Fluke 91 Series II User Manual page 142

ScopeMeter Test Tool Tutorial
Tips and Techniques for a stable display:
If there is no highest pulse, there are two other techniques
to trigger on a waveform. These are:
- Using N-CYCLE delay.
- Using a stable trigger source on another input.
(I) Using N-CYCLE delay for waveforms with a
repetitive pattern.
Many waveforms are built from a repetitive pattern or
sequence of events. For example, a four-cylinder car
has four steps in its sequence, or a variable frequency
motor drive has a fixed number of pulses but varies
the frequency and repetition rate. The waveform on
TP3 has four pulses in its sequence of varying
amplitude. To simulate the non-triggerable waveform,
adjust the trigger level to a lower level.
1. Press .
2. Press .
3. Press
and press
4. Use to adjust the trigger level to about
1.00V (see Figure 8-9).
to highlight the "trigger level",
to select.
Figure 8-9 Triggering on N-CYCLE
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