Keithley 197 - Page 2

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Instruction Manual

Model

197

Autoranging Microvolt

DMM

Keit hley Instruments, Inc.

Cleveland,

Ohio,

U.S.A.

Document Number 197-901-01

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Main Page

Table of Contents4
Introduction10
- Features10
Safety Symbols and Terms10
Section 1-General Information10
Warranty Information10
- Manualaddenda10
Initial Operation11
Specifications11
- Unpacking and Inspection11
Using the Model 197 Manual11
Accessories12
- Section 2-Bench Operation13
High Energy Circuit Safety Precautions13
Introduction13
Preparation for Use13
- Linepower13
- Batterypackpower14
- Battery Charging14
Front Panel Familiarization14
- Display14
- Front Panel Controls15
- Input Terminals15
- Current Fuse Replace15
Basic Bench Measurements16
- Powerup17
- Relative Mode17
Errormessages16
Operating Conditions16
- Environmental Conditions16
- Maximum Allowable Inputs16
- Warmup16
Model 197 Maximum Allowable Inputs17
- Ent18
- TRMS AC Voltage Measurements18
DC Voltage Measurements18
- Microvolt Measurement Considerations19
TRMS AC Voltage Measurements19
- Resistance Measurements20
- Current Measurements (DC or TRMS AC)21
Four Terminal Resistance Measurement21
Four Terminal Zeroing21
- AC Plus DC Measurements22
- Db Measurements22
Two Terminal Resistance Measurement21
Current Measurements between 222
Current Measurements up to 2000Ma22
- Db Measurements Considerations and Applicatio24
Levels for Other Reference Impedances24
- MIN/MAX and 100 Point Data Logger Operatio25
- Diode Test25
TRMS Considerations25
- AC Voltage Offset26
- TRMS Measurement Comparison26
- Crestfactor26
- Extended Frequency Response26
Comparison of Average and TRMS Meter Readings28
- Section 3- Performance Verification29
Initial Conditions29
Recommended Test Equipment29
Verification Procedure29
- DC Voltage Accuracy Check30
- AC Voltage Accuracy Check30
Connections for ACV Verification30
- Resistance Accuracy Check31
Connections for DCV Verification30
Limits for DC Voltage Verification30
Limits for AC Voltage Verification31
Limits for Resistance Verification31
- DC Current Accuracy Check32
Limits for DC Current Verification32
- AC Current Accuracy Check33
Connections for DC Current Verification (2000Ma to 20A)33
Connections for DC Current Verification (200Pa to 2000Ma)33
Limits for AC Current Verification34
- Section 4-Theory of Operation35
Analog Circuitry35
- Multiplexer35
- Input Buffer Amplifier35
Introduction35
Overall Functional Description35
JFET Multiplexer37
Simplified Schematic of the Input Buffer Amplifier37
Input Configuration During 2- and 4-Terminal Resistance Measurements38
- AC Converter39
Resistance Measurement Simplified Circuit39
- Pia40
- Display Board40
Digital Calibration40
Model 1978 Battery Option41
- Section 5-Maintenance42
Battery Pack (Model 1978) Installation42
Introduction42
Top Cover Removal/Installation42
Fuse Replacement43
- Line Fuse Replacement43
- Current Fuse Replacement43
Line Voltage Selection43
Model 197 Miscellaneous Parts44
Front Panel Calibration45
- Recommended Calibration Equipment45
- Environmental Conditions45
- DC Voltage Calibration46
- AC Voltage Calibration46
- Frequency Compensation46
DC Voltage Calibration Configuration46
AC Voltage Calibration Configuration47
- Resistance Calibration48
- Calibration Storage48
Troubleshooting49
- Powerupsequence49
- Self Diagnostic Program49
- Power Supply and Battery Pack (Model 1978) Checks50
A / D Converter and Display50
- Signal Conditioning50
Segment Identification50
Model 197 Troubleshooting Mode52
Special Handling of Static Sensitive Devices52
A / D Converter54
- Section 6-Replaceable Parts55
Model 197 Static Sensitive Devices54
Introduction55
Ordering Information55
- Factory Service55
- Schematic Diagrams and Component Location Drawings55
Replaceable Parts55

Keithley 197 - Page 2

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