ISO 10052-2021 pdf free download – Acoustics — Field measurements of airborne and impact sound insulation and of service equipment sound — Survey method.
5Instrumentation
The measuring service equipment shall comply with the requirements of Clause 6.
The sound source for measuring sound insulation between rooms shall be as omnidirectional aspracticable. In facade measurement, the opening angle shall cover the whole facade. The directivityof the sound source and the distance to the facade shall be such that the variations between pressurelevels measured in front of the facade, for each frequency band of interest, are less than 5 dB.
The tapping machine shall comply with the requirements given in IS0 10140-5:2021，Annex E andISO 16283-2:2020，Annex A. The heavy/soft impact source – rubber ball shall comply with therequirements given in ISO 10140-5:2021,Annex F and IS0 16283-2:2020,Annex A.
The accuracy of the sound pressure level measurement equipment shall comply with the requirementsof accuracy classes 1 or 2 defined in IEC 61672-1.The complete measuring system including themicrophone shall be adjusted before each measurement to enable absolute values of sound pressurelevels to be obtained.
For all measurements diffuse field microphones are required. For sound level meters with free fieldmicrophones corrections for accounting the diffuse sound field shall be applied.
Filters shall comply with the requirements defined in IEC 61260.
NOTE For pattern evaluation (type testing) and regular verification tests recommended procedures forsound level meters are given in OIML R58 and R88.
6Test procedure and evaluation6.1General
The measurements of airborne sound insulation and of impact sound insulation are made in octavebands. The measurements of service equipment sound pressure levels are made in A-weighted orC-weighted sound pressure levels. The measurements shall be performed with doors and windowsclosed and shutters normally open.Operating cycles and operating conditions for measuring of serviceequipment noise shall be given in AnnexB.They should only be used if they are not opposed to nationalrequirements and regulations.
6.2Generation of sound field6.2.1 General
lf the difference between the signal level and the background noise level is less than 6 dB, the measuredsignal level shall be recorded in the report. A note shall be added to say that the measured receivingroom level was affected by background noise and the corresponding level difference has beenunderestimated or that the measurement level (service equipment) has been overestimated by anunknown amount.
No correction for background noise shall be applied.
For measurements of the airborne sound insulation between rooms and the airborne sound insulationof facades using the loudspeaker method, the sound power of the source should be adjusted so that thesound pressure level in the receiving room (in each frequency band) is at least 6 dB higher than thebackground noise level. This shall be checked by switching the source on and off before starting themeasurement.
When measuring the airborne sound insulation of facades by the traffic sound method, the backgroundnoise level in the receiving room cannot easily be assessed.Because of this,steps should be takento ensure that the noise level in the receiving room due to sources within the building is as low aspracticable.Excessive background noise from internal sources will lead to an underestimate of thefacade insulation.A comment shall be made in the report if this is thought to have occurred.
6.2.2Airborne sound insulation between rooms
The sound generated in the source room shall be steady and have a continuous spectrum in thefrequency range considered.Filters with a bandwidth of one octave may be used.When using broad-band noise, the spectrum of the sound source may be shaped to ensure an adequate signal-to-noiseratio at high frequencies in the receiving room.
lf the sound source enclosure contains more than one loudspeaker operating simultaneously, theloudspeakers shall be driven in phase.Multiple sound sources may be used simultaneously providingthey are of the same type and are driven at the same level by similar, but uncorrelated, signals.
Place the sound source in a corner of the room opposite the separating element.The distance from thewalls shall be at least 0,5 m. If the source is a single loudspeaker system it should be placed facing thecorner.
When testing rooms in a vertical direction, use the lower room as the source room.When testing roomsof unequal size in a horizontal direction, use the larger room as the source room unless it has beenpreviously agreed that the test should be in the other direction.
6.2.3 Impact sound insulation between rooms
The impact sound shall be generated by the standard tapping machine and/or rubber ball (seeISo 10140-5 and lS0 16283-2). The standard impact sound sources; tapping machine and rubberball, shall be placed in the source room near the centre of the floor (in case of tapping machine on thediagonal direction).This single position is sufficient if the floor and slab are isotropic.
NOTE ln complex cases,see numerous examples of room arrangements and measurement positions inISO 16283-2:2020,Annex E.
In the case of anisotropic floor constructions (with ribs, beams, etc.) add two positions so that thethree positions are randomly distributed over the floor area. The hammer connecting line shouldbe orientated at 450 to the direction of the beams or ribs. In these cases, the distance of the tappingmachine from the edges of the floor shall be at least 0,5 m.ISO 10052 pdf download.