{"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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/","title":{"rendered":"Como testar resist\u00eancias numa placa de circuito impresso?"},"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\">\u00cdndice<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#1_Safety_Preparations\" >1. Preparativos de seguran\u00e7a<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#2_Multimeter_Selection\" >2. Sele\u00e7\u00e3o do mult\u00edmetro<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#Recommended_Digital_Multimeter_Specifications\" >Especifica\u00e7\u00f5es recomendadas para o mult\u00edmetro digital<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#Range_Selection_Guidelines\" >Orienta\u00e7\u00f5es para a sele\u00e7\u00e3o da gama<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#3_Key_Measurement_Techniques\" >3. Principais t\u00e9cnicas de medi\u00e7\u00e3o<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#Offline_Measurement_Recommended_Method\" >Medi\u00e7\u00e3o offline (m\u00e9todo recomendado)<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#Online_Measurement_Emergency_Method\" >Medi\u00e7\u00e3o em linha (m\u00e9todo de emerg\u00eancia)<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#4_Error_Analysis_and_Quality_Control\" >4. An\u00e1lise de erros e controlo de qualidade<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#Common_Error_Sources\" >Fontes de erro comuns<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#Quality_Assessment_Standards\" >Normas de avalia\u00e7\u00e3o da qualidade<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#5_Advanced_Application_Techniques\" >5. T\u00e9cnicas avan\u00e7adas de aplica\u00e7\u00e3o<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#Precision_Resistor_Measurement\" >Medi\u00e7\u00e3o de precis\u00e3o de resist\u00eancias<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#Special_Resistor_Testing\" >Teste de resist\u00eancias especiais<\/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\/pt\/blog\/how-to-test-resistors-on-a-pcb-board\/#Batch_Testing_Solutions\" >Solu\u00e7\u00f5es de teste de lotes<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Safety_Preparations\"><\/span>1. Preparativos de seguran\u00e7a<span class=\"ez-toc-section-end\"><\/span><\/h2><p>A seguran\u00e7a \u00e9 sempre a principal prioridade quando se realizam quaisquer medi\u00e7\u00f5es electr\u00f3nicas. Para PCB <a href=\"https:\/\/www.topfastpcb.com\/pt\/blog\/the-resistor\/\">resist\u00eancia<\/a> testes, tem de o fazer:<\/p><ul class=\"wp-block-list\"><li><strong>Desconex\u00e3o completa da alimenta\u00e7\u00e3o<\/strong>: Desligue todas as fontes de alimenta\u00e7\u00e3o, incluindo pilhas e adaptadores de corrente<\/li>\n\n<li><strong>Tratamento de alta<\/strong>: Descarregar condensadores de elevada capacidade (utilizar uma resist\u00eancia de 10k\u03a9\/5W para a descarga)<\/li>\n\n<li><strong>Prote\u00e7\u00e3o ESD<\/strong>: Usar uma pulseira anti-est\u00e1tica e utilizar um tapete anti-est\u00e1tico na bancada de trabalho<\/li>\n\n<li><strong>Controlo ambiental<\/strong>: Assegurar que o espa\u00e7o de trabalho est\u00e1 seco, bem ventilado e mant\u00e9m uma humidade relativa de 30-70%<\/li><\/ul><blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Sugest\u00e3o profissional: Para placas de circuito de alta tens\u00e3o (&gt;60V), esperar pelo menos 5 minutos para garantir a descarga completa antes de prosseguir<\/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=\"resist\u00eancias de teste\" 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. Sele\u00e7\u00e3o do mult\u00edmetro<span class=\"ez-toc-section-end\"><\/span><\/h2><p>A escolha do instrumento de medi\u00e7\u00e3o correto tem um impacto direto na precis\u00e3o dos resultados dos testes:<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Recommended_Digital_Multimeter_Specifications\"><\/span>Especifica\u00e7\u00f5es recomendadas para o mult\u00edmetro digital<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Requisitos b\u00e1sicos<\/strong>:<\/li>\n\n<li>Precis\u00e3o: Pelo menos \u00b10,5% + 3 d\u00edgitos<\/li>\n\n<li>Gama de resist\u00eancia: 200\u03a9 - 20M\u03a9<\/li>\n\n<li>Corrente de teste: &lt;1mA (para evitar danificar componentes sens\u00edveis)<\/li>\n\n<li><strong>Op\u00e7\u00f5es avan\u00e7adas<\/strong>:<\/li>\n\n<li>Medi\u00e7\u00e3o Kelvin a 4 fios (elimina os efeitos da resist\u00eancia do cabo)<\/li>\n\n<li>Capacidade de auto-alimenta\u00e7\u00e3o<\/li>\n\n<li>Fun\u00e7\u00e3o de registo de dados<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Range_Selection_Guidelines\"><\/span>Orienta\u00e7\u00f5es para a sele\u00e7\u00e3o da gama<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Resist\u00eancia nominal<\/th><th>Gama recomendada<\/th><th>Resolu\u00e7\u00e3o<\/th><\/tr><\/thead><tbody><tr><td>&lt;200\u03a9<\/td><td>Gama de 200\u03a9<\/td><td>0.1\u03a9<\/td><\/tr><tr><td>200\u03a9-2k\u03a9<\/td><td>Gama de 2k\u03a9<\/td><td>1\u03a9<\/td><\/tr><tr><td>2k\u03a9-20k\u03a9<\/td><td>Gama de 20k\u03a9<\/td><td>10\u03a9<\/td><\/tr><tr><td>&gt;20k\u03a9<\/td><td>Auto-alcance<\/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=\"resist\u00eancias de teste\" 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. Principais t\u00e9cnicas de medi\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Offline_Measurement_Recommended_Method\"><\/span>Medi\u00e7\u00e3o offline (m\u00e9todo recomendado)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Isolamento de componentes<\/strong>:<\/li><\/ul><ul class=\"wp-block-list\"><li>Utilize uma bomba de dessoldadura ou uma pistola de ar quente para remover uma extremidade da resist\u00eancia<\/li>\n\n<li>Para resist\u00eancias SMD, levantar suavemente uma extremidade com uma pin\u00e7a<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>M\u00e9todo de contacto<\/strong>:<\/li><\/ul><ul class=\"wp-block-list\"><li>Resist\u00eancias de furo passante: Colocar as sondas perpendicularmente aos cabos<\/li>\n\n<li>Resist\u00eancias SMD: Utilizar sondas de ponta fina (di\u00e2metro de 0,5 mm ideal)<\/li>\n\n<li>Componentes em miniatura: Recomenda-se a utiliza\u00e7\u00e3o de ganchos de teste<\/li><\/ul><ul class=\"wp-block-list\"><li><strong>Interpreta\u00e7\u00e3o de leitura<\/strong>:<\/li><\/ul><ul class=\"wp-block-list\"><li>Valor normal: Dentro de \u00b1 toler\u00e2ncia do valor nominal<\/li>\n\n<li>Condi\u00e7\u00f5es an\u00f3malas:<ul class=\"wp-block-list\"><li>Ecr\u00e3 \"OL\": Falha de circuito aberto<\/li>\n\n<li>Perto de 0\u03a9: Falha de curto-circuito<\/li>\n\n<li>Flutua\u00e7\u00e3o inst\u00e1vel: Mau contacto interno<\/li><\/ul><\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Online_Measurement_Emergency_Method\"><\/span>Medi\u00e7\u00e3o em linha (m\u00e9todo de emerg\u00eancia)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>An\u00e1lise de circuitos equivalentes<\/strong>:<br>Desenhar um diagrama parcial do circuito, calcular a resist\u00eancia equivalente em paralelo<\/li>\n\n<li><strong>M\u00e9todo de queda de tens\u00e3o<\/strong>:<br>Medir a tens\u00e3o (V) atrav\u00e9s da resist\u00eancia, utilizar a corrente (I) conhecida para calcular R=V\/I<\/li>\n\n<li><strong>M\u00e9todo de compara\u00e7\u00e3o<\/strong>:<br>Medir resist\u00eancias id\u00eanticas no mesmo circuito como refer\u00eancia<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Error_Analysis_and_Quality_Control\"><\/span>4. An\u00e1lise de erros e controlo de qualidade<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Error_Sources\"><\/span>Fontes de erro comuns<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Tipo de erro<\/th><th>N\u00edvel de impacto<\/th><th>Solu\u00e7\u00e3o<\/th><\/tr><\/thead><tbody><tr><td>Resist\u00eancia de contacto<\/td><td>\u00b1(1-10\u03a9)<\/td><td>Utilizar uma medi\u00e7\u00e3o a 4 fios<\/td><\/tr><tr><td>Desvio de temperatura<\/td><td>\u00b10,4%\/\u00b0C<\/td><td>Registar a temperatura ambiente e compensar<\/td><\/tr><tr><td>Interfer\u00eancia EMI<\/td><td>Erro aleat\u00f3rio<\/td><td>Utilizar cabos de teste blindados<\/td><\/tr><tr><td>Oxida\u00e7\u00e3o da sonda<\/td><td>Erro +5%<\/td><td>Limpar regularmente as pontas de sonda<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Quality_Assessment_Standards\"><\/span>Normas de avalia\u00e7\u00e3o da qualidade<span class=\"ez-toc-section-end\"><\/span><\/h3><p>De acordo com a norma IPC-A-600G:<\/p><ul class=\"wp-block-list\"><li>Passa: Valor medido dentro de \u00b110% do valor nominal (resist\u00eancias padr\u00e3o)<\/li>\n\n<li>Falha:<\/li>\n\n<li>A resist\u00eancia excede \u00b110%<\/li>\n\n<li>Leituras inst\u00e1veis (varia\u00e7\u00e3o &gt;5%)<\/li>\n\n<li>Danos f\u00edsicos (fissuras, marcas de queimaduras, etc.)<\/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=\"resist\u00eancias de teste\" 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. T\u00e9cnicas avan\u00e7adas de aplica\u00e7\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Precision_Resistor_Measurement\"><\/span>Medi\u00e7\u00e3o de precis\u00e3o de resist\u00eancias<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>M\u00e9todo de corrente constante: Utilizar uma fonte de corrente de 1mA + um volt\u00edmetro de alta precis\u00e3o<\/li>\n\n<li>Compensa\u00e7\u00e3o de temperatura: Registar a temperatura ambiente, converter utilizando a f\u00f3rmula R25=Rt\/[1+\u03b1(T-25)]<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Special_Resistor_Testing\"><\/span>Teste de resist\u00eancias especiais<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Resist\u00eancias Fus\u00edveis<\/strong>: Requer teste de sobrecorrente ap\u00f3s a medi\u00e7\u00e3o<\/li>\n\n<li><strong>NTC\/PTC<\/strong>: Medir a curva de resist\u00eancia a diferentes temperaturas<\/li>\n\n<li><strong>Resist\u00eancias de alta tens\u00e3o<\/strong>: Utilizar um aparelho de teste de isolamento (500V DC)<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Batch_Testing_Solutions\"><\/span>Solu\u00e7\u00f5es de teste de lotes<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Dispositivo de teste automatizado + scanner multiplex<\/li>\n\n<li>An\u00e1lise estat\u00edstica dos valores de CPK (requisito &gt;1,33)<\/li><\/ul>","protected":false},"excerpt":{"rendered":"<p>Um m\u00e9todo profissional para testar resist\u00eancias de PCB utilizando um mult\u00edmetro, abrangendo normas de seguran\u00e7a, sele\u00e7\u00e3o de instrumentos e passos de medi\u00e7\u00e3o espec\u00edficos. Esta an\u00e1lise detalhada inclui t\u00e9cnicas de medi\u00e7\u00e3o offline\/online, an\u00e1lise de fontes de erro e crit\u00e9rios de avalia\u00e7\u00e3o de qualidade de acordo com as normas IPC, bem como t\u00e9cnicas de medi\u00e7\u00e3o de resist\u00eancias de precis\u00e3o e solu\u00e7\u00f5es de teste de lotes.<\/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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