Keithley 237

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SECTION3
IEEE-488
Reference
Not
in
Remote-
Set
when
an
X
command
is received
over
the
bus
but
the
Model
236/237/238
is
not
in
remote.
The
NOT
IN
REMOTE message is displayed.
Measure Range
Changed
Due
to
1.1kV /lOOmA
or
llOV
/1A
Range
Select-
Set
when
the
source
and
measure
ranges
are
in
conflict (A,
B,
F,
L,
and
Q commands).
The
selected
ranges
cannot
be
1.1kV
and
100mA
(237),
or
110V
and
1A
(238)
simulta-
neously, either
when
sourcing
voltage,
measuring
current,
or
when
sourcing cur-
rent,
measuring
voltage for either
de
or
sweep
operation. The
instrument
displays a
MEAS
RANGE
CHANGED
message
and
the
measure
range
is lowered.
A
VALUE
OUT
OF
RANGE
message
is
displayed
as
the
compliance
value
is
applied
to
the
lower
range.
Measurement
Overflow
/Sweep
Aborted-
Set
when
an
external source
of
power
has
overloaded
the
measurement
hardware
of
the
Model236
/237/238.
A measure-
ment
overflow is indicated
at
112.5%
of
full scale range.
The
message
OFLO
is dis-
played
in
place
of
the
measurement
value. Also
set
when
a
sweep
has
aborted
(e.g.,
in
response
to
a
command
sent
while
a
sweep
is
in
progress).
Pending
Trigger-
Set
when
the
unit
is triggered
while
it
is processing a previous
command
(e.g.,
if
a front
panel
trigger is received
during
the
bus
hold-off time
of
a
Q
command,
or
if
a
bus
trigger is received
while
sweep
points
are
being
generated from
the
front panel). A PENDING TRIGGER message is
displayed
and
the
trigger is
saved
until
it
can
be
acted
upon.
UlO-
First
Sweep
Point
in
Compliance
The
U10
command
requests
the
instrument
to
search
the
sweep
buffer for
the
first
measurement
point
that
was
in
compliance.
The
point
is
not
sent
in
a fixed format
word,
but
in
the
output
data
format
previously
specified
by
a G (items), (format),
(lines)
command
(see
paragraph
3.6.6).
For
example,
if
the
source
and
measure
val-
ues
are
the
only
items
of
interest (as
shown
in
Figure 3-24),
use
the
following
pro-
gram:
10
20
30
40
50
60
70
REMOTE716
OUTPUT 716;"F0,1X"
OUTPUT 716;"G5,0,0X"
OUTPUT
716;''U10X"
ENTER 716;A$
PRINT
A$
End
!
Voltage
sweep
!
Source
and
measure
items, prefix
and
suffix
!
Send
first
sweep
point
in
compli-
ance
!
Get
sweep
point
!
Print
source
and
measure
values
When
no
sweep
points
are
in
compliance,
or
when
U10
is
programmed
while
in
de
operation,
only
terminator
characters
are
returned.
Note
that
the
''lines"
parameter
in
the
G
command
has
no
effect
on
the
U10
status
word.
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3-73