User Guide

RIGOL 3 To Set the Horizontal System
DS2000 User’s Guide
3-6
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 and enable X-Y mode. Rotate Horizontal
SCALE to ajdut the
sample rate properly to get better Lissajous figure for better observation and
measurement.
3. Roate VERTICAL POSITION of CH1 and CH2 to display the signals at the
center of the screen and roate 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 displayed.
4. As shown in the figure above, the distances from the crossing points of axis and
the circle to the origin of the coordinates are approximately equal. Thus, the
phase deviation angle
θ=±arcsin1=90°.