how to find phase angle using labview

[swathik]

Hi all,

        i am doing a project using myRIO. I have given analog inputs and i found out voltage and current of R and RL load. can any one tell me how to find out phase angle between voltage waveform and current waveform using labview. please any one help me.

[PauTec]

Hi, you can use extract single tone VI for each signal, then you just substract both phase angles.

http://digital.ni.com/public.nsf/allkb/F4BB644ECCA595D886256FFE00722E29

[swathik]

I tried using Extract signal tone but doesn't work it shows output value as NaN. I have tried different methods for finding phase angle but none worked out. please any one help me figure out this. i have to find phase angle for square wave. please any one help me.

[GerdW]

Hi swathik,

generic answer to your generic problem description: attach a VI with some sample data!

[santamaria]

I had the same issue, the extract single tone vi didnt work. I then opened the "extract single tone.vi" by double clicking on it and copied and pasted the whole block diagram contents onto my block diagram and it worked. Give this a try and it might also work for you. 

[altenbach]

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@santamaria wrote:

I had the same issue, the extract single tone vi didnt work. I then opened the "extract single tone.vi" by double clicking on it and copied and pasted the whole block diagram contents onto my block diagram and it worked. 

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That makes no sense at all!

Can you describe what did not work and what you did. (maybe attach the code before/after).

The same code gives in the same result unless something else is going (e.g. race condition, miswire, mistake, etc.)

[santamaria]

This also didnt make any sense to me. But thats what made my code work. I tried all the different apporaches using fft and correlation for 2-3 weeks searching on internet , posting on different forums asking different ppl around me. And i just gave this a try and it worked. I dont know how.  

[santamaria]

this only worked when the signal was given from the function generator. I haveyet to  figure out to find the phase when the signal is given from mics.