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Example 5: Application of X-Y Function
Examine the Phase Difference between Signals of two Channels
Example: Test the phase change of the signal after it passes through a circuit network.
Connect the oscilloscope with the circuit and monitor the input and output signals of the circuit.
For the examination of the input and output of the circuit in the form of X-Y coordinate graph, please operate
according to the following steps:
1.
Set the probe menu attenuation coefficient for 10X and that of the switch in the probe for 10X.
2.
Connect the probe of channel 1 to the input of the network and that of Channel 2 to the output of the
network.
3.
Push down the AUTOSET button, with the oscilloscope turning on the signals of the two channels and
displaying them in the screen.
4.
Adjust the VOLTS/DIV knob, making the amplitudes of two signals equal in the rough.
Push down the DISPLAY button and recall the DISP SET menu.
5.
6.
Press the F3 menu selection button and choose XY for Format. The oscilloscope will display the input and
terminal characteristics of the network in the Lissajous graph form.
Adjust the VOLTS/DIV and VERTICAL POSITION knobs, optimizing the wave form.
7.
8.
With the elliptical oscillogram method adopted, observe and calculate the phase difference
(see Fig. 109).
The signal must be centered
and kept in the horizontal
direction.
Fig. 109 Lissajous Graph
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