{"id":18446,"date":"2026-10-20T09:00:00","date_gmt":"2026-10-20T07:00:00","guid":{"rendered":"https:\/\/tps-elektronik.com\/?post_type=case_studies&#038;p=18446"},"modified":"2026-10-09T09:16:40","modified_gmt":"2026-10-09T07:16:40","slug":"how-to-pass-cispr-32-and-fcc-part-15-radiated-emissions-testing-for-consumer-electronics-with-tps-emi-test-lab","status":"publish","type":"case_studies","link":"https:\/\/tps-elektronik.com\/en\/case-studies\/how-to-pass-cispr-32-and-fcc-part-15-radiated-emissions-testing-for-consumer-electronics-with-tps-emi-test-lab\/","title":{"rendered":"How to Pass CISPR 32 and FCC Part 15 Radiated Emissions Testing for Consumer Electronics with TPS EMI Test Lab?"},"content":{"rendered":"<article class=\"blog-post\" lang=\"en\"><header>\n<p>System integrators, procurement teams, and electrical engineers in consumer electronics rarely fail because they lack a product concept. They lose time\u2014and budget\u2014when radiated emissions exceed CISPR 32 or FCC Part 15 limits during formal certification, forcing emergency filter redesigns and delaying retail launch.<br \/>TPS Elektronik\u2019s EMI test laboratory is built to reduce that risk: CISPR 32 and FCC Part 15 pre-compliance testing for radiated emissions, near-field debugging, filter evaluation, and close integration with development so that issues are resolved before accredited certification begins.<\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/emv-laboratory\/\">Request a CISPR 32 \/ FCC Part 15 pre-compliance test \u2192<\/a><\/p>\n<\/header><nav class=\"toc\" aria-label=\"Table of contents\">\n<h2 id=\"toc\">Table of contents<\/h2>\n<ol>\n<li><a href=\"#customer-challenge\">The customer challenge: consumer device failing radiated emissions<\/a><\/li>\n<li><a href=\"#cispr-fcc-requirements\">CISPR 32 and FCC Part 15: what consumer electronics must meet<\/a>\n<ol>\n<li><a href=\"#cispr32-limits\">CISPR 32 Class B limits for residential environments<\/a><\/li>\n<li><a href=\"#fcc-part15\">FCC Part 15 Subpart B: unintentional radiators<\/a><\/li>\n<\/ol>\n<\/li>\n<li><a href=\"#tps-approach\">How TPS EMI test lab solved the problem<\/a>\n<ol>\n<li><a href=\"#initial-scan\">Initial radiated emissions scan and diagnosis<\/a><\/li>\n<li><a href=\"#root-cause\">Root cause: 120 MHz harmonic from switching regulator<\/a><\/li>\n<li><a href=\"#filter-solution\">Filter and layout modifications<\/a><\/li>\n<\/ol>\n<\/li>\n<li><a href=\"#results\">Measured results and customer outcome<\/a><\/li>\n<li><a href=\"#faq\">FAQ<\/a><\/li>\n<\/ol>\n<\/nav>\n<section id=\"customer-challenge\">\n<h2>1. The customer challenge: consumer device failing radiated emissions<\/h2>\n<p>A European consumer electronics company (name withheld under NDA) was developing a smart home hub with integrated Wi-Fi, Bluetooth, and a switching power supply. During pre-launch discussions with a test house, the company learned that their scheduled formal certification was at risk: preliminary measurements suggested radiated emissions would exceed CISPR 32 Class B limits in the 30\u2013230 MHz range.<\/p>\n<p>The product was three weeks from a retail launch commitment. A failed certification would delay revenue, require expensive re-testing, and potentially force a redesign of the enclosure and PCB. The company needed a fast, accurate diagnosis\u2014not a full certification service, but a pre-compliance partner who could identify the root cause and verify corrective actions before the formal lab visit.<\/p>\n<\/section>\n<section id=\"cispr-fcc-requirements\">\n<h2>2. CISPR 32 and FCC Part 15: what consumer electronics must meet<\/h2>\n<p>Consumer electronics sold in the European Union must comply with the EMC Directive 2014\/30\/EU, which lists CISPR 32 as the harmonized emissions standard for multimedia equipment. In the United States, the FCC Part 15 Subpart B regulations govern unintentional radiators. Both standards define radiated emissions limits for residential environments.<\/p>\n<h3 id=\"cispr32-limits\">2.1 CISPR 32 Class B limits for residential environments<\/h3>\n<p>CISPR 32 Class B limits apply to equipment intended for use in residential environments. For radiated emissions at 3 meters measurement distance, the limits are:<\/p>\n<ul>\n<li>30\u2013230 MHz: 40 dB\u03bcV\/m quasi-peak<\/li>\n<li>230\u20131000 MHz: 47 dB\u03bcV\/m quasi-peak<\/li>\n<\/ul>\n<p>These limits are stricter than Class A (industrial) limits by approximately 10 dB. The measurement method is defined in CISPR 16-2-3, using a semi-anechoic chamber, calibrated antennas, and a quasi-peak detector with specified bandwidths.<\/p>\n<h3 id=\"fcc-part15\">2.2 FCC Part 15 Subpart B: unintentional radiators<\/h3>\n<p>FCC Part 15 Subpart B applies to unintentional radiators, including digital devices and peripheral equipment. The radiated emissions limits for Class B digital devices at 3 meters are harmonized with CISPR 22 and CISPR 32, with the same 40 dB\u03bcV\/m (30\u201388 MHz), 43.5 dB\u03bcV\/m (88\u2013216 MHz), 46 dB\u03bcV\/m (216\u2013960 MHz), and 54 dB\u03bcV\/m (above 960 MHz) quasi-peak limits. Compliance with FCC Part 15 is required for any digital device marketed in the United States.<\/p>\n<p>For the customer, the practical implication was clear: a single radiated emission peak exceeding the limit would fail both EU and US market access requirements. TPS\u2019s <a href=\"https:\/\/tps-elektronik.com\/en\/electromagnetic-compatibility-testing-compliance-guide\/\">EMC compliance guide<\/a> and <a href=\"https:\/\/tps-elektronik.com\/en\/how-to-test-electromagnetic-compatibility-emc-guide\/\">how to test EMC guide<\/a> provide additional context on these standards.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-18585\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/10\/EMI-Test-Lab-Near-Field-Probe-Debugging-CISPR-32-2-1.jpg\" alt=\"EMI Test Lab Near-Field Probe Debugging CISPR 32 Fehlersuche im EMV-Pr\u00fcflabor mittels Nahfeldsonden gem\u00e4\u00df CISPR 32\" width=\"1920\" height=\"1080\" \/><\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/emv-laboratory\/\">Discuss your CISPR 32 \/ FCC Part 15 needs with TPS \u2192<\/a><\/p>\n<\/section>\n<section id=\"tps-approach\">\n<h2>3. How TPS EMI test lab solved the problem<\/h2>\n<p>TPS received the customer\u2019s prototype and conducted a full radiated emissions pre-compliance scan in its semi-anechoic chamber. The scan was performed to CISPR 32 measurement procedures, covering 30 MHz to 1 GHz with both horizontal and vertical antenna polarizations.<\/p>\n<h3 id=\"initial-scan\">3.1 Initial radiated emissions scan and diagnosis<\/h3>\n<p>The initial scan confirmed the customer\u2019s concern: a prominent emission at 120 MHz exceeded the CISPR 32 Class B limit by 6 dB. A second harmonic at 240 MHz also exceeded the limit. The emissions were present in both horizontal and vertical polarizations, suggesting a common-mode current source on the PCB or cables.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-18580\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/10\/CISPR-32-Radiated-Emissions-Before-After-Filter-Modification-3.jpg\" alt=\"CISPR 32 Radiated Emissions Before After Filter Modification CISPR 32 \u2013 Gestrahlte St\u00f6raussendungen vor und nach der Filtermodifikation\" width=\"1920\" height=\"1080\" \/><\/p>\n<h3 id=\"root-cause\">3.2 Root cause: 120 MHz harmonic from switching regulator<\/h3>\n<p>Using near-field probes, TPS engineers localized the emission source to the switching regulator circuit. The regulator\u2019s 1.2 MHz switching frequency had a 100th harmonic at 120 MHz that was coupling onto the input power cable and radiating. The existing input filter was designed for conducted emissions but had insufficient attenuation at 120 MHz.<\/p>\n<h3 id=\"filter-solution\">3.3 Filter and layout modifications<\/h3>\n<p>TPS recommended a three-part corrective action:<\/p>\n<ul>\n<li><strong>Add a common-mode choke<\/strong> on the DC input cable, rated for the operating current and with high impedance at 120 MHz.<\/li>\n<li><strong>Improve PCB grounding<\/strong> around the switching regulator, reducing the loop area for high-frequency currents.<\/li>\n<li><strong>Add a small ferrite bead<\/strong> on the regulator\u2019s switch node to slow the edge rate and reduce harmonic energy.<\/li>\n<\/ul>\n<p>These modifications were implemented on the prototype and re-tested. The 120 MHz peak was reduced by 12 dB, bringing it 6 dB below the CISPR 32 Class B limit. The 240 MHz harmonic was also reduced below the limit.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-18575\" src=\"https:\/\/tps-elektronik.com\/wp-content\/uploads\/2026\/10\/FCC-Part-15-EMI-Testing-Pre-Compliance-Report-TPS-4.jpg\" alt=\"FCC Part 15 EMI Testing Pre-Compliance Report TPS Pre-Compliance-Bericht zur FCC-Teil-15-EMI-Pr\u00fcfung (TPS)\" width=\"1920\" height=\"1080\" \/><\/p>\n<\/section>\n<section id=\"results\">\n<h2>4. Measured results and customer outcome<\/h2>\n<p>The customer proceeded to formal certification at an accredited test house with confidence. The formal test confirmed that the product met both CISPR 32 Class B and FCC Part 15 Subpart B radiated emissions limits with margin. The retail launch proceeded on schedule.<\/p>\n<p>TPS provided a detailed pre-compliance test report documenting the initial failure, the root cause analysis, the corrective actions, and the final passing measurement. This report was accepted by the customer\u2019s quality team and referenced in the technical file for the EU Declaration of Conformity.<\/p>\n<p>This project reflects TPS\u2019s broader approach to EMC pre-compliance. The <a href=\"https:\/\/tps-elektronik.com\/en\/case-studies\/electromagnetic-compatibility-testing-customer-case\/\">EMC testing customer case<\/a> and the <a href=\"https:\/\/tps-elektronik.com\/en\/case-studies\/emc-testing-collaboration-tps-elektronik\/\">EMC testing collaboration case study<\/a> document similar engagements. For projects requiring both EMC and electrical safety, see the <a href=\"https:\/\/tps-elektronik.com\/en\/emc-electrical-safety-testing-compliance-reliability\/\">EMC and electrical safety testing guide<\/a>.<\/p>\n<p><a class=\"cta-primary\" href=\"https:\/\/tps-elektronik.com\/en\/services\/emv-laboratory\/\">Request your CISPR 32 \/ FCC Part 15 pre-compliance test \u2192<\/a><\/p>\n<\/section>\n<section id=\"faq\">\n<h2>5. FAQ<\/h2>\n<div>\n<h3>What is the difference between CISPR 32 Class A and Class B?<\/h3>\n<div>\n<div>Class A limits apply to equipment intended for use in industrial environments, while Class B limits apply to equipment intended for residential environments. Class B limits are approximately 10 dB stricter than Class A limits. Consumer electronics typically must meet Class B limits for both EU and US market access.<\/div>\n<\/div>\n<h3>Can TPS provide formal certification for CISPR 32 or FCC Part 15?<\/h3>\n<div>\n<div>No. TPS operates an EMI test laboratory for pre-compliance testing only. We help customers identify and fix emissions issues before formal certification. The final certification must be performed by an accredited test house. TPS provides the pre-compliance test report that supports the formal certification process.<\/div>\n<\/div>\n<h3>How long does a typical CISPR 32 radiated emissions pre-compliance test take?<\/h3>\n<div>\n<div>A full radiated emissions scan from 30 MHz to 1 GHz typically takes 2\u20134 hours, depending on the device complexity and the number of operating modes. If debugging is required, additional time may be needed for near-field probing and filter evaluation. TPS provides a test report within 2\u20133 business days after the test.<\/div>\n<\/div>\n<h3>What is the most common cause of radiated emissions failures in consumer electronics?<\/h3>\n<div>\n<div>Switching power supply harmonics, high-speed digital clock harmonics, and cable common-mode currents are the most common causes. In many cases, the emission originates from a cable acting as an antenna, driven by a common-mode current from the PCB. Filtering at the cable interface and improving PCB grounding are typical corrective actions.<\/div>\n<\/div>\n<h3>Does TPS test to both CISPR 32 and FCC Part 15 in the same session?<\/h3>\n<div>\n<div>Yes. The radiated emissions limits for CISPR 32 Class B and FCC Part 15 Subpart B are harmonized, so a single measurement session can demonstrate compliance with both standards. TPS provides a test report that references both CISPR 32 and FCC Part 15 limits.<\/div>\n<\/div>\n<\/div>\n<\/section>\n<footer style=\"background: #2d5797; padding: 30px; border-radius: 14px; margin-top: 40px;\">\n<p style=\"color: #ffffff; font-size: 16px; line-height: 1.6; margin: 0;\"><strong>Ready to reduce your CISPR 32 and FCC Part 15 certification risk?<\/strong><br \/>Contact TPS Elektronik for pre-compliance testing, near-field debugging, and filter evaluation in our EMI test laboratory\u2014from prototype diagnosis to formal certification readiness.<br \/><a style=\"color: #ffffff; font-weight: 600; text-decoration: underline;\" href=\"https:\/\/tps-elektronik.com\/en\/services\/emv-laboratory\/\">Request your EMI test consultation \u2192<\/a><\/p>\n<\/footer><\/article>\n\n<style id=\"wpforms-css-vars-4659-block-1b5cb256-546a-41c5-b789-a9be9938acc3\">\n\t\t\t\t#wpforms-4659.wpforms-block-1b5cb256-546a-41c5-b789-a9be9938acc3 {\n\t\t\t\t--wpforms-field-size-input-height: 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They lose time\u2014and budget\u2014when radiated emissions exceed CISPR 32 or FCC Part 15 limits during formal certification, forcing emergency filter redesigns and delaying retail launch.TPS Elektronik\u2019s EMI test laboratory is built to reduce that risk: CISPR 32\u2026 <a href=\"https:\/\/tps-elektronik.com\/en\/case-studies\/how-to-pass-cispr-32-and-fcc-part-15-radiated-emissions-testing-for-consumer-electronics-with-tps-emi-test-lab\/\">Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"featured_media":18585,"template":"","class_list":["post-18446","case_studies","type-case_studies","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Pass CISPR 32 and FCC Part 15 Radiated Emissions Testing for Consumer Electronics with TPS EMI Test Lab? - TPS<\/title>\n<meta name=\"description\" content=\"CISPR 32 and FCC Part 15 radiated emissions testing for consumer electronics. 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