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7.3. Setting the Trigger System
The Trigger defines the time when the acquisition of data and display of waveform. If it is set correctly, the
trigger can turn an unstable display into a significant waveform.
When starting the acquisition of data, the oscilloscope collects sufficient data to draw the waveform at the left
side of the triggering point. With waiting for the triggering condition, the oscilloscope is gathering data
continuously. After a trigger is detected, the oscilloscope gathers enough data continuously to draw the
waveform at the right side of the triggering point.
To make a trigger mode setting, do the following:
1.
Press the MENU key and the function menu appears at the right of the screen.
2.
Press the MENU ▲ or MENU ▼ key to select TRIG MODE and five options are displayed at the bottom
of the screen.
3.
Select from F1 to F5 key to make a different setting.
4.
Press OPTION and left bottom display as below during edge trigger and video trigger:
- Time
- Trig
Left bottom display as below during alternate trigger:
- Time
- Trig1
Press ▲(yellow) or ▼(yellow) to adjust trigger vertical position, Press ◄(yellow) or ►(yellow) to adjust
5.
time base horizontal position or adjust horizontal position.
7.4. Triggering Control
There are three triggering modes including Edge triggering, Video triggering and alternating triggering. Each
trigger mode is set by different function menu.
*
Edge triggering: The edge trigger type triggers on the incoming signal edge. Use the edge trigger for all
signals except for video related ones.
*
Video triggering: Perform video field trigger or line trigger on the standard video signals.
*
Alternate trigger: When the signal frequency different in Channel 1 and 2, it can also guarantee the
stability approaching in two channels.
The following describes the Edge triggering, Video triggering and Alternating triggering menus respectively.
7.4.1. Edge Triggering
The Edge triggering is a mode by which trigger occurs at the triggering threshold value of the input signal
edge. With the Edge triggering selected, the trigger happens on the rise or fall edge of the input signal,
shown as the following Figure.
- Time base
- Trig
- Time base
- Trig2
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