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To properly measure a sinusoid, you need a minimum number of cycles. For example, you need 5 cycles to get an accurate result with an FFT+Hanning weighting.
On the other hand, in presence of noise (which is the practical case), you need a min duration of measurement to get a reliable result. Technically speaking, the variance of the sine level measured in presence of noise, is inversely...

The goal of the Equalization is to compensate the frequency response of the output transducer (e.g artificial mouth) as to get an (almost) flat spectrum at the input of the DUT (e.g. artificial ear).
When Equalization is applied, each step level of a stweep is multiplied by a gain function of frequency.
That gain function is found in the memory list as the calibration eq-out curve for...