Xy Mode - Rigol DS1000Z Series User Manual

Chapter 3 To Set the Horizontal System

XY Mode

In this mode, the oscilloscope changes the two channels from voltage-time display
mode to voltage-voltage display mode. The phase deviation between two signals
with the same frequency can be easily measured via Lissajous method. The figure
below shows the measurement schematic diagram of the phase deviation.
According to sinθ=A/B or C/D (wherein, θ is the phase deviation angle between
the two channels and the definitions of A, B, C and D are as shown in the figure
above), the phase deviation angle is obtained, that is:
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).
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.
DS1000Z User's Guide
The signal must be
centered horizontally
D
θ=±arcsin (A/B) or ±arcsin (C/D)
II I
II I
B
A
C
III IV
III IV
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