RIGOL
© 2008 RIGOL Technologies, Inc.
User’s Guide for DS1000E, DS1000D Series
Figure 3- 6
Ellipse method to observe the phase difference
Sin
θ = A/B or C/D, where θ = phase shift (in degrees) between the two signals.
From the formula above, you could get:
θ = ±arcsine (A/B) or ±arcsine (C/D)
If the main axis of the ellipse is at I and III quadrant,
θ must be in the range of
(0~Ï€/2) or (3Ï€/2~2Ï€). If the main axis is at II and IV quadrant,
θ must be in the
range of (Ï€/2~Ï€) or (Ï€~3Ï€/2).
A B
C
D
Signal must be
centered in X
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