Keithley 236 Service Manual

SECTION
2
Ccilibration
21.
Place the Model 263 in
OPERATE.
C58X
!
Calibrate inA to
lOmA
source
22.
Send
I9A
(from
Table
2-3)
over the bus
with the C51
ranges
command as
follows:
Note: Calibration of
the
bw current
source
ranges
C5l,I9AX
!
Calibrate gain;
lOjiA measure
takes
approximately
four minutes to
complete.
range
Note:
Check that
the
CAL
LOCK
switch
is in the
de
23.
Place the Model
263
in standby
and
set
it to
90j.tA.
sired
position; “in“
for permanent
calibration
or
24. Send
the following command over
the bus:
“out“
for temporary
calibration.
C52X !
Calibrate offset;
1OOiA
meas
38. Send
the following
command
over the bus:
ire range
25.
Place
the Model 263 in
OPERATE.
C59X
! EXit calibration
and
store cal
26.
Send
I9oA (from
Table
23)
over
the bus with
the
C53
constants.
command as follows:
If the switch
is in
the
“out“
position,
the message
C53,I9oAX
! Calibrate
gain;
1OOtA measure
“TEMPORARY CAL“
will
be briefly
displayed to
in
range
dicate that
newly entered
cal constants
will
be
lost
when the
Model 236/237
is turned
off.
Permanent
27.
Place
the Model
263 in
standby
and
set
it
to
O.9mA.
calibration
can
stillbe
done
by setting
the
calibration
28.
Send the
following
command
over
the bus:
switch
to
the “in“ position,
and
sending COX
and
C59X over the
bus in that
order.
C54X
!
Calibrate
offset;
imA measure
range
After
sending
the C59X
command,
the Model
236/237
will return to
normal
operation.
;
29. Place the Model
263
in OPERATE.
30. Send
IO9mA
(from
Table
23)
over
the
bus with the C55
Place the
Models
263
and 236/237
in standby.
command as follows:
C55,Io 9 X ! Calibrate
gain;
imA
measure
2.7
CALIBRATION
ERRORS
range
Calibration errors
and subsequent
error
messages
that
31.
Place
the
Model
263
in standby and
set it
to
9mA.
could occur
during
calibration are
explained
in Table 2-4.
32.
Send
the
following command
over
the bus:
Tt 5 important to
realize
that if
any of these errors
(except
IN
CAL)
occur,
calibration
is compromised.
Even
though
C56X
!
Calibrate offset;
lOmA meas-
some
errors will
cause default
cal
constants
to
be
used,
ure range
they
do
not guarantee
specified
accuracy.
When
a cali
bration
error occurs,
find and
fix
the problem
and repeat
33, Place
the
Model
263 in
operate.
calibration.
34, Send
I9
(from
Table
2-3)
over
the bus
with the
C57
command as follows:
Since calibration
error
messages
are
briefly displayed by
C57,I 9 X
!
Calibrate gain; lOmA measure
the
Model
236/237,
they can
be easily overlooked.
For
range
this
reason it is
strongly
recommended
that calibration
errors
be
detected
and displayed by
the
calibration
pro-
35, Place
the
Model
263
in standby
and set it
to
OmV. gram.
The
following
steps
provide
the generalprocedure
36. Place
the
Model
263
in
operate.
required
to
detect calibration
errors
over
the
IEEE-488
37,
Send
the
following
command over
the bus:
bus:
2-13

Keithley 236 Specifications

General

Brand	Keithley
Model	236
Category	Measuring Instruments
Language	English