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291, 292, 294
Users Manual
screen on which the burst count and start phase are set. The other trigger parameters are
set on the TRIGGER IN set-up screen called by pressing the TRIG IN key.
source: int force
slope: positive
level: +1.4 V
period: 1.00ms
Trigger Source
The trigger source can be selected with the source soft key on the TRIGGER IN set-up
screen to be int, ext, man or an adjacent channel.
With int selected the internal trigger generator is used to initiate a burst; this generator
is set up as described in the previous section.
With ext selected the specified edge of the signal at TRIG IN is used to initiate a
burst.
With chan x selected (multi-channel instruments only) the trigger out signal from an
adjacent channel is used to initiate a burst; the source of the trigger out signal on that
channel x is set up as described in Adjacent Channel Trigger Output above.
With man selected as the source the only ways to initiate a burst are by pressing the
MAN TRIG key or by issuing a remote command. In multi-channel instruments pressing
MAN TRIG will trigger all those channels for which man has been selected as the
source.
Trigger Edge
The slope soft key is used to select the edge (positive or negative) of the
external trigger signal used to initiate a burst. The default setting of positive should
be used for triggering by the internal trigger generator or an adjacent channel's trigger
out.
Note that the trigger signal from SYNC OUT, used for synchronizing the display of a
triggered burst on an oscilloscope for example, is always positive-going at the start of the
burst.
Burst Count
The number of complete cycles in each burst following the trigger is set from the
TRIGGER/GATE SETUP screen called by pressing setup on the MODE screen.
TRIGGER/GATE SETUP:
burst cnt: 0000001
phase: +000.0º
(actual: +000.0º)
The required count can be set by pressing the burst cnt soft key followed by direct
entries from the keyboard or by using the rotary control. The maximum number of
waveform cycles that can be counted is 1,048,575 (2
20
-1)
7-4
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