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2500
Keithley 2500 Service Manual
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Model 2500 Service Manual
Calibration
2-15
T
able 2-5
Current calibration values
Current range
Calibration currents
2nA
+1.90000nA
0.0000nA
-1.90000nA
20nA
+19.0000nA
0.0000nA
-19.0000nA
200nA
+190.000nA
0.000nA
-190.000nA
2
µ
A
+1.90000
µ
A
0.00000
µ
A
-1.90000
µ
A
20
µ
A
+19.0000
µ
A
0.0000
µ
A
-19.0000
µ
A
2
00µ
A
+190.000
µ
A
0.000
µ
A
-190.000
µ
A
2mA
+1.90000mA
0.00000mA
-1.90000mA
20mA
+19.0000mA
0.0000mA
-19.0000mA
41
43
Table of Contents
Table of Contents
8
Performance Verification
16
Introduction
17
Verification Test Requirements
17
Environmental Conditions
17
Warm-Up Period
18
Line Power
18
Recommended Test Equipment
19
Verification Limits
19
Example Limits Calculation
20
Restoring Factory Defaults
20
Performing the Verification Test Procedures
21
Test Summary
21
Test Considerations
21
Current Measurement Accuracy
21
Voltage Bias Accuracy
25
Calibration
28
Introduction
29
Environmental Conditions
29
Temperature and Relative Humidity
29
Warm-Up Period
29
Line Power
29
Calibration Considerations
30
Calibration Cycle
30
Recommended Calibration Equipment
30
Calibration Menu
31
Unlocking Calibration
32
Unlocking Calibration from the Front Panel
32
Unlocking Calibration by Remote
33
Changing the Password
33
Changing the Password from the Front Panel
33
Changing the Password by Remote
33
Resetting the Calibration Password
34
Viewing Calibration Dates and Calibration Count
34
Calibration Errors
35
Front Panel Error Reporting
35
Remote Error Reporting
35
Aborting Calibration Steps
35
Front Panel Calibration
35
Remote Calibration
46
Remote Calibration Command Summary
46
Remote Calibration Procedure
47
Routine Maintenance
56
Line Voltage Selection
57
Line Fuse Replacement
57
Troubleshooting
60
Introduction
61
Safety Considerations
61
Repair Considerations
61
Power-On Self Test
62
Front Panel Tests
62
KEYS Test
62
DISPLAY PATTERNS Test
62
CHAR SET Test
63
Principles of Operation
63
Overall Block Diagram
64
Analog Circuits
65
Power Supply
67
Digital Circuitry
68
Troubleshooting
69
Display Board Checks
69
Power Supply Checks
70
Digital Circuitry Checks
71
Analog Circuitry Checks
72
No Comm Link Error
73
Disassembly
74
Introduction
75
Handling and Cleaning
75
Handling PC Boards
75
Solder Repairs
75
Static Sensitive Devices
76
Assembly Drawings
76
Case Cover Removal
77
Input Board Removal
77
Mother Board Removal
78
Front Panel Disassembly
79
Removing Power Components
79
Power Supply Module Removal
79
Power Module Removal
79
Power Transformer Removal
80
Replaceable Parts
82
Parts Lists
83
Ordering Information
83
Factory Service
83
Component Layouts
84
Accuracy Calculations
97
Measurement Accuracy
97
Voltage Bias Accuracy
97
Calibration Reference
98
Introduction
99
Command Summary
99
Miscellaneous Commands
100
Current Measurement Commands
103
Voltage Bias Commands
104
Detecting Calibration Errors
105
Reading the Error Queue
105
Error Summary
105
Status Byte EAV (Error Available) Bit
106
Generating an SRQ on Error
106
Detecting Calibration Step Completion
106
Using the *OPC? Query
106
Using the *OPC Command
107
Generating an SRQ on Calibration Complete
107
Calibration Program
108
Introduction
109
Computer Hardware Requirements
109
Software Requirements
109
Calibration Equipment
109
General Program Instructions
110
Program C-1 Model 2500 Calibration Program
111
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Keithley 2500 Specifications
General
Brand
Keithley
Model
2500
Category
Measuring Instruments
Language
English
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