BS EN ISO 3744:2010 – Determination of Sound Power Levels of Noise Sources
This standard specifies methods for measuring the sound power levels of machines and equipment in sound-reverberant or semi-anechoic environments. It is widely used to support regulatory compliance, product specifications, and noise control assessments in industrial and commercial settings.
BS EN ISO 3745:2012 – Determination of Sound Power Levels in an Anechoic Room
This standard provides procedures for measuring the sound power levels of noise sources in precision anechoic rooms, ensuring accurate and repeatable results. It is ideal for manufacturers, acoustic consultants, and engineers who require high-accuracy noise measurements for product development, certification, and compliance reporting.
Our hemi-anechoic chamber is designed with sound power and noise emission testing in-mind. Get in touch if you aren’t sure which standard applies to your requirements, or if you’d like us to investigate any specific noise test codes for your device. It’s not just about testing 'loud' devices though, with a background noise level of 8.8 dBA, the sound pressure levels between 100 Hz – 10 kHz are below the threshold of hearing, making this specialist facility ideal for testing the noise floor of very quiet devices.
The test specimen is mounted and operated as it would be under typical usage, unless instructed otherwise by a noise test code. Sound pressure level is measured at between five and forty microphone positions across the surface of a theoretical hemisphere and is mathematically resolved into a sound power level, applying corrections for measurement radius, meteorological conditions, background noise, and acoustic impedance factors. Noise emission levels can also be calculated from the resulting data set, in accordance with BS EN ISO 3744:2010 and BS EN ISO 3745:2012.
Results are provided in a detailed report containing all the information you need regarding the installation and performance of your test specimen. The numerical data is typically provided as 1/3 octave band unweighted sound power level and the unweighted and A-weighted broadband sound power levels. As a research laboratory, we are also in an excellent position to provide bespoke data analysis and reporting options to support product development or product comparison.
Sound insulation testing – ISO 10140-2
Medical devices (Noise and Vibration) – IEC 60601-1
Occupational vibration – ISO 5349
Absorption coefficient testing – ISO 10534-1
Insertion loss for hearing defenders – ISO 4869
Electroacoustics and Speech Intelligibility – IEC 60268
Don’t see what you need in this list? Get in touch to enquire about our full testing capabilities
Amongst our extensive array of acoustic measurement equipment, we also have specialised test equipment typically utilised for R&D and QC, including stock of the following:
Laser doppler vibrometer; Head and Torso Simulator; Force transducer; Accelerometers; Electrodynamic shaker; Acoustic intensity probe; Reference sound power source; Artificial ear
The expert team at KP Acoustics Research Labs spent a combined 30+ years in the education sector designing, managing and delivering undergraduate and postgraduate degree courses, as well as accredited and bespoke professional courses. Let us help your first-line support, technical advisors, design consultants, sales and marketing teams promote confidence in your products and services by fully understanding the terminology and underpinning concepts behind the acoustic performance, compliance requirements, and practical applications relevant to your industry.
