{"id":4397,"date":"2026-10-20T17:42:49","date_gmt":"2026-10-20T09:42:49","guid":{"rendered":"https:\/\/www.carbon-fiber-corp.com\/measurement-uncertainty-carbon-fiber-tolerance\/"},"modified":"2026-10-20T17:42:49","modified_gmt":"2026-10-20T09:42:49","slug":"measurement-uncertainty-carbon-fiber-tolerance","status":"publish","type":"post","link":"https:\/\/www.carbon-fiber-corp.com\/zh\/measurement-uncertainty-carbon-fiber-tolerance\/","title":{"rendered":"Measurement Uncertainty and Drawing Tolerance Have Different Jobs"},"content":{"rendered":"<style>.ly-note{max-width:880px;margin:0 auto;color:#26333c;line-height:1.85;font-size:17px}.ly-note h2{font-size:1.5rem;line-height:1.35;margin:1.8em 0 .6em}.ly-note p{margin:0 0 1.2em}.ly-note .intro{font-size:1.08em}.ly-note figure{margin:2em 0}.ly-note figure img{display:block;width:100%;height:auto}.ly-note figcaption{font-size:.88rem;color:#60727d;line-height:1.55;margin-top:10px}.ly-note ul{padding-left:1.4em}.ly-note li{margin:.45em 0}.ly-note a{color:#8e1e34;text-decoration:underline;text-underline-offset:3px}.ly-note .notes{padding:20px 28px;background:#f0f4f5;border-left:3px solid #296c85;margin:2em 0}.ly-note .notes h2{font-size:1.1rem;margin:0 0 .8em}.ly-note .reading{border-top:1px solid #d9e1e5;margin-top:2em;padding-top:1.1em}.single-post .entry-title{font-size:clamp(1.8rem,3.8vw,2.6rem);line-height:1.25}.single-post .post-thumb-img-content img{width:100%;height:auto;max-height:360px;object-fit:contain;background:#fbfcfc}@media(max-width:600px){.ly-note{font-size:16px}.ly-note h2{font-size:1.3rem}.ly-note .notes{padding:17px}}<\/style><div class=\"ly-note\"><p class=\"intro\">A drawing tolerance defines an allowed requirement. Measurement uncertainty describes the dispersion associated with values attributed to the measured quantity. They should not be merged into one unlabeled \u201caccuracy\u201d figure when comparing a carbon fiber inspection result with its requirement.<\/p><p>NIST\u2019s uncertainty resources distinguish the reported measurement result from its uncertainty information. For component records, keep the method, measured feature and relevant conditions identifiable. More displayed decimal places do not by themselves establish a smaller uncertainty.<\/p><h2>Agree how conformity will be assessed<\/h2><p>If a result is close to a requirement boundary, the agreed decision process matters. Resolve the applicable inspection and acceptance convention with the responsible technical parties before release. This article does not supply a universal acceptance rule or an assumed ratio between instrument capability and part tolerance.<\/p><h2>Compare compatible reports<\/h2><p>Use the same feature definition, reference condition and units. If two measurements disagree, retain their methods and uncertainty information rather than immediately deciding that one part or instrument is wrong. A drawing requirement, instrument specification and finished measurement report are related documents, but each answers a different question.<\/p><figure><a href=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261020-15-uncertainty-2.webp\" aria-label=\"Open the full-size diagram\"><img src=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261020-15-uncertainty-2.webp\" alt=\"Retain the requirement, method and agreed conformity decision process.\" width=\"1600\" height=\"1000\" loading=\"lazy\" decoding=\"async\"><\/a><figcaption>Retain the requirement, method and agreed conformity decision process. <a href=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261020-15-uncertainty-2.webp\">View full size<\/a>.<\/figcaption><\/figure><aside class=\"notes\"><h2>Keep these details together<\/h2><ul><li>Drawing requirement and measured feature<\/li><li>Measurement method and conditions<\/li><li>Uncertainty information where applicable<\/li><li>Agreed conformity decision process<\/li><\/ul><\/aside><p>Further reading: <a href=\"https:\/\/www.nist.gov\/itl\/sed\/topic-areas\/measurement-uncertainty\">NIST: measurement uncertainty<\/a>.<\/p><div class=\"reading\"><p>Related: <a href=\"https:\/\/www.carbon-fiber-corp.com\/carbon-fiber-inspection-coordinates-agree-units-axes-and-file-format\/\">Carbon Fiber Inspection Coordinates: Agree Units, Axes and File Format<\/a> \u00b7 <a href=\"https:\/\/www.carbon-fiber-corp.com\/thin-wall-carbon-fiber-tube-measurement-contact\/\">Measuring Thin-Wall Carbon Fiber Tubes: Define the Contact Condition<\/a>.<\/p><p><a href=\"https:\/\/www.carbon-fiber-corp.com\/contact\/\">Discuss your component with Litian Yunde<\/a> \u00b7 <a href=\"https:\/\/www.carbon-fiber-corp.com\/carbon-fiber-guides\/\">Browse the component guides<\/a><\/p><\/div><\/div><script type=\"application\/ld+json\" class=\"ly-article-schema\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BlogPosting\", \"@id\": \"https:\/\/www.carbon-fiber-corp.com\/measurement-uncertainty-carbon-fiber-tolerance\/#article\", \"headline\": \"Measurement Uncertainty and Drawing Tolerance Have Different Jobs\", \"description\": \"Separate measurement uncertainty from drawing tolerance in composite inspection. Retain the method, conditions and agreed conformity decision process.\", \"image\": [\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261020-15-uncertainty-1.webp\", \"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261020-15-uncertainty-2.webp\"], \"datePublished\": \"2026-10-20T09:42:49Z\", \"mainEntityOfPage\": {\"@type\": \"WebPage\", \"@id\": \"https:\/\/www.carbon-fiber-corp.com\/measurement-uncertainty-carbon-fiber-tolerance\/\"}, \"author\": {\"@type\": \"Organization\", \"name\": \"Litian Yunde\", \"url\": \"https:\/\/www.carbon-fiber-corp.com\/about\/\"}, \"publisher\": {\"@type\": \"Organization\", \"name\": \"Dongguan Litian Yunde New Materials Technology Co., Ltd.\", \"url\": \"https:\/\/www.carbon-fiber-corp.com\/\"}, \"inLanguage\": \"en\", \"articleSection\": \"Inspection & Testing\"}<\/script>","protected":false},"excerpt":{"rendered":"<p>A drawing tolerance defines an allowed requirement. Measurement uncertainty describes the dispersion associated with values attributed to the measured quantity. They should not be merged into one unlabeled \u201caccuracy\u201d figure when comparing a carbon fiber inspection result with its requirement.<\/p>","protected":false},"author":1,"featured_media":4372,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Measurement Uncertainty and Tolerance | Litian Yunde","_seopress_titles_desc":"Separate measurement uncertainty from drawing tolerance in composite inspection. 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Measurement uncertainty describes the dispersion associated with values attributed to the measured quantity. They should not be merged into one unlabeled \u201caccuracy\u201d figure when comparing a carbon fiber inspection result with its requirement.","_links":{"self":[{"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/posts\/4397","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/comments?post=4397"}],"version-history":[{"count":0,"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/posts\/4397\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/media\/4372"}],"wp:attachment":[{"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/media?parent=4397"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/categories?post=4397"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.carbon-fiber-corp.com\/zh\/wp-json\/wp\/v2\/tags?post=4397"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}