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5-13
Making Measurements
To use the XY horizontal mode
To use the XY horizontal mode
The XY horizontal mode converts the oscilloscope from a volts-versus-time
display to a volts-versus-volts display using two input channels. Channel 1 is
the X-axis input, channel 2 is the Y-axis input. You can use various transducers
so th e d is pl ay cou ld sh ow st ra in ve rs us d is place me nt , f lo w v er su s p re ss ur e, volts
versus current, or voltage versus frequency. 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.
2Press the
Autoscale key, press the Main/Delayed key, then press the XY
softkey.
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
Vernier 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):
Example of centering a signal on the display
θsin
A
B
---
or
C
D
----
=
A
B
D
C
Signal must
be centered
in “X”