Hi Rodrigo Schneiater.
Thank you for answer me. I'll clarify the scenario for you.
Beyond the hardware that I had listed before, we have a scxi 1305 terminal block for current signal input.
We did some tests, in a frequency range between 60 up to 400Hz, like you sugested me. We used a current clamp, that have a constant phase error for all range of the test (comproved by oscilloscope measurements). This is the result for, discounted the error by the current clamp (3°):
60Hz - phase shift of 6.40° between voltage and current signal;
120Hz - phase shift of 11.15°;
180Hz - phase shift of 16.50°;
240Hz - phase shift of 21.66°;
300Hz - phase shift of 26.40°;
360Hz - phase shift of 30.70°;
400Hz - phase shift of 33.30°;
Thank you for help us.
