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Keithley 236 Service Manual
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SECTION
2
Calibration
1.
Program
the
Model
236/237
to
generate
an
SRQ
on
4.
After
displaying
the
Ui
error
status
word,
send
the
an
error
by
sending
the
M32
command
over
the
bus.
U7
command
and
address
the
Mode1236/237
to
talk.
2.
When
an
SRQ
occurs
(error),
send
the
Ui
command
5.
Display
the
character
string
(U7
Calibration
Status
and
then
address
the
Model
236/237
to
talk.
Word)
on
the
Computer
CRT
and
refer
to
Figure
27
3.
Display
the
charaCter
string
(U
Error
Status
Word)
to
determine
whiCh
Calibration
step
failed.
This
from
the
Model
236/237
on
the
Computer
CRT
and
status
word
also
provides
the
status
of
the
CAL
refer
to
Figure
26
to
determine
the
type
of
error.
LOCK
switch.
Identifier
ERSbbb..bbb<TERM÷EOI>
Most
Significant
Bit
J
L
Least
Significant
Bit
I1
26Bit
ASCII
String
0
=
No
Error
1
=
Error
Most
Significant
Bit
Trigger
Overrun
IDDC
IDDCO
Interlock
Present
Illegal
Measure
Range
Illegal
Source
Range
Invalid
Sweep
Mix
Log
Cannot
Cross
Zero
Autoranging
Source
with
Pulse
Sweep
In
Calibration
In
Standby
Unitisa236
DU
DPRAM
Failed
IOU
EEROM
Failed
IOU
Cal
Checksum
Error
DPRAM
Lockup
DPRAM
Link
Error
Cal
ADC
Zero
Error
Cal
ADC
Gain
Error
Cal
SRC
Zero
Error
Cal
SRC
Gain
Error
Cal
Common
Mode
Error
Cal
Compliance
Eror
Cal
Value
Error
Cal
Constants
Error
Least
Significant
Bit
Cal
Invalid
Error
Figure
2-6.
lii
Error
Status
Word
2-15
62
64
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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