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Keithley 236 Service Manual
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Table
15.
Voltage
Measure
Verification
SECTION
1
Perfonnance
Verification
236/237
Compliance
Limit
Allowable
Reading
343A
Range
343A
Output
&
Measure
Range*
(18°C
to
28°C)
1OV
OV
1.1V
ftOOO3OV
to
+ft0003OV
1OV
0V
11V
OO.OO1OV
to
+OftOOlOV
1OV
OV
110V
OOOO1OV
to
+000.010V
10V
0V
1100V
0000.10V
to
+0000.10V
10V
+1V
1.1V
+0.99942V
to
+1.00058V
10V
—1V
1.1V
0.99942V
to
—1
.00058V
10V
+10V
11V
+9.9965V
to
+10,0035V
10V
40V
11V
—9.9965V
to
—10.0035V
100V
+100V
110V
+99.965V
to
+100.035V
100V
—100V
110V
—99.965V
to
—100.035V
1000V
+1000V
1100V
+999.55V
to
+1000.45V
1000V
—1000V
1100V
—999.55V
to
—1000.45V
*236/237
set
to
source
OnA
on
inA
source
range.
1
55
Remote
Sense
Verification
Set
up
the
equipment
as
shown
in
Figure
1-5.
The
1ki
re
sistor
(R2634k)
is
installed
in
the
Kelvin
test
socket.
Per
form
the
following
steps
to
verify
remote
sense
accuracy:
WARNING
When
a
Model
236/237
is
programmed
for
re
mote
sensing,
hazardous
voltage
may
be
pre
sent
on
the
SENSE
and
OUTPUT
terminals
when
the
unit
is
in
operate
regardiess
of
the
programmed
voltage
or
current.
To
avoid
a
possible
shock
hazard,
always
hirn
off
all
power
before
connecting
or
disconnecting
cables
to
the
Source
Measure
Unit
or
the
as
sociated
test
fixture.
1.
While
in
standby,
place
the
Mode1236/237
in
remote
sense
and
set
it
to
source
10V
with
a
compliance
limit
of
lOmA
on
the
lOmA
measurement
range.
Place
the
Model
236/237
in
standby.
2.
Set
the
Model
193A
DMM
to
DCV
and
select
the
20V
range.
3,
Temporarily
disconnect
the
banana
cable
from
VOLTS
HI
of
the
DMM
at
the
rear
panel
of
the
test
fixture
(BINDING
POST
1),
and
connect
it
to
VOLTS
LO
of
the
DMM.
This
shorts
the
input
of
the
Model
193A
DMM.
4,
On
the
Model
193A
DMM,
enable
ZERO
to
cancel
any
offsets.
5,
Reconnect
the
banana
cable
to
BINDING
POST
1
of
the
test
fixture.
6.
Place
the
Model
236/237
in
operate
and
verify
that
the
reading
on
the
DMM
is
within
the
following
a1
lowable
limit;
9.99500
V
to
10.00500V.
7,
Place
the
Model
236/237
in
standby
and
local
sense.
141
36
38
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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