Hitachi V-151F - Waveform Observation Techniques

selection (lO)
Select the sweep mode by the MODE selector .
When no input signal is applied or the trigger
level is not correct, set the selector to NORM
to remove waveforms on the screen.
The triggered sweep circuit of this instrument
stops functioning if a trigger pulse is not
produced as a sweep starting pulse. It is,
therefore, necessary to select this sweep ac
cording to purpose desired. Generally, for
waveforms which have a frequency of 20Hz or
more and are not complex, use AUTO triggering.
At AUTO triggering, the sweep circuit is auto
matically placed in the free-run state when the
aforememtioned trigger pulse is not produced
and a horizontal trace is displayed irrespective
of sweep time set by the knob @ .
Next, set the synchronizing polarity to either
PUSH (+) or PULL (-) by the LEVEL knob and pro
vide synchronization by turning the knob to
stabilize the waveform.
* Explanation of the synchronizing polarity level.
PUSH (+) SLOPE ^
The polarities synchronize with
each other in the solid line parts.
PULL (-) slope
* Explanation of the synchronizing level.
- +
When the slope is positive (+)
When the slope is negative (-)
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