Accurate sound power measurement is essential for quantifying product quietness and overall quality. Standards such as ANSI\/ASA S12.55 and S12.54 (aligned with ISO 3745 and ISO 3744, respectively) require the test environment to support a free-field condition, where sound attenuates in accordance with the inverse square law.<\/p>\n\n\n\n
At Moritani Corporation, we provide comprehensive acoustic testing solutions by integrating the measurement expertise of HBK (Hottinger Br\u00fcel & Kj\u00e6r) with the chamber design innovations of Sonora Technology, a pioneer in anechoic room engineering.<\/p>\n\n\n\n
ANSI\/ASA S12.55 specifies that the inverse square law must hold within the test volume\u2014meaning that the sound pressure level decreases in proportion to the square of the distance from the source. This principle verifies the validity of a free-field condition, essential for accurate acoustic power level evaluation.<\/p>\n\n\n\n
To meet this requirement, we recommend using HBK\u2019s Type 4292-L omnidirectional 12-face speaker in combination with the Type 2734 power amplifier, ensuring a broadband, uniform sound field.<\/p>\n\n\n\n
Sonora\u2019s anechoic chambers are meticulously engineered to meet ISO\/ANSI requirements. Their proprietary BFW (Broadband Fractal Wedge) absorption system achieves low cut-off frequencies and wideband absorption, allowing free-field conditions to extend beyond the central zone of the chamber.<\/p>\n\n\n\n
In semi-anechoic configurations (compliant with ISO 3744), Sonora chambers are designed to maintain K\u2082 \u2264 4 dB, ensuring valid measurements in more practical, floor-reflective environments.<\/p>\n\n\n\n
| Element<\/th> | Specification<\/th><\/tr><\/thead> |
|---|---|
| Chamber<\/th> | Sonora MFAC or SPAC anechoic chamber<\/td><\/tr> |
| Absorbers<\/th> | BFW sound-absorbing wedges<\/td><\/tr> |
| Sound Source<\/th> | HBK Type 4292-L + Type 2734 Amplifier<\/td><\/tr> |
| Microphone<\/th> | HBK Type 4189<\/td><\/tr> |
| Analysis Software<\/th> | BK Connect + Sound Power Module<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n This configuration supports precision testing with K\u2082 \u2264 0.5 dB, satisfying strict ANSI\/ISO requirements for sound power level measurements.<\/p>\n\n\n\n One-Stop Solution for Acoustic Test Environments<\/h2>\n\n\n\nStruggling with mismatched equipment and test room design? Facing issues with K\u2082 verification?<\/p>\n\n\n\n Moritani offers full-cycle solutions\u2014designing and constructing the test chamber, selecting and installing equipment, and verifying system performance. Backed by HBK \u00d7 Sonora technologies, we ensure high-precision, standards-compliant acoustic testing environments.<\/p>\n\n\n\n Contact Moritani<\/strong><\/h2>\n\n\n\n |