Year made:1996
Manufacturer: Brüel & Kjær
Manufacturing place (country): Denmark
Function / Purpose:
Rectangular equipment: length, width and height of 21 × 20 × 13 (cm); conical equipment: diameter of 24 cm, height of 35 cm.
Specifications: 0 dB ~ 75 dB, 100 Hz ~ 10l Hz.
It can provide correction calculation of background noise, fixed sound pressure under fixed frequency, and then provide environmental reference.

Characteristics:
The principle combines electronics, circuit science, electromagnetics, materials science, mechanical vibration, acoustics, etc.

Source:Metal Industries Research & Development Centre (MIDC)

Inspection