Owon VDS1022l User Manual page 20

Trigger Control
The oscilloscope provides two trigger types: single trigger and alternate trigger.
Single trigger: Use a trigger level to capture stable waveforms in two channels simultaneously.
Alternate trigger: Trigger on non-synchronized signals.
The Single Trigger and Alternate Trigger menus are described respectively as follows:
Single trigger
1. In Trigger menu, choose "Single" (the chosen label has a
2. Choose Source.
3. Choose Mode.
Single trigger has four modes: edge trigger, video trigger, slope trigger and pulse trigger.
Edge Trigger: It occurs when the trigger input passes through a specified voltage level with the specified slope.
Video Trigger: Trigger on fields or lines for standard video signal.
Slope Trigger: The oscilloscope begins to trigger according to the signal rising or falling speed.
Pulse Trigger: Find pulses with certain widths.
The four trigger modes in Single Trigger are described respectively as follows:
Edge Trigger
Choose Mode as "Edge". An edge trigger occurs on trigger threshold value of input signal. Select Edge trigger mode to trigger on rising edge or
falling edge.
Set in Trigger menu:
(1) Choose "Rise" to trigger on rising edge.
Choose "Fall" to trigger on falling edge.
(2) Click the voltage value after "Trigger" to show slider bar. You can also drag "13. Trigger point" in
(3) Choose Trig Mode.
Auto: Acquire waveform even no trigger occurs.
Normal: Acquire waveform when trigger occurs.
Single: When trigger occurs, acquire one waveform then stop.
(4) Set Hold Off: When trigger occurs, acquire one waveform then stop (100ns - 10s).
Setting method: "+", "++", "+++" is the position of digit that will be changed. "+" represents the last digit, "++" represents the middle digit,
"+++" represents the first digit. Eg. When "+" is chosen, click ▲, the last digit will be increased by 1.
Click "Reset" to set Holdoff time as default value (100ns).
Set in Trigger window:
Force: Force to create a trigger signal and the function is mainly used in "Normal" and "Single" mode.
mark).
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II. User Interface .