Kenwood CS-5200 Series - A P P L I C a T I O N S of X-Y O P E R a T I O

8-13 Appl i cat i ons of X-Y Operat i on
When operating the oscilloscope in the X-Y mode, Lissajous patterns can be displayed.
With Lissajous patterns, it is possible to find even the slightest phase difference or
signal distortion and relative frequency proportions.
1) Apply the signal to be measured to the CHI INPUT terminal. Apply the reference signal
to the CH2 INPUT terminal.
2) Set the H. MODE control to X-Y.
3) Adjust the VOLTS/DIV and V. VARI controls of both channels to obtain an acceptable
display.
4) In phase difference measurement with Lissajous patterns, measured values wi11 not
change by turning the V. VARI control. Use an easy-to-see display for measurement.
Figure 21 Measuring Phase Difference with Lissajous Patterns
The following represent Lissajous patterns indicating the presence of signal distortion or
phase difference.
Figure 22 Typical Lissajous Patterns
48
. B
<f> = sm —
or
B
sin</> = —
A
where </> is the phase difference
Amplitude distortion, no
phase discrepancy
No amplitude distortion,
no phase discrepancy
No amplitude distortion,
180° phase discrepancy
Amplitude distortion,
phase discrepancy
No amplitude distortion,
90° phase discrepancy
No amplitude distortion,
phase discrepancy