{"id":7309,"date":"2021-05-03T10:43:42","date_gmt":"2021-05-03T08:43:42","guid":{"rendered":"https:\/\/www.neo-messtechnik.com\/?p=7309"},"modified":"2025-10-07T10:39:17","modified_gmt":"2025-10-07T08:39:17","slug":"iec-61400-4-30-class-a","status":"publish","type":"post","link":"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a","title":{"rendered":"Understanding IEC 61000-4-30 Class A Power Quality Analyzer"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>The IEC 61000-4-30 Class A Ed. 3 defines the methods for measurement and interpretation of results for power quality parameters in AC power supply systems with a declared fundamental frequency of 50 Hz or 60 Hz. What does that mean? Let&#8217;s take a closer look on the Class A classification and how it impacts your decision for a power quality analyzer.<\/strong><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a7835488438a\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #000000;color:#000000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #000000;color:#000000\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a7835488438a\" checked aria-label=\"Toggle\" \/><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.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#Introduction\" >Introduction<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#No_standards_no_problems\" >No standards, no problems?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#What_is_the_IEC_61000-4-30_Ed_3_standard\" >What is the IEC 61000-4-30 Ed. 3 standard?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#IEC_61000-4-30_Measurement_Classes\" >IEC 61000-4-30 Measurement Classes<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#What_does_Class_A_mean_according_to_the_IEC_61000-4-30\" >What does Class A mean according to the IEC 61000-4-30?<\/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.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#Measurement_uncertainty\" >Measurement uncertainty<\/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.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#Voltage_flagging\" >Voltage flagging<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#Time_aggregation_of_PQ_data_Frequency_determination\" >Time aggregation of PQ data &amp; Frequency determination<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#Requirements_of_4_differential_voltage_and_4_differential_current_channels\" >Requirements of 4 differential voltage and 4 differential current channels<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#Class_A_Power_Quality_Analyser\" >Class A ++ Power Quality Analyser<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#Further_Reading\" >Further Reading<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.neo-messtechnik.com\/en\/iec-61400-4-30-class-a\/#The_Ultimate_Guide_to_Power_Quality\" >The Ultimate Guide to Power Quality<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Introduction\"><\/span>Introduction<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Whether it is for your own interest, regulatory reasons or customer complaints &#8211; our main goal is to gain knowledge on how to detect Power Quality issues. Furthermore, which PQ Monitoring systems fit these needs and regulatory requirements. Serving as first step we will talk about the standard that defines how to correctly measure PQ parameters. First introduced in 2003, it&#8217;s latest version published in 2015 &#8211; you may already nod your head &#8211; we are certainly talking about the <strong><em>IEC 61000-4-30: Ed. 3 Testing and measurement techniques &#8211; Power quality measurement methods<\/em><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"No_standards_no_problems\"><\/span>No standards, no problems?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Although it seems like a long time ago, Power Quality Assessments lacked standards and comparable limits. Reports and hence Power Quality level depended on your PQ instrument, which wasn&#8217;t a satisfying situation for engineers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"ClassA\"><span class=\"ez-toc-section\" id=\"What_is_the_IEC_61000-4-30_Ed_3_standard\"><\/span>What is the IEC 61000-4-30 Ed. 3 standard?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>It defines the methods for measurement and interpretation of results for power quality parameters in a.c. power supply systems with a declared fundamental frequency of 50 Hz or 60 Hz.<\/p><cite><a rel=\"noreferrer noopener\" href=\"https:\/\/webstore.iec.ch\/publication\/21844\" target=\"_blank\">International Electrotechnical Commission<\/a><\/cite><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">In short, independently of the PQ instrument of your choice, the IEC 61000-4-30 established a common framework for PQ Monitoring systems to obtain reliable and comparable results.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"IEC_61000-4-30_Measurement_Classes\"><\/span>IEC 61000-4-30 Measurement Classes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items_eb9058-dd kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-0\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Class B     &#8211; actually not mentioned in the 3rd edition any longer. Stated here for the sake of completing the picture.<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-1\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Class S     &#8211; lower accuracy requirements and limited PQ parameters taken into account.<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Class A     &#8211; the main topic of this article.<\/span><\/li><\/ul><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items_062c57-85 kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-0\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\"><mark class=\"kt-highlight\">Class A ++ &#8211; classification NEO Messtechnik introduced with the PQ 8000H<\/mark> that goes well beyond the standard Class A requirements. Unmatched and and at the top of the market, because we know from our customers and experience that you won&#8217;t be happy with standard (Class A) solutions only. Especially when you can have PQ Analysers and Monitors that <a rel=\"noreferrer noopener\" href=\"https:\/\/www.neo-messtechnik.com\/en\/pqa8000\" target=\"_blank\">not only exceed standards<\/a>, but your expectations.<\/span><\/li><\/ul><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_does_Class_A_mean_according_to_the_IEC_61000-4-30\"><\/span>What does Class A mean according to the IEC 61000-4-30?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The IEC 61000-4-30 Class A defines measurement methods, time aggregation and specifics about accuracy, bandwidth, limits and evaluation of various PQ parameters. By choosing a <strong><em>Class A complying<\/em><\/strong> instrument, you make the first important step for getting reliable results according to the IEC 61000-4-30. It standardizes measurements of the following parameters<\/p>\n\n\n\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items_b0b641-fb kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-0\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Power frequency<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-1\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Magnitude of supply voltage<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Flicker <strong>(IEC 61000-4-15)<\/strong><\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Supply dips\/swells<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-4\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Voltage Interruptions<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-5\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Voltage unbalance<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-6\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Voltage harmonics and inter-harmonics <strong>(IEC 61000-4-7)<\/strong><\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-7\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Mains signaling<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-8\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Under- and over-deviation<\/span><\/li><\/ul><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">With the third edition the standard was extended by<\/p>\n\n\n\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items_fcc8f6-5f kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-0\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Flicker Class F1<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-1\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Rapid voltage changes<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Current magnitude<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Current harmonics and inter-harmonics <strong>(IEC 61000-4-7)<\/strong><\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-4\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">Current unbalance<\/span><\/li><\/ul><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Measurement_uncertainty\"><\/span>Measurement uncertainty<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Measurement engineers rely on the equipment they are using, and the accuracy it offers. The measurement uncertainty for Class A certified devices is defined at 0.1% of the input voltage. This sets a common level allowing users to get compliant measurement results and compare those of instruments from different companies.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"block-95013342-5b89-4f67-88df-e73a20ec9886\"><span class=\"ez-toc-section\" id=\"Voltage_flagging\"><\/span>Voltage flagging<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Getting reliable results from your power quality measurement and analysis setup is central even throughout voltage dips, swells or interruptions. With the help of the flagging concept single events do not count for multiple occurrences. For example, a single dip doesn&#8217;t count as both frequency variation and voltage dip. What the flag actually indicates is the possibility of unreliability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"block-49d79d2a-2a06-431a-bf18-d78e701dd4a4\">For voltage dips, swells and interruptions, the RMS voltage must be evaluated over 1 cycle (on base of sliding \u00bd period values estimation), commencing at a fundamental zero crossing, and refreshed every half-cycle. Events are detected if the voltage leaves the pre-defined range (usually \u00b110% of Un). By following IEC61000-4-30 according to the illustration, single phase or three-phase events are evaluated in a different way.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"604\" height=\"262\" src=\"https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/image.png\" alt=\"Voltage Flaggin\" class=\"wp-image-6801\" srcset=\"https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/image.png 604w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/image-300x130.png 300w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/image-16x7.png 16w\" sizes=\"auto, (max-width: 604px) 100vw, 604px\" \/><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Time_aggregation_of_PQ_data_Frequency_determination\"><\/span>Time aggregation of PQ data &amp; Frequency determination<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The IEC 61000-4-30 defines the time windows for parameter magnitudes (supply voltage, harmonics, inter-harmonics and unbalance). It is a 10 cycle time interval for a 50 Hz power system or 12-cycle time interval for a 60 Hz power system. Furthermore, aggregations of the measured time intervals takes place over three different time intervals:<\/p>\n\n\n\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items_bcb973-ae kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-0\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">150\/180 cycle interval (150 cycles for 50 Hz nominal or 180 cycles for 60 Hz nominal)<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-1\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">10-min interval<\/span><\/li><li class=\"kt-svg-icon-list-style-default kt-svg-icon-list-item-wrap kt-svg-icon-list-item-2\"><div style=\"display:inline-flex;justify-content:center;align-items:center\" class=\"kt-svg-icon-list-single kt-svg-icon-list-single-fe_checkCircle\"><svg style=\"display:inline-block;vertical-align:middle\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\" fill=\"none\" stroke=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"><path d=\"M22 11.08V12a10 10 0 1 1-5.93-9.14\"><\/path><polyline points=\"22 4 12 14.01 9 11.01\"><\/polyline><\/svg><\/div><span class=\"kt-svg-icon-list-text\">2-h interval<\/span><\/li><\/ul><\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>By the emphasis on the <strong>ongoing <\/strong>monitoring process, questions about data storing and data handling automatically emerge and challenge monitoring systems to varying degrees.<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Requirements_of_4_differential_voltage_and_4_differential_current_channels\"><\/span>Requirements of 4 differential voltage and 4 differential current channels<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">While single-ended amplifiers are easy to use due as their second pin is connected to ground, they are only suitable for measuring floating voltage sources and thereby have two disadvantages \u2013 the influence of ground loops and the missing isolation. Unfortunately some PQ instruments only have single-ended amplifiers only. In contrast to them, differential amplifiers using inputs separated from ground avoid the aforementioned ground loops, although deal with the problem of common mode voltage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Isolated amplifiers eliminate all these disadvantages like ground loops, common mode voltage as they are isolated from the housing and the main board of the measuring device and are therefore a safe and reliable solution handling voltage peaks, faults and other disturbances. All High-Voltage inputs of the NEO Instruments are isolated. Current Inputs (via Low-Voltage inputs) are usually non-isolated, as isolation is provided by the used current sensors.<\/p>\n\n\n\n<hr class=\"wp-block-separator is-style-wide\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Class_A_Power_Quality_Analyser\"><\/span>Class A ++ Power Quality Analyser<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">We cannot end this article about the IEC 61000-4-30 Ed. A Class A without showing you what a Power Quality Analyser can look like <strong>that goes well beyond the norm &#8211; Class A ++<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"450\" height=\"525\" src=\"https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2020\/04\/pqa_side3.png\" alt=\"\" class=\"wp-image-5710\" srcset=\"https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2020\/04\/pqa_side3.png 450w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2020\/04\/pqa_side3-257x300.png 257w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"has-text-align-center has-large-font-size wp-block-paragraph\">PQA 8000H<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">All-In-One. 1MS\/s. Multi-Touch. 4h mobile operation. The reference instrument on the market.<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><a href=\"https:\/\/www.neo-messtechnik.com\/de\/pqa8000\/\">Product Page<\/a><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><a href=\"https:\/\/www.neo-messtechnik.com\/new_addition_pqa_8000h\">How To Spot a Highly Evolved PQ Analyzer<\/a><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><a href=\"https:\/\/www.neo-messtechnik.com\/pqa-8000h-the-columbo-among-power-quality\">PQA 8000H \u2013 The Columbo among Power Quality Analyzer<\/a><\/p>\n<\/div><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Further_Reading\"><\/span>Further Reading<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div id=\"kt-info-box_9e6fe2-9b\" class=\"wp-block-kadence-infobox\"><a class=\"kt-blocks-info-box-link-wrap info-box-link kt-blocks-info-box-media-align-top kt-info-halign-center\" target=\"_blank\" rel=\"noopener noreferrer\" href=\"https:\/\/www.neo-messtechnik.com\/new_addition_pqa_8000h\"><div class=\"kt-blocks-info-box-media-container\"><div class=\"kt-blocks-info-box-media kt-info-media-animate-none\"><div class=\"kadence-info-box-image-inner-intrisic-container\" style=\"max-width:648px\"><div class=\"kadence-info-box-image-intrisic kt-info-animate-none\" style=\"padding-bottom:41.33370074400661%;height:0;width:7258px;max-width:100%\"><div class=\"kadence-info-box-image-inner-intrisic\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/The-Ultimate-Guide-To-Power-Quality_new.png\" alt=\"The Ultimate Guide To Power Quality 2021\" width=\"7258\" height=\"3000\" class=\"kt-info-box-image wp-image-7026 \" srcset=\"https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/The-Ultimate-Guide-To-Power-Quality_new.png 2560w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/The-Ultimate-Guide-To-Power-Quality_new-300x124.png 300w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/The-Ultimate-Guide-To-Power-Quality_new-1024x423.png 1024w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/The-Ultimate-Guide-To-Power-Quality_new-1452x600.png 1452w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/The-Ultimate-Guide-To-Power-Quality_new-1536x635.png 1536w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/The-Ultimate-Guide-To-Power-Quality_new-2048x847.png 2048w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/The-Ultimate-Guide-To-Power-Quality_new-16x7.png 16w, https:\/\/www.neo-messtechnik.com\/wp-content\/uploads\/2021\/03\/The-Ultimate-Guide-To-Power-Quality_new-825x340.png 825w\" sizes=\"auto, (max-width: 7258px) 100vw, 7258px\" \/><\/div><\/div><\/div><\/div><\/div><div class=\"kt-infobox-textcontent\"><h2 class=\"kt-blocks-info-box-title\"><span class=\"ez-toc-section\" id=\"The_Ultimate_Guide_to_Power_Quality\"><\/span>The Ultimate Guide to Power Quality<span class=\"ez-toc-section-end\"><\/span><\/h2><p class=\"kt-blocks-info-box-text\">From &#8220;\u00bd period storing&#8221; to &#8220;Zero sequence&#8221;, here are all the terms, standards and abbreviations you need to understand Power Quality in 2021.<\/p><\/div><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>A closer look on the IEC 61000-4-30 Class A Ed. 3 standard that helps you to choose the right PQ Analyzer that even fulfills NEO&#8217;s Class A++.<\/p>\n","protected":false},"author":1,"featured_media":7314,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[53,1],"tags":[],"class_list":["post-7309","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-power-quality-online-course-2026-pq-explained","category-pq-essentials"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - 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