{"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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/","title":{"rendered":"Miten testata vastukset PCB-levyll\u00e4?"},"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\">Sis\u00e4llysluettelo<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#1_Safety_Preparations\" >1. Turvallisuusvalmistelut<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#2_Multimeter_Selection\" >2. Yleismittarin valinta<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#Recommended_Digital_Multimeter_Specifications\" >Suositellut digitaalisen yleismittarin tekniset tiedot<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#Range_Selection_Guidelines\" >Valikoiman valintaohjeet<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#3_Key_Measurement_Techniques\" >3. T\u00e4rkeimm\u00e4t mittaustekniikat<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#Offline_Measurement_Recommended_Method\" >Offline-mittaus (suositeltava menetelm\u00e4)<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#Online_Measurement_Emergency_Method\" >Online-mittaus (h\u00e4t\u00e4menetelm\u00e4)<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#4_Error_Analysis_and_Quality_Control\" >4. Virheanalyysi ja laadunvalvonta<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#Common_Error_Sources\" >Yleiset virhel\u00e4hteet<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#Quality_Assessment_Standards\" >Laadunarviointistandardit<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#5_Advanced_Application_Techniques\" >5. Edistyneet sovellustekniikat<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#Precision_Resistor_Measurement\" >Tarkkuusresistorin mittaus<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#Special_Resistor_Testing\" >Erikoisvastusten testaus<\/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\/fi\/blog\/how-to-test-resistors-on-a-pcb-board\/#Batch_Testing_Solutions\" >Er\u00e4testausratkaisut<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Safety_Preparations\"><\/span>1. Turvallisuusvalmistelut<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Turvallisuus on aina etusijalla s\u00e4hk\u00f6isi\u00e4 mittauksia teht\u00e4ess\u00e4. PCB <a href=\"https:\/\/www.topfastpcb.com\/fi\/blog\/the-resistor\/\">vastus<\/a> testaaminen, sinun t\u00e4ytyy:<\/p><ul class=\"wp-block-list\"><li><strong>T\u00e4ydellinen virran katkaisu<\/strong>: Irrota kaikki virtal\u00e4hteet, mukaan lukien paristot ja verkkolaitteet.<\/li>\n\n<li><strong>Vastuuvapauden hoito<\/strong>: Tyhjenn\u00e4 suurikapasiteettiset kondensaattorit (k\u00e4yt\u00e4 10k\u03a9\/5W vastusta tyhjennyst\u00e4 varten).<\/li>\n\n<li><strong>ESD-suojaus<\/strong>: K\u00e4yt\u00e4 antistaattista ranneketta ja antistaattista mattoa ty\u00f6p\u00f6yd\u00e4ll\u00e4.<\/li>\n\n<li><strong>Ymp\u00e4rist\u00f6n tarkastus<\/strong>: Varmista, ett\u00e4 ty\u00f6tila on kuiva, hyvin tuuletettu ja ett\u00e4 sen suhteellinen kosteus on 30-70%.<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Ammattilaisten vinkki: Korkeaj\u00e4nnitteisten piirilevyjen (&gt;60V) kohdalla odota v\u00e4hint\u00e4\u00e4n 5 minuuttia, jotta varmistetaan t\u00e4ydellinen purkautuminen ennen kuin jatkat.<\/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=\"testivastukset\" 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. Yleismittarin valinta<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Oikean mittauslaitteen valinta vaikuttaa suoraan testitulosten tarkkuuteen:<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Recommended_Digital_Multimeter_Specifications\"><\/span>Suositellut digitaalisen yleismittarin tekniset tiedot<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Perusvaatimukset<\/strong>:<\/li>\n\n<li>Tarkkuus: v\u00e4hint\u00e4\u00e4n \u00b10,5% + 3 numeroa.<\/li>\n\n<li>Vastusalue: 200\u03a9 - 20M\u03a9<\/li>\n\n<li>Testivirta: &lt;1mA (herkkien komponenttien vahingoittumisen v\u00e4ltt\u00e4miseksi).<\/li>\n\n<li><strong>Lis\u00e4asetukset<\/strong>:<\/li>\n\n<li>4-johtiminen Kelvinin mittaus (eliminoi johtimen resistanssin vaikutukset).<\/li>\n\n<li>Automaattinen vaihteluv\u00e4li<\/li>\n\n<li>Tiedonkeruutoiminto<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Range_Selection_Guidelines\"><\/span>Valikoiman valintaohjeet<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Nimellinen vastus<\/th><th>Suositeltu alue<\/th><th>P\u00e4\u00e4t\u00f6slauselma<\/th><\/tr><\/thead><tbody><tr><td>&lt;200\u03a9<\/td><td>200\u03a9 alue<\/td><td>0.1\u03a9<\/td><\/tr><tr><td>200\u03a9-2k\u03a9<\/td><td>2k\u03a9 alue<\/td><td>1\u03a9<\/td><\/tr><tr><td>2k\u03a9-20k\u03a9<\/td><td>20k\u03a9 alue<\/td><td>10\u03a9<\/td><\/tr><tr><td>&gt;20k\u03a9<\/td><td>Automaattinen kantama<\/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=\"testivastukset\" 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. T\u00e4rkeimm\u00e4t mittaustekniikat<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-mittaus (suositeltava menetelm\u00e4)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Komponenttien erist\u00e4minen<\/strong>:<\/li><\/ul><ul class=\"wp-block-list\"><li>Irrota vastuksen toinen p\u00e4\u00e4 juotospumpulla tai kuumailmapuhaltimella.<\/li>\n\n<li>Jos kyseess\u00e4 on SMD-vastus, nostetaan varovasti pinseteill\u00e4 toinen p\u00e4\u00e4.<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Yhteydenottomenetelm\u00e4<\/strong>:<\/li><\/ul><ul class=\"wp-block-list\"><li>L\u00e4pireik\u00e4iset vastukset: Aseta anturit kohtisuoraan johtoja vastaan<\/li>\n\n<li>SMD-vastukset: (0,5 mm halkaisija ihanteellinen).<\/li>\n\n<li>Pienikokoiset komponentit: Suositellaan testikoukkujen k\u00e4ytt\u00f6\u00e4<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Lukemisen tulkinta<\/strong>:<\/li><\/ul><ul class=\"wp-block-list\"><li>Normaaliarvo: \u00b1 toleranssin sis\u00e4ll\u00e4 nimellisarvosta<\/li>\n\n<li>Ep\u00e4normaalit olosuhteet:<ul class=\"wp-block-list\"><li>\"OL\"-n\u00e4ytt\u00f6: Avoimen piirin vika<\/li>\n\n<li>L\u00e4hell\u00e4 0\u03a9: Oikosulun vika<\/li>\n\n<li>Ep\u00e4vakaa vaihtelu: Sis\u00e4inen huono kontakti<\/li><\/ul><\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Online_Measurement_Emergency_Method\"><\/span>Online-mittaus (h\u00e4t\u00e4menetelm\u00e4)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Vastaavuuspiirianalyysi<\/strong>:<br>Piirr\u00e4 osittainen virtapiirikaavio, laske rinnakkainen ekvivalenttinen resistanssi<\/li>\n\n<li><strong>J\u00e4nniteh\u00e4vi\u00f6menetelm\u00e4<\/strong>:<br>Mittaa j\u00e4nnite (V) vastuksen yli ja laske tunnetun virran (I) avulla R=V\/I.<\/li>\n\n<li><strong>Vertailumenetelm\u00e4<\/strong>:<br>Mittaa identtiset vastukset samassa piiriss\u00e4 vertailukohtana.<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Error_Analysis_and_Quality_Control\"><\/span>4. Virheanalyysi ja laadunvalvonta<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Error_Sources\"><\/span>Yleiset virhel\u00e4hteet<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Virhetyyppi<\/th><th>Vaikutustaso<\/th><th>Ratkaisu<\/th><\/tr><\/thead><tbody><tr><td>Kosketusvastus<\/td><td>\u00b1(1-10\u03a9)<\/td><td>K\u00e4yt\u00e4 4-johdinmittausta<\/td><\/tr><tr><td>L\u00e4mp\u00f6tilan ajautuminen<\/td><td>\u00b10.4%\/\u00b0C<\/td><td>Kirjaa ymp\u00e4rist\u00f6n l\u00e4mp\u00f6tila ja kompensoi<\/td><\/tr><tr><td>EMI-h\u00e4iri\u00f6t<\/td><td>Satunnainen virhe<\/td><td>K\u00e4yt\u00e4 suojattuja testijohtoja<\/td><\/tr><tr><td>Koettimen hapettuminen<\/td><td>+5% virhe<\/td><td>Puhdista anturin k\u00e4rjet s\u00e4\u00e4nn\u00f6llisesti<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quality_Assessment_Standards\"><\/span>Laadunarviointistandardit<span class=\"ez-toc-section-end\"><\/span><\/h3><p>IPC-A-600G-standardin mukaisesti:<\/p><ul class=\"wp-block-list\"><li>Pass: Mitattu arvo \u00b110%:n sis\u00e4ll\u00e4 nimellisarvosta (vakiovastukset).<\/li>\n\n<li>Ep\u00e4onnistuminen:<\/li>\n\n<li>Vastus ylitt\u00e4\u00e4 \u00b110%<\/li>\n\n<li>Ep\u00e4vakaat lukemat (&gt;5% vaihtelu)<\/li>\n\n<li>Fyysiset vauriot (halkeamat, paloj\u00e4ljet jne.).<\/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=\"testivastukset\" 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. Edistyneet sovellustekniikat<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Precision_Resistor_Measurement\"><\/span>Tarkkuusresistorin mittaus<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Vakiovirtamenetelm\u00e4: K\u00e4yt\u00e4 1mA:n virtal\u00e4hdett\u00e4 + eritt\u00e4in tarkkaa volttimittaria.<\/li>\n\n<li>L\u00e4mp\u00f6tilan kompensointi: Tallenna ymp\u00e4rist\u00f6n l\u00e4mp\u00f6tila, muunna kaavan R25=Rt\/[1+\u03b1(T-25)] avulla.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Special_Resistor_Testing\"><\/span>Erikoisvastusten testaus<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Sulavat vastukset<\/strong>: Vaatii ylivirtatestin mittauksen j\u00e4lkeen<\/li>\n\n<li><strong>NTC\/PTC<\/strong>: Mittaa vastusk\u00e4yr\u00e4 eri l\u00e4mp\u00f6tiloissa<\/li>\n\n<li><strong>Korkeaj\u00e4nnitevastukset<\/strong>: K\u00e4yt\u00e4 eristystesteri\u00e4 (500V DC).<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Batch_Testing_Solutions\"><\/span>Er\u00e4testausratkaisut<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Automaattinen testauslaite + multiplex-skanneri<\/li>\n\n<li>CPK-arvojen tilastollinen analyysi (vaatimus &gt; 1,33)<\/li><\/ul>","protected":false},"excerpt":{"rendered":"<p>Ammattimainen menetelm\u00e4 piirilevyjen vastusten testaamiseen yleismittarilla, joka kattaa turvallisuusstandardit, laitteen valinnan ja erityiset mittausvaiheet. T\u00e4m\u00e4 yksityiskohtainen analyysi sis\u00e4lt\u00e4\u00e4 offline\/online-mittaustekniikat, virhel\u00e4hteiden analyysin ja laadunarviointikriteerit IPC-standardien mukaisesti sek\u00e4 tarkkuusvastusten mittaustekniikat ja er\u00e4testausratkaisut.<\/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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