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236
Keithley 236 Service Manual
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SECTION
2
.
calibration
2i
INTRODUCTION
Calibration
should
be
performed
every
12
months,
or
if
the
performance
verification
procedure
(Section
1)
shows
that
the
Model
236/237
is
out
of
specifications.
If
any
of
the
calibration
steps
cannot
be
performed
without
error,
refer
to
the
troubleshooting
information
in
this
manual.
If
the
problem
persists,
call
your
Keithley
repre
sentative
or
the
factory
for
further
information.
Calibration
of
the
Model
236/237
is
performed
over
the
IEEE-488
bus.
This
section
contains
the
stepbystep
ca1i
bration
procedures,
and
a
program
written
in
Microsoft
QuickBASIC
that
can
be
used.
Before
attempting
any
of
the
following
procedures,
make
sure
you
are
famffiar
with
the
controls
and
Operation
of
the
Model
236/237.
Refer
to
the
Model
236/237
Opera
tor‘s
Manual
for
complete
information.
22
RECOMMENDED
CALIBRATION
EQUIPMENT
Table
24
lists
recommended
calibration
equipment.
Note
that
the
Models
263
and
193A
must
be
within
their
9Oday
specifications
as
listed
in
the
table.
Alternate
equipment
may
be
used
as
long
as
their
accuracy
is
at
least
as
good
as
the
specifications
listed
in
the
Table
2-2.
Table
24.
Required
Test
Equipment
Manufacturer
Model
Keithley
263
Description
Keithley
Specifications
5-1
/2
digit
Calibrator/Source
193A
5-1
/2
digit
DMM
Keithley
2nA,
2OnA
ranges;
±(OO625%
+
10
counts)
200nA
range;
±(O.035%
+
10
counts)
8006
Keithley
Test
Fixture
R-185-10
200mV,
2V
ranges;
±(ft005%
+
2
counts)
20V-1000V
ranges;
±(0.007%
+
1
count)
2002-200k2
ranges;
±(0.007%
+
2
counts)
102
Resistor
R-249-100
R-263-lk
R-263-100K
1002
Resistor
1k2
Resistor
100k2
Resistor
±OJ%,
±10
ppm/°C
±0.1%,
±20
ppm/°C
±0.1%,
±10
ppm/°C
±0.1%.
±10
pvm/°C
2-1
48
50
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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