Analyze Wavefor
mData
2. Push Dual Wfm Math.
Dual Wfm
Math
FFT Advanced
Math
(M) Label
3. Onthesideme
nu, set the sources to either
channel 1, 2, 3, 4, or reference waveforms
R1, 2, 3,or4. Choose the +, –, x,or÷
operators.
4. For example, you might calculate power
by multiplying a voltage waveform and a
current wa
veform.
Quick Tips
Math wa
veforms can be created from channel or reference waveforms or a combination of them.
Measur
ements can be taken on math waveforms in the same way as on channel waveforms.
Math w
aveforms derive their horizontal scale and position from the sources in their math expressions. Adjusting these
controls for the source waveforms also adjusts the math waveform.
You can zoom in on math waveforms using the inner knob of the Pan-Zoom control. Use the outer knob for positioning
the zoomed area. (See page 127, Using Wave Inspector to Manage Long Record Length Waveforms.)
Usin
g FFT
An FFT breaks down signals into component frequencies, which the oscilloscope uses to display a graph of the frequency
domain of a signal, as opposed to the oscilloscope's standard time domain g raph. You can match these frequencies with
known system frequencies, such as system clocks, oscillators, or power supplies.
1. Push Math.
MSO4000B and DP O4000B Series Oscilloscopes User Manual 121
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