Rigol DS1074B User's Guide download pdf (Page 145)

RIGOL

User’s Guide for DS1000E, DS1000D 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).

Signal must be

centered in X

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Rigol DS1074B User's Guide Page 145