DSO-3004 USB
Series
Digital Oscilloscope
USER’S MANUAL 66
pattern representing the input and the output characteristics of the circuit.
6. Adjust the scale and offset of the horizontal and vertical to a desirable waveform
display. The following picture shows a typical example.
7. Apply the Ellipse Method to observe the phase difference between the two channels.
Signal in X-Y Format
:
Instruction of the Ellipse Method
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 t
he main axis is at II and IV quadrant, θ must be in the range of (π/2~π)
or (π~3π/2).
