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Keithley
Multimeter
2700
Keithley 2700 Service Manual
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Troubleshooting
4-15
T
able 4-10
DCA signal switching
Range
K103
20mA
100mA
1A
3A
Set
Reset
Reset
Reset
K103 set states:
Pin 8 to 7
Pin 3 to 4
K103 reset states:
Pin 8 to 9
Pin 3 to 2
T
able 4-11
ACA signal switching
Range
K103
U105
pin 16
U105
pin 1
U111
pin 16
U105
pin 8
U103
pin 16
U103
pin 1
1A
3A
Reset
Reset
ON
ON
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
K103 set states:
Pin 8 to 7
Pin 3 to 4
K103 reset states:
Pin 8 to 9
Pin 3 to 2
94
96
Table of Contents
Default Chapter
3
Service Manual
3
Safety Precautions
5
Table of Contents
7
1 Performance Verification
17
Introduction
18
Verification Test Requirements
19
Environmental Conditions
19
Warm-Up Period
19
Line Power
19
Recommended Test Equipment
20
Table 1-1 Recommended Verification Equipment
20
Verification Limits
21
Example Reading Limit Calculation
21
Calculating Resistance Reading Limits
21
Restoring Factory Defaults
21
Performing the Verification Test Procedures
22
Verification Test Summary
22
Test Considerations
23
Model 2700 Verification
24
Verifying DC Voltage
24
Figure 1-1 Connections for Model 2700 DC Volts Verification
24
Verifying AC Voltage
25
Figure 1-2 Connections for Model 2700 AC Volts Verification
25
Table 1-2 DCV Reading Limits
25
Table 1-3 ACV Reading Limits
26
Verifying DC Current
27
Figure 1-3 Connections for Model 2700 DC Current Verification
27
Table 1-4 DCI Limits
27
Verifying AC Current
28
Figure 1-4 Connections for Model 2700 AC Current Verification
28
Table 1-5 ACI Limits
28
Verifying Resistance
29
Figure 1-5 Connections for Model 2700 Resistance Verification (100Ω to 10MΩ Ranges)
29
Figure 1-6 Connections for Model 2700 Resistance Verification (100MΩ Range)
30
Table 1-6 Limits for Resistance Verification
30
Verifying Temperature
31
Verifying Frequency
33
Figure 1-7 Connections for Model 2700 Frequency Verification
33
Model 7700 Verification
34
Verifying DC Voltage
34
Figure 1-8 Connections for Model 7700 DC Volts Verification
34
Table 1-9 Plug-In Module DCV Reading Limits
35
Figure 1-9 Connections for Model 7700 AC Volts Verification
36
Verifying AC Voltage
36
Table 1-10 Plug-In Module ACV Reading Limits
37
Figure 1-10 Connections for Model 7700 DC Current Verification
38
Verifying DC Current
38
Table 1-11 Plug-In Module DCI Limits
39
Verifying AC Current
40
Figure 1-11 Connections for Model 7700 AC Current Verification
40
Table 1-12 Plug-In Module ACI Limits
40
Verifying Resistance
41
Figure 1-12 Connections for Model 7700 Resistance Verification (100Ω to 10MΩ Ranges)
41
Figure 1-13 Connections for Model 7700 Resistance Verification (100MΩ Range)
42
Verifying Temperature
43
Table 1-13 Limits for Plug-In Module Resistance Verification
43
Figure 1-14 Connections for Model 7700 Thermocouple Temperature Verification
44
Verifying Frequency
46
Verifying Ratio and Average
46
Figure 1-15 Connections for Model 7700 Frequency Verification
46
Figure 1-16 Connections for Model 7700 Ratio and Average Verification
47
2 Calibration
49
Introduction
50
Environmental Conditions
50
Warm-Up Period
50
Line Power
50
Calibration Considerations
51
Calibration Code
52
Front Panel Calibration Code
52
Remote Calibration Code
52
Comprehensive Calibration
53
Calibration Cycle
53
Recommended Equipment
53
Table 2-1 Recommended Equipment for Comprehensive Calibration
53
Aborting Calibration
54
Front Panel Calibration
54
Figure 2-1 Low-Thermal Short Connections
55
Table 2-2 Comprehensive Calibration Procedures
55
Figure 2-2 Connections for DC Volts and Ohms Calibration
56
Table 2-3 DC Volts Calibration Summary
57
Table 2-4 Ohms Calibration Summary
57
Figure 2-3 Connections for DC and AC Amps Calibration
58
Table 2-5 DC Current Calibration Summary
58
Figure 2-4 Connections for AC Volts Calibration
59
Table 2-6 AC Voltage Calibration Summary
59
Table 2-7 AC Current Calibration Summary
60
Remote Calibration
61
Table 2-8 DC Voltage Calibration Programming Steps
63
Table 2-9 Resistance Calibration Programming Steps
63
Table 2-10 DC Current Calibration Programming Steps
64
Table 2-11 AC Voltage Calibration Programming Steps
65
Table 2-12 AC Current Calibration Programming Steps
65
Manufacturing Calibration
66
Recommended Test Equipment
66
Table 2-13 Recommended Equipment for Manufacturing Calibration
66
Extender Board Preparation
67
Unlocking Manufacturing Calibration
67
Measuring Function Generator Signal Amplitude
67
Front Panel Manufacturing Calibration
68
Figure 2-5 Function Generator Connections for Manufacturing Calibration
68
Remote Manufacturing Calibration
69
Model 7700 Calibration
70
Recommended Test Equipment
70
Extender Board Connections
70
Table 2-14 Recommended Equipment for Model 7700 Calibration
70
Front Panel Model 7700 Calibration
70
3 Routine Maintenance
73
Introduction
74
Setting the Line Voltage and Replacing the Line Fuse
74
Figure 3-1 Power Module
75
Table 3-1 Power Line Fuse
75
Replacing the Front Terminal AMPS Fuse
76
Replacing Plug-In Module Amps Fuses
77
Replacing Model 7700 Amps Fuses
77
Replacing Model 7702 Amps Fuses
78
Figure 3-4 Model 7702 Amps Fuses
79
Replacing Non-Volatile RAM Battery
80
4 Troubleshooting
81
Introduction
82
Repair Considerations
82
Power-On Self-Test
82
Front Panel Tests
83
KEY Test
83
DISP Test
83
Principles of Operation
84
Power Supply
84
Figure 4-1 Power Supply Block Diagram
84
Table 4-1 Power Supply Components
85
Display Board
86
Figure 4-2 Digital Circuitry Block Diagram
86
Digital Circuitry
87
Analog Circuitry
88
Rs-232 Interface
88
Trigger Circuits
88
Analog Circuitry Block Diagram
89
Troubleshooting
91
Display Board Checks
91
Power Supply Checks
91
Digital Circuitry Checks
92
Analog Signal Switching States
93
Table 4-5 DCV Signal Switching
93
Table 4-6 ACV and FREQ Signal Switching
93
Table 4-7 Ω2 Signal Switching
94
Table 4-8 Ω4 Signal Switching
94
Table 4-9 Ω2/Ω4 Reference Switching
94
Table 4-10 DCA Signal Switching
95
Table 4-11 ACA Signal Switching
95
Table 4-12 DCV Signal Multiplexing and Gain
96
Table 4-13 ACV and ACA Signal Multiplexing and Gain
96
Table 4-14 DCA Signal Multiplexing and Gain
96
Table 4-15 Ω2 Signal Multiplexing and Gain
97
Table 4-16 Ω4 Signal Multiplexing and Gain
97
Table 4-17 Switching Device Locations
97
No Comm Link Error
98
5 Disassembly
99
Introduction
100
Handling and Cleaning
100
Handling PC Boards
100
Solder Repairs
100
Static Sensitive Devices
101
Assembly Drawings
101
Disassembly Procedures
102
Case Cover Removal
102
Motherboard Removal
102
Card Cage Removal
103
Front Panel Disassembly
104
Removing Power Components
104
Instrument Reassembly
105
Input Terminal Wire Connections
105
Power Module Wire Connections
105
Table 5-1 Input Terminal Wire Colors
105
Table 5-2 Power Module Wire Colors
105
6 Replaceable Parts
107
Parts Lists
108
Ordering Information
108
Factory Service
108
Component Layouts
108
Table 6-1 Model 2700 Motherboard Parts List
109
Table 6-2 Model 2700 Display Board Parts List
114
Table 6-3 Model 2700 Connector Board Parts List
115
Table 6-4 Model 2700 Miscellaneous Parts List
116
Table 6-5 Model 7700 Parts List
117
Table 6-6 Model 7702 Parts List
118
Table 6-7 Model 7703 Parts List
119
Table 6-8 Model 7705 Parts List
120
DC Volts
124
DC Current
124
Ac Current
125
General Specifications
127
Specifications
132
Accuracy Calculations
132
Calculating DC Characteristics Accuracy
132
Calculating AC Characteristics Accuracy
132
Calculating Dbm Characteristics Accuracy
133
Calculating Db Characteristics Accuracy
133
Additional Derating Factors
134
Optimizing Measurement Accuracy
134
DC Voltage, DC Current, and Resistance
134
AC Voltage and AC Current
134
Temperature
134
Optimizing Measurement Speed
135
DC Voltage, DC Current, and Resistance
135
AC Voltage and AC Current
135
Temperature
135
Calibration Reference
137
Introduction
138
Command Summary
138
Miscellaneous Calibration Commands
140
Code
140
Count
140
Init
141
Lock
141
Lock?
142
Save
142
Date
143
Ndue
143
DC Calibration Commands
144
Step1
144
Step2
145
Step3
145
Step4
145
Step5
146
Step6
146
Step7
146
Step8
147
Step9
147
Step10
147
Step11
148
Step12
148
AC Calibration Commands
149
Ac:step<N
150
Manufacturing Calibration Commands
151
Ac:step<14|15
151
DC:step0
151
Model 7700 Calibration Commands
152
Code
153
Count
153
Date
154
Init
154
Lock
155
Rcount
155
Save
156
Step0
156
Remote Error Reporting
157
Calibration Error Summary
157
Error Summary
157
Error Queue
159
Generating an SRQ on Error
159
Status Byte EAV (Error Available) Bit
159
Detecting Calibration Step Completion
159
Using the *OPC? Query
159
Using the *OPC Command
160
Generating an SRQ on Calibration Complete
160
Calibration Program
161
Introduction
162
Computer Hardware Requirements
162
Software Requirements
162
Calibration Equipment
162
General Program Instructions
163
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Keithley 2700 Specifications
General
Brand
Keithley
Model
2700
Category
Multimeter
Language
English
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