Tektronix TDS2000C series, Manual

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TDS2000C Series Oscilloscope www.tektronix.com/tds2000
14
Look for Unintentional Circuit Noise
Developers need to check for unintended noise in their prototypes.
However, noisy signals can be difficult to analyze in the time domain,
as shown below.
Engineers and technicians can use the Fast Fourier Transform
(FFT) to break 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 graph.
Developers can then associate those frequencies with known
system frequencies, such as system clocks, oscillators, read/write
strobes, display signals, or switching power supplies.