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Sampling Rate
SpectraPLUS-RT allows you to select any Sampling Rate supported by your sound card. The measured frequency range is always 0 to 1/2 the Sampling Rate.
The Sampling Rate determines how many times a second that the analog input signal is "sampled" or digitized by the sound card. A sampling rate of 10,000 Hz will sample the signal every .0001 second. The possible range of sampling rates are limited by the capability of your sound card.
An important principal from digital signal processing is the "Nyquist Sampling Theorem" which states that any signal can be represented if sampled at least twice the rate of the highest frequency of interest. This means that if you wish to measure a 3,000 Hz signal, the sampling rate must be greater than 6,000 Hz.