{"id":276,"date":"2020-09-28T02:38:26","date_gmt":"2020-09-28T02:38:26","guid":{"rendered":"http:\/\/shirishpathare.com\/?page_id=276"},"modified":"2020-09-28T02:38:26","modified_gmt":"2020-09-28T02:38:26","slug":"thermistor-characteristics","status":"publish","type":"page","link":"https:\/\/sites.hbcse.tifr.res.in\/shirish\/index.php\/online-laboratory\/electronics\/thermistor-characteristics\/","title":{"rendered":"Thermistor Characteristics"},"content":{"rendered":"\n<p><strong>Objectives:<\/strong>&nbsp;To study the resistance- temperature characteristics of the thermistor.<\/p>\n\n\n\n<p><strong>Apparatus:<\/strong>&nbsp;Thermistor, mercury thermometer, beaker with water, heater assembly, digital multimeter<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/158.144.44.204\/shirish\/wp-content\/uploads\/2020\/09\/img_20200928_110048973.jpg?w=1024\" alt=\"\" class=\"wp-image-421\" width=\"692\" height=\"478\" \/><\/figure>\n\n\n\n<p><strong>Introduction:<\/strong><\/p>\n\n\n\n<p>Thermistors, like resistance temperature detectors (RTD), are thermally sensitive semiconductors whose resistance varies with temperature. Thermistors are manufactured from metal oxide semiconductor material encapsulated in a glass or epoxy bead. Thermistors have either a negative temperature coefficient (NTC) or a positive temperature coefficient (PTC). The first, more common, has a resistance that decreases with increasing temperature while the latter exhibits increased resistance with increasing temperature. Thermistors typically have a very high sensitivity (~200 \u03a9\/\u00b0C), making them extremely responsive to changes in temperature.<\/p>\n\n\n\n<p><strong>Procedure:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\" type=\"1\"><li>Note down the room temperature from mercury thermometer. Insert it in water and note down the initial temperature of water T<sub>0<\/sub>. (Click on the image to enlarge)<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"http:\/\/158.144.44.204\/shirish\/wp-content\/uploads\/2020\/09\/img_20200924_145453571.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/158.144.44.204\/shirish\/wp-content\/uploads\/2020\/09\/img_20200924_145453571.jpg?w=641\" alt=\"\" class=\"wp-image-402\" width=\"288\" height=\"453\" \/><\/a><figcaption>Initial Temperature of Water <em>T<sub>0<\/sub><\/em><\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\" id=\"block-3c16295a-7754-49ed-a82a-df178e322da7\"><li>Attach two terminals of thermistor to appropriate terminals of digital multimeter to measure resistance of the thermistor. Insert it in water and note down the initial reading of resistance <em>R<\/em><sub>0<\/sub>. (Click on the image to enlarge)<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"http:\/\/158.144.44.204\/shirish\/wp-content\/uploads\/2020\/09\/img_20200924_145937323-2.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/158.144.44.204\/shirish\/wp-content\/uploads\/2020\/09\/img_20200924_145937323-2.jpg?w=768\" alt=\"\" class=\"wp-image-400\" width=\"290\" height=\"386\" \/><\/a><figcaption>Thermistor reading for initial temperature of water <em>R<\/em><sub>0<\/sub><\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\" id=\"block-b430edd2-34fa-48df-ae93-f308608dfabf\"><li>Switch on the heater and note down thermistor readings for every 1<sup>o<\/sup>C rise in temperature upto 80<sup>o<\/sup>C. (Click on the image to enlarge)<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><a href=\"http:\/\/158.144.44.204\/shirish\/wp-content\/uploads\/2020\/09\/img_20200922_113512410.jpg\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/158.144.44.204\/shirish\/wp-content\/uploads\/2020\/09\/img_20200922_113512410.jpg?w=768\" alt=\"\" class=\"wp-image-398\" width=\"289\" height=\"385\" \/><\/a><figcaption>Setup for the study of Thermistor Characteristics<\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\" id=\"block-45c3c361-5b44-443c-8eb1-61ab808b7593\"><li>Watch the video and generate the data set for &#8220;heating&#8221;.<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-video wp-block-embed is-type-video is-provider-videopress\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"VideoPress Video Player\" aria-label='VideoPress Video Player' width='760' height='428' src='https:\/\/video.wordpress.com\/embed\/GeW120Jc?preloadContent=metadata&amp;hd=0&amp;cover=1' frameborder='0' allowfullscreen allow='clipboard-write'><\/iframe><script src='https:\/\/v0.wordpress.com\/js\/next\/videopress-iframe.js?m=1674852142'><\/script>\n<\/div><figcaption>Heating<\/figcaption><\/figure>\n\n\n\n<ul class=\"wp-block-list\" type=\"1\"><li>Once the temperature reaches 85<sup>o<\/sup>C, switch off the heater and now take same readings for cooling of water upto initial reading.&nbsp;<\/li><li>Watch the video and generate the data set for &#8220;cooling&#8221;.<\/li><\/ul>\n\n\n\n<figure class=\"wp-block-video wp-block-embed is-type-video is-provider-videopress\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"VideoPress Video Player\" aria-label='VideoPress Video Player' width='760' height='428' src='https:\/\/video.wordpress.com\/embed\/XIgAI7ab?preloadContent=metadata&amp;hd=0&amp;cover=1' frameborder='0' allowfullscreen allow='clipboard-write'><\/iframe><script src='https:\/\/v0.wordpress.com\/js\/next\/videopress-iframe.js?m=1674852142'><\/script>\n<\/div><\/figure>\n\n\n\n<ul class=\"wp-block-list\" type=\"1\"><li>Plot the graph for resistance vs temperature.&nbsp;<\/li><li>Plot the graph for ln(<em>R<\/em>) vs <em>T<\/em> and find the calibration equation for the thermistor.<\/li><\/ul>\n\n\n\n<p><strong>Observations:<\/strong><\/p>\n\n\n\n<p><em>T<\/em><sub>0<\/sub> = _______________<sup>o<\/sup>C<\/p>\n\n\n\n<p><em>R<\/em><sub>0<\/sub> =_______________\u03a9<\/p>\n\n\n\n<div class=\"wp-block-file\"><a href=\"http:\/\/158.144.44.204\/shirish\/wp-content\/uploads\/2020\/09\/therm_obs.xlsx\"><strong><em>Spreadsheet of the observation table<\/em><\/strong><\/a><a href=\"http:\/\/158.144.44.204\/shirish\/wp-content\/uploads\/2020\/09\/therm_obs.xlsx\" class=\"wp-block-file__button\" download>Download<\/a><\/div>\n\n\n\n<p>Plot a graph between <em>T<\/em> [X-axis] and ln(<em>R<\/em>) [Y-axis].<\/p>\n\n\n\n<p>The calibration equation for the thermistor is______________________________<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Objectives:&nbsp;To study the resistance- temperature characteristics of the thermistor. Apparatus:&nbsp;Thermistor, mercury thermometer, beaker with water, heater assembly, digital multimeter Introduction: Thermistors, like resistance temperature detectors (RTD), are thermally sensitive semiconductors whose resistance varies with temperature. Thermistors are manufactured from metal oxide semiconductor material encapsulated&#8230;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":410,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-276","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/sites.hbcse.tifr.res.in\/shirish\/index.php\/wp-json\/wp\/v2\/pages\/276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.hbcse.tifr.res.in\/shirish\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sites.hbcse.tifr.res.in\/shirish\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sites.hbcse.tifr.res.in\/shirish\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.hbcse.tifr.res.in\/shirish\/index.php\/wp-json\/wp\/v2\/comments?post=276"}],"version-history":[{"count":0,"href":"https:\/\/sites.hbcse.tifr.res.in\/shirish\/index.php\/wp-json\/wp\/v2\/pages\/276\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/sites.hbcse.tifr.res.in\/shirish\/index.php\/wp-json\/wp\/v2\/pages\/410"}],"wp:attachment":[{"href":"https:\/\/sites.hbcse.tifr.res.in\/shirish\/index.php\/wp-json\/wp\/v2\/media?parent=276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}