Keithley 237

SECTION3
IEEE-488
Reference
Programming
Notes
Programming
Example
3-24
+
1.
Each C command
is
sent separately
and
followed
with
an
X.
2.
Calibration step parameters
must
be
explicitly declared; no defaults are allowed.
3. The U7 calibration status
word
indicates the calibration step
in
progress, the
posi-
tion
of
the CAL
LOCK switch,
and
whether the
unit
is calibrated. (See paragraph
3.6.19.)
4. Error conditions for the C command are described
in
the
U1
error status
word
(see
paragraph
3.6.19).
5.
Execution
of
the C command places the instrument
in
an
untriggered state.
Dur-
ing a calibration procedure
(CO
through
C59), the
unit
will
ignore
any
triggers.
If
the
instrument
is
triggered from
the
front panel while
it
is
being calibrated, the
PENDING TRIGGER message
is
displayed,
but
when
the calibration procedure
is
ended
with
C59X,
the
sweep
is
not
started.
6.
The
C1
through
C59 commands
will
be
ignored
if
the enter cal procedure
(COX)
command
was
not
sent first.
7.
The present calibration constants
will
only
be
saved
to
non-volatile memory
upon
execution of C59X
if
the CAL LOCK
button
is
in
the unlocked position.
8.
Entering the cal procedure
with
COX
will
automatically set certain operating pa-
rameters for calibration
without
user intervention (e.g., integration time to line
cycle). These changes
will
not
be
reflected
in
the
U
status words. Exiting from the
cal procedure
with
C59X
will
return
the parameters to the user-programmed set-
tings.
9.
The only commands permitted
during
a cal procedure are C (calibration), N
(operate/standby),
0
(output
sense),
and
U
(status). All others
will
cause
an
error.
10.
The reading
done
bit
in
the SRQ byte will
be
set after completion
of
a cal step.
However,
no
measurement will
be
available for output.
11. Calibrating the
1100V
range requires
that
the
range
is
enabled
with
the
V1
com-
mand
(see
paragraph
3.6.20).
CAUTION:
The following examples
are
only to
show
proper
syntax. Only send
cali-
bration commands
when
actually calibrating the instrument. A complete IEEE-488
calibration procedure
is
contained
in
the
Model236/237
/238 Service Manual.
OUTPUT
716;"COX"
OUTPUT
716;"C1X"
OUTPUT
716;"C2X"
OUTPUT
716;"C3,.001X"
+
!
Enter calibration
!
Common
mode
adjustment
!
Set
up
1.1Voffset cal.
!
Send measured offset