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EN 352-7:2002
Hearing protectors. General requirements Part 7: Level-dependent ear-plugs

This standard requires all of the testing specified in EN 352-2 with the additional clause below tested on additional samples.

Criterion levels

The sound restoration level of the device is measured using microphones housed within an acoustic test fixture, this sound restoration level is added to the passive attenuation values measured previously to give a relationship between external sound pressure level and the level at the ear.