Rigol DS1000CA series Guía de usuario Pagina 125

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RIGOL
User‟s Guide for DS1000CA Series
3-9
Figure 3-6
Ellipse method to observe the phase difference
Sin = A/B or C/D, where = phase shift (in degrees) between the two signals.
From the formula above, you could get:
= arcsine (A/B) or arcsine (C/D)
If the main axis of the ellipse is at I and III quadrant, must be in the range of
(0~π/2) or (3π/2~2π). If the main axis is at II and IV quadrant, must be in the
range of (π/2~π) or (π~3π/2).
A
B
C
D
Signal must be
centered in X
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