Technical data

24 4000 X-Series Oscilloscopes Advanced Training Guide
2 Oscilloscope Familiarization Labs
You should now see three waveforms on your scope’s display as shown in
Figure 11. The purple waveform is the result of the scope’s math function
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.
12 Press the [Help] front panel key; the press the Training Signals softkey.
13 Press the Phase softkey; then turn the Entry knob to vary the phase
shift. You can also tap the angle value to set it yourself.
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).
14 Press [Default Setup].
15 Press [Help]; then press the Training Signals softkey.
Figure 11 Using waveform math to subtract channel-2 from channel-1.