Triggering on Waveforms
TDS 500B, TDS 600B, & TDS 700A User Manual
3–79
Either requires only that either one of the thresholds must be first crossed going
in either direction, then recrossed going in the opposite direction without the
other threshold being crossed at all.
For all three polarity settings, triggering occurs at the point the runt pulse
recrosses its first threshold.
Set the Mode and Holdoff. Mode and holdoff can be set for all standard trigger
types and classes. To set mode and holdoff, refer to Set Mode & Holdoff on
page 3–61. To learn more about trigger mode and holdoff, see Trigger Modes
and Trigger Holdoff on page 3–53.
When you select the pulse class Width, the oscilloscope will trigger on a pulse
narrower (or wider) than some specified range of time (defined by the upper
limit and lower limit). To set up for width triggering, do the following proce-
dures.
Select Width Triggering. Press TRIGGER MENU ➞ Type (main) ➞ Pulse
(pop-up) ➞ Class (main) ➞ Width (pop-up).
Select the Source. Press TRIGGER MENU ➞ Type (main) ➞ Pulse
(pop-up) ➞ Source (main) ➞ Ch1, Ch2, Ch3, or Ch4 (side). The source
selected becomes the trigger source for all four trigger classes.
Select the Polarity. Press TRIGGER MENU ➞ Type (main) ➞ Pulse
(pop-up) ➞ Class (main) ➞ Width (pop-up) ➞ Polarity (main) ➞ Positive or
Negative (side).
Set to Trig When. To set the range of widths (in units of time) the trigger source
will search for and to specify whether to trigger on pulses that are outside this
range or within this range, do the following steps:
1. Press TRIGGER MENU ➞ Type (main) ➞ Pulse (pop-up) ➞
Class (main) ➞ Width (pop-up) ➞ Trig When (main).
2. Press Within Limits (side) if you want the oscilloscope to trigger on pulses
that fall within the specified range. If you want it to trigger on pulses that are
outside the range, then press Out of Limits (side).
3. To set the range of pulse widths in units of time, press Upper Limit (side)
and Lower Limit (side). Enter the values with the general purpose knob or
keypad. The Upper Limit is the maximum valid pulse width the trigger
source will look for. The Lower Limit is the minimum valid pulse width.
The oscilloscope will always force the Lower Limit to be less than or equal
to the Upper Limit.
Trigger Based on
Pulse Width
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