{"id":1902,"date":"2018-06-22T09:19:14","date_gmt":"2018-06-22T09:19:14","guid":{"rendered":"http:\/\/www.n\u00f8rdoteket.dk\/?p=1902"},"modified":"2018-06-22T09:19:58","modified_gmt":"2018-06-22T09:19:58","slug":"gds-80mm-h-probe-til-maaling-af-stoej-fra-elektriske-kabler","status":"publish","type":"post","link":"https:\/\/noerdoteket.dk\/index.php\/2018\/06\/22\/gds-80mm-h-probe-til-maaling-af-stoej-fra-elektriske-kabler\/","title":{"rendered":"GDS: 80mm H-probe til m\u00e5ling af st\u00f8j fra elektriske kabler"},"content":{"rendered":"<p>Til mit <a href=\"http:\/\/www.n\u00f8rdoteket.dk\/index.php\/2018\/06\/02\/powerline-performance-tests\/\" target=\"_blank\" rel=\"noopener\">teknologiske deep-dive om PLC teknologi<\/a> havde jeg brug for at m\u00e5le p\u00e5 den st\u00f8j som PLC (og elendige LED p\u00e6rer) introducer p\u00e5 elkabler.<\/p>\n<p><!--more--><\/p>\n<p>Hvis jeg bare tilsluttede elkablet til indgangen p\u00e5 min spectrum analyzer ville al den magiske r\u00f8g slippe ud i \u00e9t stort brag &#8211; og den magiske r\u00f8g i en spectrum analyzer er af den s\u00e6rdeles pebrede slags!<\/p>\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<!-- wp-inpost-add -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-7793103161450012\"\r\n     data-ad-slot=\"1741650889\"\r\n     data-ad-format=\"auto\"><\/ins>\r\n<script>\r\n(adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<p>Skal man m\u00e5le niveauerne p\u00e5 en kalibreret og reproducerbar m\u00e5de, er den korrekte metode at benytte et LISN. LISN st\u00e5r for Line Impedance Stabilisation Network, og er grundl\u00e6ggende et lavpas filter som dels sikrer en kontrolleret\/kendt impedans og dels muligg\u00f8r tilslutningen af m\u00e5leudstyr.<\/p>\n<figure id=\"attachment_1921\" aria-describedby=\"caption-attachment-1921\" style=\"width: 1943px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1cce62564.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1921 size-full\" src=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1cce62564.png\" alt=\"\" width=\"1943\" height=\"1001\" srcset=\"https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1cce62564.png 1943w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1cce62564-300x155.png 300w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1cce62564-768x396.png 768w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1cce62564-1024x528.png 1024w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1cce62564-1200x618.png 1200w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/a><figcaption id=\"caption-attachment-1921\" class=\"wp-caption-text\">Kilde: Wikipedia<\/figcaption><\/figure>\n<p>Omend jeg ville elske at have et s\u00e5dan apparat i instrumentparken, s\u00e5 er det trods alt begr\u00e6nset hvor ofte jeg har nytte af det, og det er ikke just gratis. Kigger man p\u00e5 ovenst\u00e5ende konceptdiagram s\u00e5 ser det jo ret simpelt ud selv at lave et LISN, men i realiteten er det ikke s\u00e5 simpelt. spolen er ikke bare en tilf\u00e6ldig spole fra skuffen.<\/p>\n<p>Her kan I se indersiden af et kommercielt LISN.<\/p>\n<figure id=\"attachment_1924\" aria-describedby=\"caption-attachment-1924\" style=\"width: 2004px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1f60990e8.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1924 size-full\" src=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1f60990e8.png\" alt=\"\" width=\"2004\" height=\"1148\" srcset=\"https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1f60990e8.png 1885w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1f60990e8-300x172.png 300w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1f60990e8-768x440.png 768w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1f60990e8-1024x587.png 1024w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b2a1f60990e8-1200x687.png 1200w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/a><figcaption id=\"caption-attachment-1924\" class=\"wp-caption-text\">Kilde: EEVBLOG, Dave Jones<\/figcaption><\/figure>\n<p>Jeg v\u00e6lger en mere simpel og ikke mindst mere sikker metode til at m\u00e5le st\u00f8jen p\u00e5 elkabler: En H-probe.<\/p>\n<p>For det f\u00f8rste s\u00e5 betyder det, at der ikke er nogen direkte forbindelse mellem min (dyre og h\u00f8jt elskede) spectrum analyzer og de 230V p\u00e5 elkablerne, og for det andet s\u00e5 er jeg egentlig ligeglad med de absolutte niveauer. Til mit form\u00e5l hvor det mere er sp\u00f8rgsm\u00e5l af typen:<\/p>\n<ul>\n<li>&#8220;er der st\u00f8j og ved hvilke frekvenser?&#8221;<\/li>\n<li>&#8220;larmer dims A mere end dims B?&#8221;<\/li>\n<\/ul>\n<p>vil en H-probe v\u00e6re fuldt ud tilstr\u00e6kkelig og sluttelig er en H-probe s\u00e6rdeles let og ikke mindst billig at lave.<\/p>\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<!-- wp-inpost-add -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-7793103161450012\"\r\n     data-ad-slot=\"1741650889\"\r\n     data-ad-format=\"auto\"><\/ins>\r\n<script>\r\n(adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<h4>F\u00f8rst lidt teori!<\/h4>\n<p>Betragter vi et kabel hvor igennem der flyder en str\u00f8m, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-eb4466aee3d5530fffdcec6d5efbf12c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#73;&#95;&#115;&#40;&#116;&#41;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"34\" style=\"vertical-align: -4px;\"\/>, kan man i tidsdom\u00e6net udtrykke sp\u00e6ndingen over et segment af kablet, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-7bf3d3525183759b9eba08ed0ff8d170_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#85;&#95;&#123;&#115;&#101;&#103;&#109;&#101;&#110;&#116;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"62\" style=\"vertical-align: -6px;\"\/> som en funktion af kablets induktans per l\u00e6ngdeenhed <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-e4a6851d6d325778e745b6fe4de78e89_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#85;&#95;&#123;&#115;&#101;&#103;&#109;&#101;&#110;&#116;&#125;&#32;&#61;&#32;&#76;&#32;&#92;&#99;&#100;&#111;&#116;&#32;&#92;&#102;&#114;&#97;&#99;&#123;&#100;&#95;&#105;&#125;&#123;&#100;&#95;&#116;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"127\" style=\"vertical-align: -8px;\"\/>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-2674062201d8959a0000631b453f271c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#92;&#102;&#114;&#97;&#99;&#123;&#100;&#95;&#105;&#125;&#123;&#100;&#95;&#116;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"13\" style=\"vertical-align: -8px;\"\/> er et matematisk udtryk for &#8220;<em>str\u00f8mmens \u00e6ndring over tid<\/em>&#8220;.<\/p>\n<p><a href=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/drawing.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1913 size-full\" src=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/drawing.png\" alt=\"\" width=\"491\" height=\"415\" srcset=\"https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/drawing.png 491w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/drawing-300x254.png 300w\" sizes=\"auto, (max-width: 491px) 85vw, 491px\" \/><br \/>\n<\/a>Hvis vi laver et firkantet loop og holder den ene side t\u00e6t op ad og parallelt med kablet vil en sp\u00e6nding <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-6ea158b6122f6202dc53465d151a1122_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#85;&#95;&#112;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"18\" style=\"vertical-align: -6px;\"\/>\u00a0 blive induceret i loopet, som afh\u00e6nger af den induktive kobling, <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-316287c6f5fadf7cd4af9475c28d18d1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#77;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"19\" style=\"vertical-align: 0px;\"\/> mellem kablet og vores primitive probe. Denne sp\u00e6nding kan udtrykkes som <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-cb5ad3e13dd421449c20f8ee1c0fc069_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#85;&#95;&#112;&#32;&#61;&#32;&#77;&#32;&#92;&#99;&#100;&#111;&#116;&#32;&#92;&#102;&#114;&#97;&#99;&#123;&#100;&#95;&#105;&#125;&#123;&#100;&#95;&#116;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"24\" width=\"89\" style=\"vertical-align: -8px;\"\/>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-316287c6f5fadf7cd4af9475c28d18d1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#77;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"19\" style=\"vertical-align: 0px;\"\/> er per definition altid mindre end <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-649dd83fe5ed56224cf7f675eed3a2b9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#76;\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"12\" style=\"vertical-align: 0px;\"\/> og derfor f\u00f8lger det, at <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-6ea158b6122f6202dc53465d151a1122_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#85;&#95;&#112;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"18\" style=\"vertical-align: -6px;\"\/> altid vil have den samme grundl\u00e6ggende signalform som <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/noerdoteket.dk\/wp-content\/ql-cache\/quicklatex.com-7bf3d3525183759b9eba08ed0ff8d170_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"&#85;&#95;&#123;&#115;&#101;&#103;&#109;&#101;&#110;&#116;&#125;\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"62\" style=\"vertical-align: -6px;\"\/>, men amplituden vil v\u00e6re lavere.<\/p>\n<p>Vores primitive probe vil kunne vise en relativ n\u00f8jagtig repr\u00e6sentation af den str\u00f8m der l\u00f8ber gennem kablet ved frekvenser op til omkring 1 GHz. Kr\u00e6ves h\u00f8jere frekvenser skal spolens induktans v\u00e6re lavere, og dermed skal H-probens dimensioner reduceres. Prisen vil v\u00e6re en reduktion i f\u00f8lsomhed ved lavere frekvenser.<\/p>\n<h4>Design og konstruktion<\/h4>\n<p>Nok snak &#8211; lad os bygge dimsen!<\/p>\n<p>I sin helt simple form er der blot tale om et stykke bukket enkeltleder ledning hvor enderne er loddet til henholdsvis centertappen og sk\u00e6rmen p\u00e5 en BNC connektor. Problemet med den l\u00f8sning er, at proben derved vil kunne opsamle RF st\u00f8j, og dermed vil det m\u00e5lte signal afvige fra st\u00f8jsignalet p\u00e5 det kabel man \u00f8nsker at m\u00e5le.<\/p>\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<!-- wp-inpost-add -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-7793103161450012\"\r\n     data-ad-slot=\"1741650889\"\r\n     data-ad-format=\"auto\"><\/ins>\r\n<script>\r\n(adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<p>Vi skal alts\u00e5 bruge sk\u00e6rmet kabel til vores probe, MEN her rammer vi en faldgrube! Magnetfeltet vi \u00f8nsker at m\u00e5le vil koble til sk\u00e6rmen ogs\u00e5 og de resulterende str\u00f8mme i sk\u00e6rmen vil modvirke sp\u00e6ndingen i centerlederen. Derfor skal sk\u00e6rmen i loopet v\u00e6re afbrudt. Bruddet skal placeres pr\u00e6cis i midten af den del som holdes op mod kablet.<\/p>\n<p><a href=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/probe.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1936 size-full\" src=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/probe.png\" alt=\"\" width=\"361\" height=\"365\" srcset=\"https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/probe.png 361w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/probe-297x300.png 297w\" sizes=\"auto, (max-width: 361px) 85vw, 361px\" \/><\/a><\/p>\n<p>Hvilket kabel skal man bruge?<\/p>\n<p>Kablet skal have en karakteristisk impedans som matcher det instrument som det skal tilsluttes. Typisk 50 Ohm.<\/p>\n<p>Det bedste vil v\u00e6re hvis du kan finde stift (rigid) coax kabel. S\u00e5 kan du blot bukke kablet i den \u00f8nskede form, og s\u00e5 sikrer du at inderlederen kan komme t\u00e6ttest muligt p\u00e5 det kabel som du vil m\u00e5le p\u00e5. Signalet falder med kvadratet p\u00e5 afstanden, s\u00e5 hver en millimeter t\u00e6ller!<\/p>\n<p>Derfor er det ogs\u00e5 en fordel at v\u00e6lge tyndt coax kanel, som f.eks. RG316. Jeg valgte dog at f\u00f8lge <a href=\"http:\/\/www.n\u00f8rdoteket.dk\/index.php\/hdehis-princippet\/\" target=\"_blank\" rel=\"noopener\">HDEHIS-princippet<\/a>, og endte derfor med at bruge et RG58 kabel.<\/p>\n<p>Fordelen er at kablet allerede er bestykket med en BNC konnektor som passer p\u00e5 et oscilloscop og med en adaptor ogs\u00e5 p\u00e5 min spectrum analyzer. Der er dog et par ulemper: Mit RG58 kabel er ikke rigidt og dermed kan det ikke af egen kraft fastholde en kvadratisk form. Dern\u00e6st er kablet relativt tykt, og dermed koster det en smule f\u00f8lsomhed i forhold til RG316.<\/p>\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<!-- wp-inpost-add -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-7793103161450012\"\r\n     data-ad-slot=\"1741650889\"\r\n     data-ad-format=\"auto\"><\/ins>\r\n<script>\r\n(adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<p>Jeg har designet og 3d printet en ramme til kablet, som b\u00e5de fastholder kablet i den \u00f8nskede form og laver et h\u00e5ndtag s\u00e5 man kan bruge proben lidt lettere. I kan finde filerne her:\u00a0 https:\/\/www.thingiverse.com\/thing:2971386<\/p>\n<p id=\"qTPBouW\"><a href=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b28b176d8ed0.png\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1275\" class=\"alignnone size-full wp-image-1909 \" src=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b28b176d8ed0.png\" alt=\"\" srcset=\"https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b28b176d8ed0.png 2560w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b28b176d8ed0-300x149.png 300w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b28b176d8ed0-768x383.png 768w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b28b176d8ed0-1024x510.png 1024w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/img_5b28b176d8ed0-1200x598.png 1200w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/a><\/p>\n<p>De to halvdele er samlet med epoxylim og det f\u00e6rdige resultat kan I se her:<a href=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-15.37.56.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-1904 size-large\" src=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-15.37.56-1024x768.jpg\" alt=\"\" width=\"840\" height=\"630\" srcset=\"https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-15.37.56-1024x768.jpg 1024w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-15.37.56-300x225.jpg 300w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-15.37.56-768x576.jpg 768w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-15.37.56-1200x900.jpg 1200w, https:\/\/noerdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-15.37.56.jpg 1440w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Og her et lille eksempel p\u00e5 proben i brug. Spectrum analyzeren viser den st\u00f8j der er p\u00e5 elkablet n\u00e5r et par PLA enheder er forbundet og der flyder trafik.<\/p>\n<div style=\"width: 840px;\" class=\"wp-video\"><!--[if lt IE 9]><script>document.createElement('video');<\/script><![endif]-->\n<video class=\"wp-video-shortcode\" id=\"video-1902-1\" width=\"840\" height=\"473\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-17.48.46.mp4?_=1\" \/><a href=\"http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-17.48.46.mp4\">http:\/\/www.n\u00f8rdoteket.dk\/wp-content\/uploads\/2018\/06\/2018-05-03-17.48.46.mp4<\/a><\/video><\/div>\n<p>&nbsp;<\/p>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<!-- wp-ad-rect -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-7793103161450012\"\r\n     data-ad-slot=\"8706514482\"\r\n     data-ad-format=\"auto\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Til mit teknologiske deep-dive om PLC teknologi havde jeg brug for at m\u00e5le p\u00e5 den st\u00f8j som PLC (og elendige LED p\u00e6rer) introducer p\u00e5 elkabler.<\/p>\n","protected":false},"author":1,"featured_media":1909,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[230,45,181,127,171,243,53],"tags":[285,287,286,288,4,289],"class_list":["post-1902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-3d-print","category-diverse","category-elektronik","category-goer-det-selv","category-maaleinstrumenter","category-test","category-tipsticks","tag-h-probe","tag-oscilloscop","tag-probe","tag-spectrum-analyzer","tag-stoej","tag-udstraaling"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - 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