Chapter 3 Horizontal System
25
XY——XY Mode
The vertical amount of CH1 is displayed on the horizontal axis in XY mode, and the vertical amount of CH2 is
displayed on the vertical axis (see Figure 3-8 XY Mode).
You can use XY mode to compare the frequency and phase relationship of two signals.
XY mode can be used for sensors to display stress-displacement, flow-pressure, voltage-frequency or voltage-
current, for example: plotting a diode curve.
You can also use the cursor to measure the waveform in XY mode.
Figure 3-8 XY Mode
XY Mode Example
This exercise shows the usual practice of XY display mode by measuring the phase difference between two
signals of the same frequency using the Lissajous method.
1)
Connect sine wave signals to CH1 and connect sine wave signals of the same frequency and different phases
to CH2.
2)
Press “Auto” set button, tap “Display” in the main menu, then select “XY” in “Time Base”.
3)
Drag signals so that they are centered on the display screen. Adjust the vertical sensitivity of CH1 and CH2,
and extend signals for viewing.
The phase difference (θ) can be calculated using the following formula (assuming that the amplitudes of the
two channels are the same):