A note on the influence of the averaging time and the frequency resolution on the accuracy of acoustic measurements

This note deals with measurement accuracy in some typical acoustic measurements, measurement of sound pressure and sound intensity in one-third octave bands, and measurement of acoustic transfer functions with a multi-channel FFT analyser. The purpose is to demonstrate by simple examples how the choice of measurement parameters can affect the accuracy of an acoustic measurement, and how the accuracy with a given set of parameters depends on the measurement conditions.