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DAQ vi control unstable

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I am using the attached vi to control USB5133. It will collect a short period(512 points) waveform, if the input higher than the threshold.

 

When click the start button, it will start. If the signal is too small, you can change the value of the 'Trigger' to let it be triggerred.

 

The program is straight forward, but some time works well, sometime not. That means sometimes can also be triggerred when I set the trigger threshold high. Sometime cannot be triggerred though the thresh is low.

 

May you give any suggestion?

 

Also, is this trigger machnism works in hardware or a simulation in software. Thanks.

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Accepted by topic author alex.

It semms when the input signal is very low, the immediate type can still trigger, but the edge type cannot trigger any more, even I set the trigger level to 0.

 

Any suggestion?

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