Operating
Your
Oscilloscope
To
trigger
01 a
co11plex
wavefor•
To
trigger on a complex waveform
The difficulty
in
viewing a complex waveform is triggering on the signal.
Figure 6 shows a complex waveform that is not synchronized with the
trigger.
The simplest trigger method is to trigger the oscilloscope on a sync pulse
that is associated with the waveform.
See "To trigger the oscilloscope"
on page
16.
If
there is no sync pulse, use the following procedure to
trigger on a periodic complex waveform.
1 Connect a signal to
the
oscilloscope.
2
Set
the
trigger level to
the
middle
of
the
waveform.
3 Adjust
the
Holdoff knob to synchronize
the
trigger
of
the
oscilloscope
with
the
complex waveform.
By
setting
the
Holdoff to synchronize
the
trigger,
the
oscilloscope
ignores the trigger that results in figure
6,
and waits for the trigger that
results
in
figure
7.
Also
notice
in
figure 6 that the trigger is stable, but
the waveform is not synchronized with the trigger.
Holdoff
operatllg
•lat
The
advantage
of
digital
holdotf
is
that
it
is
a
fixed
number.
As
a
result,
changing
the
time
base
settings
does
not
affect
the
holdotf
number;
so,
the
oscilloscope
remains
triggered.
In
contrast,
the
holdoff
in
analog
oscilloscopes
is
a
function
of
the
time
base
setting
making
it
necessary
to
readjust
the
holdoff
each
time
you
change
the
time
base
setting.
30
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