HP 54540 Series - Page 106

Figure 5-15
Figure 5-16
Trigger
Glitch Trigger Mode
Glitch timing requirements
For the oscilloscope to trigger on a glitch, the opposite polarity of the glitch
must be present for at least 5 ns. The polarity of the glitch is determined by
the trigger level. Voltages above the trigger level are of positive polarity, and
voltages below the trigger level are of negative polarity. For example, Figure
5-15 shows a positive polarity glitch. The signal must be below the trigger
level for at least 5 ns for the oscilloscope to detect the glitch. Ifa negative
polarity glitch is selected, then the signal must be above the trigger level for
at least 5 ns for the oscilloscope to detect the glitch.
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If the selected glitch width is from 2.5 ns to 20 ns, the time between similar
edges must be greater than the selected glitch width. Figure 5-16 illustrates
the timing between like edges. For example, if the selected width is 10 ns,
then the time from point A to point B must be greater than 10 ns.
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