Analog Waveform Acquisition on Digital Input Drift

[downerdce]

Hello,

I'm trying to do continuous analog input monitoring using a digital input as a trigger.

It sort of works, but "drifts" to the right over time continually.

If I stop the process and start it again, the waveform is back where it should be.

The drift happens right in the DAQ assistant without even running the program.

Any ideas how I can solve this?

thank you

[bseguin]

It seems that your trigger is not electrically connected with your analog waveform.

How do you do this trig? you have a schematics?

Benoit