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Keithley
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2701
Keithley 2701 Service Manual
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Model 2701 Service Manual
Troubleshooting
4-11
Figure 4-3
Analog cir
cuitry bloc
k diagr
am
Scanner
Inputs
BUFCOM
Slot 1
INPUT
HI
SENSE
LO
Scanner Outputs
DCV
OHMS
DCV/100
Current
Shunts
K103, R158,
R205, R338
AC Switching
&
Gain
K102, U102, U103, U105,
U1
12, U1
18, U1
1
1, U1
10
SSP*
Q101, Q102
DCV
Divider
R1
17, Q109,
Q1
14, Q136
Ohms I-Source
Q1
19, Q123,
Q124, Q125, Q126,
U123, U133
DCV & Ohms
Switching
Q104, Q105
Q108, Q1
13
X1
Buffer
U1
13
Digital
Circuitry
(See
Figure 4-2)
ADC
U165
A/D
MUX &
Gain
U129, U132
U163, U166
SENSE
HI
ACV
,
FREQ
AMPS
DCA
ACA
Slot
Control
* Solid State Protection
X1
Buffer
U167
Front T
erminals
Scanner Outputs
K101
Q120, CR1
14
Protection
R132, R139, R148,
R163, Q122, Q135,
VR1
19, VR120
Protection
R120, R121, R124,
R125, Q107, Q148,
VR1
19, VR120
Front T
erminals
Scanner Outputs
Front T
erminals
Scanner Outputs
Front T
erminals
Scanner Outputs
Scanner
Inputs
Slot 2
S101
S101
S101
S101
87
89
Table of Contents
Default Chapter
3
Service Manual
3
Table of Contents
7
1 Performance Verification
15
Introduction
16
Verification Test Requirements
17
Environmental Conditions
17
Warm-Up Period
17
Line Power
17
Recommended Test Equipment
18
Table 1-1 Recommended Verification Equipment
18
Verification Limits
19
Example Reading Limit Calculation
19
Calculating Resistance Reading Limits
19
Restoring Factory Defaults
19
Performing the Verification Test Procedures
20
Verification Test Summary
20
Test Considerations
21
Model 2701 Verification
22
Verifying DC Voltage
22
Figure 1-1 Connections for Model 2701 DC Volts Verification
22
Table 1-2 DCV Reading Limits
23
Verifying AC Voltage
24
Figure 1-2 Connections for Model 2701 AC Volts Verification
24
Table 1-3 ACV Reading Limits
25
Verifying DC Current
26
Figure 1-3 Connections for Model 2701 DC Current Verification
26
Table 1-4 DCI Limits
26
Verifying AC Current
27
Figure 1-4 Connections for Model 2701 AC Current Verification
27
Table 1-5 ACI Limits
27
Verifying Resistance
28
Table 1-6 Limits for Resistance Verification
29
Verifying Temperature
30
Verifying Frequency
32
Model 7700 Verification
32
Verifying DC Voltage
32
Figure 1-7 Connections for Model 2701 Frequency Verification
32
Figure 1-8 Connections for Model 7700 DC Volts Verification
33
Table 1-9 Plug-In Module DCV Reading Limits
33
Verifying AC Voltage
34
Performance Verification
34
Figure 1-9 Connections for Model 7700 AC Volts Verification
34
Table 1-10 Plug-In Module ACV Reading Limits
35
Verifying DC Current
36
Figure 1-10 Connections for Model 7700 DC Current Verification
36
Table 1-11 Plug-In Module DCI Limits
37
Figure 1-11 Connections for Model 7700 AC Current Verification
38
Verifying AC Current
38
Table 1-12 Plug-In Module ACI Limits
38
Verifying Resistance
39
Table 1-13 Limits for Plug-In Module Resistance Verification
40
Verifying Temperature
42
Table 1-14 Model 7700 Thermocouple Temperature Verification Reading Limits
43
Figure 1-14 Connections for Model 7700 Thermocouple Temperature Verification
43
Verifying Frequency
45
Figure 1-15 Connections for Model 7700 Frequency Verification
45
Verifying Ratio and Average
46
Figure 1-16 Connections for Model 7700 Ratio and Average Verification
46
2 Calibration
47
Introduction
48
Environmental Conditions
48
Warm-Up Period
48
Line Power
48
Calibration Considerations
49
Calibration Code
50
Front Panel Calibration Code
50
Remote Calibration Code
50
Comprehensive Calibration
51
Calibration Cycle
51
Recommended Equipment
51
Table 2-1 Recommended Equipment for Comprehensive Calibration
51
Aborting Calibration
52
Front Panel Calibration
52
Figure 2-1 Low Thermal Short Connections
53
Table 2-2 Comprehensive Calibration Procedures
53
Figure 2-2 Connections for DC Volts and Ohms Calibration
54
Table 2-3 DC Volts Calibration Summary
55
Table 2-4 Ohms Calibration Summary
55
Figure 2-3 Connections for DC and AC Amps Calibration
56
Table 2-5 DC Current Calibration Summary
56
Figure 2-4 Connections for AC Volts Calibration
57
Table 2-6 AC Voltage Calibration Summary
57
Table 2-7 AC Current Calibration Summary
58
Remote Calibration
59
Table 2-8 DC Voltage Calibration Programming Steps
61
Table 2-9 Resistance Calibration Programming Steps
61
Table 2-10 DC Current Calibration Programming Steps
62
Table 2-11 AC Voltage Calibration Programming Steps
63
Table 2-12 AC Current Calibration Programming Steps
64
Programming Calibration Dates
64
Saving Calibration Constants
64
Manufacturing Calibration
65
Recommended Test Equipment
65
Calibration Card Preparation
65
Unlocking Manufacturing Calibration
65
Table 2-13 Recommended Equipment for Manufacturing Calibration
65
Measuring Function Generator Signal Amplitude
66
Front Panel Manufacturing Calibration
66
Figure 2-5 Function Generator Connections for Manufacturing Calibration
66
Remote Manufacturing Calibration
67
Model 7700 Calibration
68
Recommended Test Equipment
68
Calibration Card Connections
68
Table 2-14 Recommended Equipment for Model 7700 Calibration
68
3 Routine Maintenance
70
Introduction
71
Setting the Line Voltage and Replacing the Line Fuse
71
Figure 3-1 Power Module
72
Table 3-1 Power Line Fuse
72
Replacing the Front Terminal AMPS Fuse
73
Replacing Model 7700 Plug-In Module Amps Fuses
74
Replacing Non-Volatile RAM Battery
75
Plug-In Module Relay Closure Count
76
Closure Count Commands
76
Reading Relay Closure Count
76
Resetting Relay Closure Count
77
Setting Count Update Interval
77
4 Troubleshooting
78
Introduction
79
Repair Considerations
79
Power-On Self-Tests
80
RAM and EPROM Tests
80
Flash Memory Tests
80
Table 4-1 Flash Memory Failure Modes
80
Front Panel Tests
81
KEY Test
81
DISP Test
81
Principles of Operation
82
Power Supply
82
Figure 4-1 Power Supply Block Diagram
82
Display Board
83
Table 4-2 Power Supply Components
83
Figure 4-2 Digital Circuitry Block Diagram
84
Digital Circuitry
85
Rs-232 Interface
86
Module Slot Control
86
Analog Circuitry
87
Figure 4-3 Analog Circuitry Block Diagram
88
Figure 4-4 Ohms Open-Lead Sense Detection Block Diagram
89
Scanner Card Signals
89
Troubleshooting
90
Display Board Checks
90
Power Supply Checks
90
Table 4-4 Power Supply Checks
90
Digital Circuitry Checks
91
Analog Signal Switching States
91
Table 4-5 Digital Circuitry Checks
91
Table 4-8
92
Table 4-10
93
Table 4-12 ACA Signal Switching
94
Table 4-13 DCV Signal Multiplexing and Gain
94
Table 4-14 ACV and ACA Signal Multiplexing and Gain
94
Table 4-16 Ω2 Signal Multiplexing and Gain
95
Table 4-17 Ω4 Signal Multiplexing and Gain
95
Table 4-15 DCA Signal Multiplexing and Gain
95
Table 4-18 Switching Device Locations
96
5 Disassembly
97
Introduction
98
Handling and Cleaning
98
Handling PC Boards
98
Solder Repairs
98
Static Sensitive Devices
99
Assembly Drawings
99
Disassembly Procedures
100
Case Cover Removal
100
Motherboard Removal
100
Card Cage Removal
101
Front Panel Disassembly
101
Removing Power Components
102
Power Transformer Removal
102
Power Module Removal
102
Instrument Reassembly
103
Input Terminal Wire Connections
103
Power Module Wire Connections
103
Table 5-1 Input Terminal Wire Colors
103
Table 5-2 Power Module Wire Colors
103
6 Replaceable Parts
111
Introduction
112
Parts Lists
112
Ordering Information
112
Factory Service
112
Component Layouts
112
Table 4-6 Table
113
Table 6-1 Model 2701 Motherboard Parts List
113
Table 4-16 Table
121
Table 4-7 Table
121
Table 6-2 Model 2701 Display Board Parts List
121
Table 6-3 Model 2701 Backplane Board Parts List
121
Table 6-4 Model 2701 Miscellaneous Parts List
122
Table 6-5 Model 7700 Parts List
123
Specifications
131
DC Volts
133
DC Current
133
Ac Current
134
Accuracy Calculations
136
Calculating DC Characteristics Accuracy
136
Calculating AC Characteristics Accuracy
136
Calculating Dbm Characteristics Accuracy
137
Calculating Db Characteristics Accuracy
138
Additional Derating Factors
138
Optimizing Measurement Accuracy
139
DC Voltage, DC Current, and Resistance
139
AC Voltage and AC Current
139
Temperature
139
Optimizing Measurement Speed
139
Calibration Reference
140
Introduction
141
Command Summary
141
Miscellaneous Calibration Commands
143
Code
143
Count
143
Init
144
Lock
144
Lock
145
Save
145
Date
146
Ndue
146
Data
147
DC Calibration Commands
148
Step1
148
Step2
149
Step3
149
Step4
149
Step5
150
Step6
150
Step7
150
Step8
151
Step9
151
Step10
151
Step11
152
Step12
152
AC Calibration Commands
153
Ac:step<N
154
Manufacturing Calibration Commands
155
Ac:step<14|15
155
DC:step0
155
Model 7700 Calibration Commands
156
Code
157
Count
157
Date
158
Init
158
Lock
159
Rcount
159
Save
160
Step0
160
Remote Error Reporting
161
Error Summary
161
Error Queue
163
Status Byte EAV (Error Available) Bit
163
Detecting Calibration Step Completion
163
Other manuals for Keithley 2701
User Manual
506 pages
Instruction Manual
61 pages
4
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Keithley 2701 Specifications
General
Brand
Keithley
Model
2701
Category
Multimeter
Language
English
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