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2
Oscilloscope Familiarization Labs
Figure 11 Using waveform math to subtract channel-2 from channel-1.
You should now see three waveforms on your scope's display as shown in
Figure
of subtracting the channel- 2 waveform from the channel- 1 waveform.
Note that to change the scaling of the math waveform, you can use the
knobs on the right- hand side of the scope's front panel near the [Math]
key.
Let's now vary the phase shift of the two sine waves and observe the
results.
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When the phase shift is exactly 180 degrees, the resultant math waveform
will be at its highest amplitude as expected. When the phase shift is
exactly 0 or 360 degrees, the resultant math waveform flat- lines (0.0 V).
Let's now perform a more complex math function; FFT (Fast Fourier
Transform).
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11. The purple waveform is the result of the scope's math function
Press the [Help] front panel key; the press the Training Signals softkey.
Press the Phase softkey; then turn the Entry knob to vary the phase
shift.
Press [Default Setup].
Press [Help]; then press the Training Signals softkey.
Select the Clock with Infrequent Glitch signal using the Entry knob; then
press the Output softkey to turn it on.
Set channel- 1's V/div setting to 500 mV/div.
2000 X-Series Oscilloscopes Advanced Training Guide
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