HP 3478A - Technical Manual

To Next Page

TM 11-6625-3071-14

TECHNICAL MANUAL

OPERATOR’S ORGANIZATIONAL, DIRECT SUPPORT,

AND GENERAL SUPPORT MAINTENANCE MANUAL

DILGITAL MULTIMETER

HEWLETT - PACKARD MODEL 3478A

HEADQUARTERS, DEPARTMENT OF THE ARMY

5 MARCH 1985

Main Page

Section Page5
Table of Contents7
Scope10
General Information11
- Introduction11
- Section I, General Information11
- Section II, Installation Procedures11
- Section III, Operation11
- Section IV, Performance Test and 3-70. Calibration11
- Section V, Replaceable Parts11
- Section VI, Backdating11
- Section VII, Service11
- Description11
- Options15
- Accessories Available15
Line Frequency Switch16
- II. Installation16
- Bench Use17
- Bench Use and Rack Mounting17
- Grounding Requirements17
- Power Cords and Receptacles17
Installation16
- Introduction16
- Initial Inspection16
- Power Requirements16
- Line Frequency and Line Voltage Selection16
Line Select Jumper17
Power Cords17
- Rack Mounting18
- HP-IB Interface Connections18
- Address Selection18
- Environmental Requirements18
- Operating and Storage Temperature18
Typical HP-IB System Interconnection18
- Repackaging for Shipment19
HP-IB Connector19
3478A Address Switch19
Operation20
- Introduction20
- General Information20
- AC Power Operation20
- Turn-On20
- Display20
- Input Terminals Cleaning20
3478A Front and Rear Panel Features21
- Front Panel Operation22
- DC Volts Measurements22
Typical Input Measurement Connection22
Typical Current Measurement Connection22
- AC Volts Measurements23
- Resistance Measurements23
Ohms Connections23
- DC Current Measurements24
- AC Current Measurements24
- Ranging24
- Triggering24
- Shifted Operation25
- General25
- Number of Digits Displayed25
Autoranging Points25
- Autozero26
- Self-Test/Reset Operation26
- Calibration26
- Miscellaneous Operations27
- Voltmeter Complete27
- Remote Operation27
  - General27
- 3478A Response to Bus Messages27
Shifted Operations25
Status Byte28
- 3478A Addressing29
- Talk-Only Mode (no Controller)29
- 3478A HP-IB Programming30
A Program Codes31
- Advanced Programming33
Binary Status Byte Definition33
Performance Test and Calibration34
- Introduction34
- Equipment Required34
- DC Volts Test and Calibration34
- AC Volts Test and Calibration35
- Ohms Test and Calibration35
Recommended Test Equipment35
- DC Current Test and Calibration36
- AC Current Test and Calibration36
- Test Cards36
  - Calibration Cycle36
- Test Failure36
- Instrument Set-Up36
- Instrument Specification36
- Specification Breakdown37
- Temperature Coefficient (Reference Temperature)37
- Test Consideration37
- General37
- Ambiguous Region37
Ambiguous Regions37
- Performance Test38
- DC Volts Test38
DC Volts Accuracy Test and Calibration39
- DC Current Test40
DC Common Mode Rejection Test40
- AC Volts Test41
DC Current Accuracy Test and Calibration41
- AC Current Test42
- Ohms Test Limits43
- Ohms Test.4-1043
- Combined Calibration and Performance Tests44
- General44
- Calibrating the 3478A45
- Calibration Messages46
- Calibration Procedures46
- DC Volts Calibration and Test46
- DC Current Calibration and Test48
- AC Volts Calibration and Test49
AC Current Accuracy Test and Calibration43
4-Wire Ohms Connection43
AC Volts Calibration and Test50
- AC Current Calibration and Test51
- Ohms Calibration and Test51
Ohms Calibration and Test52
Replaceable Parts62
Section Page62
Introduction62
Ordering Information62
Non-Listed Parts62
Parts Changed62
Propriety Parts62
3478A Disassembly Procedure63
Front Panel Assembly69
3478A Mechanical and Miscellaneous Parts69
Backdating70
- Introduction70
Service71
Introduction71
Safety Consideration71
Recommended Test Equipment71
Miscellaneous Information71
Instrument Disassembly (PC Board Replacement)71
Fuse Replacement71
Service Groups71
Troubleshooting72
Introduction72
3478A Self-Test72
Service Group Selection72
ADC Volts and DC Current Troubleshooting72
D A/D Converter and Logic Troubleshooting72
E Power Supplies and Reference72
F Theory of Operation72
3478A Service Groups72
DC/Ohms Input Amplifier73
AC Volts and AC Current Troubleshooting79
Ohms Troubleshooting81
- Troubleshooting81
Circuitry85
- A/D Converter and85
- Flowchart86
- Power Supplies93
- AC to DC Converter97
- Slope +0 and -107
- Power-On Circuitry112
- Reset Circuitry113
- APPENDIX A List114
- Schematics118
Slopes107
Diagram118
- 3478A Block Diagram118
- Input Circuitry and118
- Interface Connection and Bus Structure120
A-2. HP-IB Worksheet121
3478A Front Panel View135
3478A Rear Panel View135
3478A Bottom View135
3478A Left Side View135
Front Panel Bracket View136

HP 3478A - Technical Manual

Table of Contents

Other manuals for HP 3478A

Related product manuals