{"id":3653,"date":"2025-07-18T08:28:00","date_gmt":"2025-07-18T00:28:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=3653"},"modified":"2025-07-17T19:54:51","modified_gmt":"2025-07-17T11:54:51","slug":"how-to-test-resistors-on-a-pcb-board","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/","title":{"rendered":"Hvordan tester man modstande p\u00e5 et printkort?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Indholdsfortegnelse<\/p>\n<span class=\"ez-toc-title-toggle\"><\/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.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#1_Safety_Preparations\" >1. Sikkerhedsforberedelser<\/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.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#2_Multimeter_Selection\" >2. Valg af multimeter<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#Recommended_Digital_Multimeter_Specifications\" >Anbefalede specifikationer for digitale multimetre<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#Range_Selection_Guidelines\" >Retningslinjer for valg af omr\u00e5de<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#3_Key_Measurement_Techniques\" >3. Vigtige m\u00e5leteknikker<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#Offline_Measurement_Recommended_Method\" >Offline-m\u00e5ling (anbefalet metode)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#Online_Measurement_Emergency_Method\" >Online-m\u00e5ling (n\u00f8dmetode)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#4_Error_Analysis_and_Quality_Control\" >4. Fejlanalyse og kvalitetskontrol<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#Common_Error_Sources\" >Almindelige fejlkilder<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#Quality_Assessment_Standards\" >Standarder for kvalitetsvurdering<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#5_Advanced_Application_Techniques\" >5. Avancerede anvendelsesteknikker<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#Precision_Resistor_Measurement\" >Pr\u00e6cisionsm\u00e5ling af modstande<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#Special_Resistor_Testing\" >Test af s\u00e6rlige modstande<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/how-to-test-resistors-on-a-pcb-board\/#Batch_Testing_Solutions\" >Batch-testl\u00f8sninger<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Safety_Preparations\"><\/span>1. Sikkerhedsforberedelser<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Sikkerhed har altid h\u00f8jeste prioritet, n\u00e5r man udf\u00f8rer elektroniske m\u00e5linger. For PCB <a href=\"https:\/\/www.topfastpcb.com\/da\/blog\/the-resistor\/\">Modstand<\/a> testning, skal du:<\/p><ul class=\"wp-block-list\"><li><strong>Fuldst\u00e6ndig afbrydelse af str\u00f8mmen<\/strong>: Tag alle str\u00f8mkilder ud af stikkontakten, inklusive batterier og str\u00f8mforsyninger.<\/li>\n\n<li><strong>Behandling ved udskrivning<\/strong>: Aflad kondensatorer med h\u00f8j kapacitet (brug en 10k\u03a9\/5W-modstand til afladning)<\/li>\n\n<li><strong>ESD-beskyttelse<\/strong>: B\u00e6r et antistatisk armb\u00e5nd, og brug en antistatisk m\u00e5tte p\u00e5 arbejdsbordet.<\/li>\n\n<li><strong>Milj\u00f8tjek<\/strong>: S\u00f8rg for, at arbejdsomr\u00e5det er t\u00f8rt, godt ventileret og har en relativ luftfugtighed p\u00e5 30-70%.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Professionelt tip: For h\u00f8jsp\u00e6ndingskredsl\u00f8b (&gt;60V) skal du vente mindst 5 minutter for at sikre fuldst\u00e6ndig afladning, f\u00f8r du forts\u00e6tter.<\/p><\/blockquote><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors.jpg\" alt=\"testmodstande\" class=\"wp-image-3654\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Multimeter_Selection\"><\/span>2. Valg af multimeter<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Valget af det rigtige m\u00e5leinstrument har direkte indflydelse p\u00e5 testresultaternes n\u00f8jagtighed:<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Recommended_Digital_Multimeter_Specifications\"><\/span>Anbefalede specifikationer for digitale multimetre<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Grundl\u00e6ggende krav<\/strong>:<\/li>\n\n<li>N\u00f8jagtighed: Mindst \u00b10,5% + 3 cifre<\/li>\n\n<li>Modstandsomr\u00e5de: 200\u03a9 - 20M\u03a9<\/li>\n\n<li>Teststr\u00f8m: &lt;1mA (for at undg\u00e5 at beskadige f\u00f8lsomme komponenter)<\/li>\n\n<li><strong>Avancerede indstillinger<\/strong>:<\/li>\n\n<li>4-tr\u00e5ds Kelvin-m\u00e5ling (eliminerer effekter af ledningsresistens)<\/li>\n\n<li>Mulighed for automatisk r\u00e6kkevidde<\/li>\n\n<li>Datalogningsfunktion<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Range_Selection_Guidelines\"><\/span>Retningslinjer for valg af omr\u00e5de<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Nominel modstand<\/th><th>Anbefalet r\u00e6kkevidde<\/th><th>Opl\u00f8sning<\/th><\/tr><\/thead><tbody><tr><td>&lt;200\u03a9<\/td><td>200\u03a9 r\u00e6kkevidde<\/td><td>0.1\u03a9<\/td><\/tr><tr><td>200\u03a9-2k\u03a9<\/td><td>2k\u03a9 r\u00e6kkevidde<\/td><td>1\u03a9<\/td><\/tr><tr><td>2k\u03a9-20k\u03a9<\/td><td>20k\u03a9 r\u00e6kkevidde<\/td><td>10\u03a9<\/td><\/tr><tr><td>&gt;20k\u03a9<\/td><td>Automatisk r\u00e6kkevidde<\/td><td>&#8211;<\/td><\/tr><\/tbody><\/table><\/figure><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-3.jpg\" alt=\"testmodstande\" class=\"wp-image-3655\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-3.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-3-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-3-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Key_Measurement_Techniques\"><\/span>3. Vigtige m\u00e5leteknikker<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Offline_Measurement_Recommended_Method\"><\/span>Offline-m\u00e5ling (anbefalet metode)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Isolering af komponenter<\/strong>:<\/li><\/ul><ul class=\"wp-block-list\"><li>Brug en aflodningspumpe eller varmluftspistol til at fjerne den ene ende af modstanden<\/li>\n\n<li>For SMD-modstande, l\u00f8ft forsigtigt den ene ende med en pincet<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Kontaktmetode<\/strong>:<\/li><\/ul><ul class=\"wp-block-list\"><li>Modstande med gennemg\u00e5ende hul: Placer proberne vinkelret p\u00e5 ledningerne<\/li>\n\n<li>SMD-modstande: Brug fintm\u00e6rkende prober (0,5 mm diameter er ideelt)<\/li>\n\n<li>Miniaturekomponenter: Det anbefales at bruge testkroge<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Fortolkning af l\u00e6sning<\/strong>:<\/li><\/ul><ul class=\"wp-block-list\"><li>Normal v\u00e6rdi: Inden for \u00b1 tolerance af nominel v\u00e6rdi<\/li>\n\n<li>Unormale forhold:<ul class=\"wp-block-list\"><li>\"OL\"-visning: Fejl i \u00e5bent kredsl\u00f8b<\/li>\n\n<li>T\u00e6t p\u00e5 0\u03a9: Kortslutningsfejl<\/li>\n\n<li>Ustabile udsving: Intern d\u00e5rlig kontakt<\/li><\/ul><\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Online_Measurement_Emergency_Method\"><\/span>Online-m\u00e5ling (n\u00f8dmetode)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Analyse af \u00e6kvivalente kredsl\u00f8b<\/strong>:<br>Tegn et delvist kredsl\u00f8bsdiagram, beregn den parallelle \u00e6kvivalente modstand<\/li>\n\n<li><strong>Metode til sp\u00e6ndingsfald<\/strong>:<br>M\u00e5l sp\u00e6ndingen (V) over modstanden, brug den kendte str\u00f8m (I) til at beregne R=V\/I<\/li>\n\n<li><strong>Sammenligningsmetode<\/strong>:<br>M\u00e5l identiske modstande i samme kredsl\u00f8b som reference<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Error_Analysis_and_Quality_Control\"><\/span>4. Fejlanalyse og kvalitetskontrol<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Error_Sources\"><\/span>Almindelige fejlkilder<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Fejltype<\/th><th>Indvirkningsniveau<\/th><th>L\u00f8sning<\/th><\/tr><\/thead><tbody><tr><td>Kontaktmodstand<\/td><td>\u00b1(1-10\u03a9)<\/td><td>Brug en m\u00e5ling med 4 ledninger<\/td><\/tr><tr><td>Temperaturdrift<\/td><td>\u00b10,4%\/\u00b0C<\/td><td>Registrer den omgivende temperatur, og kompens\u00e9r<\/td><\/tr><tr><td>EMI-forstyrrelser<\/td><td>Tilf\u00e6ldig fejl<\/td><td>Brug afsk\u00e6rmede testledninger<\/td><\/tr><tr><td>Oxidation af sonde<\/td><td>+5% fejl<\/td><td>Reng\u00f8r probespidserne regelm\u00e6ssigt<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quality_Assessment_Standards\"><\/span>Standarder for kvalitetsvurdering<span class=\"ez-toc-section-end\"><\/span><\/h3><p>I henhold til IPC-A-600G-standarden:<\/p><ul class=\"wp-block-list\"><li>Best\u00e5et: M\u00e5lt v\u00e6rdi inden for \u00b110% af nominel v\u00e6rdi (standardmodstande)<\/li>\n\n<li>Fejl:<\/li>\n\n<li>Modstand overstiger \u00b110%<\/li>\n\n<li>Ustabile m\u00e5linger (&gt;5% variation)<\/li>\n\n<li>Fysiske skader (revner, br\u00e6ndem\u00e6rker osv.)<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-2.jpg\" alt=\"testmodstande\" class=\"wp-image-3656\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/test-resistors-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Advanced_Application_Techniques\"><\/span>5. Avancerede anvendelsesteknikker<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Precision_Resistor_Measurement\"><\/span>Pr\u00e6cisionsm\u00e5ling af modstande<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Konstant str\u00f8m-metoden: Brug en 1mA str\u00f8mkilde + et h\u00f8jpr\u00e6cisionsvoltmeter<\/li>\n\n<li>Temperaturkompensation: Registrer omgivelsestemperaturen, konverter med formlen R25=Rt\/[1+\u03b1(T-25)].<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Special_Resistor_Testing\"><\/span>Test af s\u00e6rlige modstande<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Smeltbare modstande<\/strong>: Kr\u00e6ver overstr\u00f8mstest efter m\u00e5ling<\/li>\n\n<li><strong>NTC\/PTC<\/strong>: M\u00e5l modstandskurven ved forskellige temperaturer<\/li>\n\n<li><strong>H\u00f8jsp\u00e6ndingsmodstande<\/strong>: Brug en isolationstester (500V DC)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Batch_Testing_Solutions\"><\/span>Batch-testl\u00f8sninger<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Automatiseret testfikstur + multiplex-scanner<\/li>\n\n<li>Statistisk analyse af CPK-v\u00e6rdier (krav &gt;1,33)<\/li><\/ul>","protected":false},"excerpt":{"rendered":"<p>En professionel metode til test af PCB-modstande ved hj\u00e6lp af et multimeter, der d\u00e6kker sikkerhedsstandarder, instrumentvalg og specifikke m\u00e5letrin. Denne detaljerede analyse omfatter offline\/online-m\u00e5leteknikker, analyse af fejlkilder og kriterier for kvalitetsvurdering i overensstemmelse med IPC-standarder samt teknikker til pr\u00e6cisionsm\u00e5ling af modstande og l\u00f8sninger til batch-testning.<\/p>","protected":false},"author":1,"featured_media":3657,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[109],"tags":[325,324],"class_list":["post-3653","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq","tag-resistors","tag-test-resistors"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to test resistors on a PCB board? - Topfastpcb<\/title>\n<meta name=\"description\" content=\"PCB Resistor Testing Methods: Multimeter Measurement, Error Analysis Methods, and Quality Control Standards. 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