Keithley 237

SECTION2
Operation
1.
Select the desired source (Source I Measure
V,
or
Source
V Measure
I).
2.
Enable sweep create.
3.
Use
the
SELECT
buttons to display the fixed level
sweep (as shown below).
FIXED
LEVEL
4.
Press ENTER. The last programmed source level will
be displayed. For example,
if
the last programmed
source level was 1
V,
the following would be dis-
played:
+
1.0000
V
LEVEL
5.
To change the source value, key-in the value using
the keypad (edit method; see paragraph 2.9.1). For
example, the following shows a keyed-in value of
2.5V.
+2.5
VOLTS
6.
Press
ENTER.
The number of measurement points
in
the fixed sweep
will
be displayed. For example
if
the
last programmed number of points was
10, the
fol-
lowing will be displayed:
0010
NO.
POINTS
7.
To change the number of measurement points
(0001
to
1000),
key-in the value using the keypad. The fol-
lowing shows a keyed-in value
of
20
points:
20
NO. POINTS
Note: Entering a value that exceeds
1000
will
simply
default to
1000.
8.
Press ENTER. The delay
will
then
be
displayed.
If
the delay is presently set to
1/2
second, the following
will be displayed:
00.500
SEC
DELAY
9.
To change the time delay
(00.000
to
65.000
seconds),
key-in the value using the keypad. The following
shows a keyed-in value
of
1 second:
1
SECONDS
10.
Press
ENTER.
The bias level will then be displayed.
2-68
For example,
if
the bias is presently set to
OV,
the fol-
lowing will be displayed:
+0.0000
V
BIAS
+
+
11.
To change the bias level, key-in the value from the
keypad. The following shows a keyed-in bias level of
-1.25V:
-1.25
VOLTS
12.
Press ENTER. The currently selected source range
will
be displayed. For example,
if
autorange is cur-
rently selected, the following
will
be displayed:
AUTO
RANGE
13.
Tochangethesourcerange, usetheSELECTbuttons
to display the desired range. The following shows
the
11
V
range selected:
ll.OOOV
RANGE
Note: Selecting a fixed range that is lower than the
keyed-in level
or
bias value
will
result
in
the message
''VALUE
OUT OF
RANGE"
when
the parameters
are saved.
In
this situation, the source
will
default to
BEST
FIXED
range.
14.
Press ENTER. The following message will be dis-
played:
SAVE?
ENTER/CANCEL
15.
At
this
point, the keyed-in parameters can
be
entered
(saved),
or
canceled. Perform one
of
the following
steps:
A.
To enter
and
save the keyed-in parameters, press
ENTER. The GENERATING SWEEP message
will
be
displayed. Sweep create
will
disable
and
the Source Measure
Unit
will
return to the
source-measure display state.
B.
To cancel the keyed-in parameters, press CAN-
CEL.
Sweep create
will
disable
and
the Source
Measure
Unit
will
return to the source-measure
display state. The previously programmed
sweep parameters
will
prevail.
2.19.5 Linear Staircase
Sweep
Perform the following steps to create a sweep list for a lin-
ear staircase sweep waveform (see Figure
2-32):
1.
Select the desired source (Source I Measure
V,
or
Source
V Measure
I).
2.
Enable sweep create.
3.
Use
the
SELECT
buttons to display the linear stair-
case sweep (as shown below).