I have read every post regarding how to obtain the phase difference between 2 input signals of the same frequency. I am using Labview 7 and have simulated the signals into my vi and everything worked great. I then input a signal into the 2 channels and used an RC filter to induce a phase shift and I can't get the phase results to work, althought the amplitude component works great.
I have tried extracting the phase info by using 3 methods a)tone measurements interface in 7 b) spectral measurements interface in 7 c) extract single tone information.vi All of the above methods produce the same result, which unfortunately is incorrect. I have set up the 2 inputs with DAQ Assistant and the signals are good and 90 degrees out of phase. After extracting the phase info from each signal using any of the above methods, I subtract one from the other . I have tried both ways of subtraction and no difference. Any ideas? Do I have to trigger the signals externally or something like that? Any suggestions would be greatly appreciated. Thanks
