Features:

§  This has performance in accordance with GB/T 3785-2010 standard level 2, IEC 61672:2013 Class 2 and JJG 188-2017 sound level requirement standards.

§  Fast, slow and Impulse time weight mode. Impulse mode can measure sharp, short impulse sound levels like gunshots, fireworks, etc.

§  Exponential time weighted sound level with A, C and Linear frequency weightings

§  Backlit display, dynamic scale graph with range selection for better accuracy

§  AC output port

§  Battery or external power supply

Applications:

This is a highly accurate sound level meter, calibrated using class 1 sound level calibrator. It is useful for sound level and noise level monitoring in occupational health and safety, environmental monitoring, building acoustics, healthcare, noise pollution studies, machinery noise analysis, etc.     

Measuring Principle:

Sound is a phenomenon caused by fluctuations in air pressure. Even at same amount of pressure fluctuations, we, humans do not feel they are the same at different frequencies. Hence, to evaluate the loudness as perceived by human ear, it is important to consider auditory sensations and its characteristics.

This sound level meter uses a microphone sensor, which has a diaphragm (with coil and magnet) sensitive to sound pressure fluctuations. It converts these fluctuations to electrical signals which are further filtered digitally to display the sound pressure in decibels(dB) values, a common unit for sound loudness measurement. These digital filters are where the magic happens, where the sound pressure is weighted with time, frequency, octave bands, etc. to display appropriate values.