Pulse Triggering
In Detail
3Ć96
Polarity
Use this menu item to specify the direction of the runt pulse.
Press TRIGGER MENU
➞
Type (main)
➞
Pulse (pop-up)
➞
Class (main)
➞
Runt (pop-up)
➞
Polarity (main)
➞
Positive, Negative, or Either (side).
H
Positive looks for positive-going runt pulses.
H
Negative looks for negative-going runt pulses.
H
Either looks for both positive and negative runt pulses.
Thresholds
To set the two threshold levels used in detecting a runt pulse:
1.
Press TRIGGER MENU
➞
Type (main)
➞
Pulse (pop-up)
➞
Class (main)
➞
Runt (pop-up)
➞
Thresholds (main).
2.
Use the general purpose knob or keypad to set the values for the high
and low thresholds.
Hint: To use the Trigger Bar feature to set the threshold levels on the
pulse train, press DISPLAY
➞
Readout Options (main)
➞
Trigger Bar
Style (side) until
Long appears in that menu item.
Note the position of the trigger indicator in Figure 3-43. Triggering occurs at
the point the pulse returns over the first (lower) threshold going negative
without crossing the second threshold level (upper). Be aware of the following
considerations when using Runt triggering:
H
When Positive is set in the Polarity side menu, the
lower threshold must
be first crossed going
positive, then recrossed going negative without
crossing the
upper threshold at all.
H
When Negative is set in the Polarity side menu, the
upper threshold
must be first crossed going
negative, then recrossed going positive
without crossing the
lower threshold at all.
H
When Either is set in the Polarity side menu,
one threshold must be first
crossed going in
either direction, then recrossed going in the opposite
direction without crossing the
other threshold at all.
H
Regardless of the polarity setting, triggering occurs at the point the runt
pulse
recrosses its first threshold.
Содержание TDS 620
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