Basic FAQ for FFT Analyzer

In normal FFT processing, the storage of digital data into buffer memory and the FFT computation are performed in parallel. In spectral averaging processing, when the FFT processing time is less than the FFT time window length T, that is, performing FFT computation without missing instantaneous time series data is called real-time analysis, and the maximum possible (highest) frequency range for this is referred to as real-time frequency range.

For example, in the case of the DS-2104A analyzer, at a 40 kHz range with 800 line analysis, the time window length is 20 ms. The DS-2104A analyzer processes 4-channel spectral averaging in approximately 20 ms, which means the real-time frequency range is 40 kHz (4 channels, 800 lines).

	Real-time analysis (FFT basic terminology)