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237
Keithley 237 Service Manual
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PRINT
“Voltage
Cal
ibrat
ion
Procedure,“
PRINT
“See
Service
Manual
for
details
on
test
connections,“
FR
1
NT
PRINT
“Short
236/237
output
and
193A
input,“
GOSUB
KeyCheck
PRINT
In,
“OUTPUT
1O;FOROS3GIX“
‘
193A
DCV,
61/2
digits,auto
range.
PRINT
1A1
“OUTPUT
16;N1X“
‘
Put
236/237
in
operate
PRINT
IAI,
“OUTPUT
16;COX“
‘
Put
236/237
in
cal
mode.
PRINT
“Performing
common
mode
adjustment.“
PRINT
“Please
wait
approximately
30
econds
for
completion.“
PRINT
PRINT
#1,
“OUTPUT
16;C1X“
•
Calibrate
236/237
common
mode.
PRINT
#
1
‚
“OUTPUT
1
0
;
Z
1
X“
•
Zero
1
9
3A.
BEEP
PRINT
#1,
“OUTPUT
16;C59X“
•
Remove
236/237
from
cal
mode
PRINT
111
‚
‘OUTPUT
1
6
;
NOX“
Put
236
/237
in
standby.
PRINT
“Remove
short
from
236/237
output
and
193A
input.“
PRINT
“Make
sure
236/237
output
is
properly
connected
to
193A
input.“
PRINT
GOSUB
KeyCheck
PRINT
111,
“OUTPUT
16;N1X“
•
Put
236/237
in
operate.
PRINT
#1
‚
“OUTPUT
16
;
COX“
•
Put
236
/237
in
cal
mode,
PRINT
“Performing
voltage
cal
ibration,“
PRINT
“Press
ESC
to
abort
procedure
and
restart
program.“
FOR
1
=
2
TO
Cmax
•
Loop
for
all
cal
polnts.
IF
1
=
26
THEN
PRINT
#1,
“OUTPUT
1O;R5X“‘
Put
193A
on
1000V
range.
IN$
=
INKEY$:
IF
IN$
CHR$(27)
THEN
PRINT
111,
“CLEAR“:
GOTO
SeiCal
PRINT
#1,
“OUTPUT
16;C“;
1.;
“X“
•
Send
cal
command
to
236/237.
GOSUB
Delay
•
Wait
for
settling.
PRINT
#1,
“ENTER
10“
•
Get
reading
from
193A.
INPUT
1/2,
Vmr
•
Input
193A
reading.
1
=
1
+
1
•
Increment
C
command
value.
PRINT
111,
“OUTPtJT
16;C“;
1;
“,“;
Vmsr;
“X“‘
Send
cal
value
to
236/237.
NEXT
1
•
Loop
back
for
next
cal
point.
PRINT
1/1,
“OUTPUT
16;C59X“
•
Exit
calibration
procedure.
PRINT
1/1,
“OUTPUT
16;NOX“
•
Put
236/237
in
standby.
PRINT
1/1,
“OUTPUT
1O;ZORSX“
•
Disable
193A
zero
mode,
100V
range.
RETURN
•
f
100MA
CURRENT
RANGE
CALIBRATION
ROUTINES
‚
CalHigh:
CLS
PRINT
“100
mA
Current
Range
Calibration.“
PRINT
“See
Service
Manual
for
test
connections.“
PRINT
GOSUB
KeyCheck
PRINT
PRINT
1/1,
“OUTPUT
1O;FOROS3GIX“
•
193A
DCV,
6—1/2
digits,auto
range.
InRes:
INPUT
“Enter
characterized
value
of
10
ehm
resistor“;
RiO
IF
RIO
<
9
.
9
OR
RiO
>
10.
1
THEN
BEEP:
PRINT
“Value
out
of
range.
“
:
GOTO
InRes
PRINT
“Disconnect
236/237
output
from
test
fixture.“
66
68
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 237 Specifications
General
Brand
Keithley
Model
237
Category
Measuring Instruments
Language
English
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