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ISO/TR 4869-3:1989
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
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Acoustics Hearing protectors Part 3: Simplified method for the measurement of insertion loss of ear-muff type protectors for quality inspection purposes
Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users
18-02-2019
English, French
30-11-1989
The procedure specified may be used to investigate production spreads of performance as part of type approval or certification procedures and the change of performance with age. It is not intended to be used as the basic test for type approval purposes. Performance data obtained are not to be quoted as representing the real-ear sound attenuation of an ear-muff, nor the protection provided by the ear-muff.
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