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Keithley 236 Service Manual
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SECYION
1
Performance
Verif-ication
t56
Low
Current
(inA
to
lOmA)
Measure
Ranges
Verification
Setup
the
equipment
as
shown
in
Figure
16
and
perform
the
following
steps
to
verify
the
inA
to
lOmA
measure
ranges:
L
Use
Table
1-6
to
caiculate
the
allowable
readings
for
the
ljiA
through
lOniA
ranges.
The
values
for
Io,
I9tA,
I9OA,
IO9mA
and
IL
were
previously
calculated
and
recorded
in
Table
13.
After
caiculating
these
readings,
transfer
them
to
Table
17.
2.
While
in
standby,
configure
the
Model
236/327
to
measure
currentby
settingit
to
source
0V
on
the
1.1V
source
range.
3,
While
in
standby,
set
the
Mode1263
to
the
2nA
range
and
enable
GUARD.
4,
Setthe
compliance
limit
ofthe
Mode1236/237
to
lnA
on
the
inA
measurement
range
and
enable
OPER
ATE.
Verify
that
the
current
measurement
on
the
Model
236
is
within
the
allowable
limits
listed
in
the
first
entry
of
Table
17.
5,
On
the
Model
236/237,
change
the
compliance
limit
to
lOnA
on
the
lOnA
measurement
range.
Verify
that
the
reading
on
this
measurement
range
is
within
the
lirnits
specified
in
the
table.
6.
Using
Table
17,
check
the
rest
of
the
Model
236
cur
rent
ranges
with
the
output
of
the
Model
263
in
standby.
z
ntertock
Cable
(236-lLC3)
‚
.
A
1_
::
‚ØØ
‚=‘
Waming:
Connect
to
Safety
Earth
Ground
1
IfllH
:
‚
193ADMM
Banane
Plug
Cables
(2)
236/237
0
—
0,
‘@@‘,
@:
UOBIOiLQDU:QNBOU
00
8006
Test
Fixture
A.
Connections
7O78TRX
Cables
(3)
236/237
OUTPUT
H
(Source
V)
SENSE
HI
SENSE
LO/OUTPUT
LO
B.
Schematic
Equivalent
Figure
1-5.
Setup
for
Remote
Sense
Verification
142
37
39
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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