MANUAL CHANGES MODEL 3400A RMS VOLTMETER

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP70B00584R000100250001-6
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 58
• Document Creation Date: December 9, 2016
• Document Release Date: April 21, 2001
• Sequence Number: 1
• Publication Date: August 24, 1965
• Content Type: BOOK

Approved For Rel se 2001/05/07 : CIA-RDP70B00584R000100250001-6
(&b-MANUAL CHANGES
MODEL 3400A
RMS VOLTMETER
Manual Serial Prefixed: 401-
-hp- Part No. 3400A-902
To adapt this manual to instruments with other serial prefixes check for errata below, and make
changes shown in tables.
n New or Revised Item.
Instrument Serial Prefix Make Manual Changes
ALL
ERRATA
401-02126 and above
Change 1
528-
Change 1, 2
Table 1-1, Specifications:
1. Change Table 1-1 according to the information given below:
CREST FACTOR: 10 to 1 at full scale, except where limited by maximum
input, inversely. . .
MAXIMUM INPUT: 1000 v peak.
OVERLOAD: With 10 to 1 crest factor, 30 db or 1000 v peak, whichever
is less on each range.
Operating Instructions, Section III:
- 1. Insert between Paragraphs 3-7 and 3-8 the following caution:
DO NOT MEASURE SIGNAL ABOVE 100 VOLTS WITH
10 TO 1 CREST FACTOR. OTHERWISE, THE MAXI-
MUM INPUT RATING (1000 VOLTS PEAK) WILL BE
EXCEEDED. WHEN MEASURING SIGNALS UP TO 100
VOLTS RMS WITH A 10 TO 1 CREST FACTOR, USE
THE BNC TO DUAL BANANA JACK, ACCESSORY
10110A, SUPPLIED WITH THE INSTRUMENT, OR
OTHER INPUT TEST LEADS AND CONNECTIONS THAT
WILL WITHSTAND THE MAXIMUM INPUT OF 1000
VOLTS PEAK.
2. Insert between steps b and c of Paragraph 3-8 the following caution:
WHEN MEASURING AN AC SIGNAL SUPERIMPOSED ON
A DC LEVEL, ALWAYS SET THE RANGE SWITCH TO
THE 300 VOLT POSITION BEFORE MAKING THE INI-
TIAL CONNECTION TO A CIRCUIT SINCE A HIGH VOLT-
AGE TRANSIENT DUE TO THE APPLICATION OF A DC
VOLTAGE WILL DAMAGE THE INPUT CIRCUITRY.
Paragraph 3-15:
1. Change title to read: RMS AC-TO-DC CONVERTER.
- Paragraph 4-31:
1. Change the third sentence to read: Diodes CR602 and CR603 are biasing
diodes for Q602 and Q603 respectively.
Paragraph 5-10:
1. Change step d to read: Adjust oscillator output frequency for 400 cps;
adjust oscillator output amplitude for full-scale deflection on the Model
3400A.
24 August 1965 L Supplement A for
Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6 3400A-902
 Approved For Release 20Q1105107 : CIA-RDP70B00584R000100250001-6
I anua Changes model 3400A Page 2
Instrument Serial Prefix Make Manual Changes Instrument Serial Prefix Make Manual Changes
ALL
ERRATA
401-02126 and above
Change 1
528-
Chan a 1, 2
ERRATA (Cont'd): - Table 5-6, Troubleshooting Procedure:
1. Chanr?e the voltage in check ? , step a, second sentence, to read: -1.0 v
(-0. 15 v for 1/10 scale deflection).
2. Chan e check (0) to read: Measure ac signal to Second Attenuator to nega-
tive end of C205. Reading should be between 90 my and 100 mv.
3. Change figures in Table 5-6 according to the following:
Fi;rure 5-6, Vert = 0. 5 volts/cm.
Fi dare 5-9, Vert = 2 volts/cm.
Figures 5-10 and 5-11, invert the waveform.
NOTE
Waveforms shown in Section V are typical and may
vary in amplitude and/or width from instrument to
instrument.
Figure 6-2, Video Amplifier A4 Schematic:
1.
Connect the base of Q403 to junction of R401 and R431 and remove the
connection. between the emitter of Q402 and the base of Q403.
-
2.
Change voltage on base of Q401 to -0. 79.
- Figure 6-3, Chopper Amplifier A6 Schematic:
1.
Change the voltage at the base of Q604 and Q605:
Q604, FS -1.0
1/10 S -0.15
Q605, FS = -1.6
1/10S= -0.75
2.
Change R8 on the 1/10 SCALE ADJ divider to 430* ohms.
Figure 6-4, Power Supply A7 Schematic:
1. Chancre voltage on CR715 to 17.8 v breakdown.
Tables 7-1 and 7-2:
1.
Transpose the description of CR701 and CR702 with the description of
CR715.
2.
Change description of Q604 to read:
Transistor: Si, 2N3391, NPN.
.
3.
Change description of Q605 to read:
Transistor: Si, 2N3638, PNP.
-
4.
Add asterisk to R8.
-
5.
Change A5 Part No. to read: 1990-0017.
.
6
Add to descri
tion of A5
.
p
:
NOTE
Matched neon subassembly (DS501 and DS502) avail-
able under -hp- Part No. 5082-5168.
-
7.
Change C428 thru C602 to:
C4 8 thru C600 and add: C601, -hp-- Part No. 0180-0081, C: fxd, elect,
Ta, 50 gf +20% -15%, 10 vdcw.
C6(02, -hp- Part No. 0180-0064, C: fxd, elect, 35 gf +100% -10%, 6 vdcw.
Tables 7-1 and 7-2:
1.
Change Part No. and description of Q405 to read:
Si PNP.
1853-0009, Transistor:
2.
Change Part No. and description of CR401 to read:
1901-0025, Diode: Si
100 piv.
,
3.
Change Part No. and description of CR715 to. read:
breakdown, 17.4 ?2% 400 mw.
1902-3223, Diode: Si,
24 August 1965 L Supplement A for
Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6 3400A-902
 Approved For Release 20jQIMJQYhaCgIA-RMYG 8 0?100250001-6
Instrument Serial Prefix Make Manual Changes
ALL
ERRATA
401-02126 and above
Change 1
528-
Change 1, 2
Instrument Serial Prefix Make Manual Changes
Table 1-1, Specifications:
1. Change Table 1-1 according to the information given below:
POWER: 115 or 230 v ?10%, 50 to 1000 cps, . . . .
Figure 6-4, Power Supply A7:
1. Replace Figure 6-4 with Figures B and C in this change sheet.
Tables 7-1 and 7-2:
1. Change R701 and R702 to read: 0687-5631, R: fxd comp 56 K.
2. Add the following components:
Ref. Des.
-hp- Part No.
Description
R715
0687-2241
R: fxd comp 220 K ?10% 1/2 w
R713
0686-2225
R: fxd comp 2. 2 K ?5% 1/2 w
Q706
1854-0022
Transistor: Si NPN
CR718
1902-0046
Diode: breakdown 7. 15 v ?10% 400 mw
CR719
1901-0028
Diode: Si 400 piv
C711
0160-0167
C: fxd 0.082 ?f ?10%
C712
0180-0282
C: fxd Al elect 35 ?f +75% -10% 250 vdcw
Section V, Maintenance:
1.
Figures 5-12 and 5-13 no.longer apply.
2.
Figure A of this change sheet illustrates a proper neon voltage waveform
observed across either pin 3 or 5 on the A6 assembly and chassis ground.
Section IV, Theory of Operation:
1. Any reference in Section IV to the neon lamps being driven by line voltage
and/or at line frequency should be changed to concur with the paragraph
added below:
4-48. NEON LAMP DRIVE OSCILLATOR.
4-49. The neon lamp drive oscillator consists of transistor Q706, diode
CR718, resistors R701, R702, R712, R713, and capacitor C711. Tran-
sistor Q706 is held on (conducting) by the base bias developed at the
junction of R712 and CR718. The collector current of Q706 charges up
capacitor C711 through R701 or R702 depending upon the illuminated neon
lamp on the Chopper Amplifier Assembly A6. When the capacitor
reaches a sufficient charge to fire the dark neon lamp, the illumination
of the neon lamps alternate and the capacitor discharges through the pre-
viously dark neon lamp. With the previously dark neon lamp illuminated,
the capacitor charges up in the opposite direction until firing the pre-
viously illuminated neon lamp. The cycle described above repeats at a
frequency of 90 to 100 cps as determined by the RC time constant of R701,
C711, and R702, and C711.
24 August 1965 L Supplement A for
3400A-902
Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
 Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
Manual Changes Model 3400A Page 4
24 AuguPp1ved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-% upplement A for
3400A-902
 Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
Manual Changes Model 3400A Page 5
ALL
ERRATA
401-02126 and above
Change 1
528-
Change 1, 2
03400-66507
C
C R721 '=D C
CR711
C CR712 D
CC 177177 J
CR713J C R702 ID
C R 151D C =R701 1D
=W704 EC R705 7 C
C CRCR 16 = G
CR 332 J
CR704---)
Cc o D
n
GR710 x R711
VQ
Jul
ERRATA: Figure 6-3, Schematic:
1. Delete Part No. 5082-5001 for the modulator assembly A5.
C R 006 D C R712 O
G
C C70 R718
_ CR715~ r!J_
C C 4=D
CR 27 0D R113In
11 1
1
j
C C709
CR718
L[F
V V
C710
CR tv R716 J
Supplement A for
3400A-902
Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
 Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
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 THAT ITS CALIBRATION
MEASUREMENTS ARE TRACEABLE TO THE
NATIONAL BUREAU OF STANDARDS TO THE
EXTENT ALLOWED BY THE BUREAU'S CALI-
BRATION FACILITY.
Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
 Approved For Release 2001/05/07 : Cl
W
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 nearest Hewlett-
Packard field office 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 nearest Hewlett-Packard field office 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
Hewlett-Packard Company
395 Page Mill Road
Palo Alto, California, 94306
U.S.A.
Telephone: [phone]
TWX No. [phone]
Cable: "HEWPACK"
OR (In Western Europe)
Hewlett-Packard S.A.
54 Route Des Acacias
Geneva, Switzerland
Telephone: [phone]
Cable: "HEWPACKSA"
Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
 Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
 Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
OPERATING AND SERVICE MANUAL
(! PART NO. 3400A-902
MODEL 3400A
RMS VOLTMETER
Appendix C, Manual Backdating Changes, adapts
manual to serials below 401-01826 and serials
prefixed 322-.
L # 1
01768-1 Printed: JAN 1965
Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
 Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
Model 3400A
Table of Contents
List of Tables
TABLE OF CONTENTS
Section Page
I GENERAL INFORMATION . . . . . . . . . 1-1
1-1. Introduction . . . . . . . . . . . . . . 1-1
1-3. Description . . . . . . . . . . . . . . 1 1
1-8. Specifications . . . . . . . . . . . . . 1-1
1-10. Instrument Identification . . . . . . . 1-1
1-12. Equipment Supplied . . . . . . . . . . 1-1
1-14. Accessory Equipment Available . . . 1-1
Section Page
II INSTALLATION . . . . . . . . . . . . . . . 2-1
2-1. Introduction . . . . . . . . . . . . . . 2-1
2-3. Initial Inspection . . . . . . . . . . . 2-1
2-5. Power Requirements . . . . . . . . . 2-1
2-8. Installation . . . . . . . . . . . . 2-1
2-10. Combining Case ( Models 1051A
or 1052A) . . . . . . . . . . . 2-1
2-12. Adapter Frame (~P Part No.
5060-0797) . . . . . . . . . . . . 2-1
2-14. Repackaging for Shipment. . . . . . . 2-1
Section Page
III OPERATING INSTRUCTIONS . . . . . . . . 3-1
3-1. Introduction . . . . . . . . . . . . . . 3-1
3-3. Controls and Indicators. . . . . . . . 3-1
3-5. Turn On Procedure . . . . . . . . . . 3-1
3-7. Operating Instructions . . . . . . . . 3-1
3-9. Applications . . . . . . . . . . . . . . 3-1
3-11. RMS Value of ACSignals with DC
Component . . . . . . . . . . . . 3-1
3-13. RMS Current . . . . . . . . . . . . 3-1
3-15. RMS to AC-to-DC Converter . . . . 3-1
Section Page
V MAINTENANCE . . . . . . . . . . . . . . . 5-1
5-1. Introduction . . . . . . . . . . . . . . 5-1
5-3. Test Equipment . . . . . . . . . . . . 5-1
5-5. Performance Checks . . . . . . . . . 5-1
5-7. Accuracy, Linearity, and DC Output
Performance Checks . . . . . . . 5-1
5-9. Frequency Response Performance
Check . . . . . . . . . . . . . . . 5-2
5-11. Input Impedance Performance
Check . . . . . . . . . . . . . . . 5-2
5-13. Crest Factor Performance Check. 5-3
5-15. Residual Noise Performance
Check . . . . . . . . . . . . . . . 5-3
5-17. Repair Procedures . . . . . . . . . . 5-3
5-18. Cover Removal. . . . . . . . . . . 5-3
5-20. Servicing Etched Circuit Board . . 5-4
5-23. Thermocouple Replacement . . . . 5-4
5-25. Adjustment and Calibration Proce-
dure. . . . . . . . . . . . . . . . . . 5-5
5-27. Mechanical Meter Zero . . . . . . 5-5
5-29. Power Supply Checks . . . . . . . 5-6
5-31. Low Frequency Calibration . . . . 5-6
5-36. High Frequency Calibration . . . . 5-6
5-41. Troubleshooting Procedure . . . . . . 5-7
Section Page
VI CIRCUIT DIAGRAM . . . . . . . . . . . 6-1/6-2
6-1. Introduction . . . . . . . . . . . 6-1/6-2
6-3. Schematic Diagrams . . . . . . . 6-1/6-2
6-6. Parts Location Diagrams . . . . . 6-1/6-2
Section Page
IV THEORY OF OPERATION. . . . . . . . . . 4-1
4-1. Introduction . . . . . . . . . . . . . . 4-1
4-3. General Description. . . . . . . . . . 4-1
4-11. Detailed Description . . . . . . . . . 4-1
4-12. Input Attenuator Assembly Al. . . 4-1
4-15. Impedance Converter Assembly A2. 4-1
4-19. Second Attenuator Assembly A3. . 4-2
4-22. Video Amplifier Assembly A4. . . 4-2
4-27. Modulator/Demodulator Assembly
A5, Chopper Amplifier Assembly,
and Thermocouple Pair Assembly
(part of A4) . . . . . . . . . . . . 4-2
4-37. Power Supply Assembly A7 . . . . 4-3
4-40. Regulator Operation . . . . . . . . 4-3
Section Page
VII REPLACEABLE PARTS. . . . . . . . . . . 7-1
7-1. Introduction . . . . . . . . . . . . . . 7-1
7-4. Ordering Information . . . . . . . . . 7-1
7-6. Non-Listed Parts . . . . . . . . . 7-1
Appendix
A CODE LIST OF MANUFACTURERS
Appendix
B SALES AND SERVICE OFFICES
Appendix
C MANUAL BACKDATING CHANGES
Number Page
1-1. Model 3400A Specifications . . . . . . . . 1-0
1-2. Equipment Supplied . . . . . . . . . . . . 1-1
1-3. Accessory Equipment Available. . . . . . 1-1
5-1. Required Test Equipment . . . . . . . . . 5-0
5-2. Accuracy, Linearity, and DC Output
Performance Check, Supplemental
Data . . . . . . . . . . . . . . . . . . . . 5-1
Number Page
5-3. Frequency Response Performance Check,
Supplemental Data . . . . . . . . . . . . 5-2
5-4. Power Supply Checks . . . . . . . . . . . 5-5
5-5. Front Panel Symptoms. . . . . . . . . . . 5-7
5-6. Troubleshooting Procedure . . . . . . . . 5-9
7-1. Reference Designation Index. . . . . . . . 7-9
7-2. Replaceable Parts . . . . . . . . . . . . . 7-9
01768-1 Approved For Release 2001/05/07 : CIA-RDP70BOO584R000100250001-6 iii
 Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
Model 3400A List of Illustrations
Number Page
1-1. cep Model3400ARMS Voltmeter. . . . . . . 1-0
3-1. Model 3400A Controls and Indica-
tors . . . . . . . . . . . . . . . . . . . . 3-0
4-1. Simplified Block Diagram . . . . . . . 4-0
5-1. Accuracy, Linearity, and DC Output Test
Setup . . . . . . . . . . . . . . . . . . . 5-1
5-2. Frequency Response Test Setup. . . . . . 5-2
5-3. Crest Factor Test Setup. . . . . . . . . . 5-3
5-4. Model 3400A Modular Cabinet. . . . . . . 5-4
5-5. Troubleshooting Tree . . . . . . . . . . . 5-8
5-6. Input to Demodulator. . . . . . . . . . . . 5-9
5-7. Input to Demodulator. . . . . . . . . . . . 5-9
5-8. Input to Demodulator. . . . . . . . . . 5-10
5-9. Demodulator Input (Overdriven) . . . . . . 5-11
5-10. Demodulator Output (Normal) . . . . . . . 5-11
5-11. Demodulator Output (Overdriven) . . . . . 5-12
Number Page
5-12. Chopper Neon Voltage. . . . . . . . . . . 5-13
5-13. Chopper Neon Voltage. . . . . . . . . 5-13
5-14. Output of Modulator (Overdriven) . . . . . 5-13
5-15. Collector of Q601 . . . . . . . . . . . . . 5-14
5-16. Collector of Q602 . . . . . . . . . . . . . 5-14
5-17. Collector of Q603 . . . . . . . . . . 5-14
6-1. Input Attenuator Al, Impedance Converter
A2, and Second Attenuator A3 Schematic
and Parts Location Diagram . . . . . . . 6-3
6-2. Video Amplifier A4, Schematic and Parts
Location Diagram . . . . . . . . 6-4
6-3. Modulator /Demodulator A5, Chopper Am-
plifier A6, and Thermocouple Pair (Part
of A4) Schematic and Parts Location Dia-
gram . . . . . . . . . . . . . . . . . . 6-5
6-4. Power Supply A7 Schematic Diagram . . . 6-6
01768-1Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6 v
 Approved For Release 2001/05/07 : CIA-RDP70B00584R000100250001-6
Section I
Figure 1-1 and Table 1-1
Figure 1-1. l Model 3400A RMS Voltmeter
RANGE: 12 full scale ranges from 1 my to 300 v
in a 1, 3, 10 sequence. -72 to +52 dbm.
(Usable indications to 100 ?v. )
METER SCALES: Voltage, 0. 1 to 1 and 0. 3 to 3.
ohms). Scales are individually calioratea to
the meter movement.
FREQUENCY RANGE: 10 cps to 10 Mc.
ACCURACY: Within ?1% of full scale, 50 cps to
?5% of full scale, from 10 to 50 cps and from
me.)
RESPONSE: Responds to rms value (heating value)
of the input signal for all waveforms.
CREST FACTOR: (ratio of peak amplitude to rms
proportional to pointer deflection, e. g. 20 to 1
MAXIMUM INPUT: 425 v rms.
INPUT IMPEDANCE: From 0. 001 v to 0. 3 v
Range: 10 megohms shunted by 40 pf. From
1. 0 v to 300 v Range: 10 megohms shunted by
15 pf.
RESPONSE TIME: Typically