Keithley 237

LINEAR
STAIR
4.
Press ENTER The last
programmed
source
start
value
will
be
displayed. For example,
if
the
last pro-
grammed
start
value
was
1
V,
the
following
would
be
displayed:
+1.0000V
START
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 source level
at
which
the
sweep
will
STOP is displayed. For example
if
the
last
pro-
grammed
stop value is
10V,
the
following will
be
dis-
played:
+10.000V STOP
7.
To change
the
stop
value, key-in the value using the
keypad. The following shows a keyed-in value
of
20V:
+20
VOLTS
Note: Entering a stop
or
step value
that
will result
in
more
than
1000 measure points will cause
the
mes-
sage "BUFFER FILLED'' to
be
briefly displayed
when
the
sweep
is saved.
When
the
sweep
is
run,
it
will
stop
after the
1000th
measure
point
instead
of
af-
ter
the
programmed
stop level.
8.
Press ENTER The step value
will
then
be
displayed.
If,
for example,
the
step
is presently
1V,
the follow-
ing
will be displayed:
+
1.0000
STEP
9.
To change the step, key-in
the
value using
the
key-
pad. The following shows a keyed-in value
of
2V:
+2
VOLTS
Note: Entering a
step
value
that
is
lower
than
the
resolution of
the
source range will result
with
the
message "VALUE OUT OF
RANGE"
when
the
pa-
rameters are saved. A
step
value
of
zero will
be
used.
The source
will
never exceed
the
level
of
the first
sweep
point.
+
+
SECTION2
Operation
Note: The
maximum
step value is twice the full scale
range
of
the
highest range
used
in
generating the
sweep.
10.
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
11.
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
one
second:
1 SECONDS
12. Press
ENTER
The bias level
will
then
be
displayed.
For example,
if
the
bias is presently
set
to
OV,
the fol-
lowing
will
be
displayed:
+0.0000 V
BIAS
13. 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
14. 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
15.
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
highest keyed-in source value
will
result
in
the
mes-
sage
"VALUE OUT OF
RANGE"
when
the
parame-
ters are saved.
In
this situation,
the
source
will
de-
fault to
BEST
FIXED range.
16.
Press
ENTER
The following message will
be
dis-
played:
SAVE? ENTER/CANCEL
17.
At
this point,
the
keyed-in parameters can
be
entered
and
saved,
or
canceled. Perform
one
of
the
following
steps:
A.
To enter
and
save
the
keyed-in parameters, press
ENTER
The
GENERATING SWEEP message
2-69