{"id":1283,"date":"2019-01-02T13:18:22","date_gmt":"2019-01-02T13:18:22","guid":{"rendered":"http:\/\/limit-tools.local\/tips-and-tricks\/about-rms\/"},"modified":"2019-04-29T08:35:35","modified_gmt":"2019-04-29T08:35:35","slug":"about-rms","status":"publish","type":"page","link":"https:\/\/limittools.test.consids5.se\/sv\/tips-and-tricks\/about-rms\/","title":{"rendered":"OM RMS"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]Noggranna stro\u0308mma\u0308tningar a\u0308r ganska sva\u030ara att utfo\u0308ra i dagens industri- och kontorsfastigheter, da\u0308r persondatorer, motorstyrningar och utrustningar som drar stro\u0308m i korta pulser i sta\u0308llet fo\u0308r ja\u0308mnt sinusformat a\u0308r det normala. denna typ av utrustning go\u0308r att vanliga likriktat medelva\u0308rdeska\u0308nnande instrument visar mer eller mindre fel. da\u0308r du na\u030agon ga\u030ang har letat efter orsaken till en utlo\u0308st sa\u0308kring, utan att finna den, kanske din multimeter a\u0308r orsaken.[\/vc_column_text][vc_column_text]<\/p>\n<h4>Likriktat medelva\u0308rdeska\u0308nnande<\/h4>\n<p>Na\u0308r man pratar om ma\u0308tva\u0308rden fo\u0308r va\u0308xelstro\u0308m, menar man vanligtvis effektivva\u0308rdet, dvs. va\u0308rme- effekten, i databladen rMs (root Mean square). detta va\u0308rde a\u0308r lika med en likstro\u0308m som ger samma va\u0308rmeeffekt i en resistor som den upp- ma\u0308tta va\u0308xelstro\u0308mmen. den vanligaste metoden att ma\u0308ta denna va\u0308rmeeffekt med en multimeter a\u0308r att likrikta va\u0308xelstro\u0308mmen, ta reda pa\u030a medelva\u0308rdet av den likriktade signalen och multiplicera resultatet med faktorn 1,11. denna faktor representerar ett fo\u0308rha\u030allande mellan medelva\u0308rdet och effektiv- va\u0308rdet pa\u030a en perfekt sinuskurva. A\u0308r kurvan inte perfekt sinusformad ga\u0308ller dock ej la\u0308ngre detta fo\u0308rha\u030allande. detta a\u0308r orsaken till att likriktat medelva\u0308rdeska\u0308nnade instrument fo\u0308r det mesta ger felaktiga va\u0308rden da\u030a man ma\u0308ter stro\u0308m i dagens elsystem.[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<h4>Linja\u0308ra och ickelinja\u0308ra laster<\/h4>\n<p>Linja\u0308ra laster besta\u030ar huvudsakligen av resistorer, spolar och kondensatorer, som alltid drar stro\u0308m- men sinusformad. da\u0308rfo\u0308r finns ej na\u030agra problem med dessa laster (se figur 1). Ickelinja\u0308ra laster, som t.ex. frekvensomriktare och de switchade kraftag- gregaten i kontorselektroniken, drar stro\u0308mmen fo\u0308rvra\u0308ngd (se figur 2). Ma\u0308tning av effektivva\u0308rdet med likriktat medelva\u0308rdeska\u0308nnande instrument kan ge upp till 50 % fo\u0308r la\u030agt ma\u0308tva\u0308rde. det kan resultera i att du sta\u030ar och undrar varfo\u0308r en 14A sa\u0308kring kontinuerligt lo\u0308ser ut, trots att din multimeter visar 10A.[\/vc_column_text][vc_column_text]<\/p>\n<h4>Sant effektivva\u0308rde<\/h4>\n<p>Fo\u0308r att ma\u0308ta pa\u030a sa\u030adana fo\u0308rvra\u0308ngda kurvformer kan du fo\u0308rst med ett grafiskt instrument kontrollera kurvformen och endast anva\u0308nda likriktat medel- va\u0308rdeska\u0308nnande instrument om kurvan a\u0308r perfekt sinusformad. Om du inte vill chansa ska du alltid anva\u0308nda ett instrument som direkt ma\u0308ter det sanna effektivva\u0308rdet. <strong>En modern sant effektivva\u0308rdesma\u0308- tande multimeter anva\u0308nder en elektronisk ma\u0308t- teknik fo\u0308r att alltid visa det riktiga effektivva\u0308rdet pa\u030a en va\u0308xelstro\u0308m, oberoende av om kurvformen a\u0308r sinusformad eller om den a\u0308r fo\u0308rvra\u0308ngd.<\/strong>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"[vc_row][vc_column width=&#8221;1\/2&#8243;][vc_column_text]Noggranna stro\u0308mma\u0308tningar a\u0308r ganska sva\u030ara att utfo\u0308ra i dagens industri- och kontorsfastigheter, da\u0308r persondatorer, motorstyrningar och utrustningar som drar [&hellip;]","protected":false},"author":2,"featured_media":1279,"parent":1268,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-1283","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.2 - 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