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3400A


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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
       (Usable indications to 100 



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