British Standards Document
BS EN ISO 3744
Acoustics. Determination of sound power levels and sound energy levels of noise sources using sound pressure. Engineering methods for an essentially free field over a reflecting plane

https://doi.org/10.3403/30094843U

BS EN ISO 3744 is maintained by EH/1/4. The current release of this standard is:

BS EN ISO 3744:2010 Acoustics. Determination of sound power levels and sound energy levels of noise sources using sound pressure. Engineering methods for an essentially free field over a reflecting plane

https://doi.org/10.3403/30094843 (published 31/01/2011)

This standard is available from the following sources:

Other historical versions of this standard document also exist:

BS EN ISO 3744:2009 [current until 31/01/2011]
BS EN ISO 3744:1995 [current until 30/04/2010]