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237
Keithley 237 Service Manual
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SECTION
1
Performance
Verification
Table
14.
Required
Test
Equipment
Manufacturer
Model
Description
Specifications
54
/2
digit
Calibrator/
Source
44
/2
digit
Electrometer
3s1ot
Triax
cable
(3
required)
2-slot
male
to
34ug
fe
male
triax
adapter
(2
required)
Banana
plug
cable
(6
required)
2nA,
2OnA
ranges;
±(O.0625%
+
10
counts)
200nA
range;
±(O.035%
+
10
counts)
200mV,
2V
ranges;
±(O.005%
+
2
counts)
20V4000V
ranges;
±(O.007%
+
1
count)
2OO22OOk2
ranges;
±(ft007%.
+
2
counts)
2pA
range;
±(1.6%
+
66
counts)
2OpA
range;
±(1.6%
+
7
counts)
200pA
range;
±(L6%
+
1
count)
2nA
range;
±(O.25%
+
5
counts)
2OnA
range;
±(ft25%
+
1
count)
200nA
range;
±(025%
+
1
count)
2iA
range;
±(O.15%
+
4
counts)
2OjiA
range;
±(O.15%
+
1
count)
1OV4000V
ranges;
±0.002%
300mA
range;
±0.025%
±0.1%,
±l0ppm/°C
±0.1%,
±20ppm/°C
±0.1%,
±l0ppm/°C
±0.1%,
±l0ppm/°C
t5
VERIFICATIONS
PROCEDURES
The
following
paragraphs
contain
the
detailed
proce
dures
forverifying
the
one
year
accuracy
specifications
of
the
Model
236/237
using
the
equipment
listed
in
Table
14.
The
allowable
reading
limits
in
these
proce
dures
include
error
that
could
be
contributed
by
this
equipment.
These
procedures
are
intended
for
use
only
by
qualified
personnel
using
accurate
and
reliable
test
equipment.
If
the
instrument
is
out
of
specifications
and
not
under
war
ranty,
refer
to
the
calibration
section
of
this
manual.
WARNING
Lethal
voltages
(up
to
1000V
for
the
Model
237)
will
be
connected
to
the
Model
8006
test
fixture,
To
avoid
a
possible
shock
hazard,
the
safety
interlock
circuit
must
be
con
nected
to
the
Model
236/237.
54
/2
digit
DMM
Keithley
Keithley
Keitffley
Keithley
Keithley
Fluke
Valhalla
Keithley
Keithley
Keithley
Pomona
263
193A
617
8006
2364LC3
343A
2500E
R-185-10
R-249400
R2634k
R-263400K
7078-TRX
6172
B-24
Test
Fixture
Interlock
Cable
Dc
Voltage
Calibrator
Current
Calibrator
102
Resistor
1002
Resistor
lk2
Resistor
lOOk2
Resistor
12
27
29
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
4
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Keithley 237 Specifications
General
Brand
Keithley
Model
237
Category
Measuring Instruments
Language
English
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