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
🇮🇹
UNI EN ISO 9614-1
🇪🇸
UNE EN ISO 9614-1
🇳🇱
NEN EN ISO 9614-1
1,868
Accredited labs
20
Countries
Showing 1,276–1,300 of 1,868 labs
Pennington Choices
Active
(HSG 264, 2012)
and Appx. 3 of HSG 227 (2004))
Executive guides HSG 264 (2012)
Perry Analytical
Active
(HSG 248) – 2021
(PCM) based on HSG 248
Manual based on HSG 248
Perschmann Calibration
Active
Parallelendmaße * 0,5 mm
DIN EN ISO 3650:1999
> 100 mm
Sonderquerschnitt (rund
Parallelendmaße * > 100 mm
+ 3 more
DIN EN 1932
DIN EN 12179
DIN EN 12211
DIN EN 12444
ASTM E547-00
+ 3 more
Temperaturmessgrößen
Widerstandsnormal
thermometer (IPRT)
Zeiss Industrielle
Temperaturmessgrößen −35 °C
+ 3 more
IEC 61984
IEC 60998-1
IEC 60998-2-1
IEC 60998-2-2
IEC 60998-2-3
+ 3 more
Polytest Ingenieure
Active
DIN EN ISO 9934-1
DIN ISO 815-1
DIN ISO 815-2
DIN ISO 4593
DIN EN 50178: 1998
+ 3 more
Poulten Selfe and Lee
Active
TEMPERATURE
Viscosity constant ‘C’
Reference viscometers:
ASTM D4052 (Digital density
Power Diagnostix Systems
Active
Impulsladung
Anstiegszeit
Impulsdauer
Wechselspannung 1 V
> 1,1 kV
+ 3 more
Differentialblutbild
Erythrozyten
Hämatokrit
Leukozyten
Retikulozyten
+ 3 more
External (Tip) Diameter
Helix (lead) total deviation (F
GEARS SPUR/HELICAL EXTERNAL (cont’d)
As for Involute Spline Gauges
HbA1c
Automatisches Blutbild
Leukozyten
Normoblasten
Retikulozyten
+ 3 more
Calcium
Bilirubin gesamt
Creatinkinase-Muscle-Brain
TPZ nach Quick
Immunglobulin A
+ 3 more
ProfEC Ventus
Active
IEC 61400-12 Ed.1 *
IEC 61400-12-1 Ed.3 *
IEC 61400-12-3 Ed.1 *
IEC 61400-12-4 Ed.1 *
IEC 61400-12-5 Ed.1 *
+ 3 more
ISO 13325
ISO 15222
ISO 15835-2
UNE-EN 10002-1
BS EN ISO 15630-1:2019
UNE-EN 10080
BS EN ISO 15630-3:2019
+ 3 more
Prüftechnik Buchmann
Active
Vickers hardness test (ISO 6507)
Härte (WPM) * 80 HBW
Härteprüfmaschinen nach
Brinell-, Vickers-, Knoop
> 250 HBW
+ 3 more
ISO 6579-1
ISO 15213-2
ISO 11290-1
ISO 7932
F100 based on BS EN ISO
+ 3 more
Pullman Instruments (UK)
Active
DC CURRENT
Measurement
DC VOLTAGE
AC Current Generation
DC RESISTANCE (cont’d)
+ 3 more
No matching labs found.