| Hearing Protection Calculator |
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These calculators estimate the sound level at the ear when wearing
hearing protection. The noise must be measured using a suitable
sound level meter and the details of the hearing protectors in
questions must be available too. There are three methods available:
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NRR Method |
The NRR (Noise Reduction Rating) method is usually the least
accurate but easiest way to assess a hearing protector's performance.
You need an "A" or
"C" weighted sound level meter and the
protector's NRR figure. |
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HML Method |
The H-M-L method is usually the second most accurate method.
You need a sound level meter that measures the "A" weighted
and the "C" weighted Sound Level. You also need the
protector's HML values. |
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Octave Band |
This is the most accurate way to calculate the level at the
ear. Use this if you have a sound level meter with Octave Band
Filters. You also need the hearing protector's APV values. |
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