{"id":4047,"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":"2019-04-30T10:41:15","modified_gmt":"2019-04-30T10:41:15","slug":"about-rms","status":"publish","type":"page","link":"https:\/\/limittools.test.consids5.se\/no\/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]Det er temmelig vanskelig a\u030a utf\u00f8re n\u00f8yaktige str\u00f8mma\u030alinger i dagens industri- og kontorlokaler, der personlige datamaskiner, motorstyringer og utstyr som trekker str\u00f8m i korte pulser i stedet for et jevnt sinusformat, er det normale. Denne typen utstyr gj\u00f8r at vanlige instrumenter for likerettet registrering av gjennomsnittsverdier, viser mer eller mindre feil. Na\u030ar du en eller annen gang har lett etter a\u030arsaken til at en sikring ble utl\u00f8st, er kanskje multimeteret a\u030arsaken.[\/vc_column_text][vc_column_text]<strong>LIKERETTET REGISTRERING AV GJENNOMSNITTSVERDIER<\/strong><\/p>\n<p>Na\u030ar man snakker om ma\u030aleverdier for vekselstr\u00f8m, mener man vanligvis effektivverdien, dvs. varmeeffekten, i datablader RMS (Root Mean Square). Denne verdien er lik en likestr\u00f8m som gir samme varmeeffekt i en resistor som den ma\u030alte vekselstr\u00f8mmen. Den vanligste metoden for a\u030a ma\u030ale denne varmeeffekten med et multimeter er a\u030a likerette vekselstr\u00f8mmen, bestemme gjennomsnittsverdien av det likerettede signalet og multiplisere resultatet med faktoren 1.11. Denne faktoren representerer et forhold mellom gjennomsnittsverdien og effektivverdien pa\u030a en perfekt sinuskurve. Hvis kurven ikke er perfekt sinusformet, gjelder imidlertid ikke dette forholdet lenger. Dette er a\u030arsaken til at instrumenter for likerettet registrering av gjennomsnittsverdier som oftest gir feilaktige verdier na\u030ar man ma\u030aler str\u00f8m i dagens elsystemer.[\/vc_column_text][\/vc_column][vc_column width=&#8221;1\/2&#8243;][vc_column_text]<\/p>\n<h4>LINE\u00e6RE OG IKKE-LINE\u00e6RE LASTER<\/h4>\n<p>Line\u00e6re laster besta\u030ar i hovedsak av resistorer, spoler og kondensatorer, som alltid trekker str\u00f8mmen sinusformet. Derfor er det ingen problemer med slike laster (se figur 1). Ikke-line\u00e6re laster, som f.eks. frekvensomformere og de svitsjede str\u00f8maggregatene i kontorelektronikken, trekker str\u00f8mmen forvrengt (se figur 2). Ma\u030aling av effektivverdien med instrumenter for likerettet registrering av gjennomsnittsverdier kan gi opp til 50 % for lav ma\u030aleverdi. Det kan resultere i at du sta\u030ar og lurer pa\u030a hvorfor en 14 A sikring utl\u00f8ses hele tiden, til tross for at multimeteret viser 10 A.[\/vc_column_text][vc_column_text]<\/p>\n<h4>SANN EFFEKTVVERDI<\/h4>\n<p>For a\u030a ma\u030ale pa\u030a slike forvrengte kurveformer kan du f\u00f8rst kontrollere kurveformen med et grafisk instrument og bare bruke et instrument for likerettet registrering av gjennomsnittsverdier hvis kurven er perfekt sinusformet. Hvis du ikke vil ta noen sjanser, skal du alltid bruke et instrument som ma\u030aler sann effektivverdi direkte. <strong>Et moderne multimeter for ma\u030aling av sann effektivverdi benytter en elektronisk ma\u030aleteknikk for alltid a\u030a vise riktig effektivverdi for en vekselstr\u00f8m, uavhengig av om kurveformen er sinusformet eller om den er forvrengt.<\/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]Det er temmelig vanskelig a\u030a utf\u00f8re n\u00f8yaktige str\u00f8mma\u030alinger i dagens industri- og kontorlokaler, der personlige datamaskiner, motorstyringer og utstyr [&hellip;]","protected":false},"author":2,"featured_media":1691,"parent":4026,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-4047","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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