{"id":1019,"date":"2010-11-17T13:11:46","date_gmt":"2010-11-17T18:11:46","guid":{"rendered":"http:\/\/embedded-lab.com\/blog\/?p=1019"},"modified":"2012-07-30T09:29:30","modified_gmt":"2012-07-30T13:29:30","slug":"calibrating-a-thermistor-for-temperature-measurements","status":"publish","type":"post","link":"https:\/\/embedded-lab.com\/blog\/calibrating-a-thermistor-for-temperature-measurements\/","title":{"rendered":"Calibrating a thermistor for temperature measurements"},"content":{"rendered":"<p>A thermistor is a passive device that changes its resistance with temperature. If the temperature-resistance characteristic is known, it can be used as a temperature sensor by measuring the resistance, or more precisely, the voltage across it. Thermistors are classified in to two types: NTC (negative temperature coefficient) and PTC (positive temperature coefficient). A NTC thermistor decreases its resistance while the temperature rises, and a PTC does the opposite.<\/p>\n<p style=\"text-align: center;\"><a rel=\"attachment wp-att-1021\" href=\"http:\/\/embedded-lab.com\/blog\/?attachment_id=1021\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-1021 aligncenter\" title=\"ThermistorTut\" src=\"http:\/\/embedded-lab.com\/blog\/wp-content\/uploads\/2010\/11\/ThermistorTut.jpg\" alt=\"\" width=\"570\" height=\"370\" srcset=\"https:\/\/embedded-lab.com\/blog\/wp-content\/uploads\/2010\/11\/ThermistorTut.jpg 570w, https:\/\/embedded-lab.com\/blog\/wp-content\/uploads\/2010\/11\/ThermistorTut-550x357.jpg 550w\" sizes=\"auto, (max-width: 570px) 100vw, 570px\" \/><\/a><\/p>\n<p>Although the datasheet of a thermistor describes the temperature-resistance relationship, the measurement based on that is not very accurate. Therefore, you may need to calibrate it against a more accurate sensor. This article describes about calibrating a 10K thermistor against a DS1621 temperature sensor, which is a very precise digital temperature sensor. With a series of readings from both the sensor, you can see if the relationship between the temperature and resistance of the thermistor is linear or not.<br \/>\n<!--more--><\/p>\n<table style=\"border-collapse: collapse; width: 100%;\">\n<tbody>\n<tr>\n<td><script type=\"text\/javascript\">\/\/ <![CDATA[\n      google_ad_client = \"pub-3251335376149574\"; \/* Embedded-Lab_Blog_468x15, created 10\/1\/10 *\/ google_ad_slot = \"5007918417\"; google_ad_width = 468; google_ad_height = 15;\n\/\/ ]]><\/script><br \/>\n<script src=\"http:\/\/pagead2.googlesyndication.com\/pagead\/show_ads.js\" type=\"text\/javascript\">\n<\/script><\/td>\n<td><a href=\"http:\/\/pcbheaven.com\/exppages\/Experimenting_with_a_thermistor\/\" target=\"_blank\"><strong>Read More<\/strong><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>A thermistor is a passive device that changes its resistance with temperature. If the temperature-resistance characteristic is known, it can be used as a temperature sensor by measuring the resistance, or more precisely, the voltage across it. Thermistors are classified in to two types: NTC (negative temperature coefficient) and PTC (positive temperature coefficient). A NTC thermistor decreases its resistance while the temperature rises, and a PTC does the opposite. Although the datasheet of a thermistor describes the temperature-resistance relationship, the measurement based on that is not very accurate. Therefore, you may need to calibrate it against a more accurate sensor.<\/p>\n","protected":false},"author":2,"featured_media":1021,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29,4,38],"tags":[103,102,101],"class_list":["post-1019","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-embedded-lessons","category-pic-projects","category-pic-tutorials","tag-calibration","tag-temperature-sensor","tag-thermistor"],"_links":{"self":[{"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/posts\/1019","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/comments?post=1019"}],"version-history":[{"count":11,"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/posts\/1019\/revisions"}],"predecessor-version":[{"id":5827,"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/posts\/1019\/revisions\/5827"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/media\/1021"}],"wp:attachment":[{"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/media?parent=1019"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/categories?post=1019"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/embedded-lab.com\/blog\/wp-json\/wp\/v2\/tags?post=1019"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}