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2182
Keithley 2182 Service Manual
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4-8
Troubleshootin
g
Figure 4-3
Simplified schematic of analog circuitry
PROTECTION
CH2_HI
CH 2
Q671
+
-
BOOTSTRAP AMP
U638
ACAL U643
7V_REF
1V_REF
0.1V_REF
LO
Q663
P
A
TH A
Q61
1, 612
Q613, 614
P
A
TH B
+V
-V
Q624
FLIP_UPPER_B
U61
1
FLIP_UPPER_A
Q622(P
A
TH A)
Q623(P
A
TH B)
PROTECTION
Q627, 630
+
-
U614
TP651
X1
X5
X100
U645
R648
R600
R
6
4
1
R
7
1
7
CH1 HI
CH1
Q666, 667
PROTECTION
Q664(1V
-10mV)
Q665(10V)
20K
Q672
9.9M
100K
Q673, 674
CH1
CH1 LO
+
-
+
-
U601
PBS
NBS
PBB_SLO
NBS_SLO
U600
BUFFER
LN_COM
CH2_LO
R693
PROTECTION
ON FRONT P
ANEL
TEMP SENSOR
Q670
Q638
APPROX 0.23V
MUL
TIPLEXER
LN_COM
DIV_COM
7V_REF
1V_REF
0.1V_REF
LO
U626
+
-
U630
X1
X10
X100
U
6
3
2
R664
R665
R666
GAIN AMP
TP652
TO A/D CONVER
TER
LOW NOISE PREAMPLIFIER
Q661, Q662
Q633, Q634
VR61
1, VR612
54
56
Table of Contents
Default Chapter
5
Safety Precautions
5
Table of Contents
7
List of Illustrations
11
List of Tables
12
1 Performance Verification
14
Introduction
15
Verification Test Requirements
15
Environmental Conditions
15
Warm-Up Period
16
Line Power
16
Recommended Test Equipment
16
Verification Reading Limits
17
Restoring Factory Defaults
17
Auto-Calibration (ACAL)
17
Performing the Verification Test Procedures
18
Test Summary
18
Test Considerations
18
Verification Procedures
19
Voltage Measurement Accuracy
19
Temperature Measurement Accuracy
21
Analog Output Accuracy
23
2 Calibration
26
Introduction
27
Environmental Conditions
27
Temperature and Relative Humidity
27
Calibration Considerations
28
Calibration Cycle
28
Calibration Menu
28
Table 2-1 Calibrating Menu
28
Calibration Errors
30
Aborting Calibration
31
Normal Calibration
31
Recommended Calibration Equipment
31
Front Panel Calibration
31
Remote Calibration
35
Factory Calibration
37
Recommended Test Equipment
37
Remote Factory Calibration
38
Figure 2-3 Connections for Factory DC Volts Calibration
39
Table 2-7 Remote Precalibration Steps
39
Figure 2-4 Low Thermal Short Connections for Factory Calibration
40
Table 2-5 DC Voltage Remote Calibration Programming Steps
40
3 Routine Maintenance
44
Introduction
45
Line Fuse Replacement
45
Figure 3-1 Line Fuse Replacement
45
Line Voltage Selection
46
4 Troubleshooting
48
Introduction
49
Repair Considerations
49
Power-On Self-Test
50
Front Panel Tests
50
KEY Test
50
DISP Test
50
Principles of Operation
51
Power Supply
51
Figure 4-1 Power Supply Block Diagram
51
Figure 4-2 Digital Circuitry Block Diagram
51
Figure 4-3 Simplified Schematic of Analog Circuitry
51
Display Board
52
Digital Circuitry
53
Analog Circuitry
54
Troubleshooting
57
Display Board Checks
57
Table 4-1 Circuit Gain Factors
57
Table 4-2 Display Board Checks
57
Power Supply Checks
58
Table 4-3 Power Supply Checks
58
Digital Circuit Checks
59
Table 4-4 Digital Circuit Checks
59
Analog Circuit Checks
60
Table 4-5 Analog Circuit Checks
60
Analog Signal Switching States
61
Table 4-6 Signal Multiplexing Gain Switching
61
Table 4-7 Input Protection and Low-Noise Preamplifier Analog Switching States
62
No Comm Link Error
63
5 Disassembly
64
Introduction
65
Handling and Cleaning
65
Handling PC Boards
65
Solder Repairs
65
Static Sensitive Devices
66
Assembly Drawings
66
Disassembly
67
Case Cover Removal
67
Motherboard Removal
68
Front Panel Disassembly
68
Main CPU Firmware Replacement
69
Changing Trigger Link Lines
70
Table 5-1 Trigger Link Connections
70
Removing Power Components
71
Power Transformer Removal
71
Power Module Removal
71
Instrument Reassembly
72
Power Module Connections
72
Board Installation
72
6 Replaceable Parts
79
Introduction
80
Parts Lists
80
Ordering Information
80
Factory Service
80
Component Layouts
80
Specifications
92
Noise Performance
93
Analog Output
95
Remote Interface
95
Calibration Reference
96
Introduction
97
Command Summary
98
Default Calibration Constants and Tolerances
99
Miscellaneous Commands
101
Code
101
Count
101
Lock
102
Save
102
Date
103
Ndue
103
Data
104
Calibration Step Commands
104
Precalibration Commands
105
Pcal
105
Detecting Calibration Errors
106
Reading the Error Queue
106
Error Summary
106
Status Byte EAV (Error Available) Bit
107
Generating an SRQ on Error
107
Detecting Calibration Step Completion
108
Using the *OPC Command
108
Calibration Program
110
Introduction
111
Computer Hardware Requirements
111
Software Requirements
111
Calibration Equipment
111
General Program Instructions
112
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Keithley 2182 Specifications
General
Brand
Keithley
Model
2182
Category
Measuring Instruments
Language
English
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