This International Standard is not applicable unless the applications cover the whole frequency range of the reference curve. If only a part of this range is of interest, it may be more appropriate to look for products with a good sound absorption within this range only. The shape indicators described in this International Standard give some guidance in identifying such products which may have a relatively low single number but a much higher potential if a more restricted frequency range is considered. Such products should be judged from the complete sound absorption curve.
BS EN ISO 11670:2003 history
0000 BS EN ISO 11670:2003(2005)
2003BS EN ISO 11670:2003 Lasers and laser-related equipment - Test methods for laser beam parameters - Beam positional stability