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281, 282, 284
Users Manual
A previously defined sequence can be run and stopped from this screen using the run
and stop soft-keys. The sequence can also be switched on from the
STANDARD WAVEFORMS screen with the sequence soft-key.
The segs= field shows the number of segments in the sequence; there is always at
least 1 segment.
Sequence Set-up
Pressing the sequence setup… soft-key on the SEQUENCE screen (or the
setup… soft-key next to sequence on the STANDARD WAVEFORMS screen) calls
the sequence set up screen:
seg: 2 off
wfm wv03
step on: count
cnt: 00001 done
Repeated presses of the seg soft-key steps the display through the set-ups of each of
the 16 segments of the sequence. With the exception of segment 1 which is always on
(and therefore has no on-off soft-key) the 16 segment set-ups are identical in format.
When segment 1 is displayed the segs= field shows the total number of segments in
the current sequence.
The segment to be set up is selected with the seg soft-key; the 16 segments can be
selected in sequence with repeated presses of the soft-key or by using the rotary control.
Once the segment to be edited has been set the waveform for that segment is selected
with the wfm (waveform) soft-key; the list of all arbitrary waveforms already created is
stepped through with repeated presses of the wfm soft-key or by using the rotary
control.
The criterion for stepping between waveform segments is set by the step on soft-
key. The default setting is step on: count which means that the waveform will
step on to the next segment after the number of waveform cycles specified in the cnt
(count) field; up to 32,768 cycles can be set with cnt selected, using direct keyboard
entries or by rotary control.
Alternatively, the step on criterion can be set to trig edge or trig level
in the step on field; trigger edge or trigger level can be mixed with count (i.e. some
segments can step on count, others on the specified trigger condition) but trigger edge
cannot be mixed with trigger level in the same sequence.
If trig edge is selected the sequence starts running at the first waveform segment
when sequence is set to run and steps to the following segments in turn at each
subsequent trigger. The trigger source can be any of the settings selected on the
TRIGGER IN set-up screen (called by the TRIG IN key); these are described fully in
chapter 7, Triggered Burst and Gate. At each trigger the current waveform cycle plus one
further whole cycle are completed before the waveform of the next segment is started.
If trig level is selected the sequence runs continuously through each segment in
turn (one cycle per segment) while the trigger level is true. When the trigger level goes
false the waveform currently selected runs continuously until the level goes true again at
which point the sequence again runs continuously through each segment in turn. The
trigger level source can be any of the settings selected on the TRIGGER IN set-up
9-14
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