42
Keysight InfiniiVision 1200 X-Series and EDUX1052A/G 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
[Auto Scale]
key, press the
[Acquire]
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
Δ
Y 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 7
XY time mode signals, centered on display
sin
θ
=
A
Bor
C
D
A
B
D
C
Signal must
be centered in
“ X”
Measuring
phase difference
Signals 90 degrees
out of phase
Signals
in phase
