National Standard TCVN 7839-2:2007 - acoustics - determination of sound insulation performance of enclosures - part 2: measurements in situ (for acceptance and verification purposes)

This standard specifies the in-situ measurement method to determine the sound insulation (sound reduction) efficiency of acoustic enclosures.

This standard does not apply to individual components making up the acoustic enclosure, but only to the complete acoustic enclosure.

NOTE

1. The sound insulation of individual enclosure components such as walls, doors, windows, silencers, etc., shall be measured in accordance with other relevant standards.

2. Standards related to the measurement of noise reduction of acoustic enclosures under laboratory conditions (TCVN 7839-1 (ISO 11546-1)) and in cabins (ISO 11957).

The measurement methods specified in this standard are based on ISO 3740, ISO 9614, and ISO 11200 (see Table 1). Depending on the selected method, the sound insulation (sound reduction) efficiency of the acoustic enclosure is determined by the reduction of the sound power level or sound pressure level. This method is intended for measurement at locations where the acoustic enclosure surrounds an actual sound source (machinery). When these methods cannot be implemented, alternative methods such as using an artificial sound source may be used. These methods are also described in this standard.