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The phase difference between two signals of equal frequency may be found from an elliptical Lissajous figure as the inverse sine of

  • A.the y intercept divided by the maximum y deflection
  • B.the ratio of the major to the minor axis of the ellipse
  • C.the width of the ellipse divided by its total height
  • D.the area of the ellipse divided by that of the circumscribing rectangle

Answer: A

Where the ellipse crosses the vertical axis the horizontal signal is zero, and the height at that point relative to the peak height is the sine of the phase angle. The method is quick and needs no calibration of either axis.

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