Rigol DS1104B Guia do Utilizador descarregar pdf (Página 145)

RIGOL

User’s Guide for DS1000B 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)

 must be in the range of (0~π/2) or (3π/2~2π) if the main axis of the ellipse is at I

and III quadrant, 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 DS1104B Guia do Utilizador Página 145