User Manual

55
Figure 38 - Eres mode
4.7 Horizontal Format
To choose the horizontal format, press the Acquire button. Pressing the XY softkey toggles between
XY and YT mode. The default mode is YT.
YT: This is the normal viewing mode for the oscilloscope and displays the channel's voltage or
current as a function of time.
XY: This is a scatter plot of channel 1's samples versus channel 2's samples. An example use is in
curve tracing, where a component's current is plotted vertically against the voltage across the
component in the horizontal direction. Look up "Octopus tester" on the web for more details.
XY mode can be used to compare frequency and phase relationships between two periodic
signals that are changing in time. It is used with transducers to display strain versus displacement,
flow versus pressure, voltage versus frequency, etc.
The phase deviation between two sinusoidal signals with the same frequency can be measured
via the Lissajous method and the XY display of the oscilloscope. The figure below shows the
measurement schematic diagram of the phase deviation: