DSO4000 Series Digital Storage Oscilloscope 64
3.9 Example 9: Using Overtime Trigger to Measure Long
Pulse Signal
It is not easy to observe some part of a long pulse signal by using the edge or pulse width trigger.
In such case, you can use the overtime trigger by following steps.
1. Push the TRIG MENU button to see the Trigger menu.
2. Push F1 to select OT for the Type option; push the Polarity option button to select Normal;
push the Mode option button to select Auto; push the Coupling option button to select DC.
3. Turn the Trigger Level knob to adjust the trigger level and stabilize video signals.
4. Turn V0 to adjust the line number (NTSC: 0-525 lines).
5. Turn the horizontal SEC/DIV and the vertical VOLTS/DIV knobs to display on the screen a
complete video signal triggering on a video line. See the figure below.
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