Getting to know some typical Sound Level Meters
1. Integral sound level meter
For unstable noise, it is required to measure the equivalent continuous sound level Leq of the noise, which is defined as: at a certain point in the sound field, using the method of averaging energy over a certain period of time, several different A sound levels that vary intermittently are represented as one A sound level to represent the size of the noise during that period.
The integral sound level meter can directly display the equivalent continuous sound level of the measured noise within a certain measurement time in digital form. The performance should comply with the requirements of IEC804 and GB/T17181 standards. The schematic diagram is shown in Figure 2, mainly composed of a microphone, preamplifier, frequency weighting amplifier, range conversion, overload indication circuit, logarithmic detection and DC amplification, A/D converter, microprocessor, memory, LCD display, button input panel, reference calibration signal and power supply, interface circuit, etc.
2. Digital sound level meter
Early sound level meters used electricity meters to indicate measurement results, but nowadays, most of them are digital sound level meters. A digital sound level meter is a type of sound level meter that displays measurement results digitally. It not only has the advantages of intuitive and accurate readings, but also can be processed in conjunction with other analytical and processing instruments and computers through BCD code output. The previous integrated sound level meter also belongs to the digital sound level meter, and now we are introducing another model of the digital sound level meter multifunctional sound level meter.
The multifunctional noise analyzer is a pocket intelligent noise measurement instrument that integrates several functions such as integration, noise statistics, and noise acquisition. It has many changes in design and functionality, and can meet various measurement requirements. Its main performance indicators comply with the JJG188-2002 Sound Level Meter Verification Regulations.
