Fluke 8012A - Page 12

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OPERATION

OPERATING

TECHNIQUES

Figure

2-4.

AC/DC

Current

Operation

yiu

Main Page

Options and Accessories3
Specifications3
Operation8
Setting up Your Instrument8
Unpacking8
AC Line Voltage Requirements8
Front Panel Features9
LCD Display9
Controls, Indicators and Connectors9
Lcd10
Signal Input Limits11
Operating Techniques11
AC/DC Voltage11
AC/DC Current11
Resistance Operation13
Initial Checkout Procedure14
Conductance14
Diode Test14
Low Ohms Resistance14
Applications15
Circuit Loading Error15
Burden Voltage Error16
Test Lead Compensation16
Diode Test Operation16
High Resistance Measurements17
Leakage Resistance Measurements17
DC Voltage Measurements17
AC Voltage Measurements17
Conductance to Resistance Conversion18
Conversion Scales18
Transistor Beta Test Fixture19
Transistor Tester19
Defective Transistors19
True-RMS Measurements20
Waveform Comparison20
Transistor Leakage Test20
Transistor Beta Test20
Combined AC and DC Signal Measurements22
Affects of Offset in AC Measurements22
Bandwidth Limitations in AC Voltage Measurements22
Crest Factor22
Theory of Operation23
Functional Description23
Circuit Descriptions23
Digital Voltmeter23
Basic Block Diagram24
A/D Converter Simplified Schematic and Timing Diagram25
Digital Controller26
The Display26
Input Signal Conditioners26
True RMS Converter27
Voltage Conditioner27
Current Conditioner28
Conductance Conditioner28
Range Switches28
Meter Protection Circuits28
Resistance/Conductance Measurement Protection29
Current Measurement Protection29
Power Supply29
Touch and Hold Circuit29
Interior Access32
Service Information32
General Information32
Maintenance32
Low Ohms PCB Removal33
Main PCB Access33
List of Recommended Test Equipment33
Front Panel Removal34
Removing the Ma Input Line34
Display Removal35
Cleaning35
Special Test Devices35
Performance Test36
Display Test36
Resistance/Conductance Test36
AC Voltage Test37
DC Voltage Test37
RMS Converter Offset Test37
LO Range Test37
AC Current Test38
10A Current Test38
Calibration Adjustment Locations38
Calibration Procedure39
Power Supply Check39
DC Calibration Adjustment39
Power Supply Voltages39
RMS Converter DC Offset Adjustment40
AC Calibration Adjustment40
LO RANGE Calibration Adjustment40
Troubleshooting41
List of Replaceable Parts42
Parts Ordering43
Final Assembly44
Main PCB Assembly45
Table of Contents52
Y820554
Ruggedized Carrying Case 600-154
Accessories54
Soft Carrying Case 600-154
- Probe Accessories55
- Touch-Hold Probe 80T-H55
- Temperature Probe55
- AC Current Probe55
Moo- 200-655
Center Mounting Kit55
Dual Mounting Kit55
- High Voltage Probe56
- Current Shunt56
- Probe Accessories Specifications59
H Touch-Hold Probe 600-259
AC Current59
Probe 600-259
AC Current Probe 600-259
High Voltage Probe 600-360
- Rechargeable Battery Option62
- Battery Charging62
- BT Annunciator62
- Line Frequency Noise Rejection63
- Battery Replacement63
- Fuse Replacement63
- AC Line Voltage Selection63
- Schematic Diagrams69

Fluke 8012A - Page 12

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