CADNAA TUTORIAL FULL
‘A’ Weighted is the most commonly used and covers the full frequency range of 20Hz all the way up to high frequency 20 kHz. It is defined in various International standards such as the IEC 61672, as well as in various national standards such as ANSI S1.4. A sound level meter weighting that makes its readings conform to a notional human hearing response. What are 'A', 'C' and 'Z' weightingsĪ-weighting – (A-frequency-weighting). The three most commonly used decibel weightings are 'A', 'C' and 'Z' as defined in the sound level meter standards IEC 61672:2013 (BS EN 61672-1:2013), but which one do you choose? We explain this is more detail below, but if you own one of our Pulsar Nova sound level meters which measures all of these frequencies simultaneously, you need not ever worry about picking the wrong weighting. You may have noticed that some sound meters allow you to choose the frequency weighting you want to measure noise at. This is because picking the wrong sound level meter weighting on your sound level pressure meter could mean your results become irrelevant for the purpose and at worst invalid (not legally compliant). Understanding the difference between noise frequency weightings is one of the most important things you need to know about when measuring sound. What are the different frequency weightings and why do you need to know?
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