专家解读视频
Describes instruments (sound level meters) for the measurement of certain frequency and time weighted sound pressure levels. Gives the following characteristics of sound level meters: - directional characteristics; - frequency weighting characteristics; - time weighting, detector and indicator characteristics; - sensitivity to various environments.
Supersedes NBN C 97 122 (10/2003)
NF EN 60651:1994 - Identical
SN EN 60651:1994 - Identical
DIN EN 60651 (1994-05) - Identical
BS EN 60651:1994 - Identical
I.S. EN 60651:1994 - Identical
UNE EN 60651:1996 - Identical
SS EN 60651:1996 - Identical
