RIGOL DS6000 Series - Manual (Page 76)

RIGOL 3 To Set the Horizontal System
DS6000 User’s Guide 3-6
X-Y function can be used to measure the phase deviation occurred when the test
signal passes through a circuit network. Connect the oscilloscope to the circuit to
monitor the input and output signals of the circuit.
Application example:
Measure the phase deviation of the input signals of two channels.
Method 1: Use Lissajous method
1. Connect a sine signal to CH1 and then connect a sine signal with the same
frequency and amplitude but a 90° phase deviation to CH2.
2. Press Auto, turn on the X-Y mode and rotate HORIZONTAL SCALE to
adjust the sample rate properly to get a better Lissajous figure for better
observation and measurement.
3. Adjust VERTICAL POSITION of CH1 and CH2 to display the signals at the
center of the coordinate region and adjust VERTICAL SCALE of CH1 and
CH2 to make the signals easy to observe. At this point, the circle as shown in the
figure below should be got.
4. From the figure above, the distances from the points of intersection of the X/Y
axis and the circle to the origin of the coordinates are approximately equal. Thus,
the phase deviation angle θ=±arcsin1=90°.