Trigger Functions
5. Press the funct
ion button under the NEVENT menu item and then use the
right and left arrow keys to select the number of events.
6. Press the Trigger Level buttons to adjust the trigger level.
This screen
shows an N-Event trigger in which N=3. (See Figure 34.)
Figure 34: N-Event triggering
Trigger O n Video Signals
To trigger on a video signal, first select the standard of the video signal you are
going to measure, as follows:
1. Press the Trigger button.
2. Sel
ect TRIGGER OPTIONS.
3. Select Video on and press the Enter button.
4. Select a video standard, for example NTSC, and the polarity. Select positive
polarity for video signals with negative going sync pulses. If you select
no
n-interlaced, a scan rate menu will appear.
68 THS3000 Series Oscilloscopes User Manual
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