Promax OD-603 Manual page 93

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:
Set the probe menu attenuation coefficient for 10X and that of the
switch in the probe for 10X.
Connect the probe of channel 1 to the input of the network and that of
Channel 2 to the output of the network.
Push down the Autoset button, with the oscilloscope turning on the
signals of the two channels and displaying them in the screen.
Turn the VOLTS/DIV knob, making the amplitudes of two signals
equal in the rough.
Press the Display button and recall the Display menu.
Press the H3 button and choose XY Mode as ON.
The oscilloscope will display the input and terminal characteristics of
the network in the Lissajous graph form.
Turn the VOLTS/DIV and VERTICAL POSITION knobs, optimizing
the waveform.
With the elliptical oscillogram method adopted, observe and calculate
the phase difference (see Figure 85).
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The signal must be
centered and kept in
the horizontal
Figure 85. Lissajous Graph.
June 2016