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Keithley
Measuring Instruments
236
Keithley 236 Service Manual
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SECTION
2
Calibration
10.
Send
the
following
command
to
source
—0V
on
the
20.
Send
the
following
command
to
source
4OV
on
the
L1V
range:
11V
range:
C6X
!
Source
-O.OOOOV
C16X
!
Source
-4OOOOV
11.
Send
the
rneasured
voltage
reading
(VsR)
over
the
21.
Send
the
measured
voltage
reading
(VsR)
over
the
bus
with
the
C7
command
as
follows:
bus
with
the
C17
command
as
follows:
C17VMsX
!
Calibrate
gain;
-41V
source
C
7
,VsX
!
Calibrate
offset;
4.1V
source
and
measure
range
and
measure
range
22.
Send
the
following
command
to
source
+0V
on
the
12.
Send
the
following
command
to
source
4V
on
the
nov
range:
L1V
range:
C18X
!
Source
+000.00V
C8X
!
Source
-4.0000V
23.
Send
the
measured
voltage
reading
(VsR)
over
the
13.
Send
the
measured
voltage
reading
(VsR)
over
the
bus
with
the
C19
command
as
follows:
bus
with
the
C9
command
as
follows:
C19X,VMsX
!
Calibrate
offset;
+110V
source
C9,VsRX
!
Calibrate
gain;
—1.1V
source
and
measure
range
and
measure
range
24.
Send
the
following
command
to
source
+100V
on
the
14.
Send
the
following
command
to
source
+0V
on
the
110V
range:
11V
range:
C2OX
!
Source
+100.00V
c10x
!
Source
+00.000V
25.
Send
the
measured
voltage
reading
(VMSR)
over
the
bus
with
the
C21
command
as
follows:
15.
Send
the
measured
voltage
reading
(VsR)
over
the
bus
with
the
Cli
command
as
follows:
C21,VMsiX
!
Calibrate
gan;
+110V
source
and
measure
range
C11,VMsX
!
Calibrate
offset;
+11V
source
and
measure
range
26.
Send
the
following
command
to
source
—0V
on
the
110V
range:
16.
Send
the
following
command
to
source
+10V
on
the
11V
range:
C22X
!
Source
—000,00V
C12X
!
Source
+10.000V
27.
Send
the
measured
voltage
reading
(VMsR)
over
the
bus
with
the
C23
command
as
follows:
17.
Send
the
measured
voltage
reading
(VMSR)
over
the
bus
with
the
C13
command
as
follows:
C23,VMsRX
!
Calibrate
offset;
—110V
source
and
measure
range
C13,VMsX
!
Calibrate
gain;
+11V
source
28.
Send
the
following
command
to
source
—400V
on
the
and
measure
range
110V
range:
18.
Send
the
following
command
to
source
—-0V
on
the
C24X
!
Source
—100.00V
11V
range:
29.
Send
the
measured
voltage
reading
(VsR)
over
the
C14X
!
Source
——00.000V
bus
with
the
C25
command
as
follows:
19.
Send
the
measured
voltage
reading
(VisR)
over
the
C25,VMSRX
!
Calibrate
gain;
——110V
source
bus
with
the
C15
command
as
follows:
and
measure
range
C15,VMsX
!
Calibrate
offset;
-41V
source
Note:
Steps
30
through
37
apply
only
to
the
Model
237.
If
and
measure
range
calibrating
the
Model
236,
proceed
to
step
38.
2—8
55
57
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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