monitoring the condition of three phase motor using NIUSB6009

[paed94]

I need to read the current (from current transformer AC1010) and voltage (PCB transformer 240Vac step down to 6Vac) from the USB NI6009 board. From the file, how can i put "phase different between voltage and current" on block diagram because i can't find it. Thanks

[RavensFan]

---

@paed94 wrote:

. From the file, how can I put "phase different between voltage and current" on block diagram because I can't find it. Thanks

---

What file are you talking about?  It sounds like you are referring to something you didn't include.

[paed94]

i mean the document i attached above.. "Untitled 2.vi 181Kb"

[RavensFan · Accepted solution]

Okay.

For some strange reason, when I saw this thread, there was nothing attached.  Since you hadn't edited the message to add the file, it must have been there.  Perhaps my browser failed to fully create the page and show it at that time.

What if you did an FFT on each signal?  Subtract the phase portions from each other.  Look for the bin that has the highest amplitude for voltage.  Use that to index out the difference in phase for that frequency.

Actually,  Extract Single Tone on each of the signals.  It is in the Signal Processing >>  Waveform Measurement palette.  It gives you the phase of each.  Then subtract those values.

[paed94]

ok thanks