84 Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide
4 Math Waveforms
FFT Units
0 dBV is the amplitude of a 1 Vrms sinusoid. When the FFT source is channel 1 or
channel 2 (or channel 3 or 4 on 4-channel models), FFT units will be displayed in
dBV when channel units is set to Volts and channel impedance is set to 1 MΩ.
FFT units will be displayed in dBm when channel units is set to Volts and channel
impedance is set to 50Ω.
FFT units will be displayed as dB for all other FFT sources or when a source
channel's units has been set to Amps.
FFT DC Value
The FFT computation produces a DC value that is incorrect. It does not take the
offset at center screen into account. The DC value is not corrected in order to
accurately represent frequency components near DC.
FFT Aliasing
When using FFTs, it is important to be aware of frequency aliasing. This requires
that the operator have some knowledge as to what the frequency domain should
contain, and also consider the sampling rate, frequency span, and oscilloscope
vertical bandwidth when making FFT measurements. The FFT resolution (the
quotient of the sampling rate and the number of FFT points) is displayed directly
above the softkeys when the FFT Menu is displayed.
Aliasing happens when there are frequency components in the signal higher than
half the sample rate. Because the FFT spectrum is limited by this frequency, any
higher components are displayed at a lower (aliased) frequency.
Nyquist Frequency and Aliasing in the Frequency Domain
The Nyquist frequency is the highest frequency that any real-time digitizing oscilloscope can
acquire without aliasing. This frequency is half of the sample rate. Frequencies above the
Nyquist frequency will be under sampled, which causes aliasing. The Nyquist frequency is also
called the folding frequency because aliased frequency components fold back from that
frequency when viewing the frequency domain.
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