Keithley 237 - Page 135

Rotary
Knob
i
t
SECTION2
+
Operation
lections use one, two
or
three
pointers(") to indicate the
Setup Selections
trigger occurrence. For example:
(See Table
2-12)
IN
(See Table 2-14)
OUT
(See Table
2-13)
ORIGIN
I
Enable/Disable TRIGGERS
l
I
Enable/Disable SWEEP
END
I
"SRC
DLY
MSR
IN
For this selection, a trigger will cause a single source, de-
lay
and
measurement (one
SDM
cycle) to occur. The
Source Measure
Unit
will
then
pause
and
wait
for an-
other trigger. Another example:
Figure
2-48.
Trigger
Setups
2.22.1
Input
Triggers
For
this
selection,
two
triggers are
used
to process each
SDM
cycle. The first trigger sets the source level. The
Source Measure
Unit
then pauses
and
waits for the next
trigger. That next trigger initiates a delay
and
measure-
ment
to occur. Again the
Source
Measure Unit
pauses
and
waits for the another trigger.
There are a variety of
input
triggers to choose from which
are summarized
in
Table 2-12. Note
that
most trigger se-
Table 2-12.
Input
Triggers
Trigger
Selection
Description
CONTINUOUS
IN
Continuously process all
SDM
cycles.
"SRCDLYMSR
IN
Each trigger
will
process
an
SDM
cycle.
SRC"DLYMSR
IN
Initial trigger sets source. Each subsequent trigger initiates a delay
and
measure, then sets
source of next
SDM
cycle.
"SRC"DLY
MSR
IN Two triggers process each
SDM
cycle. First trigger sets source.
Second
trigger initiates a
delay
and
measure.
SRCDLY"MSR
IN
Initial trigger sets source
and
causes a delay. Second trigger initiates measure,
and
then, for
the next
SDM
cycle, sets source
and
initiates a delay.
"SRC
DLY"MSR
IN
Two triggers process each
SDM
cycle. First trigger sets source
and
initiates a delay.
Second
trigger initiates a measure.
SRC"DLY"MSR
IN
Initial trigger sets source. Two triggers process each SDM cycle. First trigger initiates a de-
lay. Second
trigger initiates a measure
and
sets source of next
SDM
cycle.
"SRC"DLY"MSR
IN
Three triggers process each
SDM
cycle. First trigger sets source. Second trigger initiates a
delay. Third trigger initiates a measure.
"SINGLE PULSE
IN
Pulse sweep trigger. Each trigger processes
the
on
time
(toN)
and
off time
(toFF)
of each pulse
in
the sweep. Two measurements are
made
for each pulse.
+
2-83