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237
Keithley 237 Service Manual
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SECTION
2
Calibration
3.
Over
the
1EEE488
bus,
send
the
following
command
to
enter
the
calibration
mode:
cox
!
Enter
calibration
mode
Note:
All
other
calibration
commands
(Cl
through
C59)
will
be
ignored
unless
the
CO
command
is
first
sent
over
the
bus.
4.
Send
the
following
command
over
the
1EEE488
bus:
C42X
!
Calibrate
offset;
inA
measure
range
Note:
Calibration
takes
20
seconds
to
complete.
5,
Place
the
Model
263
in
OPERATE
to
source
O.9nA
to
the
Model
236/237.
6.
Send
the
following
command
over
the
bus:
C43,O.9E9X
!
Calibrate
gain;
inA
measure
range
Note:
Calibration
takes
20
seconds
to
complete.
7,
Place
the
Model
263
in
standby
and
set
it
to
9nA.
8.
Send
the
following
command
over
the
bus:
C44X
!
Calibrate
offset;
lOnA
meas
ure
range
Note:
Calibration
takes
10
seconds
to
complete.
9,
Place
the
Model
263
in
operate
to
source
9nA
to
the
Model
236/237.
10.
Send
the
following
command
over
the
bus:
C45,9E—9X
!
Calibrate
gain;
lOnA
measure
range
Note:
Calibration
takes
10
seconds
o
complete.
11.
Place
the
Model
263
in
standby
and
set
it
to
9OnA.
12.
Send
the
following
command
over
the
bus:
C46X
!
Calibrate
offset;
lOOnA
meas
ure
range
Note:
Calibration
takes
4
seconds
to
complete.
13.
Place
the
Model
263
in
OPERATE
to
source
9OnA
to
the
Model
236/237.
14.
Send
the
following
command
over
the
bus:
C47,9OE9X
!
Calibrate
gain;
lOOnA
measure
range
Note:
Calibration
takes
4
seconds
to
complete.
15.
Place
the
Model
263
in
standby
and
set
it
to
O.9iA.
16.
Send
the
following
command
over
the
bus:
C48X
!
Calibrate
offset;
1iA
measure
range
17.
Place
the
Model
263
in
OPERATE.
18.
Send
IO9iA
(from
Table
23)
over
the
bus
with
the
C49
command
as
follows:
C49,Io9AX
!
Calibrate
gain;
ljiA
measure
range
For
example,
if
Io9LA
=
O.90036jiA,
send
C49,O.9OO36E6X.
19.
Place
the
Model
263
in
standby
and
set
it
to
9j.tA.
20.
Send
the
following
command
over
the
bus:
C5OX
!
Calibrate
offset;
lOjiA
meas
ure
range
6172
2-SIot
to
3Lug
Female
Triax
adapter
0000BOB
00:,
263
Source
(Source
1)
Note
:
263
GUARD
enabled
Figure
25.
Current
Ranges
Calibration
(inA
to
lOmA)
242
59
61
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
Other manuals for Keithley 237
Instruction Manual
93 pages
Applications Manual
201 pages
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Keithley 237 Specifications
General
Brand
Keithley
Model
237
Category
Measuring Instruments
Language
English
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