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TM 11-6625-1541-15
DEPARTMENT OF THE ARMY TECHNICAL MANUAL
OPERATOR, ORGANIZATIONAL, DS, GS,
AND DEPOT MAINTENANCE MANUAL
HEWLETT-PACKARD RMS VOLTMETER
MODEL 3400A
HEADQUARTERS, DEPARTMENT OF THE ARMY
MAY 1967
WARNING
DANGEROUS VOLTAGES
EXIST IN THIS EQUIPMENT
Be careful when working the power supplies and their cir-
cuits, or on the 230- or 115-volt ac line connections.
DO NOT TAKE CHANCES!
TM 11-6625-1541-15
Model 3400A TABLE OF CONTENTS Table of Contents
List of Tables
Section Page
I GENERAL INFORMATION 1-0.1
1-A.1 Scope . . . . . . . . . . . . . . . . . . . 1-0.1
1-A.2 Index of Publications . . . 1-0.1 Section Page
V MAINTENANCE . . . . . . . . . . . . ...5-1
1-A.3 Forms and Records . . . . . . .1-0.1 5-1. Introduction . . . . . . . . . . . . . . 5-1
1-3. Description . . . . . . . . . . . . . .1-1 5-3. Test Equipment. . . . . . . . . . . . 5-1
1-8. Specifications. . . . . . . . . . . . . 1-1 5-5. Performance Checks . . . . . . . . . 5-1
1-10. Instrument Identification . . . . . . . 1-1 5-7. Accuracy, Linearity, and DC Output
1-12. Equipment Supplied . . . . . . . . . . 1-1 Performance Checks. . . . . . . 5-1
1-14. Accessory Equipment Available . . . 1-1 5-9. Frequency Response Performance
Section Page Check . . . . . . . . . . . . ...5-2
5-11. Input Impedance Performance
II INSTALLATION . . . . . . . . . . . . ...2-1 Check . . . . . . . . . . . . ...5-2
2-1. Introduction . . . . . . . . . . . . . . 2-1 5-13. Crest Factor Performance Check. 5-3
2-3. Initial Inspection . . . . . . . . . . . 2-1 5-15. Residual Noise Performance
2-5. Power Requirements . . . . . . . . . 2-1 Check . . . . . . . . . . . . ...5-3
2-8. Installation . . . . . . . . . . . . ..2-1 5-17. Repair Procedures . . . . . . . . . . 5-3
2-10. Combining Case Models 1051A 5-18. Cover Removal. . . . . . . . . . . 5-3
or 1052A) . . . . . . . . . . . . . 2-1 5-20. Servicing Etched Circuit Board . . 5-4
2-12. Adapter Frame Part No. 5-23. Thermocouple Replacement . . . . 5-4
5060-0797). . . . . . . . . ...2-1 5-25. Adjustment and Calibration Proce -
2-14. Repackaging for Shipment. . . . . . . 2-1 dure. . . . . . . . . . . . . . . . . . . . 5-5
Section Page M e t e r Z e r o . . . . . . 5-5
III OPERATING INSTRUCTIONS . . . . . . . . 3-1 5-29. Power Supply Checks . . . . . . . 5-6
3-1. Introduction . . . . . . . . . . . . . . 3-1 5-31. Low Frequency Calibration . . . . 5-6
3-3. Controls and Indicators. . . . . . . . 3-1 5-36. High Frequency Calibration . . . . 5-6
3-5. Turn On Procedure . . . . . . . . . 3-1 5-41. Troubleshooting Procedure. . . . . . 5-7
3-7. Operating Instructions . . . . . . . . 3-1 5-50. Neon Subassembly Replacement . . . 5-15
3-9. Applications. . . . . . . . . . . . . . 3-1 Section Page
3-11. RMS Value of AC Signals with DC
Component . . . . . . . . . . . . 3-1 VI CIRCUIT DIAGRAM . . . . . . . . . . . . . . 6-1/6-2
3-13. RMS Current . . . . . . . . . . . . 3-1 6-1. Introduction . . . . . . . . . . . . . 6-1/6-2
3-15. RMS AC-to-DC Converter. . . . . 3-1 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 A1. . . 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
4-48. Neon Lamp Drive Oscillator. . . . 4-3
0 1 7 6 8 - 2 i
TM 11-6625-1541-15
Section I Model 3400A
Figure 1-1 and Table 1-1
Figure 1-1. Model 3400A RMS Voltmeter
Table 1-1. Model 3400A Specifications
RANGE: 12 full scale ranges from 1 mv to 300 v MAXIMUM INPUT: 1000 v peak.
in a 1, 3, 10 sequence. -72 to +52 dbm. INPUT IMPEDANCE: From 0.001 v to 0. 3 v
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