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236
Keithley 236 Service Manual
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SECTION
2
Calibration
Table
22,
Specifications
For
Alternate
Equipment
Instrument
Type
Required
Specifications
DMM
Same
as
Keithley
193A
(see
Table
24)
Source
dc
Current
O.9nA,
9nA,
9OnA,
Same
as
Keithley
263
(see
Table
24)
O9jiA;
±l8Oppm
9jiA,
9OjtA,
900jaA,
9mA;
±l7Oppm
23
ENVIRONMENTAL
CONDITIONS
Calibration
should
be
performed
under
laboratory
con
ditions
having
an
ambient
temperature
of23°C
±1°C
and
a
relative
hiimidity
of
less
than
70%.
2A
WARMUP
PERIOD
WARNING
The
Source
Measure
Unit
is
equipped
with
a
3wire
power
cord
that
contains
a
separate
ground
wire
and
is
designed
to
be
used
with
grounded
outlets.
When
proper
connections
are
made,
instrument
chassis
is
connected
to
power
line
ground.
Failure
to
use
a
grounded
outlet
may
result
in
injury
or
death
due
to
electric
shock,
Turn
on
the
Model236/237
and
allow
it
to
warm
up
for
at
least
one
hour
before
performing
the
calibration
proce
dures.
If
the
instrument
has
been
subjected
to
extremes
of
temperature
or
humidity,
allow
at
least
one
additional
hour
for
the
internaltemperature
to
stabilize.
Typically,
it
takes
one
additional
hour
to
stabffize
a
unit
that
is
10°C
(18°F)
outside
the
specified
temperature
range.
25
CAL
LOCK
A
switch
(CAL
LOCK),
accessible
through
the
rear
panel
with
a
thin
shaft
screwdriver
(see
Figure
24),
is
used
to
prevent
inadvertent
calibration
of
the
Model
236/237.
CAL
LOCK
is
a
two
position
(in
and
out)
pushbutton
switch.
With
the
CAL
LOCK
switch
in
the
locked
“out“
position,
storage
of
calibration
constants
in
nonvolatile
memory
cannot
take
place.
Temporary
calibration
values
can
be
entered
and
used
with
CAL
LOCK
in
the
“out“
po
sition.
However,
when
power
is
turned
off,
the
newly
en
tered
calibration
constants
will
be
lost.
When
calibration
is
performed
with
CAL
LOCK
in
the
unlocked
“in“
position,
calibration
constants
will
be
stored
m
nonvolatile
memory
when
the
C59
command
is
sent
over
the
bus
2.6
CALIBRATION
PROCEDURES
The
step-by-step
procedures
for
calibrating
the
Model
236/237
are
provided
here.
Calibration
is
divided
into
three
separate
procedures
that
are
independent
of
one
another
That
is,
any
or
all
(in
any
order)
of
the
three
pro-
cedures
can
be
performed.
The
three
procedures
include;
voltage
calibration
(paragraph
2.6.2),
lOOmA
calibration
Model
236/237
Rear
Panel
Figure
24
.
Calibration
Switch
(Cal
Lock)
Calibration
Switch
2-2
49
51
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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