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
1,868
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Obligat anaerobe Bakterien
Grampositive aerobe und
anaerobe Kokken
Enterokokken
Mikrokokken
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automatische Zelldifferenzierung
Erythrozyten
Leukozyten
Retikulozyten
Thrombozyten
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Melutec Metrology
Active
Parallelendmaße * 0,5 mm
DIN EN ISO 3650:1999
Parallelendmaße
> 100 mm
Messschieber für Außen-, 0 mm
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Meridian Technical Services
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BS EN 14876:2007/Internal proceduresDiss
BS EN ISO 18119:2018+A1:2021
BS EN ISO 22434:2011
BS EN ISO 10460:2018
BS EN ISO 13769:2018
tungsten carbide)
Plain ring gauges (taper)
Straight edges
LENGTH (cont’d)
Squares
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Metrolution
Active
Metrosoft CM, Software einer Raumdiagona
AG, Chur, CH ≤ 3333 mm
Oberkochen, D
GmbH, Wetzlar, D
AG, Chur, CH ≤ 7500 mm
Mettler-Toledo
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Flüssigkeitsvolumen *
Kolbenhubpipetten
Manuell betätigte
spritzen
Mehrfachdispenser
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MeßTechnikNord
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- Gleichspannung
Messverstärker > 120 mV
> 1 V
> 12 V
> 1000 V
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Micro Precision (Midlands)
Active
LENGTH
Caliper
Depth BS 6468: 2008, 0 to 300
Depth
Dial gauges and dial
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Microtech Gefell
Active
Akustische Messgrößen
Messmikrofone nach
(DIN EN 61094-4:1996)
Schalldruckpegel (Druck)
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Microtech Services (Wessex)
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ISO 7251
# = 100 A
ISO 6888-3
1) A:2b based on ISO 4833-2:2013 Amd 1:2
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ASTM B212-21
ASTM E1019-24
ASTM B527-24
BS EN ISO 3923-1
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ETSI EN 319 412
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ETSI EN 319 411-1
Ministry of Defence
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Specific Values
Specific values (continued)
ELECTRICAL
Other Values
AC CURRENT
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Mitutoyo Deutschland
Active
Parallelendmaße 0,5 mm
DIN EN ISO 3650:1999
Parallelendmaße
> 10 mm
Parallelendmaße > 100 mm
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Mobiler Kalibrierdienst Fini
Active
Gleichspannung 3 mV
Messgeräte 10 mV
> 100 mV
> 220 mV
> 11 V
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IEC 61000-4-7
IEC 61000-4-15
IEC 61000-4-30
IEC 61400-21
IEC 61400-21-1
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Temperatur 50 °C
Railway brake handbooks (UIC 547)
1) In den CMC sind die erweiterten Messu
Moorcroft Controls
Active
DC CURRENT
Gas pressure (gauge)
ELECTRICAL
DC VOLTAGE
Measurement
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IEC 61000-4-2: 2008
VDE 0847-4-2
IEC 61000-4-3: 2006
VDE 0847-4-3
IEC 61000-4-4: 2012
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