Keithley 237

+
SECTION3
IEEE-488
Reference
Identifier
~
DSSn
n n n
<TERM+
EOI>
T
Figure
3-22.
US
Defined
Sweep
Size
U9-
Warning Status Word
Number
of
Source
Values
in
Sweep
Buffer
The
U9
command
allows
access
to
Model236/237
/238
warning
conditions.
The
warning
status
word
(Figure 3-23)
is
actually a
string
of
ASCII characters represent-
ing
binary
bit
positions.
Reading
the
U9
status,
a
OCL
or
SOC,
or
a
JOX
command
clears
the
bits. A
warning
condition
is flagged
in
the
serial
poll
byte
while
any
warn-
ing
bits
in
the
warning
status
word
are
set.
The
instrument
can
be
programmed
to
generate
an
SRQ
when
a
warning
condition
occurs (see
paragraph
3.6.11).
Identifier
~
W R
S
b b b
...
b b b <TERM +
EOI>
Most
Significant
Byte
_j
L
Least
Significant
Byte
I
1
0-byte
ASCII
String
0
=No
Error
1 =Error
Most
Significant Byte
Uncalibrated
Temporary
Cal
Value
Out
of
Range
Sweep
Buffer
Filled
No
Sweep
Points,
Must
Create
Sweep
Points
Pulse
Times
Not
Met
Not
In
Remote
Measure
Range
Changed
Due
to
1
kV/1
OOmA
or
11
OV/1
A
Range
Select
Measurement
Overflow
(OFLO)/Sweep
Aborted
Least Significant Byte
Pending
Trigger
Figure
3-23.
U9
Warning
Status
Word
The
various
bits
in
the
U9
warning
status
word
are
set
when
the
following conditions
are
present:
Uncalibrated
-
Set
when
the
unit
detects
that
illegal cal
constants
are
stored
in
EEROM.
The
message
UNCALIBRATED is displayed;
the
Source/Measure
LED
blinks.
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3-71