ISO 3382-3-2012 pdf free download.Acoustics – Measurement of room acoustic parameters – Part 3: Open plan offices.
This part of ISO 3382 specifies methods for the measurement of room acoustic properties in open plan offices with furnishing. It specifies measurement procedures, the apparatus needed, the coverage required, the method for evaluating the data, and the presentation of the test report.
The measurement results can be used to evaluate room acoustic properties in open plan offices. This part of ISO 3382 is intended for medium and large size open plan offices.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3382-1. Acoustics — Measurement of room acoustic parameters — Part 1: Performance spaces
ISO 3740, Acoustics — Determination of sound power levels of noise sources — Guidelines for the use of basic standards
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
ISO 14257, Acoustics — Measurement and parametric description of spatial sound distribution curves in workrooms for evaluation of their acoustical performance
ISO 16032, Acoustics — Measurement of sound pressure level from service equipment in buildings — Engineering method
I EC 61672-1, Electroacoustics — Sound level meters — Part 1: Specifications
IEC 61260. Electroacoustics — Octave-band and fractional-octave-band filters
IEC 60268-16:2011, Sound system equipment — Part 16: Objective rating of speech intelligibility by speech
transmission index
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4 Single number quantities
The sound pressure levels and STI shall be measured in octave bands from 125 Hz to 8 000 Hz. STI shall be determined in accordance with the full method specified in IEC 60268-16.
5 Measurement conditions
5.1 Equipment
5.1.1 Sound source. In all measurements an omnidirectional sound source producing pink noise shall be used. Alternatively, it is also possible to use deterministic signals that have a pink spectrum like maximum-length sequence (MLS) or sweeps to measure the impulse response and derive the results from that (see Reference [13]).
An omnidirectional sound source is used since people in an open plan office do not continuously speak in any fixed direction. The requirements given in ISO 3382-1 for the omnidirectional sound source shall be fulfilled for measurements to be in accordance with this part of ISO 3382. Verification of the sound power of the source is performed as in ISO 3382-1, with the sound source positioned at the height of 1,2 m.
5.1.2 MIcrophone. Sound pressure levels in each octave band and at each microphone position shall be measured using a sound level meter meeting the requirements of IEC 61672-1, class 1. The microphone shall be omnidirectional (taking into account any supplementary equipment connected to it). Octave-band filters shall comply with IEC 61260.
If the signal is recorded (e.g. by using analogue or digital recorders) for off-line processing, it shall be ensured that the instrumentation as a whole complies with the above-mentioned requirements.
5.2 Measurement procedure
5.2.1 Measurement conditions
Measurements in accordance with this part of ISO 3382 shall be made in furnished rooms, but without the presence of people, except the persons needed to carry out the measurements.
The background noise level is measured and applied for the determination of the STI value. The HVAC devices and other noise sources shall operate on the same power as during typical working hours. If the sources operate at reduced power, the STI values are too high, leading to overestimation of rj and rp. If the office is equipped with a sound-masking system. it shall be switched on during the measurement.
Measurements in accordance with this part of ISO 3382 have to be carried out when people are absent. Thus the noise from people talking in the room is not included in the measured background noise level. It is recognized that noise from people talking in the open plan office can sometimes cause a positive masking effect (see Reference (10]). In such cases, the actual distraction distance and privacy distance are shorter than the measured r and rp, respectively. The evaluation of the acoustic conditions with people talking is not within the scope of this part of ISO 3382.ISO 3382-3 pdf free download.
Tags: Acoustics
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