{"id":6309,"date":"2021-03-21T16:00:29","date_gmt":"2021-03-21T16:00:29","guid":{"rendered":"https:\/\/ct1jqj.eu\/blog\/?p=6309"},"modified":"2021-03-21T16:00:29","modified_gmt":"2021-03-21T16:00:29","slug":"ponta-de-prova-hv-10001-pt-2","status":"publish","type":"post","link":"https:\/\/ct1jqj.eu\/?p=6309","title":{"rendered":"Ponta de prova HV 1000:1 (Pt. 2)"},"content":{"rendered":"<div class=\"pld-like-dislike-wrap pld-template-4\">\r\n    <div class=\"pld-like-wrap  pld-common-wrap\">\r\n    <a href=\"javascript:void(0)\" class=\"pld-like-trigger pld-like-dislike-trigger  \" title=\"\" data-post-id=\"6309\" data-trigger-type=\"like\" data-restriction=\"cookie\" data-already-liked=\"0\">\r\n                        <i class=\"far fa-smile\"><\/i>\r\n                    <\/a>\r\n    <span class=\"pld-like-count-wrap pld-count-wrap\">4    <\/span>\r\n<\/div><div class=\"pld-dislike-wrap  pld-common-wrap\">\r\n    <a href=\"javascript:void(0)\" class=\"pld-dislike-trigger pld-like-dislike-trigger  \" title=\"\" data-post-id=\"6309\" data-trigger-type=\"dislike\" data-restriction=\"cookie\" data-already-liked=\"0\">\r\n                        <i class=\"far fa-frown\"><\/i>\r\n                    <\/a>\r\n    <span class=\"pld-dislike-count-wrap pld-count-wrap\"><\/span>\r\n<\/div><\/div><p style=\"text-align: justify;\">Ap\u00f3s recep\u00e7\u00e3o das placas, m\u00e3os \u00e0 obra. Faltava uma das liga\u00e7\u00f5es s\u00e9rie das resist\u00eancias, mas foi de f\u00e1cil resolu\u00e7\u00e3o (A culpa foi de quem estava entre a secret\u00e1ria e o computador que se esqueceu de desenhar a liga\u00e7\u00e3o enquanto verificava a PCB&#8230;). Placas quando chegaram, j\u00e1 com algumas resist\u00eancias soldadas&#8230; e ainda o erro corrigido!<\/p>\n\n\t\t<style>\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-6309 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=6313'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2021\/03\/photo_2021-03-21_15-18-22-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=6314'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2021\/03\/photo_2021-03-21_15-18-27-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=6315'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2021\/03\/photo_2021-03-21_15-18-30-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<p style=\"text-align: justify;\">Feitas as primeiras medi\u00e7\u00f5es, e uma vez que n\u00e3o usei resist\u00eancias de precis\u00e3o (J\u00e1 que a primeira placa seria essencialmente de testes para futuras melhorias) as medidas n\u00e3o batiam de todo certo (O conjunto que deveria ser de 800M\u03a9 rondava os 780M\u03a9). Acabei por alterar um pouco os valores das resist\u00eancias do divisor de tens\u00e3o e ap\u00f3s isso as medidas ficaram certas. Para a vers\u00e3o 3.1 destas PCB (Al\u00e9m de corrigir a liga\u00e7\u00e3o) irei ter em conta outros factores, nomeadamente espa\u00e7o para mais uma resist\u00eancia em cada fileira da s\u00e9rie (Caso seja necess\u00e1rio compensar) e eventualmente utilizar mais um <em>trimmer<\/em> de valor menor sendo que o existente permitir\u00e1 uma regula\u00e7\u00e3o &#8220;grossa&#8221; e o outro ser\u00e1 ajustado para ajuste &#8220;fino&#8221;. Utilizei o <em>megger<\/em> <a href=\"http:\/\/192.168.40.100\/?p=6136\" target=\"_blank\" rel=\"noopener\">BM500A<\/a> como fonte de alta tens\u00e3o<a href=\"http:\/\/192.168.40.100\/?p=6136\" target=\"_blank\" rel=\"noopener\">,<\/a> que n\u00e3o sendo o melhor para o efeito, d\u00e1 para ter uma ideia. A seguir uma tabela com os valores medidos e os valores obtidos ap\u00f3s divis\u00e3o. Como se pode ver o erro de medi\u00e7\u00e3o \u00e9 m\u00ednimo.<\/p>\n<table style=\"height: 119px;\" width=\"586\">\n<tbody>\n<tr>\n<td width=\"135\">Real (V)<\/td>\n<td width=\"105\">268<\/td>\n<td width=\"105\">499<\/td>\n<td width=\"105\">946<\/td>\n<\/tr>\n<tr>\n<td>Medido (mV)<\/td>\n<td>267<\/td>\n<td>499<\/td>\n<td>945<\/td>\n<\/tr>\n<tr>\n<td>Diferen\u00e7a<\/td>\n<td>1,00%<\/td>\n<td>0,00%<\/td>\n<td>1,00%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: justify;\">Como j\u00e1 referi antes, na casa dos KV mais volt menos volt n\u00e3o se nota, como tal o conjunto ser\u00e1 colocado numa caixa quando tiver um pouco mais tempo e quem sabe, tentarei na altura (Ou depois!) efectuar novos testes com uma fonte de alta tens\u00e3o. Quando as resist\u00eancias de precis\u00e3o chegarem e o tempo permitir, farei novos testes.<\/p>\n<p>73&#8217;s<\/p>\n","protected":false},"excerpt":{"rendered":"<p>4 Ap\u00f3s recep\u00e7\u00e3o das placas, m\u00e3os \u00e0 obra. Faltava uma das liga\u00e7\u00f5es s\u00e9rie das resist\u00eancias, mas foi de f\u00e1cil resolu\u00e7\u00e3o (A culpa foi de quem estava entre a secret\u00e1ria e o computador que se esqueceu de desenhar a liga\u00e7\u00e3o enquanto verificava a PCB&#8230;). Placas quando chegaram, j\u00e1 com algumas resist\u00eancias soldadas&#8230; e ainda o erro [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4346,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,9],"tags":[188,228],"class_list":["post-6309","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-equipamento","category-ideias-para-projecto","tag-hv","tag-megger"],"_links":{"self":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/posts\/6309","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6309"}],"version-history":[{"count":0,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/posts\/6309\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/media\/4346"}],"wp:attachment":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6309"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6309"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}