Keithley 237

+
SECTION3
IEEE-488
Reference
negative start value
and
a zero stop value.) The instrument displays a LOG CAN-
NOT CROSS 0 message;
pending
DOCs
are
ignored; no execution action is taken.
Af-
fected
DOC
is
Q.
Autoranging Source
with
Pulse
Sweep-
Set
when
you
try
to select autoranging of
the source
in
a pulse sweep
(Q
commands). The instrument displays a
NO
AUTO
IN
PULSE
message;
pending
DOCs
are ignored; no execution action is taken.
In
Calibration
-Set
when
non-calibration commands are requested while
in
calibra-
tion mode. The instrument displays
an
IN
CAL message; pending
DOCs
are ignored
except for
Nand
0;
the instrument stays
in
calibration mode. Non-affected
DOCs
are
C,
N,
0,
and
U.
In
Standby-
Set
when
a calibration command is requested while
in
standby
mode
(C command). The instrument displays
an
IN
STBY
message; the calibration com-
mand
is ignored; the instrument stays
in
standby mode.
Unitisa236-Setwhen
l.lkV
calibrationcommandsaresenttoaModel236(Ccom-
mand). The instrument displays a 236 UNIT message; the calibration command is ig-
nored; the instrument stays
in
calibration mode. This character is always zero for the
Models 237/238.
IOU
DPRAM
Failed-
Set
when
the dual-port RAM
in
the
I/
0
controller of the in-
strument
failed. The message
IOU
DPRAM FAILED is displayed; the unit is
not
functional.
IOU EEROM
Failed-
Set
when
the electrically erasable
ROM
in
the
1/0
controller
of the instrument failed. The message
IOU EEROM
FAILED is displayed; the unit is
not
functional.
IOU Cal. Checksum
Error-
Set
when
the JlX
or
power-up checksum test of the
IOU
cal constants failed. The message
IOU
CAL CHECKSUM is displayed.
Any
cal con-
stants outside predetermined limits are replaced
with
default values (see Cal Con-
stants Error).
DPRAM
Lockup-
Set
when
there is a
ROM
or
RAM failure
in
the
source/measure
controller so
that
it
is
not
responding to the
1/0
controller. The message DPRAM
LOCKUP
is displayed; the
unit
is
not
functional.
DPRAMLink
Error-Setwhen
there is a communication error
in
the
dual
port
RAM
between the
1/0
controller
and
the
source/measure
controller. The message
DPRAM LINK ERR is displayed; the
unit
is
not
functional.
Cal. AOC
Zero Error, Cal.
AOC
Gain Error, Cal.
SRC
Zero
Error, Cal.
SRC
Gain Error
- Set
when
the newly created cal constant is outside the expected value for
A/D
converter zero,
AID
converter gain, source zero,
or
source gain. A message is dis-
+
3-65