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condition, the oscilloscope will trigger. For example, the signal contains such aberrant pulses
as shown below, you may select '≠' or '<' to trigger on the pulse.
As shown in the above figure, you can get a stable waveform display if inputting a square wave at
the frequency of 1KHz, with pulse width set to 500μs.
6.7 Example 7: Triggering on Video Signal
Assume that you are monitoring the video signals of a television to see if they are input normally,
and the video signal is of an NTSC system. You can get a stable display by using the video trigger.
Triggering on Video Fields
To trigger on the video fields, follow the steps below.
1.
Push the TRIG MENU button to see the Trigger menu.
2.
Push F1 to select Video for the Type option.
3.
Push the Source option button to select CH1; push the Polarity option button to select Normal;
push the Standard option button to select NTSC.
4.
Push the Sync option button to select Odd Field, Even Field or All Fields.
5.
Push the Trigger Level button to adjust the trigger level and stabilize video signals.
6.
Push the horizontal TIME/DIV and the Vertical Position keys to display on the screen a
complete video signal triggering on a video field.
The figure below shows a stable signal triggering on a video field.
DSO1000E Series HandHeld Oscilloscope User Manual
Application Examples
50
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