Sound Level Meter Product Introduction: The Aihua AWA5661 sound level meter is a modular and multifunctional sound level meter that complies with the requirements of GB/T 3785.1-2010 and IEC 61672-1:2013 standards for level 1 sound level meters. It is classified as X class in terms of sensitivity to radio frequency fields.

Product use: It is suitable for environmental protection, labor health, industrial enterprises, scientific research and teaching fields. It is used for environmental noise measurement, machinery and equipment noise measurement, airport noise measurement, sound power level measurement and architectural acoustics measurement.

Product structure: Composed of a capacitive microphone, preamplifier, attenuator, amplifier, frequency weighting network, and effective value indicator head.

Working principle: The microphone converts sound into electrical signals, and then the preamplifier transforms impedance to match the microphone with the attenuator. The amplifier adds the output signal to the weighting network, performs frequency weighting (or external filter) on the signal, and then amplifies the signal to a certain amplitude through an attenuator and amplifier, and sends it to the effective value detector (or external level recorder). The noise level value is given on the indicator head.