Keysight Technologies 34970A - Theory of Operation

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Keysight 34970A/34972A Data Acquisition/Switch Unit

Service Guide

125

5 Theory of Operation

Theory of Operation 126

System Block Diagram 127

Floating Logic 128

Memory 131

Earth-Referenced Logic 132

Power Supplies 133

Front Panel 135

Backplane 136

Internal DMM 137

Switch Modules 146

Multifunction Module 162

Main Page

Copyright Notice2
Declaration of Conformity2
Safety Information2
Technology Licenses2
Software Updates/Licenses3
Safety Symbols4
General5
- Before Applying Power5
- Ground the Instrument5
- Do Not Operate in an Explosive Atmosphere5
- Do Not Remove the Instrument Cover6
- Do Not Modify the Instrument6
- In Case of Damage6
Safety Considerations5
Environmental Conditions7
Regulatory Markings8
Sales and Technical Support9
Waste Electrical and Electronic Equipment (WEEE) Directive9
- Product Category9
The Front Panel at a Glance11
The Front-Panel Menu at a Glance12
Display Annunciators14
The 34970A Rear Panel at a Glance16
The 34972A Rear Panel at a Glance17
The Plug-In Modules at a Glance18
A Multifunction Module20
In this Book21
Table of Contents23
Specifications29
1 Specifications30
Quick Start32
- To Prepare the Instrument for Use33
- Quick Start33
- To Connect Wiring to a Module34
- To Set the Time and Date36
- To Configure a Measurement Channel37
- To Monitor a Single Channel38
- To Close a Channel39
- If the Instrument Does Not Turn on41
- To Adjust the Carrying Handle43
- To Rack Mount the Instrument44
Front-Panel Overview48
- Front-Panel Menu Reference49
- Front-Panel Overview49
- To Unsecure for Calibration52
- To Secure against Calibration53
- To Change the Security Code54
- Error Messages55
- To Perform a Zero Adjustment56
- To Apply MX+B Scaling to Measurements57
- To Read the Relay Cycle Count58
- To Read a Digital Input Port59
- To Write to a Digital Output Port60
- To Read the Totalizer Count61
- To Output a DC Voltage62
Calibration Procedures64
- Keysight Technologies Calibration Services66
- Calibration Interval66
  - Adjustment Is Recommended66
- Time Required for Calibration67
- Automating Calibration Procedures67
- Recommended Test Equipment68
- Input Connections69
- Calibration Security71
  - To Unsecure the Instrument Without the Security Code72
- Calibration Message74
- Calibration Count74
- Calibration Procedure75
- Aborting a Calibration in Progress75
- Test Considerations76
- Performance Verification Tests77
  - Self-Test78
  - Quick Performance Check79
  - Performance Verification Tests79
- Internal DMM Verification Tests80
  - Zero Offset Verification80
  - Gain Verification82
- Optional AC Performance Verification Tests87
- Internal DMM Adjustments88
  - Zero Adjustment88
  - Gain Adjustment89
- VDC Adjustment Procedure (Optional)92
- Plug-In Module Test Considerations94
- Relay Verification95
  - Relay Cycle Count95
  - (Optional) 34901A Relay Contact Resistance Verification96
  - (Optional) 34902A Relay Contact Resistance Verification103
  - (Optional) 34903A Relay Contact Resistance Verification108
  - (Optional) 34904A Relay Contact Resistance Verification109
  - (Optional) 34905/06A Relay Contact Resistance Verification112
  - (Optional) 34908A Relay Contact Resistance Verification113
- Thermocouple Reference Junction (Optional)119
  - Thermocouple Reference Junction Verification119
  - Thermocouple Reference Junction Adjustments120
- 34907A Analog Output122
  - Analog Output Verification Test122
  - Analog Output Adjustment123
  - 5 Theory of Operation125
Theory of Operation Theory of Operation126
- System Block Diagram127
- Floating Logic128
- Memory131
- Earth-Referenced Logic132
- Power Supplies133
- Front Panel135
- Backplane136
  - Analog Bus136
  - Digital Bus136
- Internal DMM137
- Switch Modules146
- Multifunction Module162
Service169
- Service170
- Service Service170
- Operating Checklist171
- Types of Service Available172
- Cleaning173
- Repackaging for Shipment173
- Electrostatic Discharge (ESD) Precautions174
- Surface Mount Repair174
- To Replace the Power-Line Fuse175
- Troubleshooting Hints175
- Self-Test Procedures179
- Disassembly184

Keysight Technologies 34970A - Theory of Operation

Table of Contents

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