{"id":16179,"date":"2019-09-13T14:02:50","date_gmt":"2019-09-13T12:02:50","guid":{"rendered":"https:\/\/gemac-fieldbus.com\/?p=16179"},"modified":"2025-10-27T13:00:27","modified_gmt":"2025-10-27T12:00:27","slug":"cantouch-measurement-level-ratio","status":"publish","type":"post","link":"https:\/\/alt.gemac-fieldbus.com\/en\/cantouch-measurement-level-ratio\/","title":{"rendered":"CANtouch &#8211; new measurement Level Ratio"},"content":{"rendered":"<div id='av_section_1'  class='avia-section av-33k83wd-8b30db614f4de5820ed35d07bfc48a31 main_color avia-section-default avia-no-shadow  avia-builder-el-0  avia-builder-el-no-sibling  avia-bg-style-scroll container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><main  role=\"main\" itemprop=\"mainContentOfPage\"  class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-16179'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-2qk0trx-c00e667c5d74003a0b8a5d681cf70d5f\">\n.flex_column.av-2qk0trx-c00e667c5d74003a0b8a5d681cf70d5f{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-2qk0trx-c00e667c5d74003a0b8a5d681cf70d5f av_three_fourth  avia-builder-el-1  el_before_av_one_fourth  avia-builder-el-first  first flex_column_div av-zero-column-padding  '     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_heading-a90594276a6e2e076a1e177f7e195e91\">\n#top .av-special-heading.av-av_heading-a90594276a6e2e076a1e177f7e195e91{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-av_heading-a90594276a6e2e076a1e177f7e195e91 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-av_heading-a90594276a6e2e076a1e177f7e195e91 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-av_heading-a90594276a6e2e076a1e177f7e195e91 av-special-heading-h1 blockquote modern-quote  avia-builder-el-2  el_before_av_hr  avia-builder-el-first  av-linked-heading'><h1 class='av-special-heading-tag '  itemprop=\"headline\"  >Software version 2.36 for CANtouch<br \/>\nNew measurement of Level Ratio<\/h1><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<div  class='hr av-qzlmkd-d9da2740bc29eed78bdfd13355f112cf hr-default  avia-builder-el-3  el_after_av_heading  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-jv27ddyt-512248bb46fe25dcfbab5a0c3edab07f '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><h2><strong><img decoding=\"async\" class=\"alignleft wp-image-1998 lazyload\" data-src=\"https:\/\/static.gemac-fieldbus.com\/2016\/06\/Logo-CANtouch-Schein.png\" alt=\"Logo CANtouch Schein\" width=\"139\" height=\"50\" data-srcset=\"https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2016\/06\/Logo-CANtouch-Schein.png 500w, https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2016\/06\/Logo-CANtouch-Schein-300x108.png 300w, https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2016\/06\/Logo-CANtouch-Schein-495x180.png 495w, https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2016\/06\/Logo-CANtouch-Schein-450x162.png 450w\" data-sizes=\"auto\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 139px; --smush-placeholder-aspect-ratio: 139\/50;\" data-original-sizes=\"(max-width: 139px) 100vw, 139px\" \/><\/strong><\/h2>\n<p><img decoding=\"async\" class=\"alignright size-full wp-image-16159 lazyload\" data-src=\"https:\/\/static.gemac-fieldbus.com\/2019\/04\/AppCANLevelsabs.png\" alt=\"\" width=\"57\" height=\"57\" data-srcset=\"https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2019\/04\/AppCANLevelsabs.png 57w, https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2019\/04\/AppCANLevelsabs-36x36.png 36w, https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2019\/04\/AppCANLevelsabs-45x45.png 45w\" data-sizes=\"auto\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 57px; --smush-placeholder-aspect-ratio: 57\/57;\" data-original-sizes=\"(max-width: 57px) 100vw, 57px\" \/>The new software version from September 2019 comes with a new measured value for the CAN bus, the level ratio. This new measured value facilitates the detection of short circuits and transition resistances in a wire or between wires as well as of electronic faults in CAN nodes. The difficulty in detecting problems with certain absolute voltage levels is that similar constellations can also arise due to Common Mode. It was, therefore, necessary to find a way of reliably distinguishing permissible common-mode shifts from cases of a short circuit or contact resistance.<\/p>\n<p>Until now, specific errors could only be detected indirectly, for example, the short-circuit from CAN_L to ground. The problem was only visible in the physical oscilloscope image. The Automatic Quick Test was able to evaluate the bus completely thoroughly, even though a line was faulty. Due to the additional measured value level ratio, the CANtouch now reliably detects such errors.<\/p>\n<p><a href=\"https:\/\/static.gemac-fieldbus.com\/2019\/04\/CANtouch_Levelratio_EN_news.png\"><img decoding=\"async\" class=\"alignright wp-image-16181 size-medium lazyload\" title=\"CAN Bus Level Ratio CAN_H\/CAN_L\" data-src=\"https:\/\/static.gemac-fieldbus.com\/2019\/04\/CANtouch_Levelratio_EN_news-300x161.png\" alt=\"CAN Bus Level Ratio CAN_H\/CAN_L\" width=\"300\" height=\"161\" data-srcset=\"https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2019\/04\/CANtouch_Levelratio_EN_news-300x161.png 300w, https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2019\/04\/CANtouch_Levelratio_EN_news-768x411.png 768w, https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2019\/04\/CANtouch_Levelratio_EN_news-705x378.png 705w, https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2019\/04\/CANtouch_Levelratio_EN_news-450x241.png 450w, https:\/\/alt.gemac-fieldbus.com\/wp-content\/uploads\/2019\/04\/CANtouch_Levelratio_EN_news.png 943w\" data-sizes=\"auto\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 300px; --smush-placeholder-aspect-ratio: 300\/161;\" data-original-sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>The level ratio describes the percentage shares of CAN_H and CAN_L in the difference signal for the dominant bus state. 100% are distributed over the two lines CAN_L and CAN_H, whereby a distribution of 50% to 50% is optimal. Deviations from the ideal occur, for example, when transition resistances or short circuits arise from a line to the supply voltage or ground. The transceivers with 3.3V power supply installed in some nodes have a negative influence on the level ratio, whereby the preset evaluation thresholds selected in such a way that this slight shift of roundabout 5% does not signal an error.<\/p>\n<p>As is usual with the CANtouch, the evaluation limits in the cantouch.property.rating.xml file can also be set project-related for this measurement. The default setting causes\u00a0the output of a warning if the share of one of the lines falls below 30%. A value below 20% is considered an error.<\/p>\n<\/div><\/section><\/p><\/div>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-28hmwjh-eb2e7d3adcc2c271402b4f3478fb51ce\">\n.flex_column.av-28hmwjh-eb2e7d3adcc2c271402b4f3478fb51ce{\nborder-radius:0px 0px 0px 0px;\npadding:0px 0px 0px 0px;\n}\n<\/style>\n<div  class='flex_column av-28hmwjh-eb2e7d3adcc2c271402b4f3478fb51ce av_one_fourth  avia-builder-el-5  el_after_av_three_fourth  avia-builder-el-last  flex_column_div av-zero-column-padding  '     ><section  class='av_textblock_section av-jv27dlok-3287ae8d8b2f80e7fc9e2ecf2824a050 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p style=\"text-align: center;\">September 2019<\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" 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