Scope
ISO 3747:2010
Sound Power Level — In-Situ Reference Source Method
This engineering/survey method determines sound power levels using a calibrated reference sound source to account for acoustic environmental conditions during in-situ measurements. It is particularly useful for large or immobile equipment where laboratory testing is impractical, and for on-site verification of noise compliance. The reference source approach compensates for acoustic environmental effects, improving accuracy compared to basic survey methods. Accreditation ensures proper reference source maintenance and measurement protocols are followed. This method is essential for field acceptance testing and environmental noise assessments.
What it measures
- Sound power level (Lw) referenced to 1 pW
- A-weighted and frequency-weighted sound power
- Environmental acoustic correction factors
- In-situ acoustic performance
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DIN EN ISO 3746
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BS EN ISO 3746
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NF EN ISO 3746
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UNI EN ISO 3746
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UNE EN ISO 3746
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NEN EN ISO 3746
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DIN EN ISO 9614-1
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BS EN ISO 9614-1
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NF EN ISO 9614-1
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UNI EN ISO 9614-1
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UNE EN ISO 9614-1
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NEN EN ISO 9614-1
1,670
Accredited labs
18
Countries
Showing 301–325 of 349 labs
ISO 7171
ISO 1407
BS EN ISO 140-4:1998
BS EN ISO 717-2:2020
Stroma Built Environment
Active
DIN EN 12094-8
BS EN ISO 717-2:2020
DIN EN 950
BS EN ISO 10077-2:2017
ISO 16000-3
+ 3 more
Surrey County Council
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DIN EN 933-11
DIN EN 1097-6
DIN EN 1097-1
DIN EN 1097-2
DIN EN 933-3
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ISO 6529
DIN EN 13744
DIN EN 16523-1
EN 16523-2
ASTM F739-12e1( withdrawn)
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Testo Industrial Services
Active
RELATIVE HUMIDITY
HUMIDITY continued
loggers
Gas Pressure Gauge
Saturated salt capsules
+ 2 more
Tetra Tech Consulting
Active
(HSG 248) – 2021
RPSCA1 based on HSG 248
(PCM) based on HSG 248
RPSCA2 based on HSG 248
BS 7592:2008, BS 8554:2015
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(HSG 248) – 2021
03 based on HSG 248)
QOP01 based on HSG 248
(PCM) based on HSG 248
The Testing Lab
Active
DIN EN 933-11
BS EN ISO 17892-1:2014+A1:2022
BS EN ISO 17892-10:2018
BS EN ISO 17892-11:2019
BS EN ISO 17892-2:2014
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Thomas Dudley
Active
BS 1212-2:1990 Clause 4
BS 1212-3:1990 Clause 4
DIN EN 997
Laktoseintoleranz (LCT -14055
BS 1212-4:1991 Clause 4, 13, 14
Total Clean Air
Active
ISO 14644-3
BS EN ISO 14644-2:2015:Part 2
DIN EN 12469
BS EN ISO 14644-1:2015
BS EN ISO 14644-4:2022
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Tru-Cal Metrology
Active
including dial and digital
LENGTH (cont’d)
Plain plug gauges (taper)
ANCILLARY MEASUREMENTS
Plain ring gauges (taper)
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Tyneside Standards
Active
Micrometers
See Notes 3 and 5
See Note 6
Caliper
length bars) – See Note 5
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