Keithley 237

Programming
Notes
+
SECTION3
IEEE-488
Reference
Figure
3-1
shows the
before/after
modification
of
a linear stair
sweep
waveform
with
the
program
listed
in
the
example below. The
output
level
of
point 2
is
changed
with
one
command,
and
the
delays of points 4
and
5 are changed
with
another com-
mand.
10
8
6
4
2
0
-2
Bias~
Sweep
Points
I
1
Before Modifying
Sweep
Points
I
After Modifying
1
1
2
1
3
1
4
1
5
I
I
I
I
I
I
I
I
I
I
L_
A,150,
4,5
I
2
I
3
I
4
I
5
L__!
t
Modify
Delay
of Points 4 and 5
A-2,
2,
2
Modify Output
Level
of
Point 2
Before
After
Modifying
Modifying
Sweep Source
Sweep
Source
Sweep
Point
Value Delay
Value Delay
1
2V
100
msec
2V
100msec
2 4V
100msec
-2V
100 msec
3
6V
100msec
6V
100msec
4
BV
100msec
BV
150msec
5
10V
100msec
10V
150
msec
Figure
3-1.
Modify
Sweep
List
1. Parameter
"first"
must
always
be
specified; omission causes
an
IDOCO.
2.
H
parameter
"last''
is
specified, a comma
must
precede it.
H
'1ast''
is
not
specified,
it's
preceding
comma
is optional.
3. You can modify
up
to
and
including the last defined
sweep
point.
An
attempt
to
modify a non-existent
sweep
point
is
ignored. For example,
an
attempt
to modify
points
50-150
of
a 100-point
sweep
yields a
MUST
CREATE
SWEEP
warning
con-
dition
and
the entire modify
command
is
ignored.
4.
In
autorange,
the
source range is adjusted for
the
highest on-scale sourcing possi-
ble.
5.
H
the source range is
not
specified,
the
instrument
will
try
to place
the
new
source
value
on
the
present
range.
This could result
in
a VALUE
OUT OF
RANGE
warn-
ing. Therefore,
it
is good practice to always specify a source
range
when
modify-
+
3-17