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197
Keithley 197 User Manual
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Instruction
Manual
Model
197
Autoranging
Microvolt
DMM
0
Keit
hley
Instruments,
Inc.
Cleveland,
Ohio,
U.S.A.
Document
Number
197-901-01
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
1
3
Table of Contents
Table of Contents
4
Introduction
10
Features
10
Safety Symbols and Terms
10
Section 1-General Information
10
Warranty Information
10
Manualaddenda
10
Initial Operation
11
Specifications
11
Unpacking and Inspection
11
Using the Model 197 Manual
11
Accessories
12
Section 2-Bench Operation
13
High Energy Circuit Safety Precautions
13
Introduction
13
Preparation for Use
13
Linepower
13
Batterypackpower
14
Battery Charging
14
Front Panel Familiarization
14
Display
14
Front Panel Controls
15
Input Terminals
15
Current Fuse Replace
15
Basic Bench Measurements
16
Powerup
17
Relative Mode
17
Errormessages
16
Operating Conditions
16
Environmental Conditions
16
Maximum Allowable Inputs
16
Warmup
16
Model 197 Maximum Allowable Inputs
17
Ent
18
TRMS AC Voltage Measurements
18
DC Voltage Measurements
18
Microvolt Measurement Considerations
19
TRMS AC Voltage Measurements
19
Resistance Measurements
20
Current Measurements (DC or TRMS AC)
21
Four Terminal Resistance Measurement
21
Four Terminal Zeroing
21
AC Plus DC Measurements
22
Db Measurements
22
Two Terminal Resistance Measurement
21
Current Measurements between 2
22
Current Measurements up to 2000Ma
22
Db Measurements Considerations and Applicatio
24
Levels for Other Reference Impedances
24
MIN/MAX and 100 Point Data Logger Operatio
25
Diode Test
25
TRMS Considerations
25
AC Voltage Offset
26
TRMS Measurement Comparison
26
Crestfactor
26
Extended Frequency Response
26
Comparison of Average and TRMS Meter Readings
28
Section 3- Performance Verification
29
Initial Conditions
29
Recommended Test Equipment
29
Verification Procedure
29
DC Voltage Accuracy Check
30
AC Voltage Accuracy Check
30
Connections for ACV Verification
30
Resistance Accuracy Check
31
Connections for DCV Verification
30
Limits for DC Voltage Verification
30
Limits for AC Voltage Verification
31
Limits for Resistance Verification
31
DC Current Accuracy Check
32
Limits for DC Current Verification
32
AC Current Accuracy Check
33
Connections for DC Current Verification (2000Ma to 20A)
33
Connections for DC Current Verification (200Pa to 2000Ma)
33
Limits for AC Current Verification
34
Section 4-Theory of Operation
35
Analog Circuitry
35
Multiplexer
35
Input Buffer Amplifier
35
Introduction
35
Overall Functional Description
35
JFET Multiplexer
37
Simplified Schematic of the Input Buffer Amplifier
37
Input Configuration During 2- and 4-Terminal Resistance Measurements
38
AC Converter
39
Resistance Measurement Simplified Circuit
39
Pia
40
Display Board
40
Digital Calibration
40
Model 1978 Battery Option
41
Section 5-Maintenance
42
Battery Pack (Model 1978) Installation
42
Introduction
42
Top Cover Removal/Installation
42
Fuse Replacement
43
Line Fuse Replacement
43
Current Fuse Replacement
43
Line Voltage Selection
43
Model 197 Miscellaneous Parts
44
Front Panel Calibration
45
Recommended Calibration Equipment
45
Environmental Conditions
45
DC Voltage Calibration
46
AC Voltage Calibration
46
Frequency Compensation
46
DC Voltage Calibration Configuration
46
AC Voltage Calibration Configuration
47
Resistance Calibration
48
Calibration Storage
48
Troubleshooting
49
Powerupsequence
49
Self Diagnostic Program
49
Power Supply and Battery Pack (Model 1978) Checks
50
A / D Converter and Display
50
Signal Conditioning
50
Segment Identification
50
Model 197 Troubleshooting Mode
52
Special Handling of Static Sensitive Devices
52
A / D Converter
54
Section 6-Replaceable Parts
55
Model 197 Static Sensitive Devices
54
Introduction
55
Ordering Information
55
Factory Service
55
Schematic Diagrams and Component Location Drawings
55
Replaceable Parts
55
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Keithley 197 Specifications
General
Brand
Keithley
Model
197
Category
Multimeter
Language
English
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