Acoustic Testing Room for Product Development & Qualification

Chambre d’essai anéchoïque

Name: Anechoic Test Chamber
Brand: HEMU Acoustics

A purpose-built anechoic test chamber providing a controlled free-field acoustic environment for product noise characterisation, sound power measurement, and pass/fail qualification testing. Background noise ≤ 10 dB(A), compliant with ISO 3745.

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Spécifications techniques

Background noise≤ 10 dB(A)

Free-field cut-off frequency100 Hz / 200 Hz / 315 Hz (model-dependent)

Free-field deviation±1 dB (inverse-square law)

Wall absorption> 99% (α ≥ 0.99) above cut-off

Structural isolationSpring-isolated floating floor + shell

HVAC noise< 15 dB(A) contribution

Door typeAcoustic double-seal, flush mount

Standards complianceISO 3745, ISO 3741, IEC 60704

CommissioningISO 3745 free-field qualification report

ConstructionModular, relocatable

Les spécifications servent uniquement à l’examen préliminaire du projet. Les paramètres finaux, matériaux, certificats et critères d’acceptation doivent être confirmés dans le contrat signé ou la proposition technique approuvée.

Applications

Product noise characterisation (fans, motors, compressors)
Sound power measurement per ISO 3741/3745
Consumer electronics acoustic pass/fail testing
HVAC component noise qualification
Automotive interior component testing
Hearing aid and audio device R&D

Vue d’ensemble

The HEMU Acoustics Anechoic Test Chamber is engineered for industrial R&D labs, quality assurance facilities, and acoustic test centres that require a traceable, repeatable free-field environment for noise measurement. Unlike large research anechoic chambers, the anechoic test chamber is sized and equipped specifically for the product under test (PUT), maximising measurement efficiency while minimising facility footprint.

The chamber's acoustic treatment uses rigid-backed wedge absorbers achieving free-field conditions (±1 dB deviation from inverse-square law) down to the specified cut-off frequency. Background noise levels of ≤ 10 dB(A) — achieved through a floating floor, spring-mounted structural shell, and low-velocity HVAC — ensure that self-noise does not compromise the measurement floor for quiet products such as fans, motors, and consumer electronics.

Standard configurations cover cut-off frequencies of 100 Hz, 200 Hz, or 315 Hz depending on chamber size and absorber specification. A hinged access door and removable floor panel over the test zone allow fixture changes and large EUT installation. Integral cable management conduits and a shielded electrical penetration panel support powered test articles.

The modular construction allows the anechoic test chamber to be installed in existing laboratory buildings and relocated if needed. Commissioning includes free-field qualification testing to ISO 3745 or equivalent, with a measurement uncertainty budget provided for accredited laboratory use.