Keithley 237

SECTION3
IEEE-488
Reference
+
3.6.8
J -
Self-tests
Purpose
Format
Parameters
Description
Programming
Notes
Programming
Example
3-36
To
restore
factory
defaults
and
test
memory
and
front
panel
display.
JnX
JOX
JlX
J2X
Restore
factory
defaults
Perform
memory
test
Perform
display
test
The
JOX
command
starts
execution
of
the
complete
power-up
initialization
and
re-
stores
parameter
values
to
their
factory
defaults.
(See
Table
3-4
for
power-up
and
fac-
tory
default
values.)
The
JlX
command
performs
the
memory
test
portions
of
the
power-up
sequence.
For
example,
if
the
checksum
test
of
the
calibration
constants
fails,
the
message
IOU
CAL
CHECKSUM
is
displayed.
The
J2X
display
test
momentarily
lights
all
segments
of
the
display
for
your
inspection.
1.
Allow
approximately
three
seconds
for
the
instrument
to
complete
the
factory
default
test.
All
other
tests
are
shorter.
2.
The
instrument
holds
off
bus
operation
with
the
NRFD
line
during
self-test
op-
eration.
Thus,
no
commands
can
be
sent
during
the
self-test
if
hold-off
on
X
is
en-
abled.
3.
Examine
the
error
status
word
with
the
Ul
command
to
determine
what
failures
occurred.
This
is
shown
in
the
programming
example.
4.
Each
J
command
must
be
sent
with
a X
immediately
following
the
numerical
parameter
(i.e.,
JOX).
10
20
30
40
50
60
70
80
DIM
Error$[50]
REMOTE716
OUTPUT
716;"J1X"
WAIT2
OUTPUT
716;''U1X"
ENTER
716;Error$
PRINT
Error$
END
+
!
Dimension
for
error
status
!
!
Perform
memory
test
!
Wait
for
test
execution
!
Request
error
status
word
!
Get
error
status
!
Print
error
status