NBN EN ISO 11821:1997现行

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.

NS EN ISO 11821 Ed. 1 (1997) - Identical

UNI EN ISO 11821:1999 - Identical

NF EN ISO 11821:1997 - Identical

I.S. EN ISO 11821:1997 - Identical

ONORM EN ISO 11821:1997 - Identical

DIN EN ISO 11821 (1997-08) - Identical

BS EN ISO 11821:1997 - Identical

NEN EN ISO 11821:1997 - Identical

SN EN ISO 11821:1997 - Identical

SS EN ISO 11821 Ed. 1 (1997) - Identical

UNE EN ISO 11821:1998 - Identical

ISO 11821:1997 - Identical