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sometimes triggers on later pulses within this burst. We could further
stabilize triggering on the 1st pulse in this burst if we used the scope's
trigger holdoff capability. But what if we wanted to trigger on a specific
pulse (other than the 1st pulse)? We could accomplish this by using the
scope's "Pulse Width" triggering mode, which can be used on a continuous
data stream of digital pulses; the data stream does not need to come in
bursts. But the pulses must have a unique pulse width for this triggering
mode to be effective. Note that the 5th pulse within this burst has a
positive pulse width of approximately 300 ns. This is a unique pulse width
within this burst of pulses. Let's now set up the scope to trigger
specifically on this pulse.
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Figure 26 Triggering on a 300 ns wide pulse using the scope's Pulse Width triggering
2000 X-Series Oscilloscopes Advanced Training Guide
Advanced Triggering, Search & Navigation, and Segmented Acquisition Labs
Press the [Trigger] front panel key; then select the Pulse Width trigger
type using the Entry knob.
Press the " < > >< " softkey; then select the "><" time qualifier.
Press the " < 30 ns " softkey; then set the time to < 350 ns using the
Entry knob.
Press the " > 20 ns " softkey; then set the time to > 250 ns using the
Entry knob.
Set the scope's timebase to 500.0 ns/div.
mode.
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