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Keithley 236 Service Manual
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SECTION
3
Maintenance
multiplexer
switch
states
to
be
checked
and
signaitracing
to
the
A/D
input
to
be
performed.
Table
38
identifies
the
switch
that
is
closed
during
each
A/D
phase.
The
pin
numbers
of
multiplexer
UI
are
used
to
identify
each
switch.
Table
38.
Analog
Switching;
A/D
Mu1tip1ex
ing
AfD
Phase
Ui
Switch
Closed
(pins)
Reference
6,7
v
Measure
14,
15
1
Measure
10,
11
Zero
2,3
386
Digital
and
Display
Checks
The
digital
and
display
circuitry
can
be
checked
out
by
using
the
troubleshooting
data
found
in
Tables
39
and
3-10.
Note:
The
firmware
that
controls
the
Model
236/237
is
contained
in
two
EPROMs
(U17
and
U31).
If
it
is
neces
sary
to
replace
one
or
both
of
the
EPROMs,
make
sure
that
both
EPROMs
installed
in
the
instrument
have
the
same
firmware
revision
leveL
After
instaffing
new
firm
ware,
perform
factory
initialization
to
write
firmware
changes
to
the
E
2
ROM.
Factory
initialization
is
per-
formed
by
enabling
MENU,
displaying
FACTORY
INIT
with
the
rotary
knob,
and
then
pressing
ENTER.
CAUTION
The
EPROMs
are
static
sensitive
devices
that
are
susceptible
to
damage
by
routine
han
dung.
Be
sure
to
handle
the
devices
as
ex-
plained
in
paragraph
3.7.
3-16
86
88
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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