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236
Keithley 236 Service Manual
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SECTION
1
Performance
Verification
7.
Set
the
Model
263
to
output
+O.90000nA
on
the
2nA
larity
and
verify
that
the
reading
is
within
the
limits
range,
and
set
the
Model
236/237
compliance
limit
specified
in
the
table.
to
inA
on
the
lnA
measuiement
range.
10.
Using
Table
1-7
as
a
guide,
check
the
lOnA
through
8.
Verify
that
the
reading
is
within
the
limits
specified
lOmA
measurement
ranges
of
the
Model
236/237.
in
the
table.
11.
Place
the
Model
263
in
standby.
9,
On
the
Mode1263,
change
the
output
to
negative
po
Note
:
263
GUARD
enabled
Figure
1-6.
Setup
for
Low
Current
Measure
Ranges
Verification
(inA
to
lOrnA)
Table
1=6.
Allowable
Reading
Caiculations
for
Low
Current
Measure
Verification
(1iA
to
lOmA)
236/237
Allowable
Readmg**
Measure
Typical
Range
Reading
Calculations*
Lower
Limit
Upper
Limit
Limits***
1iA
+IO9M
±
[
(0.0004)
IO.9A
+
6OpA
1
=
+
.
i.LA
+
.
jiA
+O.90000iiA
±87OpA
—Io.9±[(O.OOO4)Io9+6OpAJ=
—.
iiA
—_.
jiA
—O.90000jiA±87OpA
lOjiA
+I9±[(O.OOO35)I9+7OOpA1=
+.__jiA
+._A
+9.0000j.tA±8nA
—I
9
A
±
[
(0.00035)
I
9
iA
+
700pA
1
=
—
.
iiA
—
•
iA
—9.0000pA
±8nA
lOOjiA
+I9OpA
±
[
(0.00035)
I
9
o
+
6flA
1
+
.
LA
+
.
.
ilA
+9O.OOOLA
±83nA
49OA
±
[
(0.00035)
I
9
O
+
6nA
1
=
—
.
—
jiA
—
.
—
iA
—9O.OOOiA
±83nA
1mJ
+IO9mA±[(O.00035)IO.9mA+6OflAj
+.
iiiA
+.
IflA
+O.900001TLA±800flA
—Io.mt±[(O.OOO35)Iosmi+6OnA1
.
flLA
.
iflA
0.90000fllA±800flA
lOmA
+I9mA
±
[
(0.00038)
Im
+
600flA
1
+
.
iiiA
+
.
fltA
+9.0000mA
±9.4iA
—I±[(O.OOO38)I+6OOnA]=
—.mA
—.mA
—9.OOOOmA±9.4iA
*
IO9pA,
I9A,
I9OiA,
IO9mA
and
I9flA
are
obtained
from
Table
1-3.
**
Allowable
reading
limits
are
to
be
transferred
to
Table
1-7.
***
fle
calculated
allowable
readings
should
be
within
the
listed
typicallimits.
These
limits
are
based
on
the
90-day
specifications
of
the
Model
263
and
193A.
A
calculated
allowable
reading
that
does
not
fall
within
these
limits
indicates
a
caiculation
error,
or
that
the
Model
263
and/or
Model
193A
is
out
of
specification.
LZJ
263
Source
(Source
1)
10000Boo
6ö:
LiQo
143
38
40
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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