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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 II. User Interface
.
(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.
Video Trigger
Choose Mode as "Video" to trigger on fields or lines of NTSC, PAL or SECAM standard video signals.
(1) Select video modulation: NTSC, PAL or SECAM.
(2) Set trigger synchronization: Line, Field, Odd filed, Even filed or Line Number. When "Line Number" is selected, you can set the line
number.
(3) Set Hold Off. About the setting method, refer to Edge Trigger.
Slope Trigger
Choose Mode as "Slope" to set the oscilloscope as the positive/negative slope trigger within the specified time.
(1) Select slope condition.
(2) Set slope time.
(3) Set the High level upper limit and Low level lower limit.
(4) Set Trig Mode and Hold Off. About the setting method, refer to Edge Trigger.
Slew rate = (High level - Low level) / Settings
Pulse Width Trigger
Choose Mode as "Pulse". Pulse trigger occurs according to the width of pulse. The abnormal signals can be detected through setting up the pulse
width condition.
(1) Select pulse width condition and set time.
(2) Set trigger level.
(3) Set Trig Mode and Hold Off. About the setting method, refer to Edge Trigger.
Alternate trigger
Trigger signal comes from two vertical channels when alternate trigger is on. This mode is used to observe two unrelated signals. You can
choose different trigger modes for different channels. The options are as follows: edge, video, pulse or slope.
Set in Trigger menu:
1. In Trigger menu, choose "Alternate" (the chosen label has a mark).
2. Choose Source.
3. Choose Mode.
About the setting method of Mode and parameters, refer to Single trigger.
Note: In alternate trigger, only one channel at most can be set as Video mode. You can not choose Video in both channels. When VDS1022(I),
only channel 1 can be set as video mode.
Set in Trigger window:
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