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Phase shift measurement

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Phase shift measurement

Postby jane » Thu Mar 08, 2012 4:55 pm

To find the phase shift between two signals (Ch A and B) I:
a) Add a cycle time measurement to Ch A (or B).
b) Use cursors to measure the time delay between signal A and B.
c) Calculate the phase shift from the information above.

Is it possible to implement a measurement into PicoScope 6 that calculates the phase shift (in deg) between Ch A and B.

BR
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Re: Phase shift measurement

Postby Martyn » Fri Mar 09, 2012 7:20 am

You can do this reasonably well using Maths Channels and the following equation

acos(integral(A*B)/(sqrt(integral(A*A))*sqrt(integral(B*B))))/Pi*180

although you have to take the value after the phase settles down as the start conditions are unknown and the first part of the trace will be inaccurate.
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Re: Phase shift measurement

Postby jane » Fri Mar 09, 2012 8:46 am

One word: Brilliant! :D
I ran a quick test connecting probe A/B before/after a filter and the phase shift read-outs matched the filter's transfer function very well.

Thank you!

BR,
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