| Trigger polarity | Function | 
|---|---|
| Negative Edge [default] | The negative edge of the input signal of an external trigger is a trigger signal. | 
| Positive Edge | The positive edge of the input signal of an external trigger is a trigger signal. | 
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 | To select external trigger polarity, use the following softkeys: Stimulus > Ext Trigger > Polarity Then select the required external trigger polarity: •Negative Edge •Positive Edge | 
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