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8060
Sinθ = A/B or C/D, where θ = phase shift (in degrees) between the two signals.
From the formula above:
θ = ±arcsine (A/B) or ±arcsine (C/D)
θ must be in the range of (0~π/2) or (3π/2~2π) if the main axis of the ellipse is between
I and III quadrant, . If the main axis is at II and IV quadrant, θ must be in the range of
(π/2~π) or (π~3π/2).
Example 3: The FFT Cursor Measurements
FFT measurement includes: Amplitude measurement (Vrms or dBVrms) and the
Frequency measurement (Hz).
Do these steps as followings:
1. Press the key CURSOR to show Cursor menu.
2.Select Mode->Manual to enter the Manual Cursor Mode window.
3. Select Type->X/Y, select the Cursor Type to X or Y.
3. Select Source->MATH(FFT operation) in the Manual Cursor Mode window.
4. Drag the Cursor to the point of interest.
See the FFT Measurement (Cursor Type Y) in gure 3-3.
Figure 3-3 FFT
Measurement (Cursor Type Y)
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