HP 413A User manual
 / OPERATING AND SERVICE MANUAL
CERTIFICATION
THE HEWLETT-PACKARD COMPANY CERTIFIES
THAT THIS INSTRUMENT WAS THOROUGHLY
TESTED AND INSPECTED AND FOUND TO
MEET ITS PUBLISHED SPECIFICATIONS WHEN
IT WAS SHIPPED FROM THE FACTORY.
FURTHER CERTIFIES THATITS CALIBRATION
MEASUREMENTS ARE TRACEABLE TO THE
NATIONAL BUREAU OF STANDARDS TO THE
EXTENT ALLOWED BY THE BUREAU'S CALI-
BRATION FACILITY.
OPERATING AND SERVICE MANUAL
MODEL 413A/AR
SERIALS PREFIXED: 139
DC NULL VOLTMETER
Copyright HEWLETT-PACKARD COMPANY 1961
1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA, U.S.A.
01138-2
®
Printed:
FEB 1962
Table of Contents
Lists of Illustrations and Tables
Section
I GENERAL INFORMATION .
1-1. Introduction. . … . —
1-4, Description .
1-8. Three Conductor Power Cable.
1-10. Calibration Accuracy.
PREPARATION FOR USE ....
2-1. Incoming Inspection y
2-й, Reshipment . . « « « o » .
2-6. Installation . . .
2-8. 230-Volt Operation.
2-10. Environmental Limits
Ш ERATING INSTRUCTIONS .
1. Introduction . ,
-5. Controls . .
7
OP
=
3- ЧЕ
J- Operating Instructions
=
INCIPLES OF OPERATION
General. . « + « .
DC Input Circuits
AC Circuits. . . .
P
4-
4-
4-
4-
4-
нот 1
==
Power Supply . . . . . . .
V MAINTENANCE . . . . . . .
5-1 Introduction. . . . . .
5-3. Test Instruments Required 8
5-5. Cabinet Removal. . . . . :
Number Title
1-1. Model 413A DC Null Voltmeter
230-Volt Operation . o» a
‚ Rack Mount UÚBIL ; = к с ов ве
. . .
Model 413A Block Diagram
Modulator/Demodulator Operation
(Phase One) . . . .
(Phase Two) .
A101, Chopper Assembly . . .
Approximate Chopper Waveform .
for Modulator Replacement .
Number
5-1.
5-2.
oo
noi
MH
DC Output Circuits . . . . . .
Operating Controls, . . . . . . .
Model 413A
TABLE OF CONTENTS
LIST
Modulator /Demodulator Operation
Exploded View, Showing Disas sembly
Page
1-1
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Section
V Cont'd
5-7. Troubleshooting . . . . . .
5-
5-
5-
5-
5-
5-
5-
5
5-
5-
5-
5-
5-
5-
5-
5
5-
5-
5-
5-
5-
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6-
6-
8. General. . . Не
10. Amplifier- Power Supply
Та Chopper ARERR € e A
14. Modulator, . . . E ei:
16. Demodulator ; ‘
18, Repair and Replacement
19. General. . . . . À E 21
PAR Modulator Replacement. es
23. Demodulator Replacement
25. Range (Volts) Switch
Replacement « . « « . . . À
27. Tube Replacement . . . . . . .
29, Adjustments. . . . o
31. Mechanical Zero Adjustment “ой
33. Hum Balance . . .. ... ?
34. Bias Adjust .
-35. Amplifier Gain Calibration
and Meter Calibration
36. Preliminary. = « «5 s+ + 5» =
38. Gain Calibration. « + « о ‚>
-40. Performance Verification i
42 МОНЕТ) + » « * «e o 5 & =
-43. AC Rejection . . . . . .
-44 Amplifier Output.
PLACEABLE PARTS . « + « « « + &
EP
1. Introduction. . .
=.
Ordering Information.
OF ILLUSTRATIONS
Page
1-0
2-0
2-0
3-0
4-0
Number Title
5-4, Cabinet/Rack Demodulator
Differences. . . .
5-5. S101 Range (Volts) Switch Detail
LIST OF TABLES
Equipment Required .
Tube Replacement , .
Reference Designation Index
Replaceable Parts .
Hum Balance Test Setup . . . .
Preliminary Test Setup . . Wn
Amplifier Calibration Test Setup see
Performance Test (Voltmeter)
Setup.
, Performance Test (Amplifier)
SetuD:= e =.. à à e +
. Servicing Etched Circuit Boards.
Model 413A Right Side View
. Model 413A Left Side View .
Model 413A Bottom View . .
. Model 413A DC Null Voltmeter |
. Power Supply .
Page
Page
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REICH RICH A
1
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01138-2
Model 413A Table of Specifications
TABLE OF SPECIFICATIONS
VOLTMETER
Ranges: Positive and negative voltages from 1 mv to 1000 volts end scale in 13 zero-
center ranges
Accuracy: + 2% of end scale
AMPLIFIER
GENERAL
Limits of Zero Control:
Input Resistance:
AC Rejection:
Gain:
Gain Accuracy:
Linearity:
Noise:
Output:
Output Impedance:
AC Rejection:
Input Terminals:
Input Isolation:
Common Signal Rejection:
Power:
Dimensions:
Weight:
Approximately + end scale on any range
10 megohms on 1, 3, and 10 millivolt ranges
30 megohms on 30 mv range
100 megohms on 100 mv range
200 megohms on 300 mv range and above
A voltage at power line or twice power line frequency 40 db greater than end
scale affects reading less than 1%. Peakvoltage must not exceed 1500 volts,
0.001 to 1000 in 13 steps
+1-1/2%
+0.2%
Less than 0.1% (rms) of end scale on any range
1 volt for end scale deflection, same polarity as input signal, End scale cor-
responds to 1.0 on upper scale. Maximum load current is 1 milliampere.
Less than 2 ohms at de
Approximately 3 db at 1 cps, 80 db at 50 and 60 cps
Binding post
Greater than 100 megohms shunted by 0.1 uf to case (power line ground)
May be operated with up to 500 volts dc or 130 volts ac above ground
115 or 230 volts + 10%, 50 to 60 cps, approximately 35 watts
Cabinet Mount: 11-1/2 inches high, 7-1/2 inches wide, 10 inches deep
Rack Mount:
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412AR / 4I3AR
Cabinet Mount: Net 12 lbs, shipping 17 lbs
01138-1
iii
Section I
Figure 1-1
1-0
Figure 1-1. Model 413A DC Null Voltmeter
Model 413A
01138-1
Ty
PEE
Model 413A
Section 1
Paragraphs 1-1 to 1-13
SECTION |
GENERAL INFORMATION
1-1. INTRODUCTION.
1-2, SCOPE, This manual supplies operation and
maintenance information for the % Model 413A DC
Null Voltmeter, A performance check that may be
used for verifying specifications during incoming
inspection is given in paragraph 5-40.
1-3. INSTRUMENT IDENTIFICATION, Hewlett-
Packard Company uses a two-section eight-digit serial
number (e.g. 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, yellow
change sheets have been supplied with the manual which
define differences between your instrument and the
model described in this manual. If these change
sheets are missing, your Hewlett-Packard sales
representative can supply you with this information.
1-4. DESCRIPTION.
1-5. GENERAL, The Model 413A DC Null Voltmeter
is a zero-center dc voltmeter with end scale ranges
from 1 mv to 1000 volts in a 1-3-10 sequence. Input
impedance varies from 10 megohms to 200 megohms
depending on the setting of the RANGE (VOLTS) switch,
The input terminals are isolated from the cabinet and
ground permitting operation from references up to
500 volts dc or 130 volts ac from ground potential.
1-6. INDICATORS, In addition to the conventional
meter, which has both a normal (+ 10% of full scale)
and expanded (+ full scale) range of zero adjustment,
the Model 413A has amplifier output connectors which
provide an output voltage proportional to meter de-
flection. This feature makes it possible to use the
Model 413A as a dc amplifier for use with thermo=
couples, etc., or to use it in conjunction with a re-
corder to obtain permanent records without the need
for constant monitoring.
01138-1
1-7. USES, The Model 413A may be used for any
application that calls for a dc null voltmeter. High
input impedance of the instrument makes it especially
valuable for resistance bridge measurements. The
high voltage gain and the exceedingly low drift and
noise make the Model 413A an ideal instrument for
many control applications, particularly where the sys-
tem must be left unattended for long periods of time.
1-8. THREE-CONDUCTOR POWER CABLE.
1-9, For the protection of 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 pin. Topreserve
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.
1-10. CALIBRATION ACCURACY.
1-11. The Hewlett-Packard Company certifies that
this instrument was thoroughly tested and inspected,
and found to meet its published specifications when
it was shipped from the factory.
1-12, It further certifies thatits calibration measure=-
ments are traceable to the National Bureau of Standards
to the extent allowed by the Bureau's certification
facility.
1-13. Adjustments should not be attempted unless -
malfunction has been definitely established by follow-
ing the performance verification check in paragraph
5-40 of this manual,
Section Il Model 413A
Figure 2-1 and 2-2
DC AMPLIFIER
Fl OUTPUT TERMINALS
Si
115V-<— SWITCH —> 230V
MP-S- 936
Figure 2-1, 230-Volt Operation
MP-S-937
Figure 2-2. Rack Mount Unit
2-0 01138-1
Model 413A
Section Il
Paragraphs 2-1 to 2-11
SECTION II |
PREPARATION FOR USE
2-1. INCOMING INSPECTION.
2-2, MECHANICAL INSPECTION, Care is taken in
packing Hewlett-Packard instruments to assure un-
damaged delivery. Despite these precautions, however,
damage in shipment will sometimes occur, Upon re-
ceipt of your 413A, check the contents against the
packing list and inspect the instrument for any obvious
damage received in transit. If damage is evident, file
claim with the carrier. To facilitate reshipment,
keep the packing material until an operational check
has been made (see paragraph 2-3). Refer to the war-
ranty sheet in this manual for additional information,
2-3, OPERATIONAL CHECK. Paragraph 5-40 in-
cludes an in-cabinet check for verifying proper instru-
ment operation as given in published specifications.
If the Model 413A is to be operated from a 230-volt
source refer to paragraph 2-8.
2-4. RESHIPMENT.
2-5, If, after incoming inspection, damage is evident,
repack the instrument in its original shipping container
taking care to replace all pads in their original posi-
tions. If the packing material was discarded, contact
your nearest Hewlett-Packard sales office for infor-
mation and/or packaging material. If this is not
possible, the Model 413A should be packed ina strong
exterior container and surrounded by 3 to 4 inches
of cushioning material designed specifically for pack-
age cushioning.
01138-1
2-7. No special installation procedures are required
for the Model 413A cabinet model, The Model 413AR
rack mount (figure 2-2) mounts in a standard 19-inch
rack, Amplifier output connectors are provided on
both front and rear of the Model 413AR rack unit,
2-8. 230-VOLT OPERATION.
2-9, If 230-volt operation is desired, a screwdriver-
operated switch (see figure 2-1) is provided on the
rear of the instrument, A fuse of different rating
should be used, See Table of Replaceable Parts in
section VI,
2-10. ENVIRONMENTAL LIMITS.
2-11. The Model 413A is designed to operate within
the following environmental conditions,
a. otorage temperature: +167°F (75°C) to -40°F
(-40 0).
pe Operating temperature: 130°F (55°C) to 32°F
(0°С).
c. Radio interference: meets the requirements of
MIL-1-169104.
d. Altitude: O to 25,000 feet,
2-1
Section III Model 413A
Figure 3-1
MP-S-916
1. Power switch, Turns instrument ON, 5. ZERO control. Used to adjust electrical zero
setting of meter,
2, Pilot Light, Lights when instrument is ON,
; 6. NORMAL-EXPANDED switch, Provides a
ra TT choice of EXPANDED (x end scale) or a NOR-
8 : MAL (+ 10% end scale) range of zeroadjustment.
4, Amplifier Qutput terminals (rear of instrument,
not shown), Provides an output voltage pro- 7. INPUT connectors. Apply voltage to be mea-
portional to meter deflection, sured here (413A input is fully floating).
Figure 3-1. Operating Controls
3-0 01138-1
Model 413A
Section III
Paragraphs 3-1 to 3-9
SECTION III
OPERATING INSTRUCTIONS
3-1. INTRODUCTION.
3-2. GENERAL. This section contains information
on the function and use of all controls on the Model
413A DC Null Voltmeter. If more theoretical infor-
mation is desired, refer to section IV, Principles
of Operation.
3-3. LOW-LEVEL ELECTRICAL PHENOMENA,
Stray low-level electrical phenomena are present, in
one form or another, in nearly all electrical circuits,
The 413A does not distinguish between stray and signal
voltages; it measures net voltage, Thus, when using
the lower voltage ranges, consider the possibility of
low-level electrical phenomena. Thermocouples (ther=-
moelectric effect), flexing of coaxial cables (tribo-
electric effect), apparent residual charges on capaci-
tors (dielectric absorption), battery action of two
terminals mounted on an imperfectinsulator (galvanic
action) all can produce voltages within the range of
the 413A.
3-4. Whenever possible, use copper wire leads and
maintain the points of connection at the same tempera-
ture, preferably ambient temperature. With theleads
so connected, any voltage indicated by the 413A is
developed within the circuit under test.
3-5. CONTROLS.
3-6. Figure 3-1 shows all operating controls and
gives a short description of their use, Numbers in
figure 3-1 are given to relate the text in figure 3-1
to the photograph, and do not necessarily indicate
operational procedure (see paragraph 3-7), More
detailed information related to these controls is
listed below:
a, RANGE (VOLTS) switch, The RANGE (VOLTS)
switch adjusts the input circuit so that any voltage
between .001 and 1000 volts may produce end scale
deflection on the meter, The last position of the
RANGE (VOLTS) switch is used to adjust the cathode
follower bias (see paragraph 5-34).
b, INPUT terminals. The voltage to be measured
should be connected to these terminals. Polarity is
not important insofar as 413A operation is concerned.
However, to prevent ac loading of the circuit under
test, the low impedance line should be connected to
the right-hand terminal, since this terminal has the
higher capacitance to ground.
c, ZERO adjustment. The ZERO adjustment may be
used to adjust the electrical zero of the instrument to
the desired value, Meter calibration is correct only
when the meter needle is set to zero (amplifier output
voltage is always proportional to meter reading).
01138-1
d. NORMAL-EXPANDED switch, The NORMAL-
EXPANDED switch provides two ranges ofzero adjust-
ment, NORMAL position is used when the meter needle
has to be set critically within + 109, of end scale from
zero, EXPANDED is used when it is desired to set
a reference near the scale ends, Meter sensitivity
is unaffected by the setting of this control.
e. Amplifier Output terminals, The amplifier out-
put terminals, (figure 2-1) located on the rear of the
413A cabinet mount, and on both the front and rear of
the 413AR rack mounted instrument, provide an output
voltage proportional to meter deflection, End scale
meter deflection produces 1 volt output with the same
polarity as the input signal,
3-7. OPERATING INSTRUCTIONS.
3-8. The following is a step-by-step procedure for
operating the 413A. When operating the413A, be sure
that the ambient temperature is within the limits
specified in paragraph 2-10. Proceed as follows:
CAUTION
Do not overload this instrument, Theampli-
fier input is not protected from extreme
overload. Momentary overloads ten times
full scale will not damage the instrument,
a, Turn the power switch ON and allow 5 minutes
for the instrument to stabilize.
b. Ser NORMAL-EXPANDED switch to the position
desired,
c, Turn the RANGE (VOLTS) switch to the required
level,
d. Adjust the ZERO control to the desired setting,
(Zero offset, if any, remains constant regardless of
the range setting.)
e, Connect the voltage to be measured to the input
connectors,
3-9, OPERATION WITH A RECORDER. To obtain
permanent records of 413A readings, connect a re-
corder to the dc amplifier output connector, and
operate the 413A as directed in paragraph 3-7. The
output of the 413A amplifier is 1-volt end scale; if
necessary, externally attenuate the 413A output to
match it with recorder sensitivity, Maximum rated
load current from the 413A is 1 ma. A load resistance
of less than 1000 ohms may cause the load current to
exceed 1 ma and thus cause errors in meter indication
and amplifier gain,
3-1
Section IV Model 413A
Figure 4-1
CHOPPER ASSEMBLY
AlO3
SIOIAB
RANGE
VOLTS
CATHODE |
q 1 FILTER FILTER FOLLOWER e <
| VIO2B | :
I | — els
| an
MOD $ В METER LOUTPUT |
RANGE L > 2 Mioi| ~~ T°
ATTENUATOR MEE rd оо у
I > <
I foils !
| | Y |
| 2 $) SA Y 1 I
1 GAIN 9¢ $ |
| 3 cad 3 '
Ls ESE
«— NEGATIVE FEEDBACK '
O sas x
ADJUST y [NORMAL] ] [EXPANDED]
Y Y @
S102 $ 3“ METER
E Бес CAL.
= | с —» +255V m
HSV | 230V POWER | | рено BD-L-264
15 SUPPLY me 3 :
230V
Se -6 TO -7V
Figure 4-1. Model 413A Block Diagram
4-0 01138-1
Model 413A
Section IV
Paragraphs 4-1 to 4-8
SECTION IV
PRINCIPLES OF OPERATION
4-1. GENERAL.
4-2, The 413A is a dc voltmeter which accomplishes
amplification of the dc input voltage without the usual
problems of dc drift etc., by first changing the dc to
ac, amplifying it and then changing it back to dc for
application to the meter circuit and amplifier output
connector, Refer to figure 4-1 (block diagram) and
to the schematic (figures 5-15 and 5-16) for the fol-
lowing discussion.
4-3. DC INPUT CIRCUITS.
4-4, The input voltage is first fed to range attenuator
S101AB where it is attenuated according to the setting
of the RANGE (VOLTS) control. The voltage is then
fed through a low pass filter made up of R101-103 and
C101-103 to a photoconductor modulator, A102, The
filter attenuates any ac components present in the
input voltage.
4-5. AC CIRCUITS.
4-6, MODULATOR. A synchronous motor, В101,
drives a light interrupter which controls the resistance
of the photoconductors (photosensitive resistors) in
A102 modulator and A104 demodulator units. In
== = = = = a
|
I
|
TO RIO4 so-s-103 TO RII6
Figure 4-2, Modulator/Demodulator
Operation (Phase One)
01138-1
order to simplify the following circuit explanation,
the modulator will be discussed alone, However, this
discussion applies to demodulator operation as well,
4-7, In figure 4-2, B101 has turned the light inter-
rupter, and allowed the light source (DS102) to shine
on photoconductor V1, lowering its resistance to a
few thousand ohms. Since photoconductor V2 maintains
its “dark””? resistance of many megohms, the voltage
to the amplifier will be about the same as the dc
voltage applied to the modulator, In figure 4-3, how-
ever, B101 has turned the shutter assembly sufficiently
to turn off the light source to V1 and turn on the light
(DS101) to V2. Now the resistance of V1 will return
to its high ““dark’” resistance, whereas the resistance
of V2 will be very low. The voltage to the amplifier
will now be some very low voltage determined by the
ratio of the photoconductor resistances, This action
continues resulting in a square-wave signal of 5/6
line frequency.
4-8, AC AMPLIFIER, The ac amplifier, consisting
of V101AB and V102A, is a conventional circuit which
amplifies the modulator output about 500,000 times.
The output from V102A is fed to demodulator unit A104
which is synchronized with the modulator. The opera-
tion of the demodulator is similar to the modulator
but its action is essentially the reverse; e.g. to change
the square wave output from the amplifier back to dc.
50-5104 TO RII6
TO RIO4
Figure 4-3. Modulator/Demodulator
Operation (Phase Two)
Section IV
Paragraphs 4-9 to 4-12
4-9. DC OUTPUT CIRCUITS.
4-10, The output from the demodulator is filtered by
C114-116 and R114-118 and fed to cathode follower
V102B, Cathode follower bias is set by adjusting R116
Bias Adjust, The output of V102B is used for the
following purposes:
a, For meter deflection. R123 is used to adjust
the meter current to the correct value.
b. To provide a dc output voltage proportional to
meter deflection, This voltage is available at the dc
amplifier output terminals.
c. For feedback to the modulator assembly A102,
and the filter network. The negative feedback, adjusted
with R119 Gain Cal., stabilizes the dc gain of the
Model 413A
modulator-amplifier-demodulator system to a value
of 1111, thereby providing an output of 1 volt for an
input of 0,9 millivolts,
4-11. POWER SUPPLY.
4-12, The 413A power supply is a conventional full-
wave rectifier with resistors R1, R2, and zener diode
CR1 in the power transformer center tap to develop
the -6 to -7 volts for the cathode follower bias, Re-
sistor R8, ZERO, adjusts meter zero by changing the
dc bias of the modulator-amplifier-demodulator net-
work. Switch S2 changes T1 primary circuit for
230-volt operation. A fuse of different rating must be
used in case of 230-volt operation (see Table of
Replaceable Parts).
01138-1
и
Model 413A
Section V
Paragraphs 5-1 to 5-9
SECTION V
MAINTENANCE
5-1. INTRODUCTION.
5-2. This section contains test and maintenance in-
formation for the Model 413A DC Null Voltmeter. A
performance check is included (paragraph 5-40) that
may be used toverify operation within published speci-
fications. This check should be made with the instru=-
ment in its cabinet, and is a good test as part of
routine maintenance or as a part of your incoming
inspection.
5-3. TEST INSTRUMENTS REQUIRED.
5-4, Table 5-1 lists the test equipment that is re-
quired to complete the maintenance instructions in
this section, Instruments other than those recom-
mended may be used, provided their performance
meets the basic requirements given in table 5-1.
5-5. CABINET REMOVAL.
5-6. To remove the 413A cabinet, proceed as follows:
a, Unplug power cord from the power source.
b. Remove the two retaining screws on the rear
of the instrument (three screws for the rack mounted
413AR).
c. Slide the instrument chassis forward out of the
cabinet. Bezel ring remains attached to the front
panel.
CAUTION
Do not lubricate the RANGE (VOLTS) switch
or touch the switch wafers with the fingers
in the following procedures. Wear a pair
of light cotton gloves when handling the switch,
since skin oils and acids can contaminate
the switch wafers and degrade instrument
performance.
5-7. TROUBLESHOOTING.
5-8. GENERAL.
5-9. The following paragraph gives information to
aid in the localization of troubles inthe 413A. In most
cases, a trouble may be localized to a section from
Table 5-1. Equipment Required
Instrument Type
Minimum Required Specifications
Use Recommended Instruments
Voltmeter Calibra-| Output Voltage Range: 001 to
413A Amplifier tp Model 738AR Voltmeter
tion Generator 300 volts Calibration Calibrator
Signal Frequency: de
Accuracy: +0.25%
Low Frequency Sensitivity: 0,01 volt/cm minimum For 10 cps hum % Model 120AR Oscilloscope
Oscilloscope Frequency Response: flat down to mur ee
at least 10 cps RO e ato
check
Electronic Volt- Sensitivity: 0,05 volt full scale Troubleshooting tp Model 412A or 413A
meter Input Resistance: 10 megohms or and amplifier gain] Vacuum Tube Voltmeters
; calibration
higher
Variable Power Variation: from at least 102 to Power supply General Radio W10MT3A
Transformer 128 volts check Metered Variac® Auto-
Current Capabilities: at least transformer
1 ampere
Monitor Voltmeter: accurate to at
least +1 volt
Ohmmeter Accuracy: +5% Troubleshooting úp Model 410B or 412A
Ranges: to at least 10 megohms Yasui Tote Mbit ste ts
full scale
Voltage Source Voltage: between 1 and 2 volts Amplifier Gain Burgess HG3
Calibration Burgess No, 2, Size D
flashlight cell or equivalent
01138-1
5-1
Section V
Paragraphs 5-10 to 5-15
front panel indications, A good method is to follow
the performance verification procedure (paragraph
5=40) until the trouble manifests itself as a reading
that is out of the listed specifications, For example,
if the instrument operates properly on all voltage
ranges but ,003, only R82, R84 or associated switch
contacts and wiring can be faulty. A bad reading on
all ranges indicates trouble in the modulator-ampli-
fier-demodulator system, or in the power supply.
Note
The 413A is a sensitive instrument. If it
gives unexpected readings on its lowest volt=
age ranges, it may be measuring thermo-
electric voltages, etc., in addition to the
expected voltage (see paragraph 3-3).
5-10. AMPLIFIER-POWER SUPPLY,
5-11. Amplifier and power supply operation is best
checked by voltage readings and tube substitution. If
tube substitution does not correct the difficulty, return
the original tube to the instrument. If tubes are
changed, refer to table 5-2 for any necessary adjust=
ments. Voltages are indicated at various points on
the schematic diagrams (figures 5-15 and 5-16); these
are typical voltages and may vary somewhat from
instrument to instrument.
5-12. CHOPPER ASSEMBLY.
5-13, Before the modulator or demodulator can be
checked, it must be ascertained that the chopper
assembly, A103, is functioning properly. Refer to
figure 5-1 for location of parts in the following steps,
Proceed as follows:
BIOI
DSIO!
(DSIO2-413AR)
LIGHT DSI02
INTERRUPTER (DSIOI-4I3AR)
Figure 5-1, A103, Chopper Assembly
Model 413A
a, Remove cabinet (paragraph 5-5).
b. Check all four lamps (DS101-104) to make sure
they glow when power is applied.
c. Check the light interrupter inthe cut away portion
of the chopper assembly to see if the chopper blades
are rotating, A soldering aid may be inserted into the
slot for a moment if necessary to check operation.
d, If the chopper blades are not turning, look at the
motor operation indicator in the back of motor B101.
If B101 is operating, the chopper blade is loose on its
shaft. If not, check the 6.3 volt circuit to the motor.
5-14, MODULATOR.
5-15, To check modulator operation, proceed as
follows:
a, Unplug the 413A from the power source, and
remove the cabinet (paragraph 5-5).
b. Remove V101 and reconnect the 413A to the
power source.
c. Connect a clip lead from the 413A input terminals
to the center arm of R116, Bias Adjust Potentiometer,
d, Set RANGE (VOLTS) to ,001,
e, Set oscilloscope input to DC,
f. Connect one lead of an 8.2-megohm resistor to
oscilloscope signal connector (or probe). Using a
jumper wire, connect the other resistor lead to the
junction of R85 and S101D (point A in figure 5-5).
Connect oscilloscope common lead to 413A common
connector,
g. Observe amplitude of the dc voltage at point A.
h. Move oscilloscope probe (with resistor) to point
B in figure 5-3,
i, Waveform should be similar to that shown in
figure 5-2, and should have a peak-to-peak amplitude
approximately equal to the deflection found in step g.
Signal frequency should be 5/6 line frequency,
LO-5-451
Figure 5-2. Approximate Chopper Waveform
01138-1
Model 413A
Section V
Paragraphs 5-16 го 5-17
BLK TO
SIOIF
А103 LUCITE RETAINING
CHOPPER ASSEMBLY RODS COLLARS
WHT/RED
TO RI26
GRN TO
SI01D |
FRONT
PANEL
METER |
WHT TO
SIOIE RI21 RI19
BLK TO
CIRCUIT GROUND №
LO-L-488/RO
CIO3
А10!
INPUT CIRCUIT
ASSEMBLY
INSULATOR
\
COAX TO
PINZ VIOIA
NN
SHIELD
CONNECTION
COAX
CONNECTION
Jv
AMPLIFIER
CIRCUIT BOARD
ZERO RETAINING SCREW
MODULATOR
CONTROL ASSEMBLY FOR AIOI SHIELD
Figure 5-3. Exploded View, Showing Disassembly for Modulator Replacement
5-16. DEMODULATOR,
5-17, The demodulator assembly (Al04) is located
behind the meter between the main chassis and the
power transformer (see figures 5-4 and 5-13). Pro-
ceed as follows:
a. Unplug the 413A from the power source and re-
move the cabinet (see paragraph 5-5).
b, Remove V102,
c. Remove DS103 (figure 5-1) from chopper assem-
bly A103.
d. Connect a 1 uf capacitor across the input ter-
minals of the ohmmeter,
e. Connect the ohmmeter common lead to the de-
modulator terminal which has the pink-orange lead
connected to it,
f. Connect the other ohmmeter lead to the terminal
which has the white-orange lead connected to it,
01138-1
g. Plug the 413A into the power source and turn
it ON.
h. Note resistance indicated on the ohmmeter,
Typical resistance is between 1 and 2 megohms,
i. Turn the 413A off and unplug it from the powe
source.
j. Replace DS101 and remove DS102,
k. Connect the ohmmeter common lead to the de-
modulator terminal which has the brown-orange lead
connected to it.
m. Connect the other lead from the ohmmeter to
the terminal which has the white-orange lead con-
nected to it.
n. Plug the 413A into the power source, turn it ON
and note the resistance indicated on the ohmmeter.
Typical resistance is between 1 and 2 megohms.
p. Turn the 413A off and replace DS102 and V102.
5-3
Section V
Paragraphs 5-18 to 5-28
5-18. REPAIR AND REPLACEMENT.
5-19, GENERAL,
5-20. This paragraph is intended to simplify repair
problems in the 413A. Tube replacement information
is given, as well as repair procedures for the mod-
ulator, demodulator and RANGE (VOLTS) switch,
Repair procedures should be followed carefully to
assure correct operation of replacement parts, Re-
placing components on etched circuit boards requires
extra care (see figure 5-11). After component re-
placement in the following paragraphs, refer to para-
graph 5-29 (adjustments),
CAUTION
Do not lubricate the RANGE (VOLTS) switch
or touch the switch wafers with the fingers
in the following procedures, Wear a pair of
light cotton gloves when handling the switch,
since skin oils and acids can contaminate
the switch wafers and degrade instrument
performance.
5-21, MODULATOR REPLACEMENT,
5-22. Figure 5-3 shows necessary disassembly for
modulator replacement. Proceed as follows:
a. Unplug the 413A from the power source.
b. Remove the cabinet (paragraph 5-5).
c, Disconnect all wires from the top of Al01 as
shown in figure 5-3.
d. Remove chopper assembly, A103, and slide the
light rods out of A101.
Note
In the 413AR rack mount unit, it is not nec-
essary to remove the chopper assembly.
Perform step e and slide A101 away from
the light rods.
e. Remove the four screws holding the input circuit
assembly (A101) to the main chassis. When replacing
this assembly, be sure to reseatthe insulated washers
(figure 5-3) in their proper positions.
f. Disconnect the green lead at A101,
g. Carefully unsolder the shielded cable (figure 5-3)
from the amplifier circuit board (pin 2 and 3 of
V101A). (A length of cable is normally supplied with
the input circuit assembly. However, if it is more
convenient, and the cable is known to be good, it
may be disconnected at the input assembly circuit
board.) In any case, avoid undue heat that might
damage the inner conductor insulating material in
the coax.
h, Reverse the above procedure to install the re-
placement assembly,
5-4
Model 413A
5-23, DEMODULATOR REPLACEMENT,
5-24. To replace demodulator assembly, Al04, pro-
ceed as follows:
a, Turn the 413A off,
b. Remove the three leads connected to the demod=
ulator.
с. Remove the two nuts from the demodulator
mounting screws and remove the demodulator from
the instrument, If it is necessary to get at the screw
heads to remove the nuts, remove the four mounting
screws from the chopper assembly and let the assem-
bly hang by its leads,
d. Reverse the above procedure to install replace-
ment assembly. Wire connection differs for the
413A cabinet mount and the 413AR rack mount. See
figure 5-4 for wiring derail.
ДНИ Е
RACK MOUNT BOTTOM CABINET MOUNT
=
DEMODULATOR DETAIL
LO-5-445
Figure 5-4, Cabinet/Rack Demodulator Differences
5-25. RANGE (VOLTS) SWITCH REPLACEMENT,
5-26. Figure 5-5 shows the location of all parts
and wire destinations for the replacement of the
RANGE (VOLTS) switch, The Model 413A should be
checked for correct calibration after replacing this
switch,
CAUTION
Make solder connections as quickly as pos=-
sible when replacing components on the
RANGE (VOLTS) switch. AVOID EXCES-
SIVE HEAT, Excessive heat will damage
the switch wafers. Observe handling pre-
cautions described in paragraph 5-20,
5-27. TUBE REPLACEMENT,
5-28. If tubes are suspected of being defective, check
them by substitution and replace only those which
are defective, Table 5-2 gives any adjustments
necessary after tube replacement.
01138-2
Model 413A Section V
Figure 5-5
R77 R80 RBI
PNK TO
R125/R126
PNK/WHT
TO R125
PNK/WHT
TO RI25
PNK TO
R125/RI126
C99
BLK TO GRN TO
AIOI GND AIOI
LO-M-306
Figure 5-5, S101 Range (Volts) Switch Detail
01138-1 5-5
Section V
Paragraphs 5-29 to 5-37
Table 5-2, Tube Replacement
Ref, Desig, | Tube Type | Adjustment | Para. Ref,
V101 12AX7 Hum Balance 5-33
V102 6AUS Bias Adjust 5-35
V103 6X4
V104 0A2 None
V105 0B2
5-29. ADJUSTMENTS.
5-30. The following is a complete adjustment pro-
cedure and should be made only ifithas been definitely
determined that the 413A is out of adjustment, After
adjustment, refer to paragraph 5-40 to check instru-
ment operation,
5-31. MECHANICAL ZERO ADJUSTMENT,
5-32. When the meter is properly zero-set the 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:
a. Allow the instrument to operate for at least
20 minutes; this allows 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 clock=
wise until the meter pointer is to the left of zero and
moving to the right toward zero,
d. Continue to rotate adjustment screw clockwise;
stop when the pointer is right on zero, If the pointer
overshoots zero, repeat steps c and d,
e, When the pointer is exactly on zero rotate the
adjustment screw approximately 15 degrees counter-
clockwise. This is enough to free the adjustment
screw from the meter suspension, If the pointer moves
during this step, you must repeat steps c through e.
5-33. HUM BALANCE,
a. Turn instrument on and allow a few minutes
warmup.
b. Set RANGE (VOLTS) selector to 1.
c, Connect oscilloscope to the dc amplifier output
connector as shown in figure 5-6,
d. Adjust Hum Bal. (R3), for minimum 10-cps
signal as seen on oscilloscope. (If power-line fre-
quency is 50 cps, adjust for minimum 8-1/3 cps
signal.) See figure 5-13 for location of R3.
5-6
Model 413A
Mos. —
OSCILLOSCOPE || © o
0 a13A
DC NULL VOLTMETER
Figure 5-6, Hum Balance Test Setup
5-34. BIAS ADJUST.
a, Set RANGE (VOLTS) switch full clockwise --
one step beyond 1000,
b, Adjust Bias Adj. (R116), to set meter pointer to
zero +20% of end scale. R116 is located on instru-
ment rear, This adjustment is not critical, since any
deviation from zero is reduced more than 300 times
when the RANGE (VOLTS) switch is on any operating
position,
5-35. AMPLIFIER GAIN CALIBRATION
AND METER CALIBRATION.
5-36. PRELIMINARY,
5-37. The following procedure sets up a standard of
1 volt for voltage comparison for use in the following
procedures:
a, Connect a voltage calibration generator to a 313A
or 412A testvoltmeter and battery circuit as shown in
figure 5-7. This test voltmeter will hereafter be called
the accuracy indicator.
b. Set S1 in figure 5-7 to position 1,
с, Set voltmeter calibrator function switch to OFF,
d. Set accuracy indicator range switch to .03.
413A
DC NULL VOLTMETER
(ACCURACY INDICATOR)
#9 7384R
VOLTMETER CALIBRATOR MERCURY
CELL
. >5000 (
$ +134V—
SIK
Figure 5-7. Preliminary Test Setup
01138-2
~~.
Model 413A
413A dp 4134
DC NULL VOLTMETER DC NULL
(UNDER TEST) VOLTMETER
VOLTMETER CALIBRATOR
(RED
TO wee | Te |
OUTPUT | |
Figure 5-8, Amplifier Calibration Test Setup
e. If the accuracy indicator has no zero control,
observe the meter reading. This reading will be
used as the “zero error point”,
f. If the accuracy indicator has a zero control (as
in figures 5-7 and 5-8), adjust the ZERO control for
zero on the meter. At the same time set SI to posi-
tion 2 and voltmeter calibrator function switch to DC+,
g. Adjust В1 for the same reading observed in steps
e or f(zero error point). This accurately establishes
one volt at the center arm of R1. -
h. Each cardinal (numbered) point on the accuracy
indicator scale is now 1%, giving a range of +3% for
the accuracy indicator,
5-38. GAIN CALIBRATION,
5-39. The following procedure uses the standardized
test setup from paragraph 5-37. Proceed as follows:
a. Connect the accuracy indicator and the voltmeter
calibrator tothe 413A under test as shown in figure 5-8.
Note
The rest of this procedure assumes that a
DC Null Voltmeter such as the Model 413A
is being used as the accuracy indicator,
dp aia
DC NULL
VOLTMETER
7 38AR | | |
uu CALIBRATOR [
© © © io > ol
= - -
© ©
Figure 5-9. Performance Test (Voltmeter) Setup
01138-2
Section V
Paragraphs 5-38 tp 5-42
b. Set S1 in figure 5-8 to position 1.
c. Set the voltmeter calibrator function switch to
OFF and the range switches to providea +1 volt output.
d. Set 413A RANGE (VOLTS) switch to 1.
e. Adjust 413A ZERO control to read zero on the
accuracy indicator,
f. Set S1 in figure 5-8 to position 2 and set volt-
meter calibrator function switch to DC+.
g. Adjust R119, Gain Cal., (on the 413A under test)
for a reading of zero on the accuracy indicator,
h. Adjust R123, Meter Cal., for an end-scale reading
of 1 volt on the 413A,
i. Repeat steps 7, 8, and 9 using positive test volt-
ages ranging from 0,001 volts through 300 volts from
the voltmeter calibrator, Set the 413A RANGE
(VOLTS) switch to the appropriate range for each
voltage. Record the error readings of all ranges,
taking into account the algebraic sign of error observed.
j. Reverse the battery connection in the test setup
in figure 5-8, and repeat step i using negative test
voltages, If necessary, standardize the accuracy
indicator for negative voltages. (Follow paragraph
5-37, steps a through i with battery connections
reversed.)
k, Study the error readings and determine a new
setting for R119, Gain Cal., that will result in the
best overall error figures for the entire voltage range.
m. Adjust R119 for this new value on some con-
venient range.
n, The final setting must reduce error on any scale
to less than +1.5% on the accuracy indicator and
+2% of end scale on the 413A meter.
5-40. PERFORMANCE VERIFICATION.
5-41. The following procedure is to verify proper
operation and should be accomplished with the instru~
ment in its cabinet, This check may be made as a
final test for routine maintenance or as a part of your
incoming quality control inspection to verify listed
specifications, If the instrument fails any of the
following tests, refer to paragraph 5-29, Adjustment
Procedure, Proceed as follows:
Note
The following procedures assume correct
mechanical zero on the 413A meter (para-
graph 5-31).
5-42. VOLTMETER,
a, Turn the voltmeter calibration generator on and
allow a 20-minute warmup.
b. Switch the voltmeter calibrator function switch
to OFF, and connect the output connectors tothe 413A
INPUT as shown in figure 5-9,
5-7
Section V
Paragraphs 5-43 to 5-44
Cc, Connect the 413A to the variable power source,
set line voltage to rated value (115 or 230 volts) and
turn the 413A ON, Allow 15 minutes for the instrument
to warm up.
d. Turn 413A RANGE (VOLTS) switch fully clockwise
(one step past 1000), and observe the 413A meter.
e. Adjust R116, Bias Adjust, for a zero indication
+ 20% on the meter (see paragraph 5-34).
f. Switch 413A ZERO to NORMAL, and adjust the
ZERO control for an exact zero reading on the 413A
meter,
g. Switch 413A RANGE (VOLTS) to 300, and set
voltmeter calibrator output to +300 volts de.
WARNING
The 738AR Voltmeter Calibrator output is a
constant voltage source and can be dangerous!
Be careful not to touch the output leads with-
out first tuning OUTPUT SELECTOR to OFF,
h, The 413A meter should read +300 volts + 2% of
end scale,
i. Vary line voltage between 103 and 127 volts.
Meter reading sheuld be unaffected.
j. Repeat steps h and i for -300 volts,
k, Check end scale readings for the remaining
ranges. Specifications are +2% of end scale,
m. Switch 413A RANGE (VOLTS) to 1; set volt-
meter calibrator range and function switches for
1 volt de out.
n. Check meter tracking in 1/10 volt increments
for both plus and minus input voltages. Meter tracking
should be correct within + 2% of end scale.
Note
When checking the 413A on the .003 and ,001
volt ranges, set the voltmeter calibrator
selector switch to OFF and reset ZERO
control for a meter reading of zero,
5-8
Model 413A
5-43, AC REJECTION.
a. With 413A INPUT open, set 413A RANGE (VOLTS)
to .03. Set ZERO for a zero indication on the 413A
meter.
b. Connect a source of 6.3 volts ac (withno dc level)
across the 413A input. Any change in the 413A meter
reading should be less than 1%.
5-44, AMPLIFIER OUTPUT,
a, Connect a voltmeter calibrator and the accuracy
indicator (paragraph 5-37) to the 413A as shown in
figure 5-10,
b. Switch accuracy indicator range switch to ‚03,
c. Set 413A RANGE (VOLTS) switch to 1.
d. Switch voltmeter calibrator function and range
switches to +1 volt,
e. Accuracy indicator should indicate less than
1.5% error.
f, Repeat steps a to d for -1 volt,
dp a13A de 4130
D
DC NULL VOLTMETER
(UNDER TEST)
C NULL
VOLTMETER
Bp 7384R
VOLTMETER CALIBRATOR
© © ©
© ©
TO ;
DC AMPL.
OUTPUT |
HD
OR Gp) aiza
VACUUM TUBE
s0-s-1 VOLTMETER
Figure 5-10, Performance Test (Amplifier) Setup
01138-1
Model 413A Section V
Figure 5-11
SERVICING ETCHED CIRCUIT BOARDS
Excessive heat or pressure can lift the copper strip from the board. Avoid damage by using a low power
soldering iron (50 watts maximum) and following these instructions. Copper that lifts off the board should
be cemented in place with a quick drying acetate base cement having good electrical insulating properties.
A break in the copper should be repaired by soldering a short length of tinned copper wire across the break.
Use only high quality rosin core solder when repairing etched circuit boards. NEVER USE PASTE FLUX.
After soldering, clean off any excess flux and coat the repaired area with a high quality electrical varnish
or lacquer.
When replacing components with multiple mounting pins such as tube sockets, electrolytic capacitors, and
potentiometers, it will be necessary to lift each pin slightly, working around the components several times
until it is free.
WARNING: If the specific instructions outlined in the steps below regarding etched circuit boards without
eyelets are not followed, extensive damage to the etched circuit board will result,
1. Apply heat sparingly to lead of component to be 2. Reheat solder in vacant eyelet and quickly in-
replaced. If lead of component passes through sert a small awl to clean inside of hole. If hole
an eyelet in the circuit board, apply heat on com- does not have an eyelet, insert awl or a #57
ponent side of board. If lead of component does drill from conductor side of board.
not pass through an eyelet, apply heat to con-
ductor side of board. CONDUCTOR
SIDE
3. Bend clean tinned leads on new part and care- 4. Hold part against board (avoid overheating) and
fully insert through eyelets or holes in board. solder leads. Apply heatto component leads on
correct side of board as explained in step 1.
NEE
ad 215 PELE FEET
In the event that either the circuit board has been damaged or the conventional method is impractical, use
method shown below. This is especially applicable for circuit boards without eyelets.
1. Clip lead as shown below, 2. Bend protruding leads upward. Bend lead of
new component around protruding lead. Apply
solder using a pair of long nose pliers as a -
heat sink.
CLIP
HERE APPLY
SOLDER
ЛЕТЕЛ Ea LLL Err Err rrr rrr. rrr rrr)
WL Ll rnd rrr Lr rrr rr rr rrr rr
This procedure is used in the field only as an alternate means of repair. It is not used within the factory.
Figure 5-11. Servicing Etched Circuit Boards
01138-1 5-9
Section V Model 413A
Figure 5-12
: | psa R3
Ova Ag daW al - E
Sui ; СВ В HUM BAL.
1200-0016 4 — MR, | | В
RIO
AI03
C3AB
DS |
SIOI
RANGE (VOLTS) MP-5-934
Figure 5-12, Model 413A Right Side View
5-10 01138-1
Section V Model 413A
Figure 5-14
Fl CIAB cls RI24 CRI RIIS RIG
BIAS ADJUST
AMPLIFIER
T ; ë
pére Ч M - so" и ¡a : ES | CIRCUIT
ASSY: | A A AA E | | ASSY.
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CIO3
510!
RANGE (VOLTS) *
ТЕ
Si
RI26
R7
R8
MP-S-935
Figure 5-14. Model 413A Bottom View
5-12 01138-1
Model 413A
JIO! R76
SI01A 52e
voLTs | /o
о
5
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Oj SIOID
R83 R84
900K 2.845M
NOTES:
|, DC VOLTAGES REFERENCED TO 7 WITH LINE VOLTAGE AT I15V AND
NO METER DEFLECTION.
2. ALL RESISTANCE VALUES IN OHMS, CAPACITANCE IN PF UNLESS
OTHERWISE NOTED.
3. /77 = FLOATING CHASSIS GROUND. = =CABINET GROUND.
SWITCHES SHOWN FULLY CCW VIEWED FROM FRONT PANEL.
5. SIMPLIFIED DIAGRAMS FOR SIOIA & SIOIB SHOWN BELOW.
$
R76 SIOIA R76 6.155M
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SIMPLIFIED DIAGRAM OF SIOIA 8 SIOIB SWITCHING
01138 -2
Section V
Figure 5-15
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1007 x \ COPYRIGHT 1961 BY HEWLETT-PACKARD COMPANY
0) éme” a a N | и This drawing is intended for the operation
N x and maintenance of Hewlett-Packard equip-
EA: i i | ment and is not to be used otherwise or
DSIOI 05102 reproduced without written consent of the
Hewlett-Packard Company. 413A-50-T-139A8
+ <~ 6.3VAC
REFERENCE DESIGNATORS
BIO! 6 ) ре AIOI -AIO3
CHOPPER C99-CII8
eo ASSEMBLY DSIOI-DSI04
DSIO3 05104 5101-4103
. (e INDICATES PHASE ) MIO!
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, VIOI, VIO2
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NEGATIVE 1 RIZO 3
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Figure 5-15, Model 413A DC Null Voltmeter
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1HM/AH9
4n10°0
919
5-14
01138 -2
Model 413A
Section VI
Paragraphs 6-1 to 6-7
SECTION VI
REPLACEABLE PARTS
6-1. INTRODUCTION.
6-2. This section contains information for ordering
replacement parts. Table 6-1 lists parts in alpha-
numerical order of their reference designators and
indicates the description and % stock number of each
part, together with any applicable notes. Table 6-2
lists parts in alpha-numerical order of their ® stock
numbers and provides the following information on
each part:
a. Description of the part (see list of abbreviations
below).
b, Manufacturer of the part in a five-digit code;
see list of manufacturers in appendix.
c. Typical manufacturer’s stock number.
d. Total quantity used in the instrument (TQ column).
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,
6-4. ORDERING INFORMATION.
6-5. To order a replacement part, address order or
inquiry either to your authorized Hewlett-Packard
sales representative or to
CUSTOMER SERVICE
Hewlett-Packard Company
395 Page Mill Road
Palo Alto, California
or, in Western Europe, to
Hewlett-Packard S.A.
Rue du Vieux Billard No. 1
Geneva, Switzerland,
6 Specify the following information for each part:
Model and complete serial number of instrument.
-6.
а.
b. Hewlett-Packard stock number.
c. Circuit reference designator,
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 = assembly F = fuse P = plug у = vacuum tube, neon
B = motor FL = filter Q = transistor bulb, photocell, etc.
ón = ta J = jack В = resistor = a et
= e A = soc
DL = delay line E = rolay BT = thera ator XF = fuseholder
Ds = device signaling (lamp) L = inductor 5 = gwitch XV = tube socket
E = misc electronic part M = meter T = transformer XDS = lampholder
ABBREVIATIONS
bp = bandpass elect = electrolytic mtg = mounting rot = rotary
bwo = backward wave encap= encapsulated my = mylar rms = root-mean-square
oscillator rmo = rack mount only
f = farads NC = normally closed
с = carbon fxd = fixed Ne = neon s-b = slow-blow
cer = ceramic NO = normally open Se = selenium
cmo = cabinet mount only Ge = germanium NPO = negative positive sect = section(s)
coef = coefficient grd = ground (ed) zero-zero tem- Si = silicon
com = common perature coefficient sl = slide
comp = composition h = henries nsr = not separately
conn = connection Hg = mercury replaceable td = time delay
crt = cathode-ray tube TiO, = titanium dioxide
impg = impregnated obd = order by de-
dep = deposited ined = incandescent scription tog = toggle
det = detector ins = insulation (ed) tol = tolerance
p = peak trim = trimmer
EIA = Tubes and transistors K = kilo pc = printed circuit twt = traveling wave tube
selected for best rd Ш ;
performance will be lin = linear taper pi = picofarads = yay = sa
supplied if ordered log = logarithmic taper 10-12 farads = T te
by dy stock numbers; -3 pp = peak-to-peak Lu i E
tubes or transistors m = milli= 10 piv peak inverse Jo = without
meeting Electronic M = megohms voltage WARS NAR
Industries’ Associa- ma = milliamperes pos = position(s) * = gptimum value
es tion standards will minat= miniature poly = polystyrene selected at factory,
< normally result in mfg = metal film on pot = potentiometer average value
= instrument operating glass shown (part may
5 within specifications mfr = manufacturer rect = rectifier be omitted)
01138-2 6-1
Section VI Model 413A
Table 6-1
Table 6-1. Reference Designation Index
Capen ® Stock No Description # Not
Reference Е Р Ge
A1 thru A100 Not assigned
A101 412A-58A Assy, input circuit, includes:
A102 R101 thru R105
C101 thru C104 R119
C106 R120
C107
A102 412A -95A Assy, modulator
A103 425A-97A Assy, chopper: includes
B101, DS101 thru DS104
A104 412A-23B Assy, demodulator
A105 413A-19A Assy, range switch: includes
C99, R76 thru R95, R121, R127, S101
A106 413A-19B Assy, switch, zero: includes
R6 thru R9, R125, R126, S102
B1 thru B100 Not assigned
B101 3140-0013 Motor: 6.3 VAC
C1A/B 0150-0119 C: fxd, cer, 0.01 uf/sect,+20%, 250 vdcw
C2 Not assigned
C3A/B 0180-0086 C: fxd, elect, 2 sect, 20 uf/sect, 450 vdcw
C4 0180-0054 C: fxd, elect, 1500 uf, 10 vdcw
C5 thru C98 Not assigned
C99 0170-0019 C: fxd, my, 0.1 uf + 5%, 200 vdew
C100 Not assigned
C101 thru 0170-0030 С: fxd, poly, 0.1 uf + 1%, 50 vdcw
C103
C104 0170-0029 C: fxd, poly, 0.01 uf + 10%, 50 vdcw
C105 Not assigned
C106 0140-0010 C: fxd, mica, 820 pf + 10%, 500 vdcw
C107 0180-0033 C: fxd, elect, 50 uf, 6 vdcw
C108, 109 0150-0012 С: fxd, cer, 0.01 uf + 20%, 1000 vdcw
C110 0180-0033 C: fxd, elect, 50 uf, 6 vdcw
C111 0160-0015 C: fxd, paper, 0.47 uf + 10%, 200 vdcw
C112 0150-0024 С: fxd, cer, 0.02 uf +80%, -20%, 600 vdcw
C113 0150-0012 C: fxd, cer, 0,01 uf + 20%, 1000 vdcw
# See introduction to this section
01138-2
=,
Model 413A Section VI
Table 6-1
Table 6-1. Reference Designation Index (Cont'd)
д tp Stock No. Description # Note
C114 0170-0003 С; fxd, my, 0.051 uf + 10%, 200 vdew
C115, 116 0160-0015 C: fxd, paper, 0.47 uf + 10%, 200 vdcw
C117 0180-0105 C: fxd, elect, 50 uf, 25 vdcw
C118 0170-0022 C: fxd, my, 0.1 uf £ 20%, 600 vdcw
CRI G-31G-7H Diode: breakdown
DS1 2140-0012 Lamp, minat: 2 pin, no. 12
DS2 thru DS100 Not assigned
DS101 thru DS104 | 2140-0012 Lamp, minat: 2 pin, no. 12
Fl 2110-0020 Fuse, cartridge: 0.8 amp, s-b (for 115V operation)
2110-0018 Fuse, cartridge: 0.25 amp, s-b (for 230V operation)
J1 thru J100 Not assigned
J101 AC-10C Binding post: black
AC-10D Binding post: red
AC-54A Insulator: binding post, black, 2 hole
AC-54E Insulator: binding post, black, 2 hole
J102 AC-10C Binding post: black
AC-10C Binding post: black
AC-10D Binding post: red
AC-54B Insulator: binding post, black, 3 hole
AC-54F Insulator: binding post, black, 3 hole
J103 AC-10C Binding post: black (rmo)
AC-10C Binding post: black (rmo)
AC-10D Binding post: red (rmo)
AC-54B Insulator: binding post, black, 3 hole (rmo)
AC-54F Insulator: binding post, black, 3 hole (rmo)
M1 thru M100 Not assigned
M101 413A-81A Meter, calibrated
Pl 8120-0050 Cord, power: w/NEMA plug
R1 0690-5611 R: fxd, comp, 560 ohms + 10%, 1W
R2 0690-1211 R: fxd, comp, 120 ohms + 10%, 1 W
# See introduction to this section
01138-2 6-3
Section VI Model 413A
Table 6-1
Table 6-1. Reference Designation Index (Cont'd)
TS den ty Stock No. Description” Note
eference
R3 2100-0078 R: var, ww, lin, 500 ohms + 30%, 3/10W
R4 Not assigned
R5 0727-0233 R: fxd, dep c, 333K ohms + 10%, 1/2 W
R6, R7 0727-0124 R: fxd, dep c, 3K ohms + 1%, 1/2 W
R8 nsr; part of S102
R9 0727-0167 R: fxd, dep ce, 13. 7K ohms + 1%, 1/2 W
R10 0813-0018 R: fxd, ww, 2.8K ohms + 10%, 5W
R11 thru R75 Not assigned
R76 0727-0274 R: fxd, dep c, 1 M + 1%, 1/2 W
RTT 0733-0014 R: fxd, dep c, TOM + 1/2%, 2W
R78, 79 0730-0150 R: fxd, dep c, 50M + 1/2%, 1W
R80 0730-0149 R: fxd, dep c, 28.1M + 1/2%, 1W
R81 0730-0134 R: fxd, dep c, 8.1M + 1/2%, 1W
R82 0730-0128 R: fxd, dep c, 6.155M + 1/2%, 1W
R83 0727-0262 R: fxd, dep c, 900K ohms + 1/2%, 1/2W
R84 0730-0117 R: fxd, dep c, 2.845M + 1/2%, 1W
R85 0730-0139 R: fxd, dep c, 9M + 1/2%, 1W
R86 0727-0192 R: fxd, dep c, 46.3K ohms + 1/2%, 1/2W
R87 0727-0231 R: fxd, dep c, 284K ohms + 1/2%, 1/2W
R88 0727-0239 R: fxd, dep c, 389.5K ohms + 1/2%, 1/2W
R89 0727-0215 R: fxd, dep c, 123K ohms + 1/2%, 1/2W
R90 0727-0188 R: fxd, dep c, 38.95K ohms + 1/2%, 1/2W
R91 0727-0164 R: fxd, dep c, 12.3K ohms + 1/2%, 1/2W
R92 0727-0130 R: fxd, dep c, 3895 ohms + 1/2%, 1/2W
R93 0727-0106 В: fxd, dep c, 1230 ohms + 1/2%, 1/2 W
R94 0727-0070 В: fxd, dep с, 389 ohms + 1/2%, 1/2W
R95 0727-0051 R: fxd, dep c, 180 ohms + 1/2%, 1/2W
R96 thru R100 Not assigned
R101 0687-4741 R: fxd, comp, 470K ohms + 10%, 1/2W
R102 0687-1041 R: fxd, comp, 100K ohms + 10%, 1/2W
# See introduction to this section
6-4 01138 - 2
Model 413A Section VI
Table 6-1
Table 6-2, Reference Designation Index (Cont'd)
a ® Stock No. Description # Note
R103 0687-1821 R: fxd, comp, 1.8K ohms + 10%, 1/2W
R104 0727-0043 R: fxd, dep c, 100 ohms + 1%, 1/2W
R105 0687-4751 R: fxd, comp, 4.7M + 10%, 1/2W
R106 0687-1051 R: fxd, comp, 1M + 10%, 1/2W
R107 0687-1031 R: fxd, comp, 10K ohms + 10%, 1/2W
R108 0687-2261 R: fxd, comp, 22M + 10%, 1/2W
R109 0687-1051 R: fxd, comp, 1M + 10%, 1/2W
R110 0687-4731 R: fxd, comp, 47K ohms + 10%, 1/2W
R111 0687-2751 R: fxd, comp, 2.7M + 10%, 1/2W
R112 0687-1021 R: fxd, comp, 1K ohms + 10%, 1/2W
R113 0687-1041 R: fxd, comp, 100K ohms + 10%, 1/2W
R114 0687-8241 R: fxd, comp, 820K ohms + 10%, 1/2W
R115 0687-3331 R: fxd, comp, 33K ohms + 10%, 1/2W
R116 2100-0009 R: var, comp, 25K ohms + 20%, 1/3W
R117 0687-2751 R: fxd, comp, 2.7 + 10%, 1/2W
R118 0687-1031 R: fxd, comp, 10K ohms + 10%, 1/2W
R119 2100-0136 R: var, comp, lin, 6K ohms + 20%, 3/10W
R120 0727-0209 R: fxd, dep c, 108K ohms + 1%, 1/2W
R121 0727-0142 R: fxd, dep c, 6.2K ohms + 10%, 1/2W
R122 0727-0100 R: fxd, dep c, 1K ohms + 1%, 1/2W
R123 2100-0022 R: var, ww, lin, 500 ohms + 20%, 1W
R124 0687-1821 R: fxd, comp, 1.8K ohms + 10%, 1/2 W
R125 0727-0208 R: fxd, dep c, 100K ohms + 1%, 1/2W
R126 0727-0278 R: fxd, dep c, 1.13M + 1%, 1/2W
R127 0727-0283 R: fxd, dep c, 1.66M + 1%, 1/2W
51 3101-0001 Switch, tog: SPST
s2 3101-0033 Switch, sl: DPDT
S3 thru S100 Not assigned
S101 nsr; part of range switch assy, A105
5102 3100-0290 Switch, rot: 1 sect, 2 pos, w/R8 var resistor
# See introduction to this section
01138-2 6-5
Model 413A
Section VI
Table 6-1
Table 6-1. Reference Designation Index (Cont'd)
wa t Stock No. Description # Note
TI 9100-0021 Transformer, power
V1 thru V100 Not assigned
v101 1932-0030 Tube, electron: 12AX7
V102 1933-0007 Tube, electron: 6GAU8
V103 1930-0016 Tube, electron: 6X4
V104 1940-0004 Tube, electron: 0A2
V105 1940-0007 Tube, electron: 0B2
XDS1 1450-0022 Lampholder (rmo)
1450-0043 Lampholder (cmo)
XF1 1400-0084 Fuseholder
XV1 thru Not assigned
XV 100
XV101 1200-0048 Socket, tube: 9 pin
XV102 1200-0059 Socket, tube: 9 pin, minat
XV103 thru 1200-0009 Socket, tube: 7 pin, minat
XV105
MISCELLANEOUS
G-74G Knob, black: 1 in. ZERO CONTROL
G-74N Knob, bar w/arrow RANGE (volts) SWITCH
G-T4AT Knob, red: 3/4 in. bar w/arrow NORMAL EXPAND
SWITCH
412A -37A Light rod: modulator (cmo)
412A-37B Light rod: modulator (rmo)
412A-65A Assy, amplifier
412A-65A-1 Circuit board, amplifier: includes
C108 thru C110 R111 thru R114
C112 V101
C113 V102
R106 thru R109
# See introduction to this section
01138-2
Model 413A Section VI
Table 6-2
Table 6-2. Replaceable Parts
tp Stock No. Description # Mfr, Mir. Part No. TQ|RS
AC-10C Binding post: black 28480 AC-10C
(cmo) 3|1
(rmo) 5
AC-10D Binding post: red 28480 AC-10D
(emo) 2 |1
(сто) 3
AC-54A Insulator: Binding post, black, 2 hole 28480 AC-54A 1-10
AC-54B Insulator: Binding post, black, 3 hole 28480 AC-54B
(cmo) 1/0
(rmo) 2
AC-54E Insulator: Binding post, black, 2 hole 28480 AC-54E 1 1-9
AC-54F Insulator: Binding post, black, 3 hole 28480 AC-54F
(cmo) 1 440
(rmo) 2
G-31G-TH| Diode: breakdown 28480 G-31G-7H 1-4
412A-23B | Assy, demodulator 28480 412A-23B 111
412A-58A | Assy, input circuit, includes: 28480 412A-58A 11-1
A102, C101 thru C104, C106, C107,
R101 thru R105, R119, R120
412A-95A | Assy, modulator 28480 412A-95A 1|1
413A-19A | Assy switch, range: includes: 28480 413A-19A 111
C99, R76 thru R95, R121, R127, S101
413A-19B Assy switch, zero: includes: 28480 413A-19B 1 4
R6 thru R9, R125, R126, S102
413A-81A | Meter, calibrated 28480 413A-81A 1| 1
425A-97A | Assy chopper: includes 28480 425A-97A A 4
B101, DS101 thru DS104
0140-0010 С: fxd, mica, 820 pf + 10%, 500 vdcw 76433 RCM20B821K 1 121
0150-0012| C: fxd, cer, 0.01 uf + 20%, 1000 vdcw 56289 29C214A3-H-1038 3 |1
0150-0024| С: fxd, cer, 0.02 uf +80% -20%, 600 vdcw 91418 B.02 GMV 143
0150-0119| С: fxd,cer, 2 sect., 0.01 uf/sect+ 20%,250 vdcw| 71590 DA171CB { {1
0160-0015] С: fxd, paper, 0.47 uf + 10%, 200 vdcw 56289 109P47492 3 | X
0170-0003| C: fxd, my, 0.051 uf + 10%, 200 vdcw 00853 33M02151 1121
0170-0019| С: fxd, my, 0.1 uf + 5%, 200 vdcw 84411 620S 314
0170-0022| С: fxd, my, 0.1 uf + 20%, 600 vdcw 56289 592684 ENT
0170-0029| C: fxd, poly, 0.01 uf + 10%, 50 vdcw 56289 114P1039R5S2 L 14
0170-0030| C: fxd, poly, 0.1 uf + 10%, 50 vdew 56289 Type 114P = | 1
Style T15
# See introduction to this section
01138-2 6-7
Section VI Model 413A
Table 6-2
Table 6-2. Replaceable Parts (Cont'd)
tp Stock No, Description# Mir. Mir. Part No. TQIRS
0180-0033 | C: fxd, elect, 50 uf, 6 vdcw 56289 30D133A1 2 | 1
0180-0054 | C: fxd, elect, 1500 uf, 10 vdcw 56289 D32495 114
0180-0086 | С: fxd, elect, 2 sect, 20 uf/sect, 450 vdcw 00853 Type PL1 14
0180-0105 | C: fxd, elect, 50 uf, 25 vdcw 56289 597441 11
0687-1021 | В: fxd, comp, 1K ohms + 10%, 1/2W 01121 EB1021 LA
0687-1031 | R: fxd, comp, 10K ohms + 10%, 1/2W 01121 EB1031 2 |1
0687-1041 | R: fxd, comp, 100K ohms + 10%, 1/2W 01121 EB1041 2 |1
0687-1051 | R: fxd, comp, 1M + 10%, 1/2W 01121 EB1051 2 |1
0687-1821 | R: fxd, comp, 1.8K ohms + 10%, 1/2W 01121 EB1821 2 11
0687-2261 | R: fxd, comp, 22M + 10%, 1/2W 01121 EB2261 a
0687-2751 | R: fxd, comp, 2.7M + 10%, 1/2W 01121 EB2751 2 |1
0687-3331 | R: fxd, comp, 33K ohms + 10%, 1/2W 01121 EB3331 1 313
0687-4731 | В: fxd, comp, 47K ohms + 10%, 1/2W 01121 EB4731 y A
0687-4741 | R: fxd, comp, 470K ohms + 10%, 1/2W 01121 EB4741 1 14a
0687-4751 | В: fxd, comp, 4.7 m + 10%, 1/2W 01121 EB4751 1 |1
0687-8241 | R: fxd, comp, 820K ohms + 10%, 1 /2W 01121 EB8241 1
0690-1211 | R: fxd, comp., 120 ohms + 10%, 1W 01121 GB1211 1 11
0690-5611 | R: fxd, comp, 560 ohms + 10%, 1W 01121 GB5611 144
0727-0043 | R: fxd, dep c, 100 ohms + 1%, 1/2W 19701 DC 1/2 BR5, obd# |1 |1
0727-0051 | R: fxd, dep c, 180 ohms + 1/2W 19701 DC1/2 AR5, obd# |1 |1
0727-0070 | R: fxd, dep c, 389 ohms + 1/2%, 1/2W 19701 DC 1/2 AR5, obd# |1 |1
0727-0100 | R: fxd, dep c, 1K ohms + 1%, 1/2W 19701 DC 1/2 CR5, obd# |1 |1
0727-0106 | R: fxd, dep c, 1.23K ohms + 1/2%, 1/2W 19701 DC 1/2 ARS, obd# |1 |1
0727-0124 | R: fxd, dep c, 3K ohms + 1%, 1/2 W 19701 DC 1/2 CR5, obd# [2 |1
0727-0130 | R: fxd, dep c, 3895 ohms + 1/2%, 1/2W 19701 DC 1/2 AR5, obd# [1 |1
0727-0142 | R: fxd, dep c¢, 6.2K ohms + 1%, 1/2W 19701 DC 1/2 AR5, obd# [1 |1
0727-0164 | R: fxd, dep e, 12, 3K ohms + 1/2%, 1/2W 19701 DC 1/2 AR5, obd# [1 |1
0727-0167 | R: fxd, dep c, 13. 7K ohms + 1%, 1/2W 19701 DC 1/2 CR5, obd [1 |1
0727-0188 | R: fxd, dep c, 38, 950 ohms, +1%, 1/2W 19701 DC 1/2 AR5, obd# [1 |1
0727-0192 | В: fxd, dep c, 46.3K ohms + 1/2%, 1/2W 19701 DC 1/2 CR5, obd# [1 |1
# See introduction to this section
6-8 01138-2
Model 413A Section VI
Table 6-2
Table 6-2. Replaceable Parts (Cont'd)
1) Stock No. Description # Mfr. Mfr, Part No, TQIRS
0727-0208 | R: fxd, dep c, 100K ohms + 1%, 1/2W 19701 DC 1/2 CR5, obd# | 11
0727-0209 | R: fxd, dep c¢, 108K ohms + 1%, 1/2W 19701 DC 1/2 AR5, obd# Là
0727-0215 | R: fxd, dep c, 123K ohms + 1/2%, 1/2W 19701 DC 1/2 AR5, obd# 1 |1
0727-0231 | В: fxd, dep c, 284K ohms = 1/2%, 1/2W 19701 DC 1/2 AR5, obd# [1 |1
0727-0233 | R: fxd, dep c, 333K ohms + 1%, 1/2W 19701 DC 1/2 AR5, obd# 1 |1
0727-0239 | R: fxd, dep c, 389.5K ohms + 1/2%, 1/2 W 19701 DC 1/2 AR5, obd# 1 EL
0727-0262 | R: fxd, dep c, 900K ohms + 1/2%, 1/2W 19701 DC 1/2 AR5, obd# E e
0727-0274 | В: fxd, dep c, 1M + 1%, 1/2W 19701 DC 1/2 AR5, obd# 14
0727-0278 | В: fxd, dep ce, 1,13M + 1%, 1/2 W 19701 DC 1/2 CR5, obd# 1 11
0727-0283 | В: fxd, dep с, 1. 66M + 1%, 1/2 W 19701 DC 1/2 AR5, obd# 1 |1l
0730-0117 | R: fxd, dep c, 2.845 M + 1%, 1W 19701 DC 1 R5, obd# 1 1
0730-0128 | R: fxd, dep c, 6.155M + 1%, 1W 19701 DC 1 R5, obd# 1 |1
0730-0134 | В: fxd, dep c, 8.1 М + 1/2%, 1W 19701 DC 1 R5, obd# 1 |1
0730-0139 | R: fxd, dep c, 9 M + 1/2%, 1W 19701 DC 1 R5, obd# I LI
0730-0149 | В: fxd, dep c, 28.1 M + 1/2%, 1W 03888 PT1000, obd# 1 |1
0730-0150 | R: fxd, дер с, 50M + 1/2%, 1W 03888 PT1000, obd# 2 |1
0733-0014 | В: fxd, dep c, TOM + 1%, 2W 03888 PT2000, obdtt 1 |1
0813-0018 | R: fxd, ww, 2.8K ohms + 10%, 5W 35434 C-5-2800 1-13
1200-0009 | Socket, tube: 7 pin, minat 91662 316PH-3702 3 |1
1200-0048 | Socket, tube: 9 pin 91662 3908-2-4 1 |1
1200-0059 | Socket, tube: 9 pin, minat 71785 121-51-11-082 1 |1
1400-0084 | Fuseholder 75915 342014 1 |1
1450-0022 | Lampholder (rmo) 72765 2020-AE 1 | 1
1450-0043 | Lampholder (cmo) 0000W
1930-0016 | Tube, electron: 6x4 80131 6x4 1 |1
1932-0030 | Tube, electron: 12AX7 80131 12AX7 1 |1
1933-0007 | Tube, electron: GAU8 80131 6AU8 1 |1
1940-0004 | Tube, electron: OA2 80131 OA2 1 |1
1940-0007 | Tube, electron: OB2 80131 OB2 НМ
2100-0009 | R: var, comp, 25K ohms + 20%, 1/3W 11237 Type 45, obd# 1-14
# See introduction to this section
01138-2 6-9
Section VI Model 413A
Table 6-2
Table 6-2. Replaceable Parts (Cont'd)
# Stock No. Description Mfr, Mfr. Part No, TQ|RS
2100-0022 R: var, ww, lin, 500 ohms + 20%, 1W 11236 Type 112, obd# 111
2100-0078 R: var, ww, lin, 500 ohms + 30%, 3/10W 11237 70C3837 1/1
2100-0136 R: var, comp, lin, 6K ohms + 20%, 3/10W 11237 Type 70, obd# 1/1
2110-0018 Fuse, cartridge: 0.25 amp, s-b, 71400 MDL 1/4
(for 230 volt operation)
2110-0020 Fuse, cartridge: 0.8 amp, s-b, 75915 313-800 1/10
(for 115 volt operation)
2140-0012 Lamp, minat: 2 pin, No. 12 24455 No. 12 515
3100-0290 Switch, rot, 1 sect, 2 pos, w/R8 var resistor 76854 218429-K1P 1/1
3101-0001 Switch, tog: SPST 04009 80994 -H ТРД
3101-0033 Switch, sl: DPDT 42190 4633 1/1
3140-0013 Motor: 6.3, VAC 73061 "Synchron'' Model 1] 1
610 (6.3V)
8120-0050 Cord, power: w/NEMA plug 70903 CS-0041/PH- ТЕ
151/7.5 it
9100-0021 Transformer, power 98734 4076 1/1
MISCELLANEOUS
G-74G Knob, black: 1 in. ZERO CONTROL
G-74N Knob, bar w/arrow RANGE (volts) SWITCH
G-T4AT Knob, red: 3/4 in. bar w/arrow
NORMAL EXPAND SWITCH
412A-37A Light rod: modulator (cmo)
412A-37B Light rod: modulator (rmo)
412A-65A Assy, amplifier
412A-65A-1 Circuit board, amplifier: includes
C108 thru C110
C112
C113
R106 thru R109
R111 thru R114
v101
v102
# See introduction to this section
6-10 01138-2
APPENDIX
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.
00334
00335
00373
00656
02286
02660
02735
02771
02777
03508
03705
03797
03877
03988
03954
04009
04062
04222
04298
04404
04651
04713
04732
04773
04870
05006
05277
05593
05624
05729
057813
06004
06555
06812
07115
07126
01138-1
MANUFACTURER ADDRESS
Humidial Co. Colton, Calif.
Westrex Corp. New York, N.Y.
Garlock Packing Co.
Electronic Products Div. Camden, N.J.
Aarovox Corp. Mew Bedford, Mass.
Amp, Inc. Harrisburg, Pa.
Aircraft Radio fo Boonton, N.J.
Sangam e
Orar, Bree Eon) Marion, II.
Gos Engineering Co. Los Angeles, Calif.
Carl E. Holmes Corp.
Allen Bradley Co.
Litton Industries, Inc.
Pacific Semiconductors, Inc
Los Angeles, Calif.
Milwaukee, Wis.
Beverly Hills, Calif.
Culver City, Calif.
Texas Instruments
Transistor Products “Div.
The Alliance Mfg. Co.
Dallas, Texas
Alliance, Ohio
Chassi-Trak Corp. Indianapolis, Ind.
Pacific Relays, Inc, Yan Nuys, Calif
Amerock Corp. Rockford, 1!
Pulse Engineering Co. Santa Clara, Calif.
Ferroxcube Corp. of America
Saugerties, N.Y.
Cole Mig. Co. Palo Alto, Calif.
Amphenol-Borg Electronics Corp.
Chicago, Ill.
Radio Corp. af Am
Semiconductor pu Materials Di a
rville, N.J.
Vocaline Co. of America, A
Old Saybrook, Conn.
“San Fernando, Calif.
G.E. Semiconductor Products Dep!
Syracuse, N.Y.
Apex Machine & Tool Co. Dayton, Ohio
Eldema Corp El Monte, Calif.
Transitron Electronic Corp. Wakefield, Mass.
Pyrofilm Resistor Co. Morristown, N.J.
Air Marine Motors, Ine. Los Angeles, Calif.
Arrow, Hart and Hegeman Elect. Со,
Hartford, Conn!
Elmanco Products Co. New York, N.Y.
Hi-Q Division of Aerovor Myrtle Beach, S.C.
Elgin National Watch Co.,
lectronies Division
Dymec Division of
Hewlett-Packard Co.
Sylvania (sas Prods., Inc.
Electronic Tube Div. Mountain View, Calif.
Motarale, Inc., Semiconductor
Iv. Phoenix, Arizona
Filtron Co. Ine
Western Division
Automatic Electric Co.
Р М Motor Co.
Twentieth Century Plastics, Inc.
Los Angeles, Calif.
Westinghouse Electric Corp.,
Semi-Conductor Dept.
Hopkins Engineering Co
Burbank, Calif.
Pala Alto, Calif.
Culver City, Calif.
Morthlake, [II
Chicago, Ill.
Youngwood, Pa.
Mumitranic Engineering Co.
Sunnyvale, Calif.
Barber Colman Co. Rockford, HI.
META GES Telecommunications Corp,
. Div. Brooklyn, N.Y.
SI decia Co. rp Cruz, Calif.
The Bridgeport, Conn.
Bassick Co.
Beade Electrical Instrument Co., Inc
“Мое NH.
Torrington Mfg. Co., West Div.
Yan Nuys, Calif.
Corning Glass Works
Electronic Components Dept.
Bradford, Pa.
Digitran Co. Pasadena, Calif.
00015-19
Revised: é December 1961
CODE
NO.
07137
07138
07261
07263
07910
07933
07780
08145
08358
08717
08718
08792
09026
09134
09250
09569
10411
10646
11234
11237
11312
11711
11717
11870
12697
14655
15909
16758
18873
19315
19500
19701
20183
21520
21335
21964
24446
24455
24655
26462
26992
28480
33173
35434
37942
39543
40920
42190
43990
44655
47904
MANUFACTURER ADDRESS
Transistor Electronics Corp,
Minneapolis, Minn.
Naar he ae Electric Dare:
Elec Tube Div Elmira, M.Y
Avnet Co Los Argeles, Calif.
Fairchild Camlcöndueter Corp.
Mountain Viow, Calif.
Continental Device Corp. Hawthorne, Calif.
Rheem Semiconductor Corp.
Mountain View, Calif.
Boonton Radio Corp. Boonton, N.J.
U.S. Engineering Co. Los Angeles, Calif.
Burgess Battery se. ;
jagara Falls, Ontario, Canada
Sloan Company Burbank, Calif.
Cannon Electric Co.
hoenix Div. Phoenix, Ariz.
CBS Electronics Semiconductor
Operations, Div. of C.B.5. Inc.
Lowell, Mass.
Costa Mesa, Calif.
Houston, Texas
Chicago, III,
Babcock Relays, Inc.
Texas Capacitor Co.
Electro Assemblies, i €.
Mallory Ario Co, o
Canad Toronto; Ontario, Canada
Ti-Tal, Ine. Berkeley, Calif.
Carborundum Co. Miagara Sit N.Y.
C15 of Berne, Inc. Berne, Ind.
Chicago Telephone of se ne.
. Pasadena, Calif.
Microwave Electronics des
Palo Alto, Calif.
cer) ZEN ‚Corporation
uctor Division Mewark, N.J.
Tomiie Electronics, Inc. Buena Park, Calif.
Melabs, Inc. o Alte, Calif.
Clarostat Mig. Co Dover, М.Н.
Cornell Dubilier Elec. Corp.
So. Plainfield, N.J,
The Daven Co. Livingston, M.J.
Delco Radio Div. of G. M. Corp.
Kokomo, Ind.
E. |. DuPont and Co., 0. Wilmington, Del.
Eclipse hon Div. o
Bendix Aviation Eo
oma i Edison sos
of McGraw-Edi
West Orange, N.J.
Electra Manufacturing Co. Kansas City, .
Electronic Tube Corp. Philadelphia, Pa.
Fanstoel Metallurgical Corp.
No. Chicago, Ill.
The Fafnir Bearing Co. New Britain, Conn
Fed. Telephone and Radio Corp.
Clifton, N.J.
Schenectady, N.Y,
Teterboro, М...
General Electric Co.
G.E., Lamp Division
Nela Park, Cleveland, Ohio
General Radio Co. Concord, Mass,
Grobet File Co. of America, Inc.
Carlstadt, N.J.
Hamilton Watch Co. Lancaster, Pa.
Hewlett-Packard Co. Palo Alto, Calif.
G.E. Receiving Tube Dept. Owensboro, Ку,
Lectrohm Inc, Chicago, Ill.
P. R. Mallory & Co.,
Inc. Indianapolis, Ind.
Mechanical Industries Prod. Co
Akron, Ohio
Miniature Precision Bearings, Inc,
Keene, N.H.
Muter Co. Chicago, Ill.
C. A. Norgren Co. Englewood, Colo.
Ohmite Mfg. Co. Skokie, IH.
Polaroid Corp. Cambridge, Mass,
CODE
NO.
18620
49956
54294
55076
55933
55738
56137
56287
59446
61775
62119
64959
65092
66346
70276
70309
70485
70563
70903
70998
71002
71041
71218
T1286
71313
71400
71450
71468
71471
71482
71523
71590
71700
71744
71753
71785
71984
72136
72354
72619
72656
72758
72765
72825
72928
72982
73061
73138
73273
73445
73506
73559
73682
73743
73773
73905
74455
MANUFACTURER ADDRESS
Procision Thermometer and
Inst. Co. Philadelphia, Pa.
Raytheon Company Lexington, Mass.
Shallcross Mig. Co Selma, N.C
Simpson Electric Co. Chicago, |!
Sonotone Corp. Elmsford, N.Y
Serenton & Co,, Inc
Spaulding Fibre Со.
Sprague Electric Co.
Telex, Inc
Union Switch cod Signal, Shy
Westinghouse ir Brake
Tonawanda, N.Y.
North Adams, Mass.
St. Paul, Minn.
of
g Co. vull Pa.
Universal Sa Co.
> Mich.
Western Electric Co., Ine. New York MY:
Weston Inst. Div. of Daystrom, Inc.
Newark, N.J.
Wollensak Optical Co. Rochester, N.Y.
Allen Mfg. Hartford, Conn
Allied Control Co., Inc. New York, N.Y.
Atlantic India Rubber Works, Inc.
Chicago, IH.
Amperite Co., Inc. New York, N.Y.
Belden Mfg. Co. Chicago, Ill.
Bird Electronic Corp, Cleveland, Ohio
Birnbach Radio Co. New York, N.Y.
Boston Gear Works Div. of
urray Co. of Texas Quincy, Mass.
Bud Radio Inc Cleveland, Ohio
Camloc Fastener Corp. Paramus, N.J
Allen D. oc Electronic
rod. Plainville, Conn.
Bussmann Tus Div. of MeGraw-
Edison Co. St. Louis, Mo.
CTS Cor Elkhart, Ind.
Cannon Electric Co. Los Angeles, Calif.
Cinema Engineering Co. Burbank, Calif.
C. P. Clare & Co. Chicago, Ill.
AE Thomson Corp.,
ord Mfg. Co. Div. Waltham, Mass.
бе Div. of Globe Union Inc,
Milwaukee, Wis
The Carnish Wire Co. New York, N.Y
Chicago Miniature Lamp Works
Chicago, III.
A. O. Smith Corp., come Div.
est Orange, NJ,
Chicago, III.
Midland, Mich.
Cinch Mfg. Corp.
Dow Corning Corp.
Electro Motive Mfg. Co.,
Матис ‹ Conn.
John E. Fast & Co. Chicago, III.
Dialight Carp. Brooklyn, N. A
General Ceramics Corp. Keasbey, N.J.
Girard-Hopkins Oakland, Calif.
Drake Mfg. Co. Chicago, Ill
Hugh H. Eby Inc. Philadelphia, Pa
Gudeman Co Chicago, III,
Erie Resistor Corp. Erie, Pa.
Hansen Mfg. Co., Inc.
Helipot Div, À Reus
Instruments, |
Princeton, Ind.
Fullerton, Calif,
Hughes Product | Division of
ughes Ajreraft Co. ame Beach, Calif.
Amperax électron c Ce,, Div
North American “Phillips Cor
Hi ckiville, N.Y.
Bradley Semiconductor Corp. Hamden, Conn.
Carling Electric, Inc, Hartford, Conn.
George K. Garrett Co., Inc.
Philadelphia, Pa.
Fischer Special Mig. Co. Cincinnati, Ohio
The General Industries Co. Elyria, Ohio
Jennings Radio Mfg. Co. San Jose, Calif,
J. H. Winns, and Sens Winchester, Mass.
From: F.S.C. Handbook Supplements
H4-1 Dated October 1961
H4-2 Dated November 1961
APPENDIX
Model 413A
CODE LIST OF MANUFACTURERS (Sheet 2 of 2)
Appendix
CODE
NO. MANUFACTURER ADDRESS
748461 Industrial Condenser Corp. Chicago, III.
74868
74970
75042
75173
75378
75382
75818
75915
76005
76210
76433
76487
76493
76530
76545
76854
77068
77221
77342
77630
77638
77764
718283
78471
78488
78553
78790
78947
79142
79251
79727
79963
80031
80130
80131
80207
80246
80294
80411
80484
80583
80640
81030
81415
81453
81483
81860
82042
82142
82170
82209
82219
82376
82387
82647
B7864
i-2
R. a Sa ht of Amphenol-
q Elec s Corp. rev / ps
Es E pe hnso
thai Resistance Co. et =
Jones, Howard B., Division
of Cinch Mfg. Corp Chicago, HI.
James Knig a Sandwich, Il.
Kulka Electric Corporation Mt, Vernon, N.Y.
Lent Electric Mfg. Co. Chicago, III.
Littelfuse Inc. Des Plaines, 111.
Lord Mfg. Co. Erie, Pa.
C. W. Marwed San Francisco, Calif.
Micamold Electronic Mig. Corp
Brooklyn, N.Y.
Malden, Mass.
os Angeles, Calif.
San Leandro, Calif.
Cleveland, Ohio
Chicago, III,
James Millen Mfg. Co., Inc.
J. W. Miller Co.
Manadnack Mills
Mueller Electric Zo
Oak Manufacturing
Bendix Pacific des of
Bendix Corp. No, Hollywood, Calif.
Phaostron Instrument and
Electronic Co. South Pasadena, Calif.
Potter and Brumfield, Diy, of American
Machine and Foundry Princeton, Ind.
Radio Condenser Co. Camden, NJ.
Radio Receptor Co, Inc. Brooklyn, N.Y.
Resistance Products Co. Harrisburg, Pa.
Signal Indicator Corp. New York, N.Y.
Tilley Mfg. Co. San Francisco, Calif.
Stackpole Carbon Co. St. Marys, Pa.
Cleveland, Ohio
Pasadena, Calif.
Tinnerman Products, Inc.
Transformer Engineers
Ucinita Co Newtonville, Mass.
Vesdet Root, Inc. HarHord, Conn.
Wanco Mfg. Co. Chicago, III.
Continental-Wirt Electronics Corp.
Philadelphia, Pa.
Zierick Mfg, Corp. New Rochelle, N.Y.
bape! Division of
Sessions Clock Co. Morristown, NJ.
Times Facsimile Corp. New York, N.Y.
Fe [nsec econ
d tube meeting EIA
stan Ar y Washington, D.C.
Unimax rien Div. of
W.L.M on Corp. Wallinaford, Conn.
Oxford a Corp.
Bourns Laboratories,
Acro Div. of Roberts
Fulton Controls ¿>
Chicago, IH.
Rivarside, Calif.
Columbus 16, Ohio
All Star Products Inc. ce, Chio
Hammerlund Co. Inc. New York, N.Y.
Stevens, Arnold, Co., Ine. Boston, Mass.
International Instruments, Inc.
New Haven, Conn.
Wilkor Products, Inc. Claveland, Ohio
A Mfg. Co., Industrial
nts Div., Industr.
Tube Operations
International Rectifier Corp.
El Segundo, Calif.
Watertown, Mass.
Newton, Mass.
Barry Controls, Inc.
Carter Parts Co Skokie, 111.
Jaffers Electronics Division of
Speer Carbon Co. => = Pa.
Allen B. DuMont Labs, Inc п, М.
Maguire Industries, Inc, ne Co.
Sylvania Ро Prod. Inc.,
c Tube Div. Emporium, Pa.
East Newark, N.J.
Sa, Ine. Chicago, Ill.
Metals and Controls, Inc., Div. of
exas Instruments, Inc,
Spencer Prods.
Research Products Corp.
Astro
Attleboro, Mass.
Madison, Wis.
00015-19
Revised: 6 December 1961
CODE
NO.
82877
82893
83058
83125
83148
83186
83298
83330
83501
83594
83777
83821
84171
84376
84411
84770
854519
85474
85660
859711
86684
87216
87473
88140
89473
87636
89665
70179
90970
91260
91418
91506
91637
91662
91737
91827
91921
72176
93332
93369
93410
93983
94144
94145
94148
94154
94197
94310
94482
95236
95238
95263
95264
95265
95275
MANUFACTURER
Rotron Manufacturina Co,
ADDRESS
Inc.
Woodstock, N.Y.
Glendale, Calif.
Cambridge, Mass.
Vector Electronic Co.
Carr Fastener Co.
Pyramid Electric Co. Darlington, 5.C.
Electro Cords Co. Los Angeles, Calif.
Victory Engineering Corp. Union, N.J
Bendix Corp., Red Bank Div. Red Bank, N.J.
Smith, Herman H,, Inc: Brooklyn, NY.
Savitt Wire and Cable
iv. of Amerace Corp.
Burroughs Corp
Electronic Tube au
Mada! Eng. and Mfg.,
Co.
Brookfield, Mass.
Plainfield, N.J.
Huntington, Ind.
tus, Mo.
New York, N.Y.
Loyd Scruggs Co.
Arco Electronics, Inc.
A. J. Glesener Со, Inc.
Francisco, Calif.
San
Good All Electric Mig. Co. Ogallala, Neb.
Sarkes Tarzian, Inc. Bloomington, Ind.
Boonton Molding Company Boonton, М...
R. M. Bracamonte & Co.
San Francisco, Calif.
Koiled Kords, Inc. New Haven, Cann.
Seamless Rubber Co. Chicago, II.
Radio Corp, el America, RCA
lactron Tube Harrison, N.J.
Philco Carp. En Division)
Lansdale, Pa.
Western Fibrous Glass Products Co.
San Francisco, Son
Cutler-Hammer, Inc. Lincoln, IH.
General Electric Distributing Corp.
Schenectady, N.Y.
Carter Paris Div. of Economy Baler Co.
Chicago, lil,
United Transformer Co. Chicago, III,
U.5. Rubber Co., Mechanical
Goods Div. Passalc, N.J.
Bearing Engineering Co, San Francisco, Calif.
Connor Spring Mfg. Co. San Francisco, Calif.
Radio Materials Co. Chicago, lll,
Augat Brothers. 'Ine. Attleboro, Mass.
Dale Electronics, Inc. Columbus, Nebr.
Elco Corp. Philadelphia, Pa.
Gremar Mfg. Co, Inc. Wakefield, Mass.
K F Davelopment Co. Redwood City, Calif.
Minneapolis- chanel toto ces
Micro-Sw
Universal Metal Products, Inc.
assett Puente, Calif.
Sylvania Electric Prod, Inc,
Semiconductor Div.
Robbins and Myers, Inc.
Stevens Mig. Co., Inc,
Insuline-Yan Norman Ind., Inc.
gr ve ion Manchester, N.H.
Raytheo me oe
iv. Reina ibe Oper
‘серог?, It.
Mansfield, Ohio
Nice , Mass.
Raytheon prie Co, cena Div.
alifornia Streat Flan Newton, Mass.
Scientific Radio Co Inc
Loveland, Colo.
Tung-Sol Electric, Inc. Newark, №...
pe A ion Corp.
Electr Div. East Paterson, N.J.
Tru Ohm à Div. of Model
¡reia an fg. Co.
Worcester Pressed Aluminum Corp:
Worcester, Mass.
Allies Products Corp. Miami, Fla.
Continental Connector Corp. Neha N.Y.
Leacraft Mig. Co., Inc. w York, N.Y.
Larco Electronics, Inc. Burbank, Calif.
National Coil Ca. Sheridan, Wyo.
Yitramon, Inc. Bridgeport, Conn,
Chicago; III.
CODE
NO. MANUFACTURER ADDRESS
95354 Methode Mig. Co. Chicago, Ill.
95787 Weckesser Co. Chicago, Ill.
76067 Huggins Laboratories Sunnyvale, Calif.
246095 HI-Q Division of Aerovox Olean, N.Y.
76256 Thordarson-Meissner Div. of
Maguire Industrias, Inc. Mt. Carmel, Ill.
762976 Solar Manufacturing Ca. Los Angeles, Calif,
76330 Carlton Screw Co Chicago, HI.
96341 Microwave Associates, Inc. Burlington, Mass.
96501 Excel Transformer Co. Oakland, Calif.
97539 Automatic and Precision
Mig. Co. Yonkers, N.Y.
97966 CBS Electronics,
Div. af C.B.5., Ine. a. Mass.
98141 Axel Brothers Inc. amaica, N.Y.
98220 Francis L Mosley енот, Calif.
98278 Microdot, Inc. So. Pasadena, Calif.
98291 Sealectro Corp. Mamaroneck, N.Y.
98405 Carad Corp Redwood City, Calif,
78734 Palo Alto Engineering
Co. Inc Palo Alto, Calif,
98821 North. Hills Electric Co. Mineola, N.Y.
98925 Sa Transistor Prod.
of Clevite Corp. Waltham, Mass.
98978 небе Electronic
Research Corp. Burbank, Calif.
99109 Columbia Technical Corp. New York, N.Y.
99313 Varian Associates Palo Alto, Calif.
99515 Мао, ace Electron
ts Divisio Pasadena, Calif.
99707 Control Switch Division. on Co.
rica El Segundo, Calif.
79800
put Electronics Corp.
99848 Wilco Corporati
99934 Renbrandt, Inc.
99942 Hoffman Semiconductor Div. of
Hoffman Electronics Corp.
Tec y Instrument Corp.
f Calif. Newbury Park, Calif.
East Aurora, N.Y.
Indi lis, Ind
Boston, Mass:
Evanston, II.
99957
THE FOLLOWING H-F VENDORS HAVE NO N
BER ASSIGNED IN THE LATEST SUPPLEMENT "о
THE FEDERAL SUPPLY CODE FOR MANUFACTURERS
HANDBOOK.
0000F Malco Tool and Die
00001 Telefunken (c/o American
Los Angeles, Calif.
; New York, N.Y.
0000L Winchester Electronics, Ine.
Santa Monica, Calif.
poooM Western E Div. of Automatic
Re Food City, Calif,
San Leandro, Calif,
Holliston, Mass.
0000N vu. Spring Co,
0000P Ty-Car Mfg. Co., Inc.
0000T "e [este Inc.
and Controls Div. Versailles, Ky.
0000U rom = тр. Ргоу!Чепсо, R.l.
0000W Webster Mustronies Co. Ine.
New York, N.Y.
Spruca Pine, N.C.
Kansas City, Kans.
Newark, NA.
0000X Spruce Pine Mica Co.
0000Y Midland Mfg. Co. Inc.
0000Z Willow Leather Products Corp.
000A A British Radio Electronics Ltd.
Washington, D.C.
000B8 Precision Instrument Components Co.
an Nuys, Calif.
000 CC Computer Diode Corp. Lodi, N.J.
000D D General Transistor Los Angeles, Calif.
O00EE A, Williams Manufacturing Co.
San Jose, Calif.
O00FF Carmichael Corrugated Specialties
ichmond, Calif.
000 © © Soshen Die Cutting Service Goshen, Ind.
From: F.S.C. Handbook Supplements
H4.1 Dated October 1961
H4-2 Dated November 1961
01138-1
6 MANUAL CHANGES
MODEL 413A
DC NULL VOLTMETER
Manual Serial Prefixed: 139-
Manual Printed: 2/62
To adapt this manual to instruments with other serial prefixes check for errata below, and make
changes shown in tables.
Instrument Serial Prefix Make Manual Changes Instrument Serial Prefix Make Manual Changes
ERRATA Figure 5-16, Powe r Supply schematic diagram,
Center-arm of R8 (ZERO) should be connected to R125, 126 and S101H.
F1 (115V): Change to fuse, cartridge, 0.6 amp, slo-blo (for 115V operation),
@ Stock No. 2110-0016
F1 (230V): Change to fuse, cartridge, 0.4 amp, slo-blo (for 230V operation),
tp Stock No. 2110-0019
Paragraph 5-16, DEMODULATOR
j) should read, Replace DS103 and remove DS104
p) Turn the 413A off and replace DS104 and V102.
Paragraph 5-35, Step a
Change to, 413A or 412A
CHANGE #1 Table 6-1, Replaceable Parts
Change T1 to % Stock No. 9100-0238
Figure 5-16. Power Supply
Change schematic diagram as shown
TO PIN | TO PIN 6 TO DSIOI TO R3
VIO3 VIO3 ETC. ETC.
7 +
TO SI TO CIB & PI
ERRATA Table 1-1, SPECIFICATIONS,
Noise Specification should read, "Noise: Less than 2 mv (RMS)
on any range,"
3/31/64 В Supplement A for
413A-900
Ba
Г.
Instrument Serial Prefix
ERRATA
3/31/64
R
Manual Changes Model 413A Page 2
Make Manual Changes Instrument Serial Prefix
Figure 2-1." 230 Volt Operation,
Change S1 to S2.
Figure 4-1. Model 413A Block Diagram,
Make Manual Changes
Add arrowhead to arc on A103 to indicate clockwise rotation of the light
interrupter.
Paragraph 5-12. Chopper Assembly,
Step c. Delete last sentence.
Figure 5-1. A103, Chopper Assembly,
Change DS104-413AR to DS101-413AR.
Change DS103-413AR to DS102-413AR.
Change DS101-413AR to DS104-413AR.
Change DS102-413AR to DS103-413AR.
Paragraph 5-16. Demodulator,
Step d should read: Connect a 1 uf capacitor across the input terminals
of an ohmmeter.
Paragraph 5-33. Hum Balance,
Step d. First sentence should read: Adjust Hum Bal. (R3) for minimum
(less than 5 millivolts peak to peak) 10 cps signal as seen on oscilloscope.
Paragraph 5-35. Amplifier Gain Calibration and Meter Calibration,
Add the following sentence to Step f: Set voltmeter calibrator range switch
to 1. 0 volt.
Figure 5-8. Amplifier Calibration Test Setup,
Add (System Indicator) under @ 413A DC Null Voltmeter adjacent to the
413A under test.
Paragraph 5-38. Gain Calibration,
Step h. Change to read: m. Adjust Meter Cal. R123 for an end-scale
reading of 1 volt on the 413A under test.
Step i. Change to Step h. and change first sentence to read: Repeat
Steps c through f using positive test voltages ranging from 0. 001 volt
through 300 volts from the voltmeter calibrator.
Step j. Change to Step i and change the two references
Step h.
Change Step k to j and m to k.
Figure 5-15. Model 413A DC Null Voltmeter,
to Step i to read
Change Reference Designators for S101 to S101A, D, F-H.
Add an asterisk to R122.
Add the following to NOTES:
6. * Average value shown, optimum value selected at factory.
Change S101B to S101D.
Add S101A to the undesignated switch sections appearing on the left side
of simplified diagrams of S101A and S101D switching.
Add S101D to the undesignated switch sections appearing on the right side
of simplified diagrams of S101A and S101D switching.
Table 6-1. Reference Designation Index,
Change CR1 to & Stock No. 1902-0206; Diode, breakdown; Mfr. 04713.
Supplement A for
413A-900
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 is ready to assist you in any situation, and you are always wel-
come to get directly in touch with Hewlett-Packard service departments:
CUSTOMER SERVICE OR (In Western Europe)
Hewlett-Packard Company Hewlett-Packard S.A.
395 Page Mill Road 54-54bis Route Des Acacias
Palo Alto, California, U.S.A. Geneva, Switzerland
Telephone: (415) 326-1755 Telephone: (022) 42. 81. 50
TWX No. PAL AL 117-U Cable: "HEWPACKSA"
Cable: "HEWPACK"
00390-2 бр
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