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281, 282, 284
Users Manual
Pulse 1 delay
program +0·000 ns
(actual +0·000 ns)
done next
The pulse delay is entered in the same way as the pulse width and, again, the actual
delay is shown below the program delay for the same reasons. The delay value that
can be entered must be in the range ± (pulse-train period -1 point); positive values delay
the pulse with respect to waveform sync from SYNC OUT; negative values cause the
pulse to be output before the waveform sync.
Pressing next on this screen calls the first of the three screens for setting the
parameters of Pulse 2, and so on through all the pulses in the pulse-train. In this way all
parameters of all pulses are set. The pulse-train is built when next is pressed on the
last screen of the last pulse or when done is pressed on any screen.
You must be careful to ensure that the set widths and delays of the individual pulses are
compatible with each other and with the overall pulse-train period. Thus delays must not
be such that pulses overlap each other and the delays plus widths must not exceed the
pulse-train period; unpredictable results will occur if these rules are not followed.
Once the pulse-train has been defined the period can be adjusted irrespective of the pulse
width and delay settings for the individual pulses because, unlike a conventional pulse
generator, the individual pulse widths and delays are adjusted proportionally to the period
as the period is changed.
Period can also be changed from the PULSE-TRN PERIOD screen called by pressing
the FREQ key with pulse-train mode selected:
PULSE-TRN PERIOD
1
00·0us
done next
The new setting can be entered either as a period in the way already described, or as a
frequency by first pressing the freq soft-key. However, changing the period or
frequency from this screen is slightly different from changing the period on the
pulse-train setup screen. When changing from this screen the number of points
in the waveform is never changed (just as with a true arb) which means that the shortest
period that can be set is the number of waveform points times 25.00 ns. To achieve
higher frequencies (up to the specification limit) the period must be changed from the
pulse set-up screen; changing the frequency from this screen causes the number of points
to be reduced as the period is reduced (for periods less than 1·25 ms).
Waveform Hold in Pulse and Pulse-Train Modes
Pulse and pulse-train waveforms can be paused and re-started on any channel by using
the front panel MAN HOLD key or a signal applied to the rear panel HOLD IN socket.
On multi-channel instruments the channels which are to be held by the MAN HOLD key
or HOLD IN socket must first be enabled using the ARB HOLD INPUT screen,
accessed by pressing the HOLD key:
10-6
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