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Pulse and Pulse-trains
Pulse-Train Set-Up10
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:
PULS-TRN PER: int
100·00000 us
freq period
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 set-up 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
(highest frequency) that can be set is the number of waveform points times 10·00 ns. To
achieve faster frequencies (up to the specification limit) the period must be changed from
the pulse-train set-up screen. Changing the frequency from the pulse-train set-up screen
causes the number of points to be reduced as the period is reduced (for periods less than
1·00 ms).
Because pulse-train waveforms are actually a particular form of arb and use clock
synthesis mode, pulse-train mode can also be operated with an external clock connected
to the rear panel ARB CLOCK IN/OUT socket or the system clock on multi-channel
instruments. To select external clock mode press the PULS-TRN PER soft key on the
PULS-TRN PER screen (or the PULSE FREQ soft key on the PULSE FREQ
screen) to change from internal to external clock. The screen changes to, for
example:
PULS-TRN PER: ext
source: ext arb clk
on a single channel instrument, or
PULS-TRN PER: ext
source: ext arb clk
freq: 10.0000000kHz
on a multi-channel instrument. It is then possible to select the source to be either an
external signal on the ARB CLOCK IN/OUT socket or the internal system clock; see the
Reference Clock IN/OUT and System Clock Setting sections of Chapter 15, System
Operations from the Utility Menu for the use of and frequency setting for the system
clock.
10-7
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