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6.5 Example 5: Using X-Y Mode
Viewing Phase Differences between Two Channel Signals
For example, you need to measure the change in a phase across a circuit network.
Connect the oscilloscope with circuitry and view the input and output of the circuit in XY mode.
Follow the steps below.
1.
First, prepare two oscilloscope probes and set the switches to 10X on both probes.
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 AUTO button.
5.
Click the VOLTS keys to display approximately the same amplitude signals on each channel.
6.
Enter the Display menu.
7.
Push the DSO Mode button and select XY.
8.
Now the oscilloscope displays a Lissajous pattern to characterize the input and output of the
circuit.
9.
Click the VOLTS and Vertical Position keys 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
DSO1000E Series HandHeld Oscilloscope User Manual
Application Examples
48
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