Dear Sir
I am measuring induction motor current via current transformer (CT-Hall Type). Line current has 50 Hz frequency. Sampling rate is 2.5 KHz and I collect 2.5 K Samples. DAQ Card is NI PCI 6281, LabVIEW 2012. The problem I face is that the phase of the measured waveform appears different in every run of my vi. I could not understand that why phase of the waveform keep varying?? (attach are the some graphs and vi) while magnitude remain same. (Motor running under no load conditions and at constant speed).
Also I am calculating cross correlation between the measured waveform and simmulated waveform. But I could not understand why x-axix scale of the corelation garph Rxy has fixed range from 0 to 2.
Can anyone please explian me about the above stated two problems. I shall be thankful to you for your attention and consideration.
Kind Regards
Irfan