Agilent Technologies 34401A Service Manual Page 98
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Theory of Operation
This chapter is organized to provide descriptions of the circuitry
contained on each schematic shown in chapter 9. A block diagram
overview is provided in this chapter followed by more detailed
descriptions of the circuitry contained in the schematics chapter.
• Block Diagram 93
• Front/Rear Selection 94
• Function Switching 95
• DC Amplifier 96
• Ohms Current Source 98
• AC Circuit 99
• A-to-D Converter 101
• Floating Logic 103
• Earth-Referenced Logic 105
• Power Supplies 106
• Front Panel 107
The self-test procedures are described in chapter 6.
92
- Agilent 34401A 1
- 6 ½ Digit Multimeter 1
- Safety Information 3
- Additional Notices 5
- DECLARATION OF CONFORMITY 6
- Multimeter 7
- The Front Panel at a Glance 8
- Display Annunciators 10
- The Rear Panel at a Glance 11
- In This Book 12
- Contents 13
- Specifications 17
- DC Characteristics 18
- Measuring Characteristics 19
- Chapter 1 Specifications 19
- AC Characteristics 20
- General Information 24
- HOLD Sensitivity: 24
- Product Dimensions 25
- ≤ 150 µV 26
- ≤ 15 µV 26
- ≤ 1.5 µV 26
- Measurement Error 27
- Sensitivity 28
- Resolution 29
- Accuracy 29
- Transfer Accuracy 30
- 24-Hour Accuracy 30
- 90-Day and 1-Year Accuracy 30
- Temperature Coefficients 30
- Quick Start 33
- ERROR annunciator turns on 35
- To Adjust the Carrying Handle 38
- To Measure Voltage 39
- To Measure Resistance 39
- To Measure Current 40
- To Test Continuity 41
- To Check Diodes 41
- To Select a Range 42
- To Set the Resolution 43
- To Make dB Measurements 46
- To Make dBm Measurements 47
- To Trigger the Multimeter 48
- Using an External Trigger 48
- -H.DDD,DDD EFFF 50
- -045.23 mVDC 50
- Agilent System II 51
- Menu Tutorial 53
- Front-Panel Menu Reference 55
- A Front-Panel Menu Tutorial 57
- Chapter 3 Menu Tutorial 58
- On/Off 59
- MEAS MENU is your first 61
- A: , B: , etc.) 61
- Shift < 61
- Auto/Man 63
- Calibration 65
- Procedures 65
- Calibration Procedures 66
- Agilent Calibration Services 67
- Calibration Interval 67
- Recommended Test Equipment 69
- Application 69
- Recommended Equipment 69
- Accuracy Requirements 69
- Test Considerations 70
- Self-Test 71
- ERROR annunciator 71
- Quick Performance Check 72
- Q in the 72
- Zero Offset Verification 73
- Input HI-LO and Sense HI-LO 73
- Gain Verification 75
- AC FILTER slow (MEAS MENU) 76
- Calibration Security Code 79
- Be careful 80
- Calibration Count 81
- Calibration Message 81
- Zero Adjustment 83
- Zero Adjustment Procedure 83
- Gain Adjustment 85
- Gain Adjustment Procedure 86
- – 100 kHz 86
- –10 Vdc Adjustment Procedure 88
- 500 Vdc Adjustment Procedure 89
- RAM U505 90
- MEAS MENU) 90
- ± 400 µA ac 90
- Input Frequency 91
- AC Filter Selected 91
- Settling Time 91
- Understanding Resolution 92
- -045.23 mVDC 93
- Error Messages 95
- out of range 96
- Calibration Error Messages 96
- Theory of 97
- Operation 97
- Theory of Operation 98
- Block Diagram 99
- Front/Rear Selection 100
- Function Switching 101
- DC Amplifier 102
- Input I and 103
- Ohms Current Source 104
- AC Circuit 105
- A-to-D Converter 107
- Floating Logic 109
- Earth-Referenced Logic 111
- Power Supplies 112
- Front Panel 113
- Service 115
- Operating Checklist 117
- Types of Service Available 118
- Repackaging for Shipment 119
- Surface Mount Repair 120
- RS-232 connector 121
- GPIB interface 121
- Installation Procedure 122
- Troubleshooting Hints 123
- Unit is inoperative 123
- Unit fails self-test 123
- Current input is inoperative 124
- Power supply problems 124
- Readings indicate OVERLOAD 124
- Power Supply Minimum Maximum 124
- Readings are inaccurate 125
- Readings show excessive noise 125
- Self-Test Procedures 126
- Power-On Self-Test 126
- Self-Test Descriptions 126
- Replaceable Parts 131
- To Order Replaceable Parts 132
- Backdating and Part Changes 132
- Chapter 7 Replaceable Parts 133
- Agilent 34401A Mainframe 140
- Manufacturer’s List 141
- Backdating 143
- Chapter 8 Backdating 145
- Agilent 34401A Multimeter 145
- Schematics 148
- Binder Edge (LH Page) 151
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