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6.
To set the FFT display, follow the steps below:
1.
Push the M/R button;
2.
Set the Operate key (F2) to FFT;
3.
Select the Math FFT Source (F3) channel.
In many situations, the oscilloscope can also generate a useful FFT spectrum despite the YT waveform
not being triggered. This is true if the signal is periodic or random (such as noise).
Note: Trigger and position transient or burst waveforms as close as possible to the screen
center.
Nyquist Frequency
The highest frequency that any real-time digital oscilloscope can measure without errors is half of the
sample rate, which is called the Nyquist frequency. Frequency information beyond the Nyquist
frequency is under sampled which brings about the FFT aliasing. The math function can convert the
center 2048 points of the time-domain waveform to an FFT spectrum. The resulting FFT spectrum
contains 1024 points from DC (0Hz) to the Nyquist frequency. Usually, the screen compresses the FFT
spectrum horizontally to 250 points, but you can use the FFT Zoom function to expand the FFT spectrum
so that you can clearly view the frequency components at each of the 1024 data points in the FFT
spectrum.
Note: The oscilloscope’s vertical response is slightly larger than its bandwidth (60MHz, 100MHz
or 200MHz, depending on the model; or 20MHz when the Bandwidth Limit option is set to
Limited). Therefore, the FFT spectrum can display valid frequency information above the
oscilloscope bandwidth. However, the amplitude information near or above the bandwidth will
not be accurate.
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Summary of Contents for MS6060
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