Ever wondered what the difference is between a Class 1 and Class 2 Decibel Meter? The standards that we work to, such as IEC 61672-1:2002 or BS EN 61672-1:2003, define a wide range of performance criteria that the instrument must meet. These criteria are often quite technically complex and detailed and have tolerances associated with them. In the current standard, IEC 61672-1:2002, there are two levels of tolerance and these are known as Class 1 and Class 2..
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