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Keithley 237 Instruction Manual
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Operation
4-9
Figure 4-6
V
oltage divider checks
Model 196
HI
LO
Output
Common
Model 230
Measure V
Source V
H
1
2
Model 7012
3
V
196
230
+/-
Equivalent Circuit
4
L
Sense Output
Sense Common
R
1
R
2
R
3
Thick Film
HL
HL
HL
HL
H
L
H
L
H
L
R
1
R
2
R
3
H
H
H
H
12
3
4
Rows
HL
5
R
4
X
X
X
X
X = Closed Crosspoints
Cols
R
4
H
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54
56
Table of Contents
Table of Contents
10
Introduction
15
Features
15
Warranty Information
16
Manual Addenda
16
Safety Symbols and Terms
16
Specifications
16
Unpacking and Inspection
16
Inspection for Damage
16
Shipping Contents
16
Instruction Manual
17
Repacking for Shipment
17
Optional Accessories
17
Figure
18
Model 7012 Simplified Schematic
18
Figure
19
Model 7001 Analog Backplane
19
Introduction
18
Basic Matrix Configuration (4 × 10)
18
Figure
20
Single-Ended Switching Example
20
Matrix Row Connections to Backplane
20
Typical Matrix Switching Schemes
20
Single-Ended Switching
20
Differential Switching Example
21
Figure
21
Figure 2-6 Sensing Example
21
Differential Switching
21
Sensing
21
Figure 2-7 SMU Connections
22
SMU Connections
22
Matrix Expansion
22
Two-Card Switching Systems
22
Two Separate 4 × 10 Matrices
23
Figure
23
Figure
24
Narrow Matrix Example (4 × 20)
24
Figure 2-10 Wide Matrix Example (8 × 10)
25
Figure 2-11 Mixed Card Type Example
26
Mainframe Matrix Expansion
26
Introduction
28
Handling Precautions
28
Connections
28
Figure
29
Figure 3-1 Backplane Row Jumpers
29
Figure
30
Typical Terminal Block Connections
30
Backplane Row Jumpers
29
Screw Terminal Connector Card
29
Multi-Pin (Mass Termination) Connector Card
31
Cable Clamp for Screw Terminal Connector Card
31
Figure
31
Multi-Pin Connector Card Terminal Identification
32
Figure
32
Typical Round Cable Connection Techniques
34
Figure
34
Model 7011-MTR Connector Pinout
35
Figure
35
Model 7011-KIT-R (with Cable) Assembly
35
Typical Connection Schemes
36
Single Card System
36
Two-Card System
36
Single Card System Example (Multi-Pin Connector Card)
37
Two-Mainframe System
41
Model 7012 Installation and Removal
41
Figure
42
Introduction
47
Power Limits
47
Mainframe Control of Matrix Card
47
Channel Assignments
48
Channel Status Display
48
Figure
48
Display Organization for Multiplexer Channels
49
Figure
49
Model 7012 Programming Channel Assignments
49
Front Panel Control
50
IEEE-488 Bus Operation
50
Matrix Switching Examples
51
Thick Film Resistor Network Testing
51
Figure
52
Four-Terminal Ohms Measurements
52
Figure
53
Voltage Divider Checks
54
Transistor Testing
56
Figure 4-7 Transistor Testing
56
Figure 4-8 DC Parameter Checks
58
Measurement Considerations
59
Path Isolation
59
Magnetic Fields
60
Radio Frequency Interference
60
Ground Loops
60
Keeping Connectors Clean
61
AC Frequency Response
61
Introduction
63
Handling and Cleaning Precautions
63
Performance Verification
64
Environmental Conditions
64
Recommended Equipment
64
Verification Equipment
64
Matrix Card Connections
65
Channel Resistance Tests
65
Offset Current Tests
66
Contact Potential Tests
68
Path Isolation Tests
69
Differential and Common-Mode Isolation Tests
71
Special Handling of Static-Sensitive Devices
73
Differential and Common-Mode Isolation Testing
73
Principles of Operation
74
Block Diagram
74
ID Data Circuits
75
Relay Control
75
Relay Power Control
76
Power-On Safeguard
76
Troubleshooting
77
Troubleshooting Equipment
77
Troubleshooting Access
77
Troubleshooting Procedure
77
Recommended Troubleshooting Equipment
77
Table
77
Introduction
79
Parts Lists
79
Ordering Information
79
Factory Service
79
Component Layouts and Schematic Diagrams
80
Other manuals for Keithley 237
Service Manual
138 pages
Applications Manual
201 pages
4
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Keithley 237 Specifications
General
Brand
Keithley
Model
237
Category
Measuring Instruments
Language
English
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