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Keithley 236 Service Manual
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SECTION
1.
Performance
Verification
Table
17.
Low
Current
Measure
Verification
(inA
to
lOmA)
236/237
263
Compliance
Limit
Allowable
Readings**
Range
263
Output
&
Measure
Range*
(18°C
to
28°C)
2nA
Standby
inA
—O.OOO1OnA
to
+O.000lOnA
2riA
Standby
lOnA
OOOO1OnA
to
+OO.00lOnA
2nA
Standby
lOOnA
OOO.OO6nA
to
+000.006nA
2nA
Standby
ljiA
O.OOOO6jiA
to
+OOOOO6jiA
2nA
Standby
lOiiA
OO.OOO7jiA
to
+OOOOO7jiA
2nA
Standby
OOjiA
—OOO.OO6tA
to
+OOO.OO6iA
2nA
Standby
imA
-OOOOO6mA
to
+OOOOO6mA
2nA
Standby
lOmA
OOOOO6mA
to
+Oft0006mA
2nA
+O.90000nA
inA
O.8972OnA
to
+O.9O28OnA
2nA
—O.90000nA
inA
+O.8972OnA
to
—O9O28OnA
2OnA
+9OOOOnA
lOnA
—&972OnA
to
9.O28OnA
2OnA
—9.0000nA
lOnA
+&972OnA
to
+9O28OnA
200nA
+9OOOOnA
lOOnA
-898O5nA
to
—90.195nA
200nA
9O.OOOnA
lOOnA
+89.8O5nA
to
+90.195nA
2iiA
+ft9OOOOiA
1iA
-
to
2jiA
-O.9OOOOiA
liiA
+
to
+___________
2OiA
+9.0000jiA
lOjiA
—
to
2OjiA
9.OOOOjiA
lOjiA
+
to
+___________
200jiA
+9OOOOjiA
lOOjiA
-
to
200jaA
9O.OOOiA
lOOjiA
+
to
+____________
2mA
+O9OOOOmA
imA
to
—____________
2mA
-ft90000mA
imA
+
to
+___________
2OmA
+9.0000mA
OmA
—
to
—____________
2OmA
—9.0000mA
lOmA
+
to
+____________
*236/237
set
to
source
0V
on
the
1,1V
source
range.
**Allowable
readings
for
the
lj.tA
thru
lOmA
ranges
are
calculated
in
Table
1-6.
144
39
41
Table of Contents
Table of Contents
21
Performance Verification
27
Introduction
27
Environmental Conditions
27
Initial Cond1Tions
27
Required Test Equtpment
28
Verifications Procedures
28
Equipment Characterization
30
Table 1-3 Model 263 I-Source Characteristics
31
Common Mode Verification
32
Figure 1-2 Setup for Common Mode Verification
33
Voltage Source Verification
34
Figure 1-3 Setup for Voltage Source Ranges Verification
35
Voltage Measure Verification
35
Figure 1-4. Setupfor Voltagemeasure Ranges Verification
36
Table 1-5 Voltage Measure Verification
37
Remote Sense Verification
37
Figure 1-5 Setup for Remote Sense Verification
38
Low Current (Ina to Loma) Measure Ranges Verification
38
Low Current (Ina to Loma) Source Ranges Verification
43
Looma Measure Range Verification
44
Figure 1-8 Setup for Looma Measure Range Verification
45
Looma Source Range Verification
46
Calibration
49
Introduction
49
Recommended Calibration Equipment
49
Environmental Conditions
50
Warmup Period
50
Cal Lock
50
Calibration Procedures
50
Equipment Characterization
51
Figure 2-2 Setup for Equipment Characterization
52
Table 2-3 Model 263 I-Source Characterization
53
Voltage Calibration
54
Figure 2-3 Setup for Volts Calibration
55
Looma Range Calibration
57
Low Current Ranges Calibration (Ina Loma)
59
Calibration Errors
61
Table 2-4 Calibration Error Messages
62
Calibration Program
64
Table 3-1 Line Fuse Selection
73
Introduction
73
Line Fuse Replacement
73
Fan Filter Cleaning
73
Handling and Cleaning Precautions
76
Disassembly Instructions
76
Figure 3-3 Resonant Converter Board (Model 237)
77
Figure 3-4 Output Board
78
Figure 3-5 Analog Board (Shields Removed)
79
Diagnostics
82
Table 3-2 Recommended Troubleshooting Equipment
82
Special Handling of Static Sensitive Devices
82
Recommended Test Equipment
82
Power Supply Checks
84
Table 3-3 Power Supply Checks
84
Analog Switching
85
Table 3-4 Analog Switching; Current Ranging
85
Table 3-5 Analog Switching; Volts Ranging
86
Table 3-6 Analog Switching; Feedback
86
Digital and Display Checks
87
Table 3-9 Digital Circuitry Checks
88
Table 3-10 Display Circuitry Checks
89
Principles of Operation
90
Introduction
90
Analog Circuitry
91
V/I Control and Readback
91
Output Stage
93
Figure 4-3 Model 236 Output Stage (Simplified Schematic Diagram)
94
Feedback
95
Figure 4-6 Damping Relay Contact Bounce
96
Resonant Converter (Model 237)
97
A/D Converter
97
Table 4-1 Volts Range Relays
97
Digital Circuttry
98
I/O Controller
98
Source/Measure Controller
99
Communications
99
A Display Circuitry
99
Powersupply
100
Introduction
102
Parts Lists
102
Ordering Information
102
Schematic Diagrams and Component Location Drawings
102
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Keithley 236 Specifications
General
Brand
Keithley
Model
236
Category
Measuring Instruments
Language
English
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