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237
Keithley 237 Service Manual
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SECTION
3
Maintenance
Message
Expianation
CAL
INVALID
ERR
On
powerup,
this
message
wffl
indicate
that
one
or
more
calibration
errors
exist.
The
Model
236/237
needs
to
be
recalibrated.
CAL
CONSTANTS
ERR
One
or
more
calibration
constants
are
not
within
allowable
limits.
Default
cal
constants
will
be
used.
Try
re-calibrating
the
Model
236/237.
Repeated
failures
may
indicate
de
fective
E
2
ROM
(U33).
IoU
CAL
CHECKSUM
Checksum
test
of
calibration
constants
failed.
Try
re-calibrating
the
instrument.
Re-
peated
failures
may
indicate
a
defective
E
2
ROM
(U33).
UNCALIBRATED
There
are
no
calibration
constants
stored
in
memory.
The
E
2
ROM
(U33)
may
be
defec
tive.
Note
that
the
Source
Measure
indicator
light
blinks.
IoU
DPRAM
FAILED
The
dual-port
RAM
for
the
I/O
controller
has
failed
making
the
instrument
non-func
tionaL
The
DPRAM
(U12)
may
be
defective.
IoU
EEROM
FAILED
The
E2ROM
(U33)
in
the
I/O
controller
has
failed
making
the
instrument
non-func
tional.
DPRAM
LOCKUP
The
source/measure
controller
cannot
respond
to
the
I/O
controller
due
to
RAM
(U13),
EPROM
(U17),
or
microprocessor
(U25)
failure.
The
instrument
is
non-func
tional.
DPRAM
LINK
ERR
Communications
error
in
the
DPRAM
(U12)
between
the
I/O
controller
and
the
source/measure
controller.
The
unit
is
non-functional.
1F
IoU
RAM
(U30)
failure.
Unit
is
non-functional.
2F
IoU
EPROM
(U31)
failure.
Unit
is
non-functional.
Note:
There
are
error
messages
associated
with
calibration
and
are
covered
in
the
calibration
section
of
this
manual.
82
84
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 237 Specifications
General
Brand
Keithley
Model
237
Category
Measuring Instruments
Language
English
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