World first!! “0-dB measurement-function”
By employing the original DSP technology, which eliminates the self-noise of themicrophone with preamplifier, the lower limit of measurement has been drastically extendedto lower than 0 dB-SPL. Linearity range, extended to 100 dB in the usual state, furtherexpands to that corresponding to the measurement range 0???80dB(A) by holding the 0-dBfunction in ON position.It enables to measure ultra-low sound pressure level, so displaying its greatest power as inthe quietness measurement of, or tone quality evaluation of, various silent-type IT/OAequipments, as well as in the measurement of air-conditioning noise or sound isolation in aconcert hall with ambient noise below NC-20.