sound level meter Frequently Asked Questions

It is believed that there is a significant sound at frequencies higher than 14.03 kHz.

In the case of octave analysis, the upper limit of the center frequency 12.5 kHz band, which is the maximum analysis band, is up to 14.03 kHz. On the other hand, the microphone sensitivity can be measured up to 20 kHz. Therefore, the noise level display measures and shows the noise level in the frequency range of the microphone sensitivity from 20 Hz to 20 kHz.
Note that when octave analysis is performed, the value displayed simultaneously for ALLPASS 1 (see figure below) shows the same value as the noise level.

supplementary explanation

When connecting the AC output of the LA-5111 and LA-5110 sound level meters to an FFT analyzer for noise analysis, it is possible to perform analysis in the range of 20 Hz to 20 kHz. The LA-5111 and LA-5110 have been discontinued, and the successor model LA-5560 is now being sold. The octave analysis of the LA-5560 allows for analysis display up to the center frequency 20 kHz band (with an upper frequency of 22.4 kHz).