sound level meter Frequently Asked Questions

Output voltage at the upper limit value of the bar indicator: UPPER_V

dB change rate per 1V: FACTOR (dB/V)

Output voltage: assuming DC.

Sound Level (dB) = FACTOR x (DC - UPPER_V) + UPPER_dB

example

Level range display upper limit value UPPER_dB = 90 dB

Output voltage UPPER_V at the upper limit of the level range = 2.5 V

At 10 dB with a voltage of 0.25 V, the dB change factor is 40 dB.

When the DC output voltage is 1.0 V,

Sound Level (dB) = 40x (1.0 - 2.5) + 90 = 30 dB