NF EN ISO 11821:1997现行
Acoustics - Measurement Of The In Situ Sound Attenuation Of A Removable Screen
出版：Association Francaise de Normalisation
专家解读视频
Defines methods for evaluation of the in situ sound attenuation performance of a removable screen, in- or out-of-doors. Based on an insertion loss measurement for carrying out either with shielding of the actual sound source(s) or by means of an artificial sound source.
SN EN ISO 11821:1997 - Identical
NEN EN ISO 11821:1997 - Identical
BS EN ISO 11821:1997 - Identical
DIN EN ISO 11821 (1997-08) - Identical
ONORM EN ISO 11821:1997 - Identical
NBN EN ISO 11821:1997 - Identical
I.S. EN ISO 11821:1997 - Identical
UNI EN ISO 11821:1999 - Identical
NS EN ISO 11821 Ed. 1 (1997) - Identical
SS EN ISO 11821 Ed. 1 (1997) - Identical
UNE EN ISO 11821:1998 - Identical
ISO 11821:1997 - Identical
