RIGOL
© 2008 RIGOL Technologies, Inc.
User’s Guide for DS1000E, DS1000D Series
3-9
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~
π
/2) or (3
π
/2~2
π
). If the main axis is at
II
and
IV
quadrant,
θ
must be in the
range of
(
π
/2~
π
) or (
π
~3
π
/2).
A
B
C
D
Signal must be
centered in X
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