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236
Keithley 236 Service Manual
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SECTION
1
Performance
Verification
1
5
9
1
OOmA
Source
Range
Verification
7
Verify
that
the
actual
current
(JOmA)
15
withrn
the
fol
lowing
limits:
Set
up
the
equipment
as
shown
in
Figure
1-9.
The
1O2
re
sistor
(R485-1O)
is
installed
in
the
test
sockeL
JOmA
OIflA
±2OLA
This
procedure
requires
the
characterized
value
of
the
8.
Set
the
Model
236/237
to
output
+9OmA.
lfl(2
resistor
for
current
caiculations.
The
characterized
9
Record
the
voltage
from
the
Model
193A
and
calcu
value
of
this
resistor
was
previously
recorded
in
step
43
late
the
actual
current.
of
paragraph
1.5.1
and
also
used
in
the
previous
para
graph.
Transfer
that
resistance
value
to
the
space
pro-
V÷9omA
_______________
V
vided
below:
V+9QmA
I+9OmA
=______________________
inA
Rio
=
Rio
Perform
the
following
steps
to
verify
the
lOOmA
source
10.
Verify
that
the
actual
current
(I+9o)
is
within
the
fol
range:
lowing
limits:
1.
While
in
standby,
set
the
Model
236/237
to
source
OmA
on
the
lOOmA
source
range
and
set
compliance
I+9OmA
89.9141flA
to
90.0861UA
to
1.1V.
2.
Set
the
Model
193A
to
the
2V
dc
range.
11.
Set
the
Model
236/237
to
output
-9OmA.
3,
Zero
the
Model
193A
by
shorting
its
input
(VOLTS
12.
Record
the
voltage
from
the
Model
193A
and
calcu
HI
to
LO),
and
enabling
ZERO.
late
the
actual
current.
4,
Remove
the
short
from
the
input
of
the
Model
193A.
5.
Place
the
Model
236/237
in
operate
and
record
the
V9o
=
______________
V
voltage
measurement
from
the
Model
193A
in
the
svace
below:
7
v
-9OmA
L9o
=
=______________________
mA
Rwe
V
0
m=
V
13.
Verify
that
the
actual
current
is
within
the
following
6.
Calculate
the
actual
current
through
the
resistor
as
limits:
follows:
VoA
L9OmA
=
89,914fllA
to
90.O86IflA
Io=
=___________
mA
R
1
o
0
14.
Place
the
Model
236/237
in
standby.
1-20
45
47
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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