Scope
ISO 3744
Sound power — enveloping surface engineering method
ISO 3744 specifies the engineering method for determining sound power and sound energy levels using sound pressure measurements obtained on an imaginary surface (hemispherical or parallelepiped) surrounding a noise source. This method is widely used for in-situ testing of machinery, industrial equipment, and large installations where reverberation room testing is impractical. It provides a practical balance between accuracy and field applicability, making it suitable for machinery compliance testing, environmental noise assessments, and product CE marking requirements across the EU. ISO 17025 accreditation confirms laboratory proficiency in sound field measurement, environmental parameter correction, and uncertainty quantification for this complex measurement method.
What it measures
- Sound power level (Lw) using enveloping surface pressure data
- A-weighted and frequency-weighted sound power
- Octave and one-third-octave band sound power (63 Hz to 8 kHz)
- Environmental and measurement corrections
- Sound power directivity and spatial variability
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DIN EN ISO 3740
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BS EN ISO 3740
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NF EN ISO 3740
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UNI EN ISO 3740
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UNE EN ISO 3740
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NEN EN ISO 3740
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DIN EN ISO 3743-1
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BS EN ISO 3743-1
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NF EN ISO 3743-1
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UNI EN ISO 3743-1
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UNE EN ISO 3743-1
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NEN EN ISO 3743-1
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Hrabakova 1861/1 | 702 00 Moravska Ostrava A Privoz | Republique Tcheque, CZ
NF X43-050 (parties utiles de la norme)
NF X43-050 (useful parts of the standard
NF X43-050 (parties utiles de la norme)
NF X43-050 (useful parts of the standard
ISO 16000-7
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Industries
Industrial machinery manufacturers
Construction equipment producers
HVAC and ventilation systems
Power generation and compressor suppliers
Large transport and handling equipment makers
Related Standards
- ISO 3740 Acoustics — Determination of sound power levels of noise sources — General guidelines
- ISO 3743-1 Acoustics — Determination of sound power levels of noise sources — Part 1: Reverberation room method
- ISO 3745 Acoustics — Determination of sound power levels of noise sources — Precision method using an enveloping surface
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- Tensile / Compression / Flexural
- Hardness (Vickers, Rockwell, Brinell)
- Impact / Charpy / Izod
- Fatigue / Creep
- Torsion / Shear
- Elemental Analysis
- Spectroscopy (XRF, ICP, AAS)
- Chromatography (GC, HPLC)
- REACH Substance Testing
- RoHS Compliance Testing
- Technical Cleanliness
- EMC / EMI Testing
- Radio Frequency
- CE Marking Compliance
- Corrosion / Salt Spray
- Climate / Temperature Cycling
- UV / Weathering
- Vibration / Shock
- Noise / Acoustics
- Sterility Testing
- Biocompatibility (ISO 10993)
- Food Safety Testing
- Dimensional / Geometric
- Force / Torque
- Temperature / Pressure
- Electrical
- Ultrasonic Testing (UT)
- Radiographic Testing (RT)
- Magnetic Particle (MT)
- Penetrant Testing (PT)
- Reaction to Fire
- Resistance to Fire
- Construction Products
- Fiber Analysis
- Color Fastness
- Physical Properties
- Rail Dynamic Behaviour / Running Tests
- Rail Braking Systems
- Rail Noise / Ground-borne Vibration
- Clinical Chemistry
- Hematology
- Immunology / Serology
- Clinical Microbiology
- Molecular Diagnostics / PCR
- Histopathology / Cytology
- Drinking Water Analysis
- Wastewater / Effluent Testing
- Environmental / Surface Water
- Legionella / Microbiological
- Contaminants / Heavy Metals
- Nutritional Analysis
- Food Microbiology
- Pesticide Residues
- Allergen Testing
- Concrete / Cement
- Aggregates / Soils
- Geotechnical Testing
- Asphalt / Bituminous
- Fuel Testing
- Lubricants / Oils
- Gas Analysis
- Product Safety (IEC 60335, IEC 62368)
- Installation / Wiring Testing
- High Voltage Testing
- Stability Testing
- Dissolution Testing
- Impurities / Residual Solvents
- Raw Material Testing
- Automotive Materials Testing
- Emissions Testing
- Component / Parts Testing
- Durability / Endurance