{"id":4846,"date":"2023-07-01T19:48:49","date_gmt":"2023-07-01T19:48:49","guid":{"rendered":"https:\/\/www.srpcontrol.com\/?p=4846"},"modified":"2023-09-21T19:03:11","modified_gmt":"2023-09-21T19:03:11","slug":"how-to-calibrate-weighing-scale-instruments","status":"publish","type":"post","link":"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/","title":{"rendered":"How to Calibrate Weighing Scale Instruments"},"content":{"rendered":"<p><span data-preserver-spaces=\"true\">Weighing scale instruments are used in a variety of industries for numerous measurements. There are tons of weighing instruments, from small laboratory ones that measure a few grams to industrial weighing\u2014as with any device, weighing instruments need to be calibrated regularly to ensure that they measure correctly and accurately. A proper metrologically traceable calibration is the only way to know how accurately weighing instruments are measuring.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Before Calibration<\/span><\/strong><\/p>\n<p><span data-preserver-spaces=\"true\">Before calibrating a weighing instrument, some considerations need to be considered. You will want to know the technical characteristics of the instrument (max weight, d value), the accuracy requirement (max error allowed and uncertainty), and what to do if the calibration fails (adjustment).<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">When the instrument is being tested on-site, you will need to turn it on before calibration to allow the temperature of the weights to stabilize to the same temperature where the calibration is to be done.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Do a few pretests to ensure that it is usually working. Suppose the weighing instrument fails in calibration and is adjusted. In that case, you should make an \u201cas found\u201d calibration before adjustment and an \u201cas left\u201d calibration after adjustment.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Different Calibration Tests\u00a0<\/span><\/strong><\/p>\n<p><span data-preserver-spaces=\"true\">During calibration several tests should be done during calibrations.<\/span><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">Eccentricity test<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Repeatability test<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Weighing test<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Minimum weight test<\/span><\/li>\n<\/ul>\n<p><strong><span data-preserver-spaces=\"true\">Eccentricity Test\u00a0<\/span><\/strong><\/p>\n<p><span data-preserver-spaces=\"true\">When using a weighing instrument, the load is not always placed perfectly in the center. The results of a weighing instrument can vary slightly depending on if the load is placed in different locations on the receptor. The eccentricity test is performed to test how much effect the site of the load has.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">The test has the reference load placed on the load receptor in a few specified locations. The calibration procedure should establish where to place the load during the test, and calibration results should document the location. The objective of the eccentricity test is to find out the difference caused by the site of the load.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Repeatability Test\u00a0<\/span><\/strong><\/p>\n<p><span data-preserver-spaces=\"true\">All instruments, including weighing, may suffer from repeatability issues. When the same load is measured several times, the result is not always precisely the same. A repeatability test is done to determine the instrument&#8217;s repeatability.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">The repeatability test is performed by replacing the same load on the load receptor multiple times in the same place. The test should be done in identical and constant conditions and with similar handling.\u00a0<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">The load should be close to the maximum load of the instrument and a single load. The repeatability test usually is done by repeating the measurement at least five times in a row. It should be done at least three times for instruments with a high range.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Weighing Test\u00a0<\/span><\/strong><\/p>\n<p><span data-preserver-spaces=\"true\">The weighing test aims to test the accuracy (calibration) of the weighing instrument throughout its whole range in several steps, with increasing and decreasing weight. Start with zeroing the device without any load. Set the limitations of the first test point, wait for stabilization, and record the indication. Continue increasing the loads through all the increasing test points. With multi-range instruments, each range is to be calibrated separately.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Minimum Weight Test\u00a0<\/span><\/strong><\/p>\n<p><span data-preserver-spaces=\"true\">A minimum weight test is a test that is required within some industries, like the pharmaceutical industry. The minimum weight test aims to find the minor load that can be measured while still achieving reliable measurement results and fulfilling the accuracy requirements. When the measured value gets smaller, typically, the relative error of the reading becomes higher. The weighing instrument should not be used to measure any loads more minor than the minimum load.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Other Tests and Calibration<\/span><\/strong><\/p>\n<p><span data-preserver-spaces=\"true\">Some other tests are not done during standard calibration but can be done as a type of approval or initial verification. Some of these tests are a tare test, discrimination test, variation of indication over time, and test of magnetic interaction. If you are still trying to decide what requirements you need for your lab or are overwhelmed with doing it yourself, we can help. SRP control systems can help you care for your equipment as we are an ISO 17025 accredited laboratory that can calibrate your equipment to meet your needs. There will be no surprises, and your instruments and equipment will be accurate and compliant.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"Weighing scale instruments are used in a variety of industries for numerous measurements. There are tons of weighing instruments, from small laboratory ones that measure a few grams to industrial weighing\u2014as with any device, weighing instruments need to be calibrated regularly to ensure that they measure correctly and accurately. A proper metrologically traceable calibration is&#8230;","protected":false},"author":5,"featured_media":5017,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[73],"tags":[],"class_list":["post-4846","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-calibration-guides"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Calibrate Weighing Scale Instruments - SRP control systems ltd<\/title>\n<meta name=\"description\" content=\"During calibration several tests should be done during calibrations. these include: Eccentricity test, Repeatability test, Weighing test, Minimum weight test\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Calibrate Weighing Scale Instruments - SRP control systems ltd\" \/>\n<meta property=\"og:description\" content=\"During calibration several tests should be done during calibrations. these include: Eccentricity test, Repeatability test, Weighing test, Minimum weight test\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/\" \/>\n<meta property=\"og:site_name\" content=\"SRP control systems ltd\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-01T19:48:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-09-21T19:03:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.srpcontrol.com\/wp-content\/uploads\/2023\/07\/IMG_2001-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1920\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"sara\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"sara\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/\",\"url\":\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/\",\"name\":\"How to Calibrate Weighing Scale Instruments - SRP control systems ltd\",\"isPartOf\":{\"@id\":\"https:\/\/www.srpcontrol.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.srpcontrol.com\/wp-content\/uploads\/2023\/07\/IMG_2001-scaled.jpg\",\"datePublished\":\"2023-07-01T19:48:49+00:00\",\"dateModified\":\"2023-09-21T19:03:11+00:00\",\"author\":{\"@id\":\"https:\/\/www.srpcontrol.com\/#\/schema\/person\/7fddec6920195fc39a98aed8805e981c\"},\"description\":\"During calibration several tests should be done during calibrations. these include: Eccentricity test, Repeatability test, Weighing test, Minimum weight test\",\"breadcrumb\":{\"@id\":\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/#primaryimage\",\"url\":\"https:\/\/www.srpcontrol.com\/wp-content\/uploads\/2023\/07\/IMG_2001-scaled.jpg\",\"contentUrl\":\"https:\/\/www.srpcontrol.com\/wp-content\/uploads\/2023\/07\/IMG_2001-scaled.jpg\",\"width\":2560,\"height\":1920},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.srpcontrol.com\/how-to-calibrate-weighing-scale-instruments\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.srpcontrol.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How to Calibrate Weighing Scale Instruments\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.srpcontrol.com\/#website\",\"url\":\"https:\/\/www.srpcontrol.com\/\",\"name\":\"SRP control systems ltd\",\"description\":\"Instrumentation &amp; 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