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190 Series III
Users Manual
48
2. Use the cursor and E to select a Trigger Filter or set it Off.
3. Use the cursor and E to set NCycle to On.
Observe that the key labels at the bottom of the screen have been changed to allow further
selection of specific N-Cycle trigger settings.
4. Use
g f to set the number of cycles N.
5. Use
h i
to adjust the trigger level.
Waveforms with N-Cycle trigger (N=7) show on the display. See Figure 28.
Figure 28. Waveforms with N-Cycle Trigger
External Waveform Triggers (190-xx2)
Use external triggering when you want to display waveforms on inputs A and B while triggering
on a third signal.
You can choose external triggering with automatic triggering or with edge triggering:
1. Supply a signal to the red and black 4-mm banana jack inputs.
In this example you continue from the Trigger on Edges example.
To choose the external signal as trigger source:
2. Press
T to show the TRIGGER (On Edges) key labels.
3. Press 1 to select Ext (external) edge trigger.
Observe that the key labels at the bottom of the screen have been adapted to allow selection
of two different external trigger levels: 0.12 V and 1.2 V.
4. Press 3 to select 1.2V under the Ext LEVEL label.
From this point the trigger level is fixed and is compatible with logic signals.
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