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.

§  It can measure with 1/1 and 1/3 octave bands to measure noise levels at individual frequencies to analyze fluctuations of sound level with more clarity. Automatic frequency sweep function allows to automatically measure sound levels at various frequencies.

§  Integrating mode allows for data measurement of either 800 groups (with custom time intervals) or 6 days of data(taken hourly). This data is stored with statistics of each group, like percentiles, max, std deviation, etc.

§  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

§  Power source via battery or external power supply

§  Optional data logging and printer accessories

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.