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- What are the standards for Sound Level Meter?
In order to make the measurement results of sound level meters produced in various countries in the world comparable with each other, the International Electrotechnical Commission (IEC) has formulated relevant standards for sound level meters and recommended that countries adopt them. In May 1979, the IEC651 "Sound Level Meter" was adopted in Stockholm. Standard, China's national standard for sound level meters is GB3785-83 "Sound Level Meter Electrical and Acoustic Properties and Test Methods".In 1984, IEC passed the IEC804 "Integrated Average Sound Level Meter" international standard, and in 1997 China promulgated GB/T17181-1997 "Integrated Average Sound Level Meter". They are consistent with the main requirements of the IEC standard. In 2002, the International Electrotechnical Commission (IEC) issued a new international standard for IEC61672-2002 "Sound Level Meter". This standard replaces the original IEC651-1979 "Sound Level Meter" and IEC804-1983 "Integrated Average Sound Level Meter".According to this standard, China has formulated the JJG188-2002 "Sound Level Meter" verification regulations. According to the new standard, the sound level meter can be divided into the general sound level meter, integral sound level meter, spectrum sound level meter, etc. according to the purpose, and can be divided into 1 and 2 according to the accuracy. The performance indicators have the same central value, only the tolerance is different, and the tolerance is relaxed as the level number increases.The volume can also be divided into desktop, portable, and pocket sound level meters. According to its indication method, it can be divided into analog indication and digital indication sound level meter.It is used to measure the sound pressure level, and is suitable for detecting near-ear toys, rattles toys, squeezes toys, gunpowder cap toys, other hand-held toys, stationery or self-driven desktop and ground toys, dragging toys, hand-starting clockwork toys, and hands The sound of a rocking toy is loud to prevent excessive sound from damaging the child's hearing.
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