Synchronization in PCI-6221

[Dimon87]

Hi. I use the device PCI-6221: 1 analog output and 5 analog inputs.  I set the waveform graph for the input signals. I generated the sine signal. The input waveform on the graph changed continually its phase. What have I to do  to leave the phase unchangable while changing the amplitude or the frequancy of the output signal?

Thank You.

[PBear]

Hi Dimon87,

Many times on a traditional scope, a waveform is displayed so that the zero crossing is triggered to be at x0. Is this what you are attempting to do? With 5 channels on a multifuction DAQ board, there is an interchannel delay (as you've discovered in other forum threads) between the channels so if you're looking for channel phase relationships, you'll be limited to this delay. It sounds like you're looping your analog output back into your 5 analog outputs so this would definitely have a phase delay between the 5 channels due to the interchannel delay. Your previous thread "Measuring the subtract of two phases" talks about this.