Hantek DSO4072 User Manual page 70

2. Push the CH1 MENU button and set the Probe option attenuation to 10X; push the CH2
MENU button and set the Probe option attenuation to 10X.
3. Connect the CH1 probe to the input of the network, and connect the CH2 probe to the output.
4. Push the AUTOSET button.
5. Turn the VOLTS/DIV knobs to display approximately the same amplitude signals on each
channel.
6. Push the DISPLAY button to see the Display menu.
7. Push the Format option button and select XY.
8. Now the oscilloscope displays a Lissajous pattern to characterize the input and output of the
circuit.
9. Turn the VOLTS/DIV and VERTICAL POSITION knobs to properly scale the waveform
display.
10. Use the Lissajous's oscillographic method to observe and calculate the phase differences
following the formula below.
As sinθ=A/B or C/D, in which θ is the phase difference angle between channels and A, B, C, D
represent what shown in the figure below, you can get the value of the phase difference angle by
the formula: θ=±arcsin(A/B) or ± arcsin(C/D).
If the principal axes of the ellipse are in the first and third quadrants, the phase difference angle
should be in the first and fourth quadrants, i.e. within (0~π/2) or (3π/2~2π). If the principal axes of
the ellipse are in the second and fourth quadrants, the phase difference angle should be in the
second and third quadrants, i.e. within (π/2~π) or (π-3π/2). See the figure below for better
understanding.
DSO4000 Series Digital Storage Oscilloscope
Signal Horizontal
Centering
B
A
D
C
60