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Measuring relative phase between two waveforms using an ...

Measuring relative phase between two waveforms using an oscilloscope Overview There are a number of ways to measure the phase difference between two voltage waveforms using an oscilloscope. This document covers four methods and summarizes the advantages and limitations of each. Method Oscilloscope Requirements Waveform Requirements Advantages Limitations Time-difference 2 channels B a Lissajous 1 v. 2 mode Sinusoidal only D, E a, c product 1 2 mode Sinusoidal only A a, b Curvefitting 2 channels Data connectivity A, B, C, D d a: Errors introduced when dc offsets are present b: Reduced precision near = 0 , 180 c: Reduced precision near = 90 , 270 d: Possible incorrect solution A: No manual reading of values from display (can be automated) B: W

• Display the product of the two channels and calculate its dc offset automatically. This method was developed using the Tektronix 2012B oscilloscope. Waveforms: • Sinusoidal • Common frequency Method: • Display the two traces in voltage v. time mode, along with the product trace in voltage2 v. time mode. Use ac coupling.

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