{"id":20374,"date":"2026-10-30T10:10:45","date_gmt":"2026-10-30T02:10:45","guid":{"rendered":"https:\/\/www.wehopower.com\/news\/mdr60-ac-emi-filter-pairing\/"},"modified":"2026-10-30T10:10:45","modified_gmt":"2026-10-30T02:10:45","slug":"mdr60-ac-emi-filter-pairing","status":"publish","type":"news","link":"https:\/\/www.wehopower.com\/ms\/news\/mdr60-ac-emi-filter-pairing\/","title":{"rendered":"Adding an AC EMI Filter to an MDR-60-12 Panel: Define the Pairing Test"},"content":{"rendered":"<div class=\"weho-blog-content\">\n<p><strong>Do not approve an external AC EMI filter for an MDR-60-12 solely from its current rating or a catalogue attenuation curve.<\/strong> Define the panel&#8217;s emissions problem, choose a candidate for the actual AC input conditions, then evaluate the assembled supply, filter, bonding and cable arrangement together. The result applies to that configuration.<\/p>\n<p>The MDR-60-12 is the 12 V, 5 A variant in the MDR-60 family. Those are output ratings; they do not mean that the AC filter should simply be selected as a \u201c5 A filter.\u201d This guide gives the panel engineer a pairing-test brief and a record for deciding whether a candidate filter helps without creating an unacceptable electrical or thermal condition.<\/p>\n<nav class=\"toc\" aria-label=\"Article contents\">\n<p>In this article<\/p>\n<ol>\n<li><a href=\"#define-the-problem\">Write the failure description before selecting hardware<\/a><\/li>\n<li><a href=\"#choose-a-candidate\">Screen the candidate against the actual input duty<\/a><\/li>\n<li><a href=\"#interpret-curves\">Compare the relevant interference mode<\/a><\/li>\n<li><a href=\"#pairing-test\">Run a controlled baseline and candidate comparison<\/a><\/li>\n<li><a href=\"#leakage-and-release\">Keep leakage evidence with the final assembly<\/a><\/li>\n<\/ol>\n<\/nav>\n<section id=\"define-the-problem\">\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Jadual Kandungan<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Togol<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.wehopower.com\/ms\/news\/mdr60-ac-emi-filter-pairing\/#Write_the_failure_description_before_selecting_hardware\" >Write the failure description before selecting hardware<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.wehopower.com\/ms\/news\/mdr60-ac-emi-filter-pairing\/#Screen_the_candidate_against_the_actual_input_duty\" >Screen the candidate against the actual input duty<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.wehopower.com\/ms\/news\/mdr60-ac-emi-filter-pairing\/#Compare_the_relevant_interference_mode\" >Compare the relevant interference mode<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.wehopower.com\/ms\/news\/mdr60-ac-emi-filter-pairing\/#Run_a_controlled_baseline_and_candidate_comparison\" >Run a controlled baseline and candidate comparison<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.wehopower.com\/ms\/news\/mdr60-ac-emi-filter-pairing\/#Keep_leakage_evidence_with_the_final_assembly\" >Keep leakage evidence with the final assembly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.wehopower.com\/ms\/news\/mdr60-ac-emi-filter-pairing\/#Use_the_project_record\" >Use the project record<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.wehopower.com\/ms\/news\/mdr60-ac-emi-filter-pairing\/#Sources_and_further_reading\" >Sources and further reading<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Write_the_failure_description_before_selecting_hardware\"><\/span>Write the failure description before selecting hardware<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The <a href=\"https:\/\/www.wehopower.com\/ms\/product\/wholesale-60w-single-output-din-rail-power-power-supply\/\">WEHO MDR-60 product page<\/a> states that the supply is a component and that final-equipment EMC must be reconfirmed. The correct <a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/MDR-60.pdf\">MDR-60 specification sheet<\/a> identifies the 12 V, 0\u20135 A version. A component claim does not establish the result for a panel with different wiring, loads or an added filter.<\/p>\n<p>Start the test brief with the applicable final-equipment requirement, installation environment, affected frequency band and operating mode. Attach the baseline trace or report if one exists. If there is no measurement, record the suspected interference path as a hypothesis. An external filter cannot be credited with solving a failure that has not been defined.<\/p>\n<p>Keep output ripple and AC-line interference as different tasks. A DC output measurement may be relevant to a sensitive receiver, but it does not replace a mains conducted-emissions test. Likewise, an AC-filter comparison cannot establish the receiver&#8217;s allowed DC ripple.<\/p>\n<\/section>\n<section id=\"choose-a-candidate\">\n<h2><span class=\"ez-toc-section\" id=\"Screen_the_candidate_against_the_actual_input_duty\"><\/span>Screen the candidate against the actual input duty<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.tdk-electronics.tdk.com\/download\/3107934\/7f30b0110a521bb506ace36f0c56af5c\/pdf-technical-information.pdf\" target=\"_blank\" rel=\"noopener\">TDK&#8217;s EMC-filter technical information<\/a> defines rated current under specified conditions and calls for temperature derating where applicable. It also notes that non-sinusoidal input current can produce additional thermal loading. Use the candidate filter&#8217;s own voltage, frequency, current, temperature and overload conditions, together with the documented or measured panel input duty.<\/p>\n<div class=\"table-scroll\">\n<div class=\"table-wrap\" role=\"region\" aria-label=\"Data table\" tabindex=\"0\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Candidate check<\/th>\n<th scope=\"col\">Information needed<\/th>\n<th scope=\"col\">Hold the candidate if\u2026<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Voltage and topology<\/td>\n<td>Actual mains range and the filter connection type.<\/td>\n<td>The required supply system is outside the filter rating.<\/td>\n<\/tr>\n<tr>\n<td>Current and temperature<\/td>\n<td>Panel input current, waveform\/duty and filter derating.<\/td>\n<td>A DC output current is the only selection basis.<\/td>\n<\/tr>\n<tr>\n<td>Startup and protection<\/td>\n<td>Supply startup demand, upstream device and filter limits.<\/td>\n<td>Short-duration duty or protection coordination is unresolved.<\/td>\n<\/tr>\n<tr>\n<td>Mechanical and bonding<\/td>\n<td>Filter maker mounting instructions and final layout.<\/td>\n<td>The intended installation cannot meet those instructions.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>Ask the filter supplier for any missing condition rather than treating a larger ampere number as a complete substitute for application evidence. This article deliberately does not nominate a filter part number: no measured panel spectrum or exact installation has been supplied.<\/p>\n<\/section>\n<section id=\"interpret-curves\">\n<h2><span class=\"ez-toc-section\" id=\"Compare_the_relevant_interference_mode\"><\/span>Compare the relevant interference mode<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/www.schurter.com\/en\/knowledge\/measurment-method-for-emc-filter\" target=\"_blank\" rel=\"noopener\">SCHURTER&#8217;s filter-measurement explanation<\/a> separates common-mode and differential-mode insertion-loss arrangements. In its common-mode measurement, line and neutral are evaluated with respect to earth; the differential-mode measurement concerns line versus neutral. A curve for one mode is not evidence of the other mode&#8217;s attenuation in your assembly.<\/p>\n<p>Use those curves to shortlist candidates, then retain the actual test setup and layout in the comparison. A catalogue curve belongs to its stated measurement arrangement. Do not subtract its dB value from a failing panel trace and publish the resulting arithmetic as a measured pass.<\/p>\n<figure class=\"figure\" id=\"figure-diagram\"><picture><source media=\"(max-width: 600px)\" srcset=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/decision-map-mobile-3.svg\" width=\"480\" height=\"1410\" type=\"image\/svg+xml\"><img loading=\"lazy\" src=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/decision-map-3.svg\" alt=\"Adding an AC EMI Filter to an MDR-60-12 Panel: Define the Pairing Test  title=\" width=\"1200\" height=\"740\" decoding=\"async\" adding an ac emi filter to mdr-60-12 panel: define the pairing test title =\"\"><\/picture><figcaption>AC filter pairing: preserve the comparison. Explanatory decision aid. Numerical examples are hypothetical, not measured product performance or an installation drawing. <a class=\"original-link\" href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2026\/10\/decision-map-3.svg\">View original image<\/a><\/figcaption><\/figure>\n<\/section>\n<section id=\"pairing-test\">\n<h2><span class=\"ez-toc-section\" id=\"Run_a_controlled_baseline_and_candidate_comparison\"><\/span>Run a controlled baseline and candidate comparison<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Freeze the supply revision, output setting, load state, input conditions, enclosure, cable routes and test arrangement. Change the intended filter configuration and its necessary installation details, documenting those changes. Keep a baseline record so the comparison can be repeated if a later production unit behaves differently.<\/p>\n<div class=\"table-scroll\">\n<div class=\"table-wrap\" role=\"region\" aria-label=\"Data table\" tabindex=\"0\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Record<\/th>\n<th scope=\"col\">Baseline panel<\/th>\n<th scope=\"col\">Panel with candidate filter<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Konfigurasi<\/td>\n<td>Supply, loads, bonding and cables identified.<\/td>\n<td>Filter part\/revision and installation drawing added.<\/td>\n<\/tr>\n<tr>\n<td>Emissions result<\/td>\n<td>Trace\/report, mode, band and operating state.<\/td>\n<td>Same comparison conditions; record every relevant result.<\/td>\n<\/tr>\n<tr>\n<td>Function and startup<\/td>\n<td>Receiver behavior and startup event recorded.<\/td>\n<td>Repeat at the defined demanding input\/load states.<\/td>\n<\/tr>\n<tr>\n<td>Thermal observation<\/td>\n<td>Supply and enclosure conditions identified.<\/td>\n<td>Filter temperature assessed against its own limits.<\/td>\n<\/tr>\n<tr>\n<td>Leakage \/ protective-conductor review<\/td>\n<td>Applicable method, result and circuit identified.<\/td>\n<td>Repeat for the complete modified assembly.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p>Judge the candidate against the applicable requirement and the machine&#8217;s functional criteria, not merely whether one peak becomes lower. If a change improves one band but worsens another or changes startup behavior, keep both results in the decision record.<\/p>\n<\/section>\n<section id=\"leakage-and-release\">\n<h2><span class=\"ez-toc-section\" id=\"Keep_leakage_evidence_with_the_final_assembly\"><\/span>Keep leakage evidence with the final assembly<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>TDK&#8217;s technical guidance treats the stated filter leakage figure as a comparison aid and calls for evaluation of the complete equipment or installation with the applicable measurement method. Therefore, a simple sum of component catalogue values is a screening budget, not the completed assembly result. Preserve protective-earth provisions; do not disconnect a protective conductor as an interference remedy. See the <a href=\"https:\/\/www.tdk-electronics.tdk.com\/download\/3107934\/7f30b0110a521bb506ace36f0c56af5c\/pdf-technical-information.pdf\" target=\"_blank\" rel=\"noopener\">TDK discussion of leakage-current evaluation<\/a>.<\/p>\n<p>Record the filter variant, its leakage-data conditions, other relevant components, the protective device and the result from the qualified final-equipment evaluation. Do not select or uprate an RCD solely to hide unexplained trips. Any protective-device decision belongs in the equipment&#8217;s electrical design and applicable requirements review.<\/p>\n<p>Release the pairing with its exact configuration, report references and limits. Reopen it when filter capacitors or variants, the power supply, cabinet bonding, cable routing or connected equipment changes. The useful purchasing description is an approved part and installation revision backed by a pairing record, rather than \u201cadd a good EMI filter.\u201d<\/p>\n<\/section>\n<section id=\"project-record\">\n<h2><span class=\"ez-toc-section\" id=\"Use_the_project_record\"><\/span>Use the project record<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"\/ms\/acceptance-record.html\/\">Open the blank MDR-60-12 and AC EMI filter pairing record<\/a> to record your conditions, evidence and decisions. The worksheet contains no pre-approved result.<\/p>\n<\/section>\n<section class=\"cta\" id=\"project-review\">\n<p>For an <a href=\"https:\/\/www.wehopower.com\/ms\/product\/wholesale-60w-single-output-din-rail-power-power-supply\/\">MDR-60-12 panel<\/a>, send WEHO and the proposed filter supplier the input conditions, load states, layout and actual test concern. Request the current supply documentation and the filter&#8217;s application limits before freezing the pair.<\/p>\n<\/section>\n<section class=\"sources\" id=\"sources\">\n<h2><span class=\"ez-toc-section\" id=\"Sources_and_further_reading\"><\/span>Sources and further reading<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li><a href=\"https:\/\/www.wehopower.com\/ms\/product\/wholesale-60w-single-output-din-rail-power-power-supply\/\">WEHO MDR-60 product information and final-equipment EMC note<\/a><\/li>\n<li><a href=\"https:\/\/www.wehopower.com\/wp-content\/uploads\/2021\/11\/MDR-60.pdf\">WEHO MDR-60 official specification sheet<\/a><\/li>\n<li><a href=\"https:\/\/www.tdk-electronics.tdk.com\/download\/3107934\/7f30b0110a521bb506ace36f0c56af5c\/pdf-technical-information.pdf\" target=\"_blank\" rel=\"noopener\">TDK EMC filters technical information, rated current and leakage sections<\/a><\/li>\n<li><a href=\"https:\/\/www.schurter.com\/en\/knowledge\/measurment-method-for-emc-filter\" target=\"_blank\" rel=\"noopener\">SCHURTER measurement method for EMC filters<\/a><\/li>\n<\/ol>\n<\/section>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>An AC filter is part of a specific panel configuration. Define the emissions problem, input duty and leakage review before choosing a filter for an MDR-60-12 supply.<\/p>","protected":false},"author":2,"featured_media":20352,"parent":0,"menu_order":77,"comment_status":"","ping_status":"","template":"","format":"standard","meta":{"_acf_changed":false,"_joinchat":[],"footnotes":""},"news_category":[284],"class_list":["post-20374","news","type-news","status-publish","format-standard","has-post-thumbnail","hentry","news_category-product-articles","entry"],"acf":[],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.wehopower.com\/ms\/wp-json\/wp\/v2\/news\/20374","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wehopower.com\/ms\/wp-json\/wp\/v2\/news"}],"about":[{"href":"https:\/\/www.wehopower.com\/ms\/wp-json\/wp\/v2\/types\/news"}],"author":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ms\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ms\/wp-json\/wp\/v2\/comments?post=20374"}],"version-history":[{"count":0,"href":"https:\/\/www.wehopower.com\/ms\/wp-json\/wp\/v2\/news\/20374\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wehopower.com\/ms\/wp-json\/wp\/v2\/media\/20352"}],"wp:attachment":[{"href":"https:\/\/www.wehopower.com\/ms\/wp-json\/wp\/v2\/media?parent=20374"}],"wp:term":[{"taxonomy":"news_category","embeddable":true,"href":"https:\/\/www.wehopower.com\/ms\/wp-json\/wp\/v2\/news_category?post=20374"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}