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SWEEP AND TRIGGER
l
knob. The LEVEL corresponds to detected levels displayed on the CRT between the bottom graticule (full
CCW) and the top graticule (full CW).
An RF envelope will trigger the sweep only if it is capable of being traced on the CRT display-that is, the
resolution bandwidth and video bandwidth are wide enough to pass the modulation waveform of an input signal.
Example
A zero span display of this video waveform will trigger
for all LEVEL knob settings.
If the video signal lowers on the display, the LEVEL
must be
towards the minus side.
set
If the level does not cause a trigger within 25 msec, the sweep will be triggered anyway to ensure a display. Note
that this is
only for sweep times ~10 msec.
true
EXTERNAL TRIGGER INPUT
i
M a n u a l O p e r a t i o n 8 1
TRIGGER
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