{"id":915,"date":"2025-08-21T15:01:17","date_gmt":"2025-08-21T06:01:17","guid":{"rendered":"https:\/\/acoustic-measurement.com\/?post_type=technology&#038;p=915"},"modified":"2025-08-04T15:12:22","modified_gmt":"2025-08-04T06:12:22","slug":"automated-sound-pressure-scanning-for-iso-26101","status":"publish","type":"technology","link":"https:\/\/acoustic-measurement.com\/en\/technology\/automated-sound-pressure-scanning-for-iso-26101\/","title":{"rendered":"Automated Sound Pressure Scanning for ISO 26101 Validation \u2014 Free-Field Compliance Using HBK + Traversing System in Sonora Anechoic Chambers \u2014"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction: What is the Inverse Square Law in Acoustic Power Testing?<\/h2>\n\n\n\n<p>In ISO 3744 and ISO 26101, verifying that a test space approximates a <strong>free-field environment<\/strong> is critical.<br>One key requirement is confirming that sound pressure level (SPL) decreases by approximately <strong>6 dB per doubling of distance<\/strong> from the source \u2014 known as the <strong>inverse square law<\/strong>.<\/p>\n\n\n\n<p>To validate this, ISO 26101 specifies:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SPL comparison at multiple distances from the sound source<\/li>\n\n\n\n<li>Linear decay relationship between log(distance) and SPL<\/li>\n\n\n\n<li>Allowable deviation within \u00b11.5 dB over specified frequency ranges<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">The Challenge: Manual Testing Is Not Enough<\/h2>\n\n\n\n<p>Accurate inverse square validation requires <strong>high-precision, repeatable measurement<\/strong> at defined distances.<br>Manual mic placement often leads to errors, variations, and low repeatability.<\/p>\n\n\n\n<p>The solution: an <strong>automated traversing system<\/strong> combined with <strong>HBK\u2019s precision acoustic front-end<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>System Configuration: SPAC \/ VSAC \u00d7 Traverser \u00d7 HBK<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th><strong>Component<\/strong><\/th><th><strong>Description<\/strong><\/th><\/tr><\/thead><tbody><tr><th>Test Space<\/th><td>SPAC or VSAC: Sonora\u2019s anechoic chambers with controlled acoustic fields<\/td><\/tr><tr><th>Microphone<\/th><td>HBK Free-Field Mic (e.g. Type 4189) + LAN-XI modules<\/td><\/tr><tr><th>Movement<\/th><td>XYZ-axis traversing system (stepper motor or servo-driven, 0.5 mm precision)<\/td><\/tr><tr><th>Analysis Software<\/th><td>HBK PULSE or BK Connect: linear regression, deviation plots, pass\/fail logic<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Why Use a Traversing System?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Accurate mic positioning<\/strong> at various radii (r\u2081, r\u2082, r\u2083\u2026)<\/li>\n\n\n\n<li><strong>Consistent, automated measurement sweep<\/strong> for each frequency band<\/li>\n\n\n\n<li><strong>Data visualization<\/strong> for inverse square plots with trendlines<\/li>\n\n\n\n<li>Enables ISO-compliant reporting and lab certification<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Typical Use Cases<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>In-house acoustic labs<\/strong> for small motors, fans, or appliances<\/li>\n\n\n\n<li>Preparing for <strong>international compliance or CE marking<\/strong><\/li>\n\n\n\n<li><strong>Design verification<\/strong> of free-field zones within custom test rooms<\/li>\n\n\n\n<li><strong>Standardizing test procedures<\/strong> for training or production QA<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Why HBK?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>High-fidelity microphones<\/strong> with calibration traceability<\/li>\n\n\n\n<li><strong>LAN-XI modules<\/strong> provide synchronized, multi-channel A\/D conversion<\/li>\n\n\n\n<li><strong>PULSE\/BK Connect<\/strong> offers real-time frequency analysis &amp; ISO workflows<\/li>\n\n\n\n<li>Can be fully <strong>integrated with motion control and PLC systems<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Consultation &amp; Support<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Design and integration of a Sonora chamber + traversing system<\/li>\n\n\n\n<li>HBK sensor and software setup tailored to your test goals<\/li>\n\n\n\n<li>Support for ISO 26101 mic positioning and evaluation methods<\/li>\n\n\n\n<li>On-site training or turnkey system delivery available<\/li>\n<\/ul>\n\n\n\n<p>\u25b6 <strong>[<a href=\"https:\/\/acoustic-measurement.com\/en\/contact\/\"><strong>Contact Moritani for System Integration Support<\/strong><\/a>]<\/strong><\/p>\n\n\n\n<div class=\"btn_area\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"btn_style black\"><a href=\"https:\/\/acoustic-measurement.com\/en\/solution\/vsac\/\">Learn more about VSAC + Pass-by Noise System and Related Products<\/a><\/p>\n\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction: What is the Inverse Square Law in Acoustic Power Testing? In ISO 3744 and ISO 26101, verifying that a test space approximates a free-field environment is critical.One key requirement is confirming that sound pressure level (SPL) decreases by approximately 6 dB per doubling of distance from the source \u2014 known as the inverse square [&hellip;]<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","solution_cat":[6,2],"class_list":["post-915","technology","type-technology","status-publish","hentry","solution_cat-tax_vsac","solution_cat-tax_power","en-US"],"acf":[],"_links":{"self":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/technology\/915","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/technology"}],"about":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/types\/technology"}],"wp:attachment":[{"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/media?parent=915"}],"wp:term":[{"taxonomy":"solution_cat","embeddable":true,"href":"https:\/\/acoustic-measurement.com\/wp-json\/wp\/v2\/solution_cat?post=915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}