analog output signal phase shifted

[rumpschelektronik]

Hi all,

I want to output a sinusoidal signal with the soundcard of my PC.

For measuring the output signal, i use the NI DAQ USB 6009.

My Problem is: Whenever I start the VI, there is always a phase shift between the internally digital sine wave and the real externally generated analog outputsignal. The phase shift changes and is different to another moment.

Please help me.

[Ben]

Control the phase of the output on the sound card ..... Is it possible?

If not try using an output on your DAQ device.

Ben

[Coq_Rouge]

Your daq unit and the sound card is not synchronized, hence the phase shift. Your approach will never work. What are you trying to do? Maybe I can give you some pointers if I know more about your application