRONOUS
DETECTOR
TI03
__
r----~---
-----......
FROM 10KC
TUNED
AMPLIFIER.
r---:::----r---::---........
FROM IOKC
TUNED
AMPlI FIER.
QI03
QI03
+--
t
+
+--
I
I
I
•
•
•
•
I
:
•
E4
t
+-- ... --
I
+
RECTIFIED
10KCOUTPUT
TI04
L..-~_---:-
--+
t
I
I
I
I
10KCFROM
OSC ILL A TOR /
AMPLIFIER
-IOKC BlASI
+-- +--
+
I
I
I
I
•
+
I
I
•
t
I
-IOKC BIAS,
E4
~"'-':""-
-- ....
--+
-- ..
_
-- .... -- ....
I
+ --
RECTIFIED
10KCOUTPUT
+
10KCFROM
OSCILLATOR/
AMPLI FI ER
TI04
I
+
- - - - - ..
( a)
-- ....
-- -+
---+ - - +
50-5-179
(b)
Figure 4-5. Synchronous Detector
diodes CR102 and CR104 are biased off. The resultant
output is a pulsating dc signal equivalent to the applied
10-kc error signal. This pulsating dc signal is filtered
and applied to differential amplifier Q104/Q105.
4-20. Proper synchronous detector output requires an
in phase relationship between E3 and E4 and for amplitude of E4 to be larger than that of E3.
TO FEEDBACKCURRENT-SOUARED
GENERATOR
0106
~-"'''''.-4-41
FROM
COLLECTOR
OF 0104
4-21. DIFFERENTIAL AMPLIFIER Q104/Q105.
4-22. A simplified schematic diagram ofthe amplifier
is shown in figure 4-6. The pulsating dc from the
synchronous detector is filtered by Cl17, Cl18, Cl19,
I DC
DC BIAS TO
METERING
BRIDGE
FEEDBACK CURRENT
GENERATOR
QI07
IRANGE I
o
5102
-25V
-25V
r~~9
OUTPUT TO: (I) 0106
(2) 0107
r-----I----+-----.-- -IBV
-18VDC
CIIB
50-5-174
+
CII?
Figure 4-7. Feedback Current Generator
RI40
and R140, amplified by Q104 and fed to both the feedback current-squared generator, Q106 (figure 4-7) and
feedback current generator Q107. Temperature compensation and low emitter circuit resistance for Q107
are provided by Q105. Diode CR106 protects Q106 and
Q107 from excessive reverse bias when Q104 is cut off.
RECTIFIED
10KC
FROM
SYNCHRONOUS
DETECTOR
RI44
4-23. FEEDBACK
RI43
+1.5V
Figure 4-6. Differential Amplifier
01370-1
=
CURRENT GENERATOR Q107.
4- 24. A simplified schematic diagram of the feedback
current amplifier is shown in figure 4-7. The dc signal
from the differential amplifier is applied to feedback
current generator QI07. QI07 has two functions: 1} it
4-3
Model 431B
Section IV
Paragraphs 4-25 to 4-35
METER
MIOI
IOKC BIAS-
RI78
RI74
RI76
-
=
DETECTION
HERMISTOR
Rd
RI73
RI75
RI77
roc
Rill
CALIBRATlONl
~SUBST~T~ =
RI68
JI02
CRIIO
RI67
CRI09
RI6
RI70
CRI08
T
f
RI13
CRI12
.
TO METERING
SRI DGE
TIOI
I/ZIOC-
-II2IDC
fEED8ACKCURRENTSQUARED
GENERATOR
0106
RI71
RI72
- 1 8 V D C - - -.......- - - - -........-..-+--..~
50-5-07'
Figure 4-8. Meter Circuit
completes the metering loop to the metering bridge,
and 2) it operates in conjunction with the first 10-kc
amplifier, Q101, and the RANGE switch to change
metering loop gain so 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,
J102. The purpose of the meter circuit is to convert
a linear voltage function, proportional to applied
power, to a squared function so that power may be
indicated on a linear meter scale. The linear voltage
function is applied to the base ofQ106 and is converted
to a square law function by the squaring circuit in
series with Q106 emitter.
4-27. SQUARING CIRCUIT. The squaring circuit includes diodes CR109-113, and resistors R167-177.
Temperature compensation for the squaring circuit
is provided by CR108.
4- 28. The design of the squaring circuit is such that
individual diodes conduct at discrete values of emitter
voltage so 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 which drives
the meter can be monitored at the RECORDER output,
a telephone-type two-wire jack. A RESISTOR OF
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 kc error signal would
be applied to the 10 kc amplifiers, there would be no
dc feedback from Q107, and the metering loop would
be open. With an open metering loop, zero reference
could not be accurately established. In the Model
4-4
RF
BRIDGE
.......
I
I
I
1
I
-
1
10KC
• ERROR
SIGNAL
50-5-176
Figure 4-9. DC Calibration and Substitution
431B this occurrence is prevented by insuring a closed
metering loop even when the ZERO control causes the
meter pointer to deflect downscale from zero. By the
combined actions of R141 and R179, the zero 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 R179 provides
a counter-action in the feedback current-squared
generator, Q106, so that the meter can indicate zero
even though the metering bridge is not perfectly
balanced. Resistor R179 also sets the full scale
accuracy of the meter.
4-31. DC CALIBRATION AND SUBSTITUTION.
4-32. A simplified schematic diagram of the dc calibration and substitution circuit is shown in figure 4- 9.
Highly accurate rf power measurements can be made
using the dc 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 at the DC CALIBRATION and SUBSTITUTION 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 in figure 4-10. The power supply
operates from either a 115 or 230 volt, 50 to 1000
cps ac source or from an optional 24 volt, 30 ma
rechargeable battery. Three voltages and two current
outputs are provided by the power supply. Regulated
voltages of -18 and -25 vdc and unregulated +1.5 vdc
operate the power meter circuits. The current outputs
are used for maintaining battery charge (trickle
charge) for recharging the battery.
4-35. The -18 vdc is regulated by a conventional
series regulator, Q1 through Q5. The -25 vdc is
developed across CR9, a 6.8 volt zener diode referenced at -18 vdc. The unregulated +1.5 vdc is taken
01370-1
Section IV
Paragraphs 4-36 to 4-37
Model 431B
-40V FROM
CRI a CR4
across the series diodes, CR5 and CR6. The -18 vdc
supply is adjusted by R13.
R4
A
-25VDC(REG)
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 conventional line voltage: if a battery has been installed in
the instrument, a trickle charge is supplied to the
battery. In the BATTERY ON position, instrument
operation is entirely dependent on the battery. In
the CHARGE position, supply A is connected to the,
battery for recharging: the Model 431B cannot be
operated during this time. Approximately 37 ma dc is
applied to the battery during charge time.
CR9
-25V FROM
~C,;..;,R,;::,2_a~C;;;..;R....:..;3=-----I REGUL ATOR t--_ _.....__-_18_V_D_C_(_R_EG_l
+ 1.5
SO-S-177
Figure'4-10. Regulated Power Supply
//- -i - - - - - - - - - - - - - - - - - - - ] - - - - - - - - - -
FI
/
/ 6
S2
/ :
I POWER I
o
VDC(UNREG:
CENTER
TAP OF TI
I
0
R4
-/7
//
-25V
(REGl
0
I
§!@ @ill
~
I
IOFFI
I r------J
I BATTERY I
I
I
I
I
R3
R2
)
REGULATOR
t--....----_'8_V..;.,.(R_E...,;Gl. .
/
POWER
TRANSFORMER
o
-25 VOLT
RECTIfiER
-
-
OPTIONAL
BATTERY
+ 1.5V (UNREGl
CR5
CR6
Figure 4-11. Power Switch Arrangement
01370-1
4-5
Model 431B
Section V
Figure 5-1
TILT STAND
Figure 5-1. Cover Removal
5-0
01370-1
Section V
Paragraphs 5-1 to 5-7
Model 431B
SECTION V
MAINTENANCE
5-1. INTRODUCTION.
5-2. This section includes instructions and information for the maintenance, troubleshooting and repair
of the Model 431B Power Meter.
5-3. The testing and repair of ctiJ Model 486A and
478A thermistor mounts are not discussed in this
manual. Complex procedures and special equipment
are needed for these operations. Therefore, if the
cause of trouble is proved to a thermistor mount, an
ctiJ Engineering Representative should be contacted or
mount should be returned to factory (do not attempt
to repair the thermistor mount).
the circuit board and removal of the meter, RANGE
POWER, or MOUNT RES switch would require the
removal of the bottom cover and one, or both, of the
side covers.
5-6.
a. At the rear of the instrument, remove the two
screws which retain the cover.
b. Grasp the cover from the rear, slide in back 1/2
inch, then tilt forward edge of the cover upward and
lift the cover from the instrument.
5-7.
5-4. COVER REMOVAL AND REPLACEMENT.
5-5. Refer to figure 5-1 when removing instrument
covers. Removal of the top cover exposes the circuit
·areas shown in figure 5-2. Routine checks and adjustments can be performed without the removal of other
covers. However, operations such as soldering on
TOP COVER REMOVAL.
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).
CD,
b. Slide the cover forward allowing its forward
edge to enter the groove in the front panel.
c. Replace the two cover retaining screws.
Table 5-1. Test Equipment
Instrument
Type
Use
Critical Specifications
Instrument
Recommended
DC voltmeter
DC voltage measurement
Calibration accuracy
check
Range: 0.5 to 50 volts dc
Accuracy: ±0.2%
Resolution: three digit
ctiJ405BR/CR
Ohmmeter
Continuity & resistance
checks
Range: 1 ohm to 10 megohms
Accuracy: 5% of full scale
~410B
~412A
Precision
milliammeter or
Power Meter
Calibrator
Calibration accuracy
check
Milliammeter
Accuracy: 0.1% of
full scale
Range: o to 30 rna
Sensitive Research
Instrument Corp
Model B, Bamilek
Calibrator
Current accuracy:
0.1%
Resistance accuracy:
0.2%
~ 8402A Power
Milliammeter
Oscilloscope or
AC voltmeter
01370-1
Battery circuit check
Power supply ripple
check
10 kc oscillatoramplifier check
10 kc amplifier check
10 kc amplifier null
adjust
Range: 3 to 60 rna
Accuracy: 5%
Meter Calibrator
ctiJ 412A
~428A/B
Oscilloscope
Bandwidth: 100 kc
~ 130B/C
Accuracy: 5%
ctiJ 120B
Input impedance:
~122A
1 megohm
Sensitivity: 1 mw/cm
AC voltmeter
Accuracy: 5%
Input impedance:
1 megohm
Range: • 01 to 100 mv
ctiJ400D/H/L
~403A/B
5-1
Model 431B
Section V
Paragraphs 5-8 to 5-9
Table 5-1. Test Equipment (Cont'd)
Instrument
Type
Use
Critical Specifications
Instrument
Recommended
DC Source or
Power Meter
Calibrator
Calibration accuracy
check
Range: o to 220 vdc or
Current Output: o to 20 rna
~
Thermistor Mount
Completion of test
circuit
See table 1-2 for list of suitable
mounts
~478A,
Transformer to
Power supply regulation
check
Voltage Range: 103 to 127 vac
207 to 253 vac
Current Rating: 1 amp
General Radio
W5MT3A
Frequency
counter
10 kc oscillatoramplifier check
10 kc oscillator-amplifier frequency adjust
5 place readout
Min. input sensitivity: 4 v rms
Max. frequency: greater than 10 kc
Accuracy: better than 0.1%
~521C or
~5212A
~5512A
Variable
Transformer
Power supply adjustment
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: ± 1 volt
General Radio type
WI0MT3A
Soldering Iron
& Tips
Repair
Wattage rating: 50 watts
Min tip temp: 8000 F
Tip size O. D.: 1/16" to 3/32
Ungar #776 soldering iron handle
Ungar # PL333
tiplet
Ungar #854 Cup tip
Resistor
Charging checks
Value: 780 n
Accuracy: ± 1%
Wattage: 3 watts
Dale
Type RS-2
Resistor
Charging checks
Value: 7500 n
Accuracy: ± 1%
Wattage: 2 watts
Electra MF2, T-O
Decade
Resistance
Divider
Zero and vernier
control adjustment
Full scale accuracy adj
Range: 50 n to 50K n
Multiple: 10 n
Accuracy: 1% per decade
GR1432P Decade
Resistance Box
Precision
Resistor
Zero and vernier control
adjustment
Value: 1000 n
Accuracy: ± 0.1%
Wattage: 0.25 watts
Ultronex
Type 205A
Decade
Capacitors
Oscillator frequency
adjustment
Coarse null adjustment
Range: 10 to 1000 pf
Capacitance per step: .0001 /lfd
Accuracy: .1% per decade
General Radio
Type 1419-B
vary line voltage
5-8.
..
BOTTOM COVER REMOVAL.
a. Set the tilt stand as shown in figure 5-1.
b. Remove the two retaining screws at the rear of
the cover.
5-9.
711A, 712B
Power Supplies
8402A Power Meter
Calibrator
486A
E
BOTTOM COVER REPLACEMENT.
a. Set the tilt stand as shown in figure 5-1.
b. Rest the bottom cover flat on the cast guides
inward near the bottom of each side frame
(see ~ , figure 5-1).
projec~g
c. Slide the cover rearward far enough to free its
forward edge from the front foot assembly.
c. Slide the cover forward on the guides so that
the formed portion at the rear of the cover slides
over the two short pr*ctions at the rear corner of
each side frame (see ~,figure 5-1).
d. Tilt the forward edge of the cover upward and
d. Replace the two retaining screws and the rear
foot assembly.
lift the cover from the instrument.
5-2
01370-1
Model 431B
Section V
Paragraphs 5-10 to 5-18
5-10. SIDE COVER REMOVAL.
5-11. The side covers cannot be removed until the top
and bottom covers are off (see paragraphs 5-6 and 5-8).
Each side cover is held in place by four screws retained
by nuts which are not fastened to the side frames.
Note
Replace side covers before replacing either
the top or the bottom cover.
5-16. Table 5-2, Troubleshooting, and the follOWing
detailed tests are given to aid in correcting trouble
within the Model 431B. To make localizing of trouble
easier, the 431B circuitry is divided into five sections;
the power supply, the 10 kc oscillator-amplifier (including the rf bridge), the 10 kc amplifier (including
the metering bridge), the de metering and feedback
amplifiers, and the squaring circuit. Tests are given
for each of these sections.
5-17. THE POWER SUPPLY.
5-12. TEST EQUIPMENT.
5-13. Any instrument which satisfies the specifications
of table 5-1 can be used for the test described in this
maintenance section.
5-14. TROUBLESHOOTING.
5-15. The first step in troubleshooting the Model 431B
Power Meter should be isolation of trouble to the
thermistor mount and thermistor mount cable or to the
power meter itself. The thermistor match check in
the maintenance section of the ~ Operating Note pertaining to the thermistor mount in use will indicate a
defective thermistor or thermistors. A simple ohmmeter continuity check and inspection ofthe thermistor
mount cable and its connectors can be used to prove
the cable.
5-18. The de test point voltages shown on the power
supply schematic diagram, with two exceptions, apply
to instruments operated from either ac or battery primary power. Voltage limits shown at C1 and C2 apply
only to instruments operated from ac primary power.
Refer to figure 5- 2, Top View, for component location.
a. Connect Model 431B to a variable line transformer
and set transformer for 115 vac (or 230 vac).
b. Connect a de voltmeter (see table 5-1 for voltmeter 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 as above, test the
regulation of the power supply (for instruments
Table 5-2. Troubleshooting
Possible Cause
Trouble Indication
Null impossible
Thermistor mount
Thermistor mount cable
MOUNT RES switch
TI02
Meter does not indicate, does not zero but does null
QI06
Meter pointer drifts during readings
Thermistor mount
QI06, QI07
Thermistor mount in unstable thermal environment
RF source unstable
DC calibration/substitution source unstable
Oscillator -amplifier
10 kc amplifier
Interference from external 10 kc signal
Rotation of the ZERO or VERNIER control results
in erratic movement of the meter pointer on the
.01 MW range
ZERO or VERNIER potentiometer
Movement of the thermistor mount cable causes abrupt flicker of the meter pointer on the. 01 MW range
Thermistor mount
Thermistor mount cable
Meter pointer stays down scale
TI02
Thermistor mount
Thermistor mount cable
Power supply
Meter
RECORDER jack
QI06
CI02, CI0l
10 kc amplifier
01370-1
5-3
Section V
Paragraphs 5-19 to 5-24
Model 431B
Table 5-2. Troubleshooting (Cont'd)
Trouble Indication
Possible Cause
Meter pointer stays up scale
T102
Oscillator failure
Thermistor mount cable
Large unbalance in the metering bridge
C105
C104
10 kc amplifier failure
Calibration inaccurate, all power ranges
Thermistor mount in strong rf field
Interference from stray 10 kc signal
Thermistor mount
Meter not mechanically zero-set
Meter
MOUNT RES switch
Power supply
Battery
10 kc amplifier
Collector resistor R101
Q107, Q106
Q102
Calibration inaccuracy, NOT all power ranges
Resistors emitter Q107
Q106,
10 kc amplifier
Zero setting does not carryover from range to
range within specification
Q106
R141
Q104
operated from ac primary power) by varying the line
voltage ±10% about the nominal 115 or 230 vac. There
should be no perceptible variation of the -18 vdc.
d. If -18 volts cannot be obtained by adjustment of
R13, or if regulation is not satisfactory, proceed with
the following test to determine the causes:
(1) Use a dc voltmeter (see table 5-1) to check the
ac voltage limits at the points listed in table 5-3.
See figure 5-2, top view, for component.location. All voltages are measured with reference
to the Model 431B ground.
(2) Check ripple voltages (ac operation), using an
ac voltmeter or oscilloscope, at the points
listed in table 5-4. Table 5-1 gives requirements for the voltmeter or oscilloscope.
5-19. If the power meter does not function normally
(e.g., poi~ter driven to its limits, no power indication)
and power supply regulation is unsatisfactory, another
circuit area, such at the 10 kc oscillator-amplifier
or 10 kc amplifier, could be the cause.
5-20. A -18 vdc supply which is set high or low
causes calibration inaccuracy of the Model 431B.
5-21. 10-KC OSCILLATOR-AMPLIFIER CHECK.
5-22. Tests of the oscillator-amplifier should be made
according to the step sequence in which they appear
below.
A dc voltmeter, an ac voltmeter or oscilloscope and a frequency counter are needed for the
tests (see table 5-1 for test instrument specifications).
Figure 5-2, Top View, shows component location.'
5-4
5- 23. STEP 1.
a. Connect the oscilloscope between the positive
lead of C125 and ground, check the 10 kc oscillatoramplifier output amplitude and waveform. Output
amplitude, with a 200 ohm thermistor mount connected to the Model 431B, should be 15 vac ±20%
peak-to-peak.
If a 100-ohm mount is used, the
amplitude should be 8 vac ±20% peak-to-peak. The
waveform must be sinusoidal with only slight crossover distortion (caused by Q110 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. Connect the frequency counter between the positive lead
of C125 and ground. With Model 478A thermistor
mount connected to the Model 431B, the oscillatoramplifier frequency should be 9750-10,000 cps. With
a Model 486A thermistor mount connected, the frequency should be 10 kc ±50 cps.
5-24. STEP 2.
a. Connect the oscilloscope between the base of
Q108 and ground; observe the amplitude of the feedback signal to the oscillator-amplifier. It must be
less than 12 mv peak-to-peak: if not, 10 kc oscillatoramplifier gain is incorrect. The cause could be Q108,
Q109, C124, L101, L105 or T101. IfT101 is the cause
of trouble use a special soldering tip to remove it
from etched circuit board (see table 5-1).
01370-1
Model 431B
Section V
Tables 5-3, 5-4, 5-5
Table 5-3. Power Supply DC Voltage Checks
Test Point
DC Voltage Limits
Voltage Out of Limits, Check
Minus end of C1
-38
to -43
ac line voltage, CR1, CR4, C1
Minus end of C2
-24
to -27
ac line vo ltage , CR2, CR3, C2, battery
Anode of CR8
-10.7 to -12.3
CR8
Anode of CR7
- 6.0 to - 7.5
CR7, Q3
Minus end of C6
-18
R13, Q5, Q2
Base of Q1
-18.3 to -18.6
Q1, Q3, Q2, CR7
Anode of CR9
-24.0 to -25.6
CR9, POWER switch
Plus end of C1
+ 1.4 to +1.5
CR5, CR6
Table 5-4. Power Supply Ripple Checks
AC Voltage Limits
Test Point
Voltage Out of Limits, Check
Peak-to-Peak
R.M.S.
Minus end of C1
1. 8 v max.
Minus end of C2
1.1 v max.
Minus end of C6
10.6 mv max.
,
5 v max.
CR1, CR4, C1
3 v max.
CR2, CR3, C2, C6, Q13
30 mv max.
Q1 to Q5, CR7, CR15, C2, C6
Table 5-5. 10 KC Oscillator-Amplifier DC Voltage Checks
Test Point
DC Voltage Limits
Voltage Out of Limits, Check
Collector of Q110
-18
Power Supply
Emitter of Q109
-10.0 to -14.0
Q108, Q109, C122, C121
Minus end of C121
- 5.0 to - 6.5
C121, Q108, R153
Table 5-6. 10 KC Amplifier DC Voltage Checks
DC Voltage Limits
Test Point
Voltage Out of Limits, Check
Emitter of QI01
-1. 5 to -2.5
Cl12, Rl16, Rl15, CliO, Q101
Collector of Q101
-4.5 to -6.0
Q101, Cl13, Rl17 to R124
Positive end of Cl16*
-3.5 to -4.5
Q103, R132, Q102, Cl15
* Short base to emitter of QIOI
Table 5-7. DC Voltages in Squaring Circuit
Test Point
DC Voltage Limits
Voltage Out of Limits, Check
Cathode CRl13
+ 10.30 to + 10.46
CRl13, R167, R173
Cathode CR112
+ 8. 50 to + 9. 64
CR112, R174, R168
Cathode CRill
+ 6.41 to + 6.51
CR111, R175, R169
. Cathode CRI10
Cathode CR109
Cathode CR108
01370-1
-
+ 4.39 to + 4.47
CR110, R176, R170
+ 2. 48 to + 2. 52
CRI09, R177, R171
0
CRI08, CR109 to CRl13
5-5
Section V
Paragraphs 5- 25
Model 431B
POWER
SUPPLY
RI79
DC METERING AND
FEEDBACK CIRCUITS
RI3
-18V REG. ADJ.
BATTERY
TERMINALS
SYNCHRONOUS
DETECTOR
RI41
IOKC
OSC/AMP
AND
RF BRIDGE
IOKC
AMPLIFIERS
AND
METERING BRIDGE
LIOI
CI05
CIOI
CI04
SQUARING
CIRCUIT
L102
MP-S-1149
Figure 5- 2. Top View
b. Using the dc voltmeter, make dc measurements
at the points listed in table 5-5. If the presence of
10 kc signal interferes with the dc measurements, the
10 kc oscillator can be disabled, without appreciably
affecting the dc voltages, by grounding the collector
of Q109. DC voltages are measured with reference
to the Model 431B ground.
5-25. STEP 3. If there is no 10 kc output from the
oscillator-amplifier proceed as follows:
a. Disconnect the thermistor mount.
5-6
b. Disconnect the positive lead of C125 from the
circuit board.
c. Make a direct connection between the positive
lead of C125 and bridge side of C120 (terminal 35 on
the underside of the circuit board).
d. Using the oscilloscope, monitor the output of the
oscillator-amplifier. If oscillation is present, the
metering and rf bridges should be examined for defect.
The waveform of the oscillation under this condition
may show limiting.
01370-1
Section V
Paragraphs 5-26 to 5-43
Model 431B
5- 26. If component replacement is required as a
result of the foregoing tests, note the following:
a. After replacement of Q110 or Q111, check the
amplitude of the 10 kc oscillator-amplifier output
(paragraph 5-23a).
b. If Q108 or Q109 has been replaced, check the output frequency of the oscillator-amplifier (para. 5-23b).
c. After replacement of L105 or 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 are needed for
checking the 10 kc amplifier. Table 5-1, Test Equipment, gives equipment requirements. Refer to figure
5-2, Top View, for component location.
5-29. Table 5-6 lists dc voltage check points and
possible causes for deviations from the given limits.
All voltages are 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 resistor in the collector
of Q101 or a defect in the Q102 stage, which results
in improper gain, will produce calibration error.
5-31. An open signal path or very low gain in the 10-kc
amplifier can drive the meter pointer to its downscale
limit. For signal tracing, the 10 kc error signal from
the metering bridge can be used, or C110 can be disconnected and used as a means of injecting a substitute
10 kc test signal.
5-36. The squaring circuit is tested under two conditions: (1) when all diodes are conducting, and (2) when
no diodes are conducting. Both conditions should be
used whenever the squaring circuit is tested.
5-37. A digital voltmeter (see table 5-1) for specifications) is recommended for the following measurements..
5-38. DIODES CONDUCTING.
The following procedure 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
scale deflection of the meter pointer.
b. Disconnect the grounding link at the digital voltmeter input, and measure the voltage drop across the
individual diodes of the squaring circuit. The requirement is 0.4 to 0.5 vdc.
5-39. DIODES OFF. The test points listed in table
5-7 are the midpoints of five two-resistor voltage
dividers connected between -18 vdc and ground. This
check verifies that each diode is properly back biased.
a. Adjust the Model 431B ZERO control for a belowzero deflection of the meter pointer.
b. Connect the voltmeter (ungrounded input) between the regulated -18 vdc supply and the test points
listed in table 5-7. The voltmeter readings should be
within the limits specified in the table.
Note
A special soldering tip is required to replace
transformer T 102. Refer to table 5-1 for the
type of soldering tip to be used.
5-32. METERING AND FEEDBACK CIRCUIT.
5- 33. Before performing this procedure refer to paragraphs 5-69 and 5-70 and check values of R141 and
R179. The differential amplifier (Q104 and Q105), the
feedback current squared generator (Q106), the feedback 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 are selected for
optimum calibration accuracy. If Q106 or
Q107 is replaced, check calibration accuracy
using procedure given in paragraph 5-76 or
5-78. It may be necessary to try 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 or tracking accuracy of the Model 431B does
not meet specifications. The squaring circuit includes
CR108 through CRl13 and R167 through R177. Figure
5-2, Top View, shows component location.
01370-1
5-40. BATTERY AND CHARGING CHECKS.
5-41. The information and procedures which follow
pertain to power meters having the optional nickel
cadmium battery. The battery is an assembly of 20
individual, permanently sealed cells connected in
series.
At full charge, battery terminal voltage
should be 27 volts ±1 volt. An inoperative cell reduces
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 sure that the Model 431B is disconnected
from the ac 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 to -27 volts. If it is not, and the battery has
been charged, check the charging circuits and the
current drain imposed by the Model 431B circuitry.
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.
5-7
Model 431B
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 if 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.
5-50. BATTERY WARRANTY.
5-51. The warranty, appearing on the inside of the
rear cover of this manual, also applies to the accessory battery (option 01). Within the warranty period,
the battery may be returned to ~ Customer Service
for repair or replacement.
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 mao
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 5-1), a 7500 ohm±1%, 2 watt
resistor and a 780 ohm ±1%, 3 watt resistor are required for these tests. The battery is 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 when the 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.
5-52. REPAIR.
5-53. The etched circuit board used in the Model 431B
is of the plated-through type which consists of a base
board and conductor. The board does not include
funneled eyelets. The conductor material is 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 or component side
of the board with equally good results. The rules given
below should be followed when repairing a platedthrough 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 as potentiometers, transformers, etc. Refer to table 5-1 for type of soldering
tip required.
d. Use a toothpick to free hole of solder before installing a new component.
b. Connect the current meter to monitor the current
through the resistor.
5-54. MECHANICAL ADJUSTMENT OF
METER ZERO.
c. Connect the Model 431B to the ac line, se~t the
POWER switch to AC, and observe the reading of the
current meter. Trickle-charge current should be 3.2
to 4.8 mao
5-55. When meter is properly zero-set, pointer rests
over the zero calibration mark on the meter scale
when the instrument is 1) at normal operating temperature, 2) in its normal operating position, and 3)
turned off. Zero-set as follows to obtain best accuracy and mechanical stability:
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 mao
5-49. A battery which will not assume rated terminal
voltage with proper charging current may have a defective cell or cells. In such cases the battery must
be replaced (see section VI Table of Replaceable
Parts).
5-8
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.
01370-1
Section V
Paragraphs 5-56 to 5-68
Model 431B
5-56. ADJUSTMENTS.
5-63. COARSE NULL ADJUSTMENT.
5-57. POWER SUPPLY ADJUSTMENT.
5-64. If both 100 and 200 ohm thermistor mounts are
to 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.
a. Connect a de voltmeter (see table 5-1 for reqUired 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 are
to be used 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 are
needed for these adjustments. See table 5-1, Test
Equipment for requirement. A plastic alignment tool
should be used for the adjustment of L101 to 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.
5-65. If only a 200 ohm thermistor mount is to be used
with the power meter, follow the procedure of paragraph 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 or ac vtvm is needed for these
adjustments.
See table 5-1, Test Equipment, for
requirements. A plastic alignment tool should be
used for the adjustment of L102 to avoid core damage.
5-67. 100 OHM MOUNT. The following procedure is
used to make coarse adjustment of the null when a 100
ohm thermistor mount is connected to the Model 431B.
a. Set MOUNT RES to 100 n.
b. Observe the arrangement and travel of null
capacitor C103, then mechanically center C103.
c. Connect the oscilloscope or ac vtvm between
ground and the base of Q103.
d. Switch the Model 431B on and set RANGE to
10 MW.
a. Connect the 200 n thermistor mount and cable to
the Model 431B; set the MOUNT RES switch to 200 n.
e. Adjust the ZERO control to maintain a meter
indication of less than 5% of full scale on the Model
431B while adjusting L102 for a minimum indication
on the oscilloscope or vtvm.
b. Connect the frequency counter between the plus
end of C125 and ground; adjust L101 to give a frequency
of 10,150 cps.
f. Set RANGE to .01 MW and repeat step e, this
time maintaining an on-scale meter indication on the
Model 431B.
c. Connect the oscilloscope to the base of Q108 and
observe the feedback signal amplitude. It should not
exceed 12 mv peak-to-peak.
g. Move the oscilloscope or vtvm connection from
the base of Q103 to the lead of R138 nearest T1.o3.
5-62. 100 OHM MOUNT. The following procedure
adjusts the 10 kc oscillator frequency when a 100 ohm
thermistor mount is connected to the Model 431B.
h. Adjust null capacitor C103 to minimize the
oscilloscope or vtvm indication. Minimum indication
should occur with the capacitor near the center of its
range.
Note
a. Connect the 100 ohm thermistor mount and cable
to the Model 431B, and set MOUNT RES to 100 n.
b. Connect the frequency counter between the positive end of C125 and ground. The frequency should be
10 KC ±50 cps. If it is not, proceed with step c.
c. Substitute values of capacitance for C101 until
the frequency is within the limits of step b.
Note
A decade capacitance box can be used to determine proper value of capacitance that must
De used (see table 5-1).
01370-1
A decade capacitance box can be used to determine the value of capacitance to be added
(refer to table 5-1).
1. Set Model 431B RANGE switch to NULL. Adjust
the null capacitor, C103, for a minimum indication on
the Model 431B meter. Minimum indication should
occur at less than 4% of full scale and C103 should be
near its mid-range.
5-68. 200 OHM. The following procedure is used to
make coarse null full adjustment when a 200 ohm
thermistor mount is connected to the Model 431B.
a. Set MOUNT RES to 200
n.
5-9
Section V
Paragraphs 5-69 to 5-74
b. Set RANGE to .01 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 its rotor plates.
e. Using the ZERO and VERNIER controls, maintain
an on-scale indication on the Model 431B meter while
substituting values for C105 to obtain a minimum
indication on the oscilloscope or vtvm.
f. Adjust C103, the null capacitor, to improve the
minimum indication on the oscilloscope or vtvm. The
null capacitor should be near mid-range.
Model 431B
b. Set Model 431B RANGE to 10 MW; set Model
8402A RANGE (MW) to 10 MW, and FUNCTION to CAL.
c. Adjust the Model 431B ZERO and VERNIER
controls for a zero indication on the meter.
d. Set Model 8402A OUTPUT CURRENT to ON;
note and record the Model 431B percent-of-powerreading error.
e. Set Model 8402A OUTPUT CURRENT to off.
f. Set Model 431B RANGE to 3 MW; set Model
8402A RANGE (MW) to 3 MW.
g. Reset Model 431B VERNIER to zero the meter,
if necessary.
Note
A decade capacitance box can be used to determine the value of capacitance to be added
(see table 5-1).
g. Set RANGE to NULL. The Model 431B meter
deflection should be less than 4% of full scale. If it is
not, increase the value of C104 in approximately 50 pf
increments to a maximum value of 500 pf. If 100 and
200 ohm thermistor mounts are to be used, repeat the
null procedure for 100 ohm mounts (paragraph 5-67)
after each increase in capacitance of C104.
h. Set Model 8402A OUTPUT CURRENT to ON;
note and record the Model 431B percent-of-powerreading error (1. 7%/division on 0-3 meter scale).
i. Repeat steps b through h for all Model 431B
RANGE positions.
j. Connect a decade resistance box across R179
(see figure 5-2).
k. Select the resistance value which equalizes the
magnitude of the largest positive and negative percent
error.
5-69. ZERO AND VERNIER CONTROL ADJUSTMENT.
a. Connect a de digital voltmeter (see table 5-1) at
the Model 431B RECORDER jack. Use a special
telephone-plug-to-dual-banana-plug cable assembly
terminated with a 1000-ohm ±0.1% 0.25-watt wirewound resistor.
b. Set Model 431B RANGE to .01 MW, and adjust
Model 431B ZERO and VERNIER controls for zero
meter reading on the Model 431B.
c. Set Model 431B RANGE to 10 MW.
d. Connect a decade resistance box across R141
(see figure 5-2), and adjust to obtain zero indication
on Model 431B Power Meter.
e. Note amount of resistance required from resistance box to obtain zero 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
m. Remove the decade resistance box, and replace
with a resistor of the value selected in step k.
n. Check all Model 431B RANGE positions. Test
limits. The Model 431B full-scale power-reading
error must not exceed 1-1/2% on all range positions.
Note
When only a 100 ohm thermistor mount will be
used with the Model 431B, the value of C104
may be changed to obtain the null requirements
specified above.
5-71. PERFORMANCE CHECK.
5-72. The tests described below which verify that the
Model 431B meets specifications, use only panel controls and connectors. These tests can be used for incoming quality control, for routine preventive maintenance, and after repair. A thermistor mount must be
connected to the Model 431B for the performance
checks, though no rf power will be applied.
by 1) setting Model 431B RANGE to .01 MW, and re-
adjusting its VERNIER for zero meter reading, 2)
switching the Model 431B through its complete range
while observing the digital de voltmeter reading. Test
limits: digital de voltmeter reading must not exceed
+5 mv (+0.005V) on any Model 431B range.
5-70. FULL SCALE ACCURACY ADJUSTMENT.
a. Connect a ~ Model 8402A (see table 5-1) at the
Model 431B POWER METER terminals. Check that
Model 8402A OUTPUT CURRENT is off.
5-10
Note
If there is possibility of rf pick-up, the ther-
mistor mount
shielded.
should
be
appropriately
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 .01 MW.
01370-1
Model 431B
Section V
Paragraphs 5-75 to 5-80
b. Adjust ZERO and VERNIER controls to set the
meter pointer over the zero calibration mark.
c. Rotate RANGE through its .03, .1, .3, and 10
MW positions, observing the accuracy of the zero
setting at each position. The zero must carryover
from range to range within ±1 % 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 at 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 calibration error. The ~ Model 8402A Power Meter
Calibrator, or other means of producing accurate
direct currents, is used as the substitution source.
5-77 . CALIBRATION AND TRACKING ACCURACY
TEST USING THE ~ MODEL 8402A POWER METER
CALIBRATOR. The Model 8402A Power Meter Calibrator 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 test procedure.
5-79. ALTERNATE METHOD FOR CHECKING CALIBRATION AND RANGE TRACKING ACCURACY. The
calibration and range tracking accuracy of the Model
431B can be checked by dc substitution using the equipment and connections shown in figure 3-3.
5-80. Using the data in table 5-8 the full scale calibration accuracy of each range and the tracking
accuracy of the 10 mw range can be tested.
Table 5-8. Data for Calibration, Tracking Accuracy Check
Test Point
Full
Scale
Tracking
Substitution Current (lcic)
Mount Res
100 0
Mount Res
200 0
Model 431B Meter Reads
-
10mw
8 mw
6mw
4mw
2 mw
3 mw
1 mw
.3 mw
.1 mw
.03 mw
.01 mw
01370-1
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
7.76
5.82
3.88
1. 94
2.91
0.97
0.291
0.097
0.0291
0.0097
to 10.3 mw
to 8.24 mw
to 6.18 mw
to 4.12 mw
to 2.06 mw
to 3.09 mw
to 1.03 mw
to 0.309 mw
to 0.103 mw
to 0.0309 mw
to 0.0103 mw
5-11
Model 431B
Section V
Figure 5-3
WAVEGUIDE
THERMAL
CONDUCTING
BLOCK
Model 431B
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-
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RI23
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OPTION OPTION OPTIONS OPTIONS OPTION
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5-12
J
---
PAGE IOF 2
01370-1
01370-1
AIOI
POWER
METER
ASSI
Model 431B
Section V
Figure 5-3
,.- - - - - - - - - ... - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - , - - - - - - - - - - - - T - - - - - -
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4. ALL VALUES IN OHMS AND
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OTHERWISE INDICATED.
SIOI,IO
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POTENTIOMETER
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(UNREG)
-
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10KC
10KC ERROR SIGNAL
8.
* VALUE
SELECTED AT FACTORY
AVERAGE VALUE SHOWN
9
D VOLTAGE MEASURED WITH
RESPECT TO -18V REG.
II
COPYRIGHT 1962 BY HEWLETT- PACKARD COMPANY
. , 8- PWR. METER - 2218C
I
Ii?
-
I
I
GROUND ON THE PRINTED
CIRCUIT BOARD.
5. r----1 FRONT PANEL
L....-..-J ENGRAVING
-
n'1
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L101-10~
0105
: RI43
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3300
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E
=--=.~~~.~I~~-.
.
2.
T104
B
.\!::
BI'L: C
I
I. DC VOLTAGE LIMITS AT
VARIOUS POINTS OF THE
CIRCUIT ARE EXPRESSED AS
FRACTIONS.
A THERMISTOR MOUNT IS
CONNECTED TO THE 431B
FOR THESE MEASUREMENTS.
JI0I,I02, 103
DIFFERENTIAL
AMPLIFIER
RI22
24K
DESIGNATORS
~, CRI06
R141*
22K
0104
C
NOTES:
REFERENCE
...
RII1
430
0101
2NI310
t
RI71
56K
i
I
I
JI02
~[C9[D]Bj
n
0--
CRI07
DC FEEDBACK
I
1ST IOKC
AMPLIFIER
I
I
14
1-
CIII:::: b'10UF ""'+
RII4
3300
!,
I
-9.0V
( -6.0V
RII3
1500
I I
RI70
46.61K
RI65
21.36K
r------------------------------------
!
t9.64VD"~
OV 0 L..--Ie".
.....f --......_
CRI08
C
RI13
51.46K
CRII3
1"/1
-
~~~
t 10.30V
RI68
63.14K
RI12
52.3K
-!
~10.46VO
-
82.09K
RI64
12K
I
I
~
C
-
t
I
I
~E
CI23
.41UF
-14.0V
-IO.OV
2.5MH
SI02
-18V
0110/0111
2N383/2N1304
-IO.OV
~I- C
CI20
.41UF
EMITTER
FOLLOWER
rh
- - - - - - -.. .....
1
INPUT
~~ AMPLIFIER
-
f6~~
-,~
R~6~
RI60
1194
---------1
J
AIOI
POWER
METER
ASSEMBLY
Figure 5-3. Power Meter Assembly
01370-1
5-13
"'%jCll
CJ1
I
....
..... (1)
~§:
t1 0
(I) ::s
~
~<
~
P2
~Q~E}l~
I
JI
I
GRN
BLK-RED
I
1.!lV UNREG
-43V
( -38V
33
1.8Vrms
MAX.
CRI
CI
20UF
tl.!lV I
tl.3V
CR6
CR!I
R6
270
~i](~~QA.9"l~
II!1V
CR7
RI2
10K
R!I
4700
:
01 FFERENTIAL
AMPLIFIER
C3
.0IUF
230V
Q4/Q!I
2NI304/1854-0003
::::I .-.
+...L.C2
-'T'IOOUF
ItS
+.,LC6
-'1'!lOUF
~~~o
10.6MVrms
MAX.
FI
CR3
AC
1.IVrms
MAX.
\::QY
RI4
4700
-24V
8
CHARGE
BATTERY+
------------------i 0
I S2
: !POWER
-18V REG
23
~
CR4
-2!1V UNREG
I
o
o
---------------1
I
IBATTERY I
8ATTERY-
:I
21
I
I
I
I
I
I
I
:
J
R4
1200
R2
3300
I
o
2!1
o
R3
390
I
26
28
NOTES:
18ATTERY!
@illl @ ~ I!CHARGEJ
o
(!>
THE UPPER AND LOWER
DC VOLTAGE LIMITS AT
VARIOUS POINTS OF THE
CIRCUIT ARE EXPRESSED
AS FRACTIONS
A THERMISTOR MOUNT IS
CONNECTED TO THE 4318
FOR THESE MEASUREMENTS.
0
---------------- ..
I
I
~
L
I
REFERENCE
DESIGNATORS
8T1
CI-6
PI,2
QI-!I
CRI-9
RI-7,9-14
51,2
2.
TI
ZI
3.
DSI
FI
JI
I
4.
m
*
GROUND ON THE PRINTED
CIRCUIT 80ARD.
CHASSIS GROUND.
, - - - - , FRONT PANEL
L..--..J ENGRAVING.
r---"
.. -
COPYRIGHT Ige2 BY HEWLETT-PACKARO COMPANY
4]18-P .... SU'PLY-
22IICD
-
_..J
REAR PANEL
ENGRAVING.
!I.
®
SCR~WDRIVER ADJUSTMENT.
6.
0
ROTARY SWITCH
o....
~.....
~
W
(I)
C/O
o
....
I
~
Figure 5-4. Power Supply
....
~
Section VI
Paragraphs 6-1 to 6-7
Model 43lB
SECTION VI
REPLACEABLE PARTS
6-1. INTRODUCTION.
6-4. ORDERING INFORMATION.
6- 2. This section contains information for ordering
replacement parts. Table 6-1 lists parts in alphanumerical order of their reference designators and
indicates the description and rffffi stock number of each
part, together with any applicable notes. Table 6- 2
lists parts in alpha-numerical order of their rffffi stock
numbers and provides the following information on
each part:
6-5. To order a replacement part, address order or
inquiry either to your authorized Hewlett-Packard
sales representative or to
a. Description of the part (see list of abbreviations
below).
CUSTOMER SERVICE
Hewlett-Packard Company
395 Page Mill Road
Palo Alto, California
or, in Western Europe, to
Hewlett-Packard S.A.
54-54bis Route des Acacias
Geneva, Switzerland
b. Typical manufacturer of the part in a five-digit
code; see list of manufacturers in appendix.
6-6.
c. Manufacturer's stock number.
Specify the following information for each part:
a. Model and complete serial number of instrument.
d. Total quantity used in the instrument (TQ column).
b. Hewlett-Packard stock number.
c. Circuit reference designator.
e. Recommended spare part quantity for complete
maintenance during one year of isolated service
(RS column).
6-3. Miscellaneous parts not indexed in table 6-1 are
listed at the end of table 6- 2.
d. Description.
6-7. To order a part not listed in tables 6-1 and 6- 2,
give a complete description of the part and include its
function and location.
REFERENCE DESIGNATORS
A
B
C
CR
DL
DS
E
=
=
=
=
=
=
assembly
motor
capacitor
diode
delay line
device signaling (lamp)
= misc electronic part
F
FL
J
K
L
M
MP
= fuse
P
= plug
=
=
=
=
=
=
Q
=
=
=
=
=
filter
jack
relay
inductor
meter
mechanical part
R
RT
S
T
transistor
resistor
thermistor
switch
transformer
v
= vacuum tube, neon
Wlb, photocell, etc.
w = cable
X
= socket
XF = fuseholder
XDS = lampholder
Z
= network
ABBREVIATIONS
A
= amperes
BP
= bandpass
BWO = backward wave
oscillator
CER =
CMO =
COEF=
COM =
COMP=
CONN =
CRT =
ceramic
cabinet mount only
coefficient
common
composition
connection
cathode-ray tube
DEPC= deposited carbon
EIA
In
= Tubes or transistors
meeting Electronic
Industries' Association standards will
normally result in
instrument operating
within specifications;
tubes and transistors
selected for best
performance will be
supplied if ordered
by ~ stock numbers.
~
:::
c
ELECT = electrolytic
ENCAP = encapsulated
01370-1
F
FXD
GE
GL
GRD
H
HG
HR
= farads
= fixed
= germanium
= glass
= ground(ed)
= henries
= mercury
= hour(s)
INS
= impregnated
= incandescent
= insulation ( ed)
K
= kilo = 1000
LIN
LOG
= linear taper
= logarithmic taper
IMPG
!NCD
6
M
= meg = 10
MA
= milliamperes
MINAT = miniature
METFLM= metal film
MFR
= manufacturer
MTG = mounting
MY = mylar
=
=
=
=
normally closed
neon
normally open
negative positive zero
(zero temperature
coefficient)
NSR = not separately
replaceable
NC
NE
NO
NPO
OBD = order by description
P
PC
= peak
= printed circuit
board
PF
= picofarads =
10- 12 farads
PP = peak-ta-peak
PIV = peak inverse
voltage
FOR = porcelain
POS = position(s)
POLY= polystyrene
POT = potentiometer
RECT=
ROT =
RMS =
RMO =
rectifier
rotary
root- mean- square
rack mount only
S- B = slow -blow
SE
= selenium
SECT= section(s)
SI
= silicon
SIL = silver
SL = slide
TA = tantalum
TD = time delay
TI
= titanium dioxide
TOG = toggle
TOL = tolerance
TRIM = trimmer
TWT = traveling wave tube
U
= micro = 10VAC = vacuum
VAR = variable
wi = with
W
= watts
WW = wirewound
wlo = without
6
•
= optimum value
i
selected at factory,
average value
shown (part may
be omitted)
= number
6-1
Model 431B
Section VI
Table 6-1
Table 6-1. Index by Reference Designator
Circuit
Reference
A101
~ Stock No.
431B-65A
Note
Description #
Assy, etched circuit, includes:
R102, Rl03
C1 thru C6
R105 thru R110
C102, C106
Rl13 thru Rl16
C110 thru C125
Rl25
thru R140
CR1 thru CR9
R142 thru Rl44
CRl01 thru CRl13
R150 thru R155
L101 thru L105
R167 thru Rl78
Q1 thru Q5
R180
Q101 thru Q111
Zl
R2 thru R7
R9 thru R14
See Option 01
BTl
fxd,
fxd,
fxd,
fxd,
fxd,
aluminum elect, 20JLf, 50 vdcw
aluminum elect, 100JLf +100%-10%, 40 vdcw
cer, O.OlJLf ±20%, 1000 vdcw
cer, 0.47JLf+80%-20%, 25 vdcw
elect, 10JLf +100%-10%, 25 vdcw
C1
C2
C3
C4
C5
0180-0049
0180-0138
0150-0012
0160-0174
0180-0059
C:
C:
C:
C:
C:
C6
C7 thru C100
C101
C102
C103
0180-0105
C: fxd, aluminum elect, 50JLf, 25 vdcw
Not assigned
C: fxd, mica, 200*pf ±1%, 300 vdcw
C: fxd, mica, 2100pf ±1%, 300 vdcw
C: var, air, 7.2 - 143. 7pf
0140-0220
0160-0185
0121-0035
C104
C105
C106
C107 thru C109
C110
0160-0174
C: fxd, mica, 47*pf ±5%, 500 vdcw
C: bCd, mica, 200*pf ±1%, 300 vdcw
C: fxd, tantalum elect, 60JLf ±20%, 6 vdcw
Not assigned
C: fxd, cer, 0.47JLf+80%
C111
Cl12
Cl13
Cl14
Cl15
0180-0059
0170-0069
0160-0174
0180-0059
0170-0069
C:
C:
C:
C:
C:
Cl16
Cl17
Cl18, Cl19
0180-0059
0160-0105
0180-0105
C: fxd, elect, 10JLf + 100%-10%, 25 vdcw
C: fxd, cer, 0.47JLf +80%-20%, 25 vdcw
C: :fxd, aluminum elect, 50JLf, 25 vdcw
0140-0204
0140-0220
0180-0106
fxd,
fxd,
fxd,
fxd,
fxd,
elect, 10J,tf +100%-10%, 25 vdcw
poly, O.lJ,tf ±2%, 50 vdcw
cer, O. 47J,tf +80%-20%, 25 vdcw
elect, 10JLf +100%-10%, 25 vdcw
poly, 0 .1JLf ±2%, 50 vdcw
# See introduction to this section
6-2
01370-1
Section VI
Table 6-1
Model 431B
Table 6-1. Index by Reference Designator (Cont'd)
Circuit
Reference
0jJ
Stock No.
Description #
C120
C121, C122
C123
C124
C125
0160-0174
0180-0059
0160-0174
0170-0069
0180-0049
C:
C:
C:
C:
C:
fxd,
fxd,
fxd,
fxd,
fxd,
CRl thru CR4
CRS, CR6
CR7
CR8
CR9
1901-0025
1901-0026
1902-0017
1902-0018
1902-0017
Diode,
Diode,
Diode,
Diode,
Diode,
cer, 0.47J.Lf+80%-20%, 25 vdcw
elect, 10J.LI + 100%-10%, 25 vdcw
cer, 0.47J.Lf+80%-20%, 25 vdcw
poly, o. 1J.Lf ±2%, 50 vdcw
aluminum elect, 20J.Lf, 50 vdcw
Si.: 50 ma @t-1V, 100 PIV
Si.
81: avalanche
Si.: avalanche, 1N941
Si: avalanche
CRlO thru
CRlOO
CRl01 thru
CRl04
CRl05, CR106
CRl07 thru
CRl13
1910-0016
1901-0025
Diode, Ge: 100 ma @ lV, 60 PIV
Diode, Si.: 50 ma @ +1V, 100 PIV
1901-0024
Diode, 81
DSl
1450-0048
Lamp, Ne: NE2H
F1
2100-0017
Fuse, cartridge: 0.15 amp
J1
J2 thru J100
J101
J102
J103
1251-0148
AC-10C
AC-10D
AC-54A
AC-54A-1
Connector, POWER: male, 3 pin
Not assigned
Connector, female, 6 contact
Jack, telephone, for 2 connector plug
DC CALffiRATION and SUBSTITUTION, consists of
Binding post: black
Binding post: red
Insulator: black, 2 hole (inside)
Insulator: black, 2 hole (outside)
9140-0122
9110-0040
Nsr: part of Zl
Not assigned
Coil, var, 2 windings, 9-20J.Lh each
Inductor, audio, 2.5nih
431B-81A
Not assigned
Meter, calibrated
L1
L2 thru L100
L101, L102
L103 thru L105
M1 thru M100
M101
Note
Not assigned
1251-0149
1251-0066
# See introduction to this section
01370-1
6-3
Model 431B
section VI
Table 6-1
Table 6-1. Index by Reference Designator (Cont'd)
Circuit
Reference
@f) Stock No.
Note
Description #
Nsr; prat of W1
Nsr; part of W1
P1
P2
Ge: 2N1370
2Nl183
Ge, 2Nl370
Ge: 2N1304
Si
Q1
Q2
Q3
Q4
Q5
1850-0065
1850-0064
1850-0065
1851-0017
1854-0003
Transistor,
Transistor:
Transistor:
Transistor,
Transistor,
Ql thru Q100
Q101
Q102
Q103 thru Q105
Q106, Q107
1850-0065
1851-0017
1850-0065
1854-0003
Not assigned
Trans istor: Ge, 2N1370
Transistor, Ge: 2N1304
Transistor, Ge: 2Nl370
Transistor, Si
Q108
Q109
Q110
Q111
1850-0065
1851-0017
1850-0040
1851-0017
Transistor,
Transistor,
Transistor:
Transistor,
Rl
R2
R3
R4
R5
0687-3331
0687-3321
0690-3911
0690-1221
0687-4721
R:
R:
R:
R:
R:
R6
R7
R8
R9
R10
0687-2711
0687-3321
R: fxd, comp, 270 ohms ±10%, 1/2W
R: ~d, comp, 3.3K ohms ±10%, 1/2W
Nsr; part of Z1
R: fxd, comp, 4.7K ohms ±10%, 1/2W
R: fxd, comp, 3.3K ohms ±10%, 1/2W
0687-4721
0687-3321
fxd,
fxd,
fxd,
fxd,
fxd,
Ge: 2N 1370
Ge: 2N1304
2N383
Ge: 2N1304
comp,
comp,
comp,
comp,
comp,
33K ohms ±10%, 1/2W
3.3K ohms ±10%, 1/2W
390 ohms ±10%, 1W
1.2K ohms ±10%, 1W
4.7K ohms ±10%, 1/2W
R11
R12
R13
R14
R15 thru R100
0687-1821
0758-0006
2100-0182
0758-0005
R: fxd, comp, 1. 8K ohms ±10%, 1/2W
R: fxd, metallic oxide, 10K ohms ±5%, 0.5W
R: var, comp, lin, 3. 3K ohms ±10%, 1/3W
R: fxd, metallic oxide, 4.7K ohms ±5%, 0.5W
Not assigned
R101
Option 10
Option 11
Option 12
0727-0395
0727-0483
0727-0484
0727-0485
R:
R:
R:
R:
I
fxd,
fxd,
fxd,
fxd,
dep
dep
dep
dep
c,
c,
c,
c,
316 ohms ±1/2%,
318.1 ohms ±1%,
320.1 ohms ±1%,
323.4 ohms ±1%,
1/2W
1!2W
1/2W
1/2W
I
# See introduction to this section
6-4
01370-1
Model 431B
•
Section VI
Table 6-1
Table 6-1. Index by Reference Designator (Cont'd)
Circuit
Reference
~ Stock No.
Option 21-23
0727- 0486
R: fxd, dep c, 329.8 ohms ±1%, 1/2W
10
11, 21
12,22
13,23
0811-0051
0811-0100
0811-0085
0811-0086
0811-0087
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
ww,
ww,
ww,
ww,
ww,
200.3
200.7
202.5
204.3
208. 8
ohms
ohms
ohms
ohms
ohms
±O.l%,
±O.l%,
±O.l%,
±O.l%,
±O. 1%,
1/4W
1/4W
1/4W
1/4W
1/4W
10
11,21
12,22
13,23
0811-0051
0811-0099
0811-0088
0811-0089
0811-0090
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
ww,
ww,
ww,
ww,
ww,
200.3
202.5
206.6
213.5
227.6
ohms
ohms
ohms
ohms
ohms
±O.l%,
±O.l%,
±O.l%,
±O.l%,
±O.l%,
1/4W
1/4W
1/4W
1/4W
1/4W
Rl05
Option 10
Option 11, 21
Option12 , 22
Option 13,23
0811-0063
0811-0094
0811-0095
0811-0096
0811-0101
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
ww,
ww,
ww,
ww,
ww,
189 ohms ±O. 5%, 1/4W
190.9 ohms ±O. 5%, 1/4W
194.2 ohms ±O. 5%, 1/4W
200.7 ohms ±O. 5%, 1/4W
212.7 ohms ±O. 5%, 1/4W
R106
Option
Option
Option
Option
0811-0064
0811-0091
0811-0098
0811-0092
0811-0093
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
ww,
ww,
ww,
ww,
ww,
255 ohms ±O. 5%, O. 25W
256 ohms ±O. 5%, O. 25W
258.2 ohms ±O. 5%, 0.25W
262.1 ohms ±O.5%, O. 25W
265.5 ohms ±O. 5%, 0.25W
R107
R108
RI09
0811-0065
0811-0066
0758-0020
R: fxd, ww, 511 ohms ±1%, 0.08W
R: fxd, ww, 887 ohms ±1%, 0.08W
R: fxd, mfgl, 22K ohms ±5%, 1/2W
Rl10
Rl11A/B
0811-0065
2100-0342
R112
R113
R114
0686-7525
0686-3325
R: fxd, ww, 511 ohms ±1%, 0.08W
R: var, concentric
Front sect: ww, lin, 10K ohms ±10%, 2W
Rear sect: ww, lin, 800 ohms ±10%, 2W
Not assigned
R: fxd, comp, 7. 5K ohms ±5%, 1/2W
R: fxd, comp, 3.3K ohms ±5%, 1/2W
R115
R116
R117
R118
R119
0686-2725
0686-3325
0683-4315
0683-3305
0683-7505
R:
R:
R:
R:
R:
Rl02
Option
Option
Option
Option
Rl03
Option
Option
Option
Option
10
11,21
12,22
13,23
Description #
fxd,
fxd,
fxd,
fxd,
fxd,
comp,
comp,
comp,
comp,
comp,
Note
2. 7K ohms ±5%, 1/2W
3.3K ohms ±5%, 1/2W
430 ohms ±5%, 1/4W
33 ohms ±5%, 1/4W
75 ohms ±5%, 1/4W
# See introduction to this section
01370-1
6-5
Model 431B
Section VI
Table 6-1
Table 6-1.
Circuit
Reference
([j)
Index by Reference Designator (Cont'd)
Stock No.
Description #
R120
R121
R122
R123
R124
0683-2215
0683-1025
0683-2435
0683-9115
0683-2725
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
comp,
comp,
comp,
comp,
comp,
220 ohms ±5%, 1/4W
1K ohms ±5%, 1/4W
24K ohms ±5%, 1/4W
910 ohms ±5%, 1/4W
2. 7K ohms ±5%, 1/4W
R125
R126
R127
R128
R129
0686-1025
0686-1525
0686-7525
0686-3325
0686-1535
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
comp,
comp,
comp,
comp,
comp,
1K ohms ±5%, 1/2W
1. 5K ohms ±5%, 1/2W
7.5K ohms ±5%, 1/2W
3. 3K ohms ±5%, 1/2W
15K ohms ±5%, 1/2W
R130
R131
R132
R133
R134 thru R137
0687-3321
0687-5611
0686-3325
0687-1511
0758-0003
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
comp, 3.3K ohms ±10%, 1/2W
comp, 560 ohms ±10%, 1/2W
comp, 3. 3K ohms ±5%, 1/2W
comp, 150 ohms ±10%, 1/2W
mfgl, 1K ohms ±5%, 1/2W
R138
R139
R140
0687-1521
0687-1531
0686-1025
R: fxd, comp, 1. 5K ohms ±10%, 1/2W
R: fxd, comp, 15K ohms ±10%, 1/2W
R: fxd, comp, 1K ohms ±5%, 1/2W
R141
R142
R143, R144
R145 thru R149
R150
0687-3931
0687-1221
0687-5611
R: fxd, comp,
R: fxd, comp,
R: fxd, comp,
Not assigned
R: fxd! dep c,
0727-0131
R151
R152, R153
R154
R155
R156 thru R159
0687-3321
0727-0124
0687-5611
0687-3311
R: fxd, comp,
R: fxd, dep c,
R: fxd, comp,
R: fxd, comp,
Not assigned
R160
R161
R162
R163
R164
0727-0396
0727-0397
0727-0398
0727-0399
0727-0341
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
dep
dep
dep
dep
dep
c,
c,
c,
c,
c,
Note
39K*ohms ±10%, 1/2W
1.2K ohms ±10%, 1/2W
560 ohms ±10%, 1/2W
3920 ohms ±1 %, 1/2W
3. 3K ohms ±10%, 1/2W
3K ohms ±1 %, 1/2W
560 ohms ±10%, 1/2W
330 ohms ±10%, 1/2W
1.194K ohms ±1/2%, 1/2W
2.13K ohms ±1/2%, 1/2W
3. 79K ohms ±1/2%, 1/2W
6. 73K ohms ±1/2%, 1/2W
12K ohms ±1/2%, 1/2W
# See introduction to this section
6-6
01370-1
Section VI
Table 6-1
Model 431B
Table 6-1. Index by Reference Designator (Cont'd)
Circuit
Reference
r5jJ Stock No.
Note
Description #
R165
R166
R167
R168
R169
0727-0400
0727-0342
0727-0407
0727-0346
0727-0404
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
dep
dep
dep
dep
dep
c,
c,
c,
c,
c,
21.36K
38. 05K
82.09K
63. 14K
52. 55K
R170
R171
R172
R173
R174
0727-0402
0727-0401
0727-0403
0727-0405
0727-0406
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
dep
dep
dep
dep
dep
c,
c,
c,
c,
c,
46. 67K ohms ±1/2%, 1/2W
41.46K ohms ±1/2%, 1/2W
52.3K ohms ±1/2%, 1/2W
57 .46K ohms ±1/2%, 1/2W
69.49K ohms ±1/2%, 1/2W
R175
R176
R177
R178
R179
0727-0408
0727-0409
0727-0410
0687-5631
0687-5631
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
dep c,
dep c,
dep c,
comp,
comp,
94. 2K ohms ±1/2%, 1/2W
142K ohms ±1/2%, 1/2W
256. 8K ohms ±1/2%, 1/2W
56K ohms ±10%, 1/2W
56K*ohms ±10%, 1/2W
R180
R181
0758-0021
0727-0100
R: fxd, mfgl, 51K ohms ±5%, 1/2W
R: fxd, dep c, 1K ohms ±1%, 1/2W
Sl
S2
S3 thru S100
S101
S102
3101-0033
3100-0370
Switch, sl: DPDT
Switch, rot: 1 sect, 4 pos, includes: 431B-16C
Not assigned
Switch, sl: 4PDT
Switch, rot: 3 sect, 8 pos, includes: 431B-16B
3101-0032
3100-0273
9100-0141
ohms
ohms
ohms
ohms
ohms
±1/2%,
±1/2%,
±1/2%,
±1/2%,
±1/2%,
1/2W
1/2W
1/2W
1/2W
1/2W
Transformer, power
Not assigned
Transformer, audio
Transformer ~ audio
T1
T2 thm T100
T101, T102
T103, T104
9120-0066
9120-0065
W1
8120-0078
Assy, power cable: smooth black, extra limp,
7.5ft. NEMA plug-in
XF1
1400-0084
Fuseholder: extractor post type
Zl
413A-60A
Assy, coil, includes: L1,
R8
# See introduction to this section
01370-1
6-7
Model 431B
Section VI
Table 6-1
Table 6-1. Index by Reference Designator (Cont'd)
Circuit
Reference
~ Stock No.
Description #
Note
MISCELLANEOUS
G74-AW
G74-BE
G74-CW
Knob: VERNIER
Knob: ZERO
Knob: POWERoRANGE
Cl44B-43B-1
Cl44E-73A-1
Cl44E-73C-1
C144H-18
Cover, 6 x 11
Cover, half recess (top)
Cover, half module (bottom)
Foot assy, half module
431A-16A
431B-19A
431B-19B
431B-19W
Assy, cable 5', THERMISTOR MOUNT
Assy, power switch, includes: R1, S2
Assy, MOUNT RES switch, includes: Rl01, 8101
ABsy, RANGE switch, includes:
Rl17 thru Rl24,
8102
Rl60 thru Rl66
Stock No. 431B-16A
0510-0123
1205-0002
Retainer, indicator light used wi 1450-0048
Heat sink, transistor
9211-0160
9220-0225
Carton, corragated
Pad, foam
..
6-8
# See introduction to this section
01370-1
Section VI
Table 6-1
Model 431B
Table 6-1. Index by Reference Designator (Cont'd)
Circuit
Reference
0j) Stock No.
Description #
Note
OPTIONS
1420-0009
431A-64A
431A-64B
431B-95A
Option 01
Battery, rechargeable (BTl)
Support, battery
Cover, battery
Rechargeable battery installation kit
431A-16G
1251-0149
Option 02
Assy, cable, special purpose includes:
Connector, female
431B-16D
Option 10
Assy, cable 20' THERMISTOR MOUNT for use
with 0j) Model 486A or 478A thermistor mount
431B-16E
Option 11
Assy, cable 50' THERMISTOR MOUNT for use
with 0j) Model 486A thermistor mount
431B-16F
Option 12
Assy, cable 100' THERMISTOR MOUNT for use
with 0j) Model 486A thermistor mount
431B-16G
Option 13
Assy, cable 200' THERMISTOR MOUNT for use
with 0j) Model 486A thermistor mount
431B-16E
Option 21
Assy, cable 50' THERMISTOR MOUNT for use
with 0j) Model 478A thermistor mount
431B-16F
Option 22
Assy, cable 100' THERMISTOR MOUNT for use
with 0j) Model 478A thermistor mount
431B-16G
Option 23
Assy, cable 200' THERMISTOR MOUNT for use
with 0j) Model 478A thermistor mount
# See introduction to this section
01370-1
6-9
Model 431B
Section Vl
Table 6-2
Table 6-2.
~
stock No.
Replaceable Parts
Description #
Mfr.
Mfr. Part No.
TQRS
AC-10C
AC-10D
AC-54A
AC-54A-1
Binding post: black
Binding post: red
Insulator: black, 2 hole (inside)
Insulator: black, 2 hole (outside)
28480
28480
28480
28480
AC-10C
AC-10D
AC-54A
AC-54A-1
1
1
1
1
1
1
0
0
G74-AW
G74-BE
G74-CW
Knob: VERNIER
Knob: ZERO
Knob: POWER, RANGE
28480
28480
28480
G74-AN
G74-BE
G74-CW
1
1
2
0
0
0
431A-16A
Assy, cable 5', THERMISTOR MOUN']
MOUNT
Assy, cable, special purpose includes
stock No. 1251-0149
Assy, coil, includes: L1, R8
Support, battery
Cover, battery
28480
431A-16A
1
1
28480
431A-16G
1
0
28480
28480
28480
431A-60A
431A-64A
431A-64B
1
1
1
0
0
0
28480
28480
431B-16A
431B-16C
1
1
0
0
28480
431B-16D
1
0
28480
431B-16E
1
0
28480
431B-16F
1
0
28480
431B-16F
1
0
28480
431B-16G
1
0
28480
431B-16G
1
0
28480
431B-19A
1
1
28480
431B-19B
1
1
28480
431B-19W
1
1
431A-16G
431A-60A
431A-64A
431A-64B
431B-16A
431B-16C
431B-16D
431B-16E
431B-16F
431B-16G
431B-19A
431B-19B
431B-19W
Wiring harness
Wiring harness
Assy, cable 20' THERMISTOR
MOUNT for use with ~ Model
486A or 47 8A thermistor mount
Assy, cable 50' THERMISTOR
MOUNT for use with ~ Model
486A thermistor mount
Assy, cable 100' THERMISTOR
MOUNT
For use with ~ Model °486A
thermistor mount
For use with ~ Model 478A
thermistor mount
Assy, cable 200' THERMISTOR
MOUNT
For use with ~ Model 486A
thermistor mount
For use with ~ Model 478A
thermistor mount
Assy, power switch, includes: R1,
S2, Stock No. 4313-1.6C
Assy, mount RES switch, includes:
R101, SlOl
Assy, rand switch, includes: Rl17
thrll Rl f)f) Rto~k No. 431B-16A
# See introduction to this section
6-10
01370-1
Section VI
Table 6-2
Model 431B
Table 6-2.
<Fj)
Stock No.
Replaceable Parts (Cont'd)
Description #
Mfr.
Mfr. Part No.
TQ RS
Assy t etched circuit, includes:
R102, R103
C1 thru C6
R105 thru R110
C102, C106
Rl13 thru Rl16
C110 thru C125
CR1 thru CR9
Rl25 thru R140
CR101 thru CRl13 R142 thru R144
R150 thru R155
L101 thru L105
R167 thru R178
Q1 thru Q5
Q101 thru Q111
Rl80
Zl
R2 thru R7
R9 thru R14
Meter, calibrated
Recharageable battery installation kit
28480
431B-65A
1
0
28480
28480
431B-81A
431B-95A
1
1
1
0
Cover, 6x11
28480
C144B-43A-1
2
0
Cover, half recess (top)
28480
C144E-73A-1
1
0
Cover, half module (bottom)
Foot assy, half module
28480
28480
C144E-73C
C144H-18
1
1
0
0
0121-0035
C: var, air, 7.2-143. 7pf
80486
1
1
0140-0204
0140-0220
0150-0012
0160-0174
C:
C:
C:
C:
72136
72136
56289
56289
CT1-0-143G
(special)
DM15E470J
DM15F201F 300V
29C14A3-H-1038
5C11A
1
2
1
6
1
1
1
2
0160-0185
0170-0069
0180-0049
C: fxd, mica, 2100pf ±1%, 300 vdcw
C: fxd, poly. O.lJ.Lf ±2%, 50 vdcw
C: fxd. aluminum elect, 20j.Lf,
50 vdcw
C: fxd, elect, 10j.Lf +100%-10%,
25 vdcw
C: fxd, aluminum elect, 50j.Lf,
25 vdcw
14655
56289
56289
CD20F212F
114P1042R5S3
30D198A1
1
3
2
1
1
1
56289
30D182A1
6
2
56289
~7441
3
1
c:
56289
150D606XOO06B2
1
1
431B-65A
431B-81A
431B-95A
C144B-43A-1
C144E73A-1
C144E73C
C144H-18
0180-0059
0180-0105
0180-0106
fxd, mica. 47pf ±5%. 500 vdcw
fxd. mica. 200pf ± 1%. 300 vdcw
fxd. cer. O. 01J.Lf ±20%. 1000 vdcw
fxd, cer, O. 47J.Lf +80%-20%,
25 vdcw
fxd, tantalum elect, 60pJ ±20%,
6 vdcw
# See introduction to this section
01370-1
6-11
Model 431B
Section VI
Table 6-2
Table 6-2. Replaceable Parts (Cont'd)
~
Description #
Stock No.
Mfr.
Mfr. Part No.
TQ RS
0180-0138
C: fxd, aluminum elect, 100J.Lf
+100%-10%, 40 vdcw
56289
Type 41D
1
1
0510-0123
Retainer, indicator light
used w/1450-0048
78553
C12008-014-4
1
0
0683-1025
0683-2215
0683-2435
0683-2725
0683-3305
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
comp,
comp,
comp,
comp,
comp,
1K ohms ±5%, 1/4W
220 ohms ±5%, 1/4W
24K ohms ±5%, 1/4W
2.7K ohms ±5%, 1/4W
33 ohms *5%, 1/4W
01121
01121
01121
01121
01121
CB1025
CB2215
CB2435
CB2725
CB3305
1
1
1
1
1
1
1
1
1
1
0683-4315
0683-7505
0683-9115
0686-1025
0686-1525
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
comp,
comp,
comp,
comp,
comp,
430 ohms :1:5%, 1/4W
75 ohms ±5%, 1/4W
910 ohms ±5%, 1/4W
1K ohms ±5%, 1/2W
1.5K ohms ±5%, 1/2W
01121
01121
01121
01121
01121
CB4315
CB7505
CB9115
EB1025
EB1525
1
1
1
2
1
1
1
1
1
1
0686-1535
0686-2725
0686-3325
0686-7525
0687-1221
0687-1511
R:
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
fxd,
comp,
comp,
comp,
comp,
comI-,
comp,
15K ohms ±5%, 1/2W
2.7K ohms ±5%, 1/2W
3.3K ohms ±5%, 1/2W
7. 5K ohms ±5%, 1/2W
1.2K ohms ±10%, 1/2~
150 ohms ±10%, 1/2W
01121
01121
01121
01121
01121
01121
EB1535
EB2725
EB3325
EB2725
EB1221
EB1511
1
1
4
2
1
1
1
1
1
1
1
1
0687-1521
0687-1531
0687-1821
0687-2711
0687-3311
0687-3321
R:
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
fxd,
comp,
comp,
comp,
comp,
comp,
comp,
1. 5K ohms ±10%, 1/2W
15K ohms ±10%, 1/2W
1. 8Kohmg ±10%, 1/2W
270 ohms ±10%, 1/2W
330 ohms ±10%, 1/2W
3.3Kohms ±10%, 1/2W
01121
01121
01121
01121
01121
01121
EB1521
EB1531
EB1821
EB2711
EB3311
EB3321
1
1
1
1
1
5
1
1
1
1
1
2
0687-3331
0687-3931
0687-4721
0687-5611
0687-5631
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
comp,
comp,
comp,
comp,
comp,
33K ohms ±10%, 1/2W
39K ohms ±10%, 1/2W
4.7K ohms ±10%,1/2W
560 ohms ±10%, 1/2W
56K ohms ±10%, 1/2W
01121
01121
01121
01121
01121
EB3331
EB3931
EB4721
EB5611
EB5631
1
1
2
4
2
1
1
1
1
1
0690-1221
0690-3911
0727-0100
R: fxd, comp, 1.2K ohms ±10%, 1W
R: fxd, comp, 390 ohms ±10%, 1W
R: fxd, dep c, 1K ohms ±1%, 1/2W
01121
01121
19701
GB1221
GB3911
DC1/2CRS obd#
1
1
1
1
1
1
# See introduction to this section
6-12
01370-1
section VI
Table 6-2
Model 431B
Table 6-2. Replaceable Parts (Cont'd)
~
Description #
Stock No.
0727-0124
0727-0131
0727-0341
0727-0342
0727-0346
0727-0395
0727-0396
0727-0397
0727-0398
0727-0399
0727-0400
0727-0401
0727-0402
0727-0403
0727-0404
0727-0405
0727-0406
0727-0407
0727-0408
0727-0409
0727-0410
TQ RS
DC1/2CR5
CD1/2CR5,
DC1/2AR5,
DC1/2AR5,
obd#
obd#
obd#
obd#
2
1
1
1
1
1
1
1
19701
DC1/2AR5, obd#
1
1
c, 316 ohms ±1/2%, 1/2W 19701
19701
c, 1.194K ohms ±1/2%,
DC1/2AR5, obd#
DC1/2AR5, obd#
1
1
1
1
c, 2.13K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
c, 3. 79K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
c, 6.73K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
c, 21. 36K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
c, 41.46K ohms±1/2%,
19701
DC1/2AR5, obd#
1
1
c, 46.67K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
c, 52.3K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
c, 52. 55K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
57. 46K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
69.49K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
82.09K ohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
94.2Kohms ±1/2%,
19701
DC1/2AR5, obd#
1
1
142K ohms ±1/ 2%,
19701
DC1/ 2AR5, obd#
1
1
256.8K ohms ±1/2%,
19701
DC1/ 2AR5, obd#
1
1
c,
c,
c,
c,
R: fxd, dep
R: fxd, dep
1/2W
fxd,
dep
R:
1/2W
R: fxd, dep
1/2W
R: fxd, dep
1/2W
R: fxd, dep
1/2W
R: fxd, dep
1/2W
R: fxd, dep
1/2W
R: fxd, dep
1/2W
R: fxd, dep
1/2W
Mfr. Part No.
19701
19701
19701
19701
fxd, dep
fxd, dep
fxd, dep
fxd, dep
1/2W
R: fxd, dep
1/2W
R:
R:
R:
R:
Mfr.
3K ohms ±1 %, 1/2W
3920 ohms ±1%, 1/2W
12K ohms ±1/2%, 1/2W
38.05K ohms ±1/2%,
c, 63.14K ohms ±1/2%
R: fxd, dep c,
1/2W
R: fxd, dep c,
1/2W
R: fxd, dep c,
1/2W
R: fxd, depc,
1/2W
R: fxd, dep c,
1/2W
R: fxd, dep c,
1/2W
# see introduction to this section
01370-1
6-13
Model 431B
section VI
Table 6-2
Table 6-2. Replaceable Parts (Cont'd)
~
Description #
Stock No.
Mfr.
TQ RS
28480
28480
28480
28480
0727-0483
0727-0484
0727-0485
0727-0486
1
1
1
1
1
1
1
1
07115
07115
C-20, obd#
C-20, obd#
4
1
1
1
07115
C-20, obd#
1
1
07115
07115
C-20, obd#
C-20, obd#
1
1
1
1
200.3 ohms ±O.l%, 1/4W
189 ohms ±O.5%, 1/4W
255 ohms ±O.5%, 0.25W
511 ohms ±1%, O. 08W
887 ohms ±1%, 0.08W
05347
05347
05347
99957
99957
205RP, obd#
205RP, obd#
205RP, obd#
M3A, obd#
M3A, obd#
2
1
1
2
1
1
1
1
1
1
202.5
204. 3
208.8
206.6
213.5
1/4W
1/4W
1!4W
1/4W
1/4W
28480
28480
28480
28480
28480
0811-0085
0811-0086
0811-0087
0811-0088
0811-0089
1
1
1
1
1
1
1
1
1
1
WW,
227.6 ohms ±O. 5%, O. 25\\1
256 ohms ±O. 5%, 0.25W
262.1 ohms ±D. 5%, O. 25W
265.5 ohms ±O. 5%, O. 25W
190.9 ohms ±O. 5%, 1/4W
28480
28480
28480
28480
28480
0811-0090
0811-0091
0811-0092
0811-0093
0811-0094
1
1
1
1
1
1
1
1
1
1
ww,
ww,
ww,
ww,
ww,
194.2
200.7
258.2
202.5
200.7
28480
28480
28480
28480
28480
0811-0095
0811-0096
0811-0098
0811-0099
0811-0100
1
1
1
1
1
1
1
1
1
1
R: fxd, ww, 212.7 ohms ±O.l%, 1/4W 28480
0811-0101
1
1
0727-0483
0727-0484
0727-0485
0727-0486
R:
R:
R:
R:
0758-0003
0758-0005
0758-0020
0758-0021
R: fxd, mfgl, 1K ohms ±5%, 1/2W
R: fxd, metallic oxide, 4.7K ohms
±5%, 0.5W
R: fxd, metallic oxide, 10K ohms
±5%,0.5W
R: fxd, migl, 22K ohms ±5%, 1/2W
R: fxd, migl, 51K ohms ±5%, 1/2W
0811-0051
0811-0063
0811-0064
0811-0065
0811-0066
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
ww,
ww,
ww,
ww,
ww,
0811-0085
0811-0086
0811-0087
0811-0088
0811-0089
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
ww,
ww,
ww,
ww,
0811-0090
0811-0091
0811-0092
0811-0093
0811-0094
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
0811-0095
0811-0096
0811-0098
0811-0099
0811-0100
R:
R:
R:
R:
R:
fxd,
fxd,
fxd,
fxd,
fxd,
0811-0101
0758-0006
Mfr. Part No.
fxd,
fxd,
fxd,
fxd,
dep
dep
dep
dep
WW,
ww,
ww,
ww,
ww,
c,
c,
c,
c,
318.1
320. 1
323.4
329.8
ohms
ohms
ohms
ohms
ohms
ohms
ohms
ohms
ohms
ohms
ohms
ohms
ohms
ohms
±1%,
±1 %,
±1%,
±1%,
±O.l%,
±O.l%,
±O.l%,
±O.l%,
±O.l%,
1/2W
1/2W
1/2W
1/2W
±O. 5%, 1/4W
±O.5%, 1/4W
±O. 5%, O. 25W
±O.l%, 1/4W
±O.l%, 1/4W
# see introduction to this section
6-14
01370-1
Section VI
Table 6-2
Model 431B
Table 6-2.
~
Replaceable Parts (Cont'd)
Description #
Stock No.
Mfr.
Mfr. Part No.
TQ R8
1205-0002
Heat sink, transistor
00011
3AL635-2R
2
1
1251-0066
Jack, telephone, for 2 connector plug
82389
2J-1339
1
1
1251-0148
1251-0149
Connector, POWER: male, 3 pin
Connector, female, 6 contact
OOOOU
02660
H-1061 1G-3L
A1-PC6F-1000
1
1
1
1
1400-0084
Fuseho1der: extractor post type
75915
342014
1
1
1420-0009
Battery, rechargeable, 1-25AH
88220
obd#
1
1
1450-0048
Lamp, Ne: NE2H
08717
858-R
1
1
1850-0040
1850-0064
1850-0065
1851-0017
1854-0003
Transistor,
Transistor,
Transistor,
Transistor,
Transistor,
94154
02735
01295
01295
07263
2N383
2Nl183
2N1370
2N1304
8-3056
1
1
7
4
3
1
1
7
4
3
1901-0024
1901-0025
1902-0017
1902-0018
1910-0016
Diode,
Diode,
Diode,
Diode,
Diode,
82647
98925
01281
04713
93332
G-355-1
CSD2693
P88135
1N941
D2361
9
6
2
1
4
9
6
2
1
4
2100-0182
R: var, comp, lin, 3.3K ohms ±10%,
1/3W
R: var, concentric
Front sect: ww, lin, 10K ohms
±10%, 2W
Rear sect: ww, lin, 800 ohms
±10%, 2W
11237
UPE-70
1
1
11237
C2-252
1
1
2110-0017
Fuse, cartridge: 0.15 amp
75915
313.150
1 10
3100-0273
3100-0370
3101-0032
3101-0033
Switch,
Switch,
Switch,
Switch,
76854
76834
42190
42190
213364-K3
obd#
6613M (special)
4633
1
1
1
1
1
1
1
1
8120-0078
Assy, power cable: smooth black,
extra limp, 7. 5ft, NEMA plug-in
70903
KH-4147
1
1
2100-0342
Sf
Sf:
Sf:
Sf:
Ge:
Ge:
Ge:
Ge:
Ge:
Sf
2N383
2Nl183
2N1370
2N1304
50 rna @+lV, 100 PlY
avalanche
avalanche
100 rna @ lV, 60 PIV
rot: 3 sect, 8 pos
rot: 1 sect, 4 pos
sl: 4PDT
sl: DPDT
# See introduction to this section
01370-1
6-15
Model 431B
Section VI
Table 6-2
Table 6-2. Replaceable Parts (Cont'd)
~
Stock No.
Description #
Mfr.
Mfr. Part No.
TQ RS
9100-0141
Transformer, power
98734
61277
1
1
9110-0040
Inductor, audio
98734
1895
3
1
9120-0065
9120-0066
Transformer, audio
Transformer, audio
98734
98734
2-2690
2-2695
2
2
1
1
9140-0122
Coil, var, 2 windings, 9-20J,Lh each
09250
18-473
2
1
# See introduction to this section
6-16
01370-1
Appendix
Model 431B
APPENDIX
CODE LIST OF MANUFACTURERS (Sheet 1 of 2)
The following code numbers are from the Federal Supply Code for Manufacturers Cataloging Handbooks H4-1 (Name to Code)
and H4-2 (Code to Name) and their latest supplements. The date of revision and the date of the supplements used appear at
the bottom of each page. Alphabetical codes have been arbitrarily assigned to suppliers not appearing in the H4 handbooks.
CODE
NO.
MANUFACTURER
ADDRESS
00334 Humidiat Co.
Colton, Calif.
00335 Westrex Corp.
New York, N.Y.
00373 Garlock Packing Co.,
Electronic Products Div.
Camden, N.J.
OOH 6 Aerovox Corp.
New Bedford, Mass.
00779 Amp, Inc.
Harrisburg, Pa.
00781 Aircraft Radio Corp.
Boonton, N.J.
0081 5 Northern Engineering laboratories, Inc.
Burlington, Wis.
00853 Sangamo Electric Company,
Ordill Division (Capacitors)
Marion, III.
los Angeles, Calif.
00866 Goe Engineering Co.
los Angeles, Calif.
00891 Carl E. Holmes Corp.
Milwaukee, Wis.
01 1 21 Allen Bradley Co.
litton
Industries,
Inc.
Beverly
Hills, Calif.
01 255
01 281 Pacific Semiconductors, Inc.
Culver City, Calif.
01295 Texas Instruments, Inc.
Transistor Products Div.
Dallas, Texas
Alliance, Ohio
01349 The Alliance Mfg. Co.
Indianapolis, Ind.
01 561 Chassi-Trak Corp.
Van Nuys, Calif.
01 589 Pacific Relays, Inc.
Rockford, III.
01 930 Amerock Corp.
Santa Clara, Calif.
01961 Pulse Engineering Co.
021 1 4 Ferroxc.ube Corp. of America
Saugerties, N.Y.
Palo Alto, Calif.
02286 Cole Mfg. Co.
02660 Amphenol-Borg Electronics Corp.
Chicago, III.
02735 Radio Corp. of America
Semiconductor and Materials Div.
Somerville, N.J.
02771 Vocaline Co. of America, Inc.
Old Saybrook, Conn.
02777 Hopkins Engineering Co.
•
San Fernando, Calif.
03508 G.E. Semiconductor Products Dept.
Syracuse, N.Y.
Dayton, Ohio
03705 Apex Machine & Tool Co.
EI Monte, Calif.
03797 Eldema Corp.
03877 Transitron Electronic Corp. Wakefield, Mass.
Morristown, N.J.
03888 Pyrofilm Resistor Co.
039 5 4 Air Marine Motors, Inc. los Angeles, Calif.
04009 Arrow, Hart and Hegeman Elect. Co.
Hartford, Conn.
New York, N.Y.
04062 Elmenco Products Co.
04222 Hi-Q Division of Aerovox Myrtle Beach, S.C.
04298 Elgin National Watch Co.,
Electronics Division
Burbank, Calif.
04404 Dymec Division of
Hewlett-Packard Co.
Palo Alto, Calif.
04651 Sylvania Electric Prods., Inc.
Electronic Tube Div. Mountain View, Calif.
04713 Motorola, Inc., Semiconductor
Prod. Div.
Phoenix, Arizona
04732 Filtron Co., Inc.
Western Division
Culver City, Calif.
Northlake, III.
04773 Automatic Electric Co.
0479 6 Sequoia Wire & Cable
Company
Redwood City, Calif.
Chicago 44, III.
04870 P. M. Motor Co.
05006 Twentieth Century Plastics, Inc.
los Angeles, Calif.
05277 Westinghouse Electric Corp.,
Semi-Conductor Dept.
Youngwood, Pa.
San Mateo, Calif.
05347 Ultronix, Inc.
IIlumitronic
Engineering
Co.
05593
Sunnyvale, Calif.
Rockford, III.
05624 Barber Colman Co.
05729 Metropolitan Telecommunications Corp.,
Metro Cap. Div.
Brooklyn, N.Y.
Santa Cruz, Calif.
05783 Stewart Engineering Co.
Bridgeport, Conn.
06004 The Bassick Co.
los Angeles, Calif.
06136 Ward leonard Electric
061 75 Bausch and lomb Optical Co.
Rochester, N.Y.
06555 Beede Electrical Instrument Co., Inc.
Penacook, N.H.
0681 2 Torrington Mfg. Co., West Div.
Van Nuys, Calif.
CODE
NO.
o7 1 1 5
Corning Glass Works
Electronic Components Dept.
Bradford, Pa.
Pasadena, Calif.
Digitran Co.
07 1 37 Transistor Electronics Corp.
Minneapolis, Minn.
071 38 Westinghouse Electric Corp.
Electronic Tube Div.
Elmira, N.Y.
07261 Avnet Corp.
los Angeles, Calif.
07263 Fairchild Semiconductor Corp.
Mountain View, Calif.
079 1 0 Continental Device Corp. Hawthorne, Calif.
o 79 3 3 Rheem Semiconductor Corp.
Mountain View, Calif.
07 9 6 6 Shockley Semi-Conductor
laboratories
Palo Alto, Calif.
07980 Boonton Radio Corp.
Boonton, N.J.
081 45 U.S. Engineering Co.
los Angeles, Calif.
o 8 3 5 8 Burgess Battery Co.
Niagara Falls, Ontario, Canada
0871 7 Sloan Company
Burbank, Calif.
0871 8 Cannon Electric Co.
Phoenix, Ariz.
Phoenix Div.
o8 7 9 2 CBS Electronics Semiconductor
Operations, Div. of C.B.S. Inc.
lowell, Mass.
Indianapolis, Ind.
08994 Mel-Rain
Costa Mesa, Calif.
09026 Babcock Relays, Inc.
Houston, Texas
091 34 Texas Capacitor Co.
Electro
Assemblies,
Inc.
Chicago, III.
09250
09569
Ontario, Canada
1 021 4 General Transistor Western Corp.
los Angeles, Calif.
1 041 1 Ti-Tal, Inc.
Berkeley, Calif.
1 0646 Carborundum Co.
Niagara Falls, N.Y.
Berne, Ind.
1 1 236 CTS of Berne, Inc.
1 1 237 Chicago Telephone of California, Inc.
So. Pasadena, Calif.
1 1 3 1 2 Microwave Electronics Corp.
Palo Alto, Calif.
11 534 Duncan Electronics, Inc.
Santa Ana, Calif.
1 1 71 1 General Instrument Corporation
Semiconductor Division
Newark, N.J.
1 1717 Imperial Electronics, Inc.
Buena Park, Calif.
1 1 870 Melabs, Inc.
Palo Alto, Calif.
Dover, N.H.
1 2697 Clarostat Mfg. Co.
14655 Cornell Dubilier Elec. Corp.
So. Plainfield, N.J.
1 5909 The Daven Co.
livingston, N.J.
166 8 8 De Jur·Amsco Corporation
long Island City I, N.Y.
1 6758 Delco Radio Div. of G. M. Corp.
Kokomo, Ind.
1 8873 E. I. DuPont and Co., Inc. Wilmington, Del.
1 931 5 Eclipse Pioneer, Div. of
Bendix Aviation Corp.
Teterboro, N.J.
1 9500 Thomas A. Edison Industries,
Div. of McGraw-Edison Co.
West Orange, N.J.
1 9701 Electra Manufacturing Co. Kansas City, Mo.
201 83 Electronic Tube Corp.
Philadelphia, Pa.
21 520 Fansteel Metallurgical Corp.
No. Chicago, III.
21 335 The Fafnir Bearing Co.
New Britain, Conn.
21964 Fed. Telephone and Radio Corp.
Clifton, N.J.
24446 General Electric Co.
Schenectady, N.Y.
24455 G.E., lamp Division
Nela Park, Cleveland, Ohio
24655 General Radio Co.
West Concord, Mass.
26462 Grobet File Co. of America, Inc.
Carlstadt, N.J.
26992 Hamilton Watch Co.
lancaster, Pa.
Palo Alto, Calif.
28480 Hewlett·Packard Co.
33173 G.E. Receiving Tube Dept.
Owensboro, Ky.
35434 lectrohm Inc.
Chicago, III.
37942 P. R. Mallory & Co., Inc. Indianapolis, Ind.
39 543 Mechanical Industries Prod. Co.
Akron, Ohio
o7 1 2 6
M~~o::d~~tt.~d. CO'T~~onto,
00015-28
Revised: 4 September 1962
01370-1
ADDRESS
MANUFACTURER
CODE
NO.
MANUFACTURER
40920
Miniature Precision Bearings, Inc.
ADDRESS
Keene, N.H.
42190 Muter Co.
Chicago, III.
439 9 0 C. A. Norgren Co.
Englewood, Colo.
Skokie, III.
44655 Ohmite Mfg. Co.
47904 Polaroid Corp.
Cambridge, Mass.
48620 Precision Thermometer and
Inst. Co.
Philadelphia, Pa.
lexington, Mass.
49 9 5 6 Raytheon Company
54294 Shallcross Mfg. Co.
Selma, N.C.
Chicago, III.
55026 Simpson Electric Co.
Elmsford, N.Y.
55933 Sonotone Corp.
55938 Sorenson & Co., Inc.
So. Norwalk, Conn.
561 37 Spaulding Fibre Co., Inc. Tonawanda, N.Y.
56289 Sprague Electric Co.
North Adams, Mass.
St. Paul, Minn.
59446 Telex, Inc.
61775 Union Switch and Signal, Div. of
Westinghouse Air Brake Co. Swissvale, Pa.
Owosso, Mich.
621 1 9 Universal Electric Co.
New York, N.Y.
649 5 9 Western Electric Co., Inc.
65092 Weston Inst. Div. of Daystrom, Inc.
Newark, N.J.
Chicago 23, III.
66295 Wittek Manufacturing Co.
Rochester, N.Y.
66346 Wollensak Optical Co.
Hartford, Conn.
70276 Allen Mfg. Co.
New York, N.Y.
70309 Allied Control Co., Inc.
70485 Atlantic India Rubber Works, Inc.
Chicago, III.
New York, N.Y.
70563 Amperite Co., Inc.
Chicago, III.
70903 Belden Mfg. Co.
Cleveland, Ohio
70998 Bird Electronic Corp.
New York, N.Y.
71 002 Birnbach Radio Co.
71 041 Boston Gear Wprks Div. of
Quincy, Mass.
Murray Co. of Texas
Cleveland, Ohio
71 21 8 Bud Radio Inc.
Paramus, N.J.
7 1 2 8 6 Camloc Fastener Corp.
7 1 3 1 3 Allen D. Cardwell Electronic
Prod. Corp.
Plainville, Conn.
71 400 Bussmann Fuse Div. of McGrawEdison Co.
St. louis, Mo.
71 450 CTS Corp.
Elkhart, Ind.
71 468 Cannon Electric Co.
los Angeles, Calif.
Burbank, Calif.
71 471 Cinema Engineering Co.
71482 C. P. Clare & Co.
Chicago, III.
71 528 Standard-Thomson Corp.,
Clifford Mfg. Co. Div.
Waltham, Mass.
71 590 Centralab Div. of Globe Union Inc.
Milwaukee, Wis.
71 700 The Cornish Wire Co.
New York, N.Y.
71 744 Chicago Miniature lamp Works
Chicago, III.
71 753 A. O. Smith Corp., Crowley Div.
West Orange, N.J.
7 1 785 Cinch Mfg. Corp.
Chicago, III.
Midland, Mich.
7 1 984 Dow Corning Corp.
72 1 36 Electro Motive Mfg. Co., Inc.
Willimantic, Conn.
72354 John E. Fast & Co.
Chicago, III.
7261 9 Dialight Corp.
Brooklyn, N.Y.
726 5 6 General Ceramics Corp.
Keasbey, N.J.
72758 Girard-Hopkins
Oakland, Calif.
Chicago, III.
72765 Drake Mfg. Co.
72825 Hugh H. Eby Inc.
Philadelphia, Pa.
72928 Gudeman Co.
Chicago, III.
72964 Robert M. Hadley Co.
los Angeles, Calif.
72982 Erie Resistor Corp.
Erie, Pa.
73061 Hansen Mfg. Co., Inc.
Princeton, Ind.
731 38 Helipot Div. of Beckman
Instruments, Inc.
Fullerton, Calif.
73293 Hughes Products Division of
I
Hughes Aircraft Co. Newport Beach, Calif.
73445 Amperex Electronic Co., Div. of
North American Phillips Co., Inc.
Hicksville, N.Y.
73506 Bradley Semiconductor Corp. Hamden, Conn.
Hartford, Conn.
73559 Carling Electric, Inc.
73682 George K. Garrett Co., Inc.
Philadelphia, Pa.
From: F.S.C. Handbook Supplements
H4-1 Dated: June 1962
H4-2 Dated: March 1962
i-I
Model 431B
Appendix
APPENDIX
CODE LIST OF MANUFACTURERS (Sheet 2 of 2)
CODE
NO.
MANUFACTURER
ADDRESS
CODE
NO.
MANUFACTURER
73734
73743
73793
739 0 5
74455
74861
74868
ADDRESS
Federal Screw Products Co.
Chicago, III.
82647 Metals and Controls, Inc., Div. of
Texas Instruments, Inc.,
Fischer Special Mfg. Co.
Cincinnati, Ohio
Spencer Prods.
Attleboro, Mass.
The General Industries Co.
Elyria, Ohio
82866 Research Products Corp.
Madison, Wis.
Jennings Radio Mfg. Co.
San Jose, Calif.
82877 Rotron Manufacturing Co., Inc.
J. H. Winns, and Sons
Winchester, Mass.
Woodstock, N.Y.
Industrial Condenser Corp.
Chicago, III.
82893 Vector Electronic Co.
Glendale, Calif.
R.F. Products Division of Amphenol.
83053 Western Washer Mfr. Co. Los Angeles, Calif.
Borg Electronics Corp.
Danbury, Conn.
83058 Carr Fastener Co.
Cambridge, Mass.
749 7 0 E. F. Johnson Co.
Waseca, Minn.
83086 New Hampshire Ball Bearing, Inc.
75042 International Resistance Co. Philadelphia, Pa.
Peterborough, N.H.
83125 Pyramid Electric Co.
751 73 Jones, Howard B., Division
Darlington, S.C.
of Cinch Mfg. Corp.
Chicago, III.
83148 Electro Cords Co.
Los Angeles, Calif.
75378 James Knights Co.
Sandwich, III.
831 86 Victory Engineering Corp.
Union, N.J.
75382 Kulka Electric Corporation Mt. Vernon, N.Y.
83298 Bendix Corp., Red Bank Div.
Red Bank, N.J.
75818 Lenz Electric Mfg. Co.
Chicago, III.
83330 Smith, Herman H., Inc.
Brooklyn, N.Y.
7591 5 Littelfuse Inc.
Des Plaines, III.
83501 Gavitt Wire and Cable Co.,
76 0 0 5 Lord Mfg. Co.
Erie, Pa.
Div. of Amerace Corp.
Brookfield, Mass.
83594 Burroughs Corp.,
7621 0 C. W. Marwedel
San Francisco, Calif.
Electronic Tube Div.
Plainfield, N.J.
76433 Micamold Electronic Mfg. Corp.
83777 Model Eng. and Mfg., Inc.
Brooklyn, N.Y.
Huntington, Ind.
76487 James Millen Mfg. Co., Inc.
Malden, Mass.
83821 Loyd Scruggs Co.
Festus, Mo.
76493 J. W. Miller Co.
Los Angeles, Calif.
841 71 Arco Electronics, Inc.
New York, N.Y.
76530 Monadnock Mills
San Leandro, Calif.
84396 A. J. Glesener Co., Inc.
76 5 45 Mueller Electric Co.
Cleveland, Ohio
San Francisco, Calif.
76854 Oak Manufacturing Co.
Crystal Lake, III.
84411 Good All Electric Mfg. Co.
Ogallala, Neb.
77068 Bendix Pacific Division of
84970 Sarkes Tarzian, Inc.
Bloomington, Ind.
Bendix Corp.
No. Hollywood, Calif.
85454 Boonton Molding Company
Boonton, N.J.
77221 Phaostron Instrument and
85471 A. B. Boyd Co.
San Francisco, Calif.
Electronic Co.
South Pasadena, Calif.
85474 R. M. Bracamonte & Co.
77252 Philadelphia Steel and Wire Corp.
San Francisco, Calif.
Philadelphia, Pa.
85660 Koiled Kords, Inc.
New Haven, Conn.
77342 Potter and Brumfield, Div. of American
8591 1 Seamless Rubber Co.
Chicago, III.
Machine and Foundry
Princeton, Ind.
861 97 Clifton Precision Products
77630 Radio Condenser Co.
Camden, N.J.
Clifton Heights, Pa.
77638 Radio Receptor Co., Inc.
Brooklyn, N.Y.
86684 Radio Corp. of America, RCA
77764 Resistance Products Co.
Harrisburg, Pa.
Electron Tube Div.
Harrison, N.J.
8721 6 Phileo Corp. (Lansdale Division)
78189 Shake proof Division of Illinois
Lansdale, Pa.
Elgin, III.
Tool Works
87473 Western Fibrous Glass Products Co.
78283 Signal Indicator Corp.
New York, N.Y.
San Francisco, Calif.
78471 Tilley Mfg. Co.
San Francisco, Calif.
88140 Cutler-Hammer, Inc.
Lincoln, III.
7U88 Stackpole Carbon Co.
St. Marys, Pa.
88220 Gould·National Batteries, Inc. St. Paul .. Minn.
78553 Tinnerman Products, Inc.
Cleveland, Ohio
89473 General Electric Distributing Corp.
78790 Transformer Engineers
Pasadena, Calif.
Schenectady, N.Y.
896 3 6 Carter Parts Div. of Economy Baler Co.
78947 Ucinite Co.
Newtonville, Mass.
Chicago, III.
79142 Veeder Root, Inc.
Hartford, Conn.
896 6 5 United Transformer Co.
Chicago, III.
79 2 51 Wenco Mfg. Co.
Chicago, III.
90179 U.S. Rubber Co., Mechanical
79 7 2 7 Continental·Wirt Electronics Corp.
Goods Div.
Passaic, N.J.
Philadelphia, Pa.
90970 Bearing Engineering Co. San Francisco, Calif.
799 6 3 Zierick Mfg. Corp.
New Rochelle, N.Y.
91260 Connor Spring Mfg. Co. San Francisco, Calif.
80031 Mepco Division of
91 345 Miller Dial & Nameplate Co.
Sessions Clock Co.
Morristown, N.J.
EI Monte, Calif.
80120 Schnitzer Alloy Products
Elizabeth, N.J.
91418 Radio Materials Co.
Chicago, III.
80130 Times Facsimile Corp.
New York, N.Y.
91 506 Augat Brothers,'lnc.
Attleboro, Mass.
80131 Electronic Industries Association
91637 Dale Electronics, Inc.
Columbus, Nebr.
Any brand tube meeting EIA
91 662 Elco Corp.
Philadelphia, Pa.
standards
Washington, D.C.
91 737 Gremar Mfg. Co., Inc.
Wakefield, Mass.
80207 Unimax Switch, Div. of
W. L. Maxson Corp.
Wallingford, Conn.
91 827 K F Development Co.
Redwood City, Calif.
80248 Oxford Electric Corp.
Chicago, III.
91921 Minneapolis-Hone~ell Regulator Co.,
Micro-Switch Division
Freeport, III.
80294 Bourns Laboratories, Inc.
Riverside, Calif.
92196 Universal Metal Products, Inc.
80411 Aero Div. of Robertshaw
lassett Puent.., Calif.
Fulton Controls Co.
Columbus 16, Ohio
93332 Sylvania Electric Prod. Inc.,
Defiance, Ohio
80486 All Star Products Inc.
Semiconductor Div.
Woburn, Mass.
80583 Hammerlund Co., Inc.
New York, N.Y.
93 369 Robbins and Myers, Inc.
New York, N.Y.
Boston, Mass:
80640 Stevens, Arnold, Co., Inc.
93410 Stevens Mfg. Co., Inc.
Mansfield, Ohio
81 030 International Instruments, Inc.
939 8 3 Insuline-Van Norman Ind., Inc.
New Haven, Conn.
Electronic Division
Manchester, N.H.
81312 Winchester Electronics Co., Inc.
94144 Raytheon Mfg. Co., Industrial Components
Norwalk, Conn.
Div., ReceivinCil Tube Operation
81415 Wilkor Products, Inc.
Cleveland, Ohio
Quincy, Mass.
81453 Raytheon Mfg. Co., Industrial
94145 Raytheon MfCil. Co., Semiconductor Div.,
Components Div., Industr.
California Street Plant
Newton, Mass.
Tube Operations
Newton, Mass.
94148 Scientific Radio Products, Inc.
81483 International Rectifier Corp.
Loveland, Colo.
EI Segundo, Calif.
94154 Tung-Sol Electric, Inc.
Newark, N.J.
81860 Barry Controls, Inc.
Watertown, Mass.
94197 Curtiss-Wright Corp.,
Electronics Div.
East Paterson, N.J.
82042 Carter Parts Co.
Skokie, III.
9431 0 Tru Ohm Prod. Div. of Model
82142 Jeffers Electronics Division of
Engineering and Mfg. Co.
Chicago, III.
Speer Carbon Co.
Du Bois, Pa.
94682 Worcester Pressed Aluminum Corp.
82170 Allen B. DuMont Labs., Inc.
Clifton, N.J.
Worcester, Mass.
82209 Maguire Industries, Inc.
Greenwich, Conn.
9 5 2 3 6 Allies Products Corp.
Miami, Fla.
8221 9 Sylvania Electric Prod. Inc.,
Emporium, Pa.
Electronic Tube Div.
95238 Continental Connector Corp. Woodside, N.Y.
82376 Astron Co.
East Newark, N.J.
95263 Leecraft Mfg. Co., Inc.
New York, N.Y.
82389 Switchcraft, Inc.
Chicago, III.
95264 Lerco Electronics, Inc.
Burbank, Calif.
00015-2B
Revised: 4 September 1962
i-2
CODE
NO.
MANUFACTURER
ADDRESS
95265 National Coil Co.
Sheridan, Wyo.
95275 Vitramon, Inc.
Bridgeport, Conn.
95354 Methode Mfg. Co.
Chicago, III.
959B7 Weckesser Co.
Chicago, III.
96067 Huggins Laboratories
Sunnyvale, Calif.
96 095 Hi-Q Division of Aerovox
Olean, N.Y.
96256 Thordarson-Meissner Div. of
Maguire Industries, Inc.
Mt. Carmel, III.
Los Angeles, Calif.
96 2 9 6 Solar Manufacturing Co.
Chicago, III.
96 3 3 0 Carlton Screw Co.
96341 Microwave Associates, Inc. Burlington, Mass.
96 501 Excel Transformer Co.
Oakland, Calif.
97464 Industrial Retaining Ring Co. Irvington, N.J.
97539 Automatic and Precision
Mfg. Co.
Yonkers, N.Y.
97966 CBS Electronics,
Div. of C.B.S., Inc.
Danvers, Mass.
98141 Axel Brothers Inc.
Jamaica, N.Y.
9B220 Francis L. Mosley
Pasadena, Calif.
98278 Microdot, Inc.
So. Pasadena, Calif.
98291 Sealectro Corp.
Mamaroneck, N.Y.
98 4 0 5 Carad Corp.
Redwood City, Calif.
98734 Palo Alto Engineering
Co., Inc.
Palo Alto, Calif.
98 8 21 North Hills Electric Co.
Mineola, N.Y.
98925 Clevite Transistor Prod.
Div. of Clevite Corp.
Waltham, Mass.
9897B International Electronic
Research Corp.
Burbank, Calif.
99109 Columbia Technical Corp.
New York, N.Y.
9'131 3 Varian Associates
Palo Alto, Calif.
99 515 Marshall Industries, Electron
Products Division
Pasadena, Calif.
99 7 0 7 Control Switch Division, Controls Co.
of America
EI Segundo, Calif.
99 8 0 0 Delevan Electronics Corp.
East Aurora, N.Y.
99 8 4 8 Wilco Corporation
Indianapolis, Ind.
99 9 3 4 Renbrandt, Inc.
Boston, Mass.
99 9 42 Hoffman Semiconductor Div. of
Hoffman Electronics Corp.
Evanston, III.
99 9 5 7
Te~~n~:I?l Instrument C~{:';bury Park, Calif.
THE FOLLOWING H·P VENDORS HAVE NO NUM·
BER ASSIGNED IN THE LATEST SUPPLEMENT TO
THE FEDERAL SUPPLY CODE FOR MANUFACTURERS
HANDBOOK.
0000 F Maleo Tool and Die
Los Angeles, Calif.
0000 I Telefunken (c/o American
Elite)
New York, N.Y.
0000 M Western Coil Div. of Automatic
Ind., Inc.
Redwood City, Calif.
0000 N Nahm-Bros. Spring Co.
San Leandro, Calif.
0000 P Ty-Car Mfg. Co., Inc.
Holliston, Mass.
0000 T Texas Instruments, Inc.
Metals and Controls Div.
Versailles, Ky.
0000 U Tower Mfg. Corp.
Providence, R.1.
0000 W Webster Electronics Co. Inc.
New York, N.Y.
00.00 X Spruce Pine Mica Co.
Spruce Pine, N.C.
0000 Y Midlanci Mfg. Co. Inc.
Kansas City, Kans.
o 0 0 0 Z Willow Leather Products Corp. Newark, N.J.
o 0 0 A A British Radio Electronics Ltd.
Washington, D.C.
000 B B Precision Instrument Components Co.
Van Nuys, Calif.
000 C C Computer Diode Corp.
Lodi, N.J.
000 E E A. Williams' ManufacturinCil Co.
San Jose, Calif.
000 F F Carmichael Corrugated Specialties
Richmond, Calif.
000 G G Goshen Die Cutting Service
Goshen, Ind.
000 H H Rubbercraft Corp.
Torrance, Calif.
000 I I Birtcher Corporation, Industrial
Division
Monterey P~rk, Calif.
000 K K Amatom
New Rochelle, N.Y.
o0 0 L L Avery Label
Monrovia, Calif.
000 M M Rubber EnCil. A
Development
Hayward, Calif.
000 N N A "N" D ManufacturinCil Co.
San Jose 27, Calif.
000 P P Atohm Electronics,
Sun Valley, Calif.
000 Q Q Cooltron
Oakland, Calif.
000 R R Radio Industries
Des Plaines, III.
000 S S Control of Elgin Watch Co. Burbank, Calif.
000 T T Thomas & Betts Co., The
Elizabeth 1, N.J.
From: F.S.C. Handbook Supplements
H4-1 Dated: June 1962
H4-2 Dated: March 1962
01370-1
r-------------WARRANTY-----------.
All our products are warranted against defects in materials and workmanship for one year from
the date of shipment. Our obligation is limited to repairing or replacing products (except tubes)
which prove to be defective during the warranty period. We are not liable for consequential
damages.
For assistance of any kind, including help with instruments under warranty, contact your authorized ~
Sales Representative for instructions. Give full details of the difficulty and include the instrument model
and serial numbers. Service data or shipping instructions will be promptly sent to you. There will be no
charge for repair of instruments under warranty, except transportation charges. Estimates of charges for
non-warranty or other service work will always be supplied, if requested, before work begins.
CLAIM FOR DAMAGE IN SHIPMENT
Your instrument should be inspected and tested as soon as it is received. The instrument is insured for
safe delivery. If the instrument is damaged in any way or fails to operate properly, file a claim with the
carrier or, if insured separately, with the insurance company.
SHIPPING
On receipt of shipping instructions, forward the instrument prepaid to the destination indicated. You may
use the original shipping carton or any strong container. Wrap the instrument in heavy paper or a plastic
bag and surround it with three or four inches of shock-absorbing material to cushion it firmly and prevent
movement inside the container.
GENERAL
Your authorized ~ Sales Representative i ready to assist you in any situation, and you are always welcome to get directly in touch with Hewlett-Packard service departments:
CUSTOMER SERVICE
Hewlett-Packard Company
395 Page Mill Road
Palo Alto, California, U.S.A.
Telephone: (415) 326-1755
TWX No. PAL AL 117-U
Cable: "HEWPACK"
00390-2
OR (In Western Europe)
Hewlett-Packard S.A.
54-54bis Route Des Acacias
Geneva, Switzerland
Telephone: (022) 42. 81. 50
Cable: "HEWPACKSA"
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