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Figure 7.1 Measurement Schematic Diagram of Phase Deviation
According to sinθ=A/B or C/D, θ is the phase deviation angle between the two
channels. The definitions of A, B, C, and D are shown in the above figure. The phase
deviation angle is obtained, that is:
θ=±arcsin(A/B) or ±arcsin(C/D)
If the principal axis of the ellipse is within Quadrant I and III, the phase deviation
angle obtained should be within Quadrant I and IV, namely within (0 to π/2) or (3π/2
to 2Ï€). If the principal axis of the ellipse is within Quadrant II and IV, the phase
deviation angle obtained should be within Quadrant II and III, namely within (Ï€/2 to
Ï€) or (Ï€ to 3Ï€/2).
The XY function can be used to measure the phase deviation occurred when the
signal under test passes through a circuit network. Connect the oscilloscope to the
circuit to monitor the input and output signals of the circuit.
Application example: measures the phase deviation between the input signals of two
channels.
Use Lissajous method
1. Connect one sine signal to CH1, and then connect another sine signal (with the
same frequency and amplitude as the previous one but a 90° phase deviation from
the previous one) to CH2.
To Set the Sample System
66
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