54 Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide
2 Horizontal Controls
Example This exercise shows a common use of the XY display mode by measuring the
phase difference between two signals of the same frequency with the Lissajous
method.
1 Connect a sine wave signal to channel 1, and a sine wave signal of the same
frequency but out of phase to channel 2.
2 Press the [AutoScale] key, press the [Horiz] key; then, press Time Mode and select
"XY".
3 Center the signal on the display with the channel 1 and 2 position ( ) knobs.
Use the channel 1 and 2 volts/div knobs and the channel 1 and 2 Fine softkeys
to expand the signal for convenient viewing.
The phase difference angle (θ) can be calculated using the following formula
(assuming the amplitude is the same on both channels):
4 Press the [Cursors] key.
5 Set the Y2 cursor to the top of the signal, and set Y1 to the bottom of the
signal.
Note the ΔY value at the bottom of the display. In this example, we are using
the Y cursors, but you could have used the X cursors instead.
Figure 3 XY time mode signals, centered on display
A
B
D
C
Signal must
be centered i n
“X”
Measuring
phase difference
Signals 90 degrees
out of phase
Signals
in phase
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