{"id":1567,"date":"2019-09-04T05:00:15","date_gmt":"2019-09-04T05:00:15","guid":{"rendered":"https:\/\/riedon.com\/blog\/?p=1567"},"modified":"2019-09-06T14:55:07","modified_gmt":"2019-09-06T14:55:07","slug":"tcr-resistors-scale-applications","status":"publish","type":"post","link":"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/","title":{"rendered":"TCR and resistors for scale applications"},"content":{"rendered":"

Minimize temperature coefficient of resistance (TCR)<\/h4>\n

\"\"<\/a>Temperature Coefficient of Resistance, or TCR, refers to how the value of a resistor will vary with changes in temperature.\u00a0 This temperature change can be from changes in the environment around the resistor as well the resistor heating itself as it dissipates power.<\/p>\n

Assuming a perfect tolerance resistor of 100 ohms at 25o<\/sup>C, the table below shows how the actual resistance value will change given different possible TCR choices.<\/p>\n

RT<\/sub> = ((TCR * Ra <\/sub>* Td<\/sub>)\/106<\/sup>) + Ra<\/sub><\/p>\n

Where:
\nRT<\/sub> = Resistance value at a given temperature
\nTCR = Temperature Coefficient of Resistance
\nRa<\/sub> = Resistance value at ambient
\nTd<\/sub> = Change in Temperature<\/p>\n

\"\"<\/a><\/p>\n


\nWheatstone Bridge and Scale Applications<\/span><\/p>\n

As you can see, with a typical TCR of 50ppm and a perfect tolerance, the resistance value will shift 0.25% at a temperature rise of only 50o<\/sup>C.\u00a0\u00a0 This shift could be on either side depending on whether the TCR is positive or negative.\u00a0\u00a0 Another way to think about the situation is that if the design criteria calls for a resistance tolerance of 0.1% then to remain within the design limits you should specify a 10ppm or better TCR.<\/p>\n

An example of an application where this may be important is the measurement of mass.\u00a0 This is typically accomplished using a scale.\u00a0 Scales may be used to measure the mass of gems, pharmaceuticals, or even larger items like construction equipment or bricks.\u00a0 Whether the scale is in a laboratory or located on a shop floor it is important that the instrument be accurate and consistent regardless of the environmental temperature.\u00a0 Most scales operate using the principal of a Wheatstone bridge as indicated in the image below.<\/p>\n

\"wheatstone<\/a>

Wheatstone Bridge<\/p><\/div>\n

Where:\u00a0 Vo = (R3\/(R3+R4) – R2\/(R1+R2)) x Vi<\/p>\n

The idea here is that when the ratio of R2\/R1 equals the ratio of R3\/R4 the voltage Vo will be zero.\u00a0 In simple terms the scale works by making one of the resistors variable due to mass.\u00a0\u00a0 Anything other than a zero output means the bridge is out of balance.\u00a0 The magnitude of this imbalance can then be correlated to mass.\u00a0 Because the system relies on fixed ratios it is extremely important that the resistance values remain as stable as possible, since any variation could potentially make the bridge unbalanced.<\/p>\n

Based on our knowledge of how TCR effects resistance value it is clear that a low TCR solution would be advantageous in these applications.\u00a0 Riedon offers a number of solutions to meet the most stringent requirements.\u00a0 Several of our low TCR solutions are presented below.<\/p>\n

\"low<\/a>

A few of Riedon’s low TCR options<\/p><\/div>\n

Datasheet links:
\nPrecision wirewound<\/a>
\nSAA \/ SMA \/ SCA \/ AA Series Precision Metal Film Resistors<\/a>
\nCAR series precision thin film chip resistors<\/a>
\nMF4200 precision thin film netoworks<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Minimize temperature coefficient of resistance (TCR) Temperature Coefficient of Resistance, or TCR, refers to how the value of a resistor will vary with changes in temperature.\u00a0 This temperature change can be from changes in the environment around the resistor as well the resistor heating itself as it dissipates power. Assuming a perfect tolerance resistor of […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-1567","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nTCR and resistors for scale applications - Riedon Company Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"TCR and resistors for scale applications - Riedon Company Blog\" \/>\n<meta property=\"og:description\" content=\"Minimize temperature coefficient of resistance (TCR) Temperature Coefficient of Resistance, or TCR, refers to how the value of a resistor will vary with changes in temperature.\u00a0 This temperature change can be from changes in the environment around the resistor as well the resistor heating itself as it dissipates power. Assuming a perfect tolerance resistor of […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/\" \/>\n<meta property=\"og:site_name\" content=\"Riedon Company Blog\" \/>\n<meta property=\"article:published_time\" content=\"2019-09-04T05:00:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-09-06T14:55:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/riedon.com\/blog\/wp-content\/uploads\/2019\/09\/scale-150x150.jpg\" \/>\n<meta name=\"author\" content=\"Frida Hovsepian\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Frida Hovsepian\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/\",\"url\":\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/\",\"name\":\"TCR and resistors for scale applications - Riedon Company Blog\",\"isPartOf\":{\"@id\":\"https:\/\/riedon.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/riedon.com\/blog\/wp-content\/uploads\/2019\/09\/scale-150x150.jpg\",\"datePublished\":\"2019-09-04T05:00:15+00:00\",\"dateModified\":\"2019-09-06T14:55:07+00:00\",\"author\":{\"@id\":\"https:\/\/riedon.com\/blog\/#\/schema\/person\/aefbc2f2d2d316159417534612d6dbce\"},\"breadcrumb\":{\"@id\":\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/#primaryimage\",\"url\":\"https:\/\/riedon.com\/blog\/wp-content\/uploads\/2019\/09\/scale.jpg\",\"contentUrl\":\"https:\/\/riedon.com\/blog\/wp-content\/uploads\/2019\/09\/scale.jpg\",\"width\":250,\"height\":250},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/riedon.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"TCR and resistors for scale applications\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/riedon.com\/blog\/#website\",\"url\":\"https:\/\/riedon.com\/blog\/\",\"name\":\"Riedon Company Blog\",\"description\":\"Resistors industry blog for manufacturers that use resistors\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/riedon.com\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/riedon.com\/blog\/#\/schema\/person\/aefbc2f2d2d316159417534612d6dbce\",\"name\":\"Frida Hovsepian\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/riedon.com\/blog\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/ec2db7b9597d0e8d9b6aaadb6882b301?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/ec2db7b9597d0e8d9b6aaadb6882b301?s=96&d=mm&r=g\",\"caption\":\"Frida Hovsepian\"},\"sameAs\":[\"http:\/\/www.riedon.com\"],\"url\":\"https:\/\/riedon.com\/blog\/author\/friedahovsepian\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"TCR and resistors for scale applications - Riedon Company Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/riedon.com\/blog\/tcr-resistors-scale-applications\/","og_locale":"en_US","og_type":"article","og_title":"TCR and resistors for scale applications - Riedon Company Blog","og_description":"Minimize temperature coefficient of resistance (TCR) Temperature Coefficient of Resistance, or TCR, refers to how the value of a resistor will vary with changes in temperature.\u00a0 This temperature change can be from changes in the environment around the resistor as well the resistor heating itself as it dissipates power. 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