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Phase Deviation Measurement

In this mode, you can use the Lissajous method t

o measure the phase deviation of the

two input signals whose frequencies are the same. The following figure shows the

measurement schematic diagram of phase deviation.

Figure 7.5 Measurement Schematic Diagram of Phase Deviation

According t

o sinƟ = A/B or C/D, Ɵ is the phase deviation angle between the two

channels. The definitions of A, B, C, and D are shown in the figure above. The phase

deviation angle is obtained, that is:

Ɵ=±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 2π). 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 (π/2 to

π) or (π to 3π/2).

The XY mode 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.

Acquisition System

DHO1000 User Guide

Rigol DHO1000 Series User Manual

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