Scope
ISO 3746:2010
Sound Power Level — Survey Method
This test determines sound power levels of noise sources using an enveloping measurement surface and sound pressure level measurements. It is a survey-grade method suitable for field measurements of machinery, equipment, and industrial sources in moderately reflective environments. The method is widely used for noise compliance verification, product development, and environmental impact assessments. Accredited testing ensures consistent, defensible results for regulatory compliance and product labeling. This method bridges the gap between laboratory-grade precision and practical field measurements.
What it measures
- Sound power level (Lw) in decibels
- A-weighted and frequency-weighted sound power
- Directional sound power distribution
- Acoustic performance of noise sources
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DIN EN ISO 3744
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BS EN ISO 3744
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NF EN ISO 3744
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UNI EN ISO 3744
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UNE EN ISO 3744
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NEN EN ISO 3744
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DIN EN ISO 3745
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BS EN ISO 3745
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NF EN ISO 3745
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UNI EN ISO 3745
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UNE EN ISO 3745
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NEN EN ISO 3745
1,868
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tungsten carbide)
Plain ring gauges (taper)
Straight edges
LENGTH (cont’d)
Squares
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Micro Precision (Midlands)
Active
LENGTH
Caliper
Depth BS 6468: 2008, 0 to 300
Depth
Dial gauges and dial
+ 2 more
Microtech Services (Wessex)
Active
ISO 7251
# = 100 A
ISO 6888-3
1) A:2b based on ISO 4833-2:2013 Amd 1:2
2) A:6c based on ISO 21528-1:2017 by mos
+ 1 more
Moorcroft Controls
Active
DC CURRENT
Gas pressure (gauge)
ELECTRICAL
DC VOLTAGE
Measurement
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NSF Wales Limited
Active
BS EN ISO 7686:2005
DIN EN 997
DIN EN 13079
DIN ISO 10381-7
DIN EN 14622
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Nature’s Consultancy
Active
(HSG 248) – 2021
(PCM) based on HSG 248
DOC/002 based on HSG 248)
Normec DETS
Active
BS 1377: Part 2: 1990
DIN EN 12457
No DETSC 5012 based on BS EN
staining based on HSG 248.
(HSG 248) – 2021
+ 1 more
North Star Environmental
Active
(HSG 248) – 2021
NSDOC 47 based on HSG 248
staining based on HSG 248.
(PCM) based on HSG 248
Not One Iota
Active
(HSG 248) – 2021
SOP-12, based on HSG 248
staining based on HSG 248
(PCM) based on HSG 248
Nuclear Restoration Services
Active
AIR KERMA RATE
AMBIENT DOSE
HBs-Antigen (Hepatitis B-Surface
RESPONSE:
PERSONEL DOSE
O.C. Consulting (UK)
Active
(HSG 264, 2012)
Appendix 5 of HSG 227 (2004)
(HSG 248) – 2021
(PCM) based on HSG 248
IEC 61400-23
ASTM G73 (2012)
IEC 60885-3, 2.4.1
IEC 60502-2
IEC 60840
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Olfasense UK
Active
IEC 60519-11
BS EN BS EN ISO 21877:2019
DIN EN ISO 16911-1
Standard and BS EN 15259:2007
DIN EN 13126-19
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One Scientific
Active
ISO 6888-1
ISO 21528-2
BS ISO 4832:2006
ISO 4833-1
ISO 6579-1
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Optical Test & Calibration
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DC Resistance
DC CURRENT
DC VOLTAGE
DC RESISTANCE (cont’d)
PHH Environmental (UK)
Active
HSG 227 (2004))
(HSG 264, 2012)
HSG 264 (2012) and Appx. 3 of
(HSG 248) – 2021
(PCM) based on HSG 248
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