{"id":6233,"date":"2020-10-13T15:06:59","date_gmt":"2020-10-13T09:36:59","guid":{"rendered":"http:\/\/astan.lk\/al_virtualclassroom\/?p=6233"},"modified":"2020-10-13T15:06:16","modified_gmt":"2020-10-13T09:36:16","slug":"measurement-instruments","status":"publish","type":"post","link":"https:\/\/astan.lk\/al_virtualclassroom\/measurement-instruments\/","title":{"rendered":"Measuring instruments"},"content":{"rendered":"<p><strong>Length &#8211;\u00a0<\/strong>Meter ruler , Vernier caliper , Micrometer screw guage , Spectrometer , Travelling microscope<\/p>\n<p><strong>Mass &#8211;\u00a0<\/strong>Electronic balance , Triple beam balance<\/p>\n<p><strong>Time &#8211;\u00a0<\/strong>Stop watch , Digital clock<\/p>\n<p style=\"text-align: left;\"><strong>\u00a0 \u00a0 \u00a0 <\/strong><strong>Least<\/strong><strong> count<\/strong><\/p>\n<ul>\n<li style=\"text-align: left;\">It is the least value of physical quantity which can be measured using a measuring instrument.<\/li>\n<\/ul>\n<p><strong><span style=\"text-decoration: underline;\">Vernier caliper<\/span><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/download-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6991\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/download-2-300x112.jpg\" alt=\"download\" width=\"354\" height=\"132\" \/><\/a><\/p>\n<p>Internal jaws &#8211; for measuring inner dimensions<\/p>\n<p>External jaws &#8211; for measuring outer dimensions<\/p>\n<p>Depth bar &#8211; for measuring depths<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/dv.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7027 aligncenter\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/dv.png\" alt=\"dv\" width=\"199\" height=\"101\" \/><\/a>Least count = 0.1 mm<\/p>\n<p>Reading =main scale reading + vernier scale coincide \u00d7 least count = 100+2\u00d70.1=100.2 mm<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Zero error and correction<\/strong><\/p>\n<p>The instrument is said to have \u00a0if the zero of the main scale doesn&#8217;t coincide with the zero of the vernier scale when the two jaws of vernier caliper are brought into contact.<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/kk.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-6995 alignleft\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/kk.png\" alt=\"kk\" width=\"295\" height=\"288\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Zero error = 0.3 mm<\/p>\n<p>Correction = -0.3 mm<\/p>\n<p>Zero error = 0.8 mm<\/p>\n<p>Correction = +0.8 mm<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"text-decoration: underline;\">Micrometer screw guage<\/span><\/strong><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/download-3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-6998\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/download-3.jpg\" alt=\"download\" width=\"336\" height=\"139\" \/><\/a><\/p>\n<p><strong>Pitch &#8211;\u00a0<\/strong>It is the linear distance moved by thimble along the main scale when the thimble is given one rotation.<\/p>\n<p><strong>Least count =<\/strong>\u00a0\u00a0Pitch\/Number of divisions in the circular scale<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/m.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7031 aligncenter\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/m.png\" alt=\"m\" width=\"122\" height=\"107\" \/><\/a>Main scale &#8211; \u00a00.5 mm divisions \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Least count=0.01mm<\/p>\n<p>Reading = 2.5 + 38\u00a0\u00d70.01 = 2.88 mm<\/p>\n<p><span style=\"text-decoration: underline;\"><strong>Zero error and correction<\/strong><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Spherometer<\/strong><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/spherometer-4-638.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7018\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/spherometer-4-638.jpg\" alt=\"spherometer-4-638\" width=\"342\" height=\"257\" \/><\/a><\/p>\n<p>Pitch = It&#8217;s the linear distance moved along main scale when circular scale is given one completed \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 rotation.<\/p>\n<p>Least count = Pitch\/Number of divisions in the circular scale.th<strong>Determination of the radius of curvature of a spherical surface<\/strong><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>Take a plain glass block and keep the spherometer on it and turn the screw until tip of the screw just touch the glass block and take the reading(h<sub>1<\/sub>)<\/li>\n<li>Then keep the curved surface on the glass block<\/li>\n<li>Keep the spherometer on the curved surface and turn the screw until it just touch the curved surface and take the reading(h<sub>2<\/sub>)<\/li>\n<li>The height moved by the screw h = h<sub>2<\/sub>-h<sub>1<\/sub><\/li>\n<\/ul>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/images-1-3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7019 alignleft\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/images-1-3.png\" alt=\"images (1)\" width=\"257\" height=\"196\" \/><\/a><\/p>\n<p>R = a<sup>2<\/sup>\/6h + h\/2<\/p>\n<p>&nbsp;<\/p>\n<p>a = distance between two legs<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Travelling microscope<\/strong><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/images.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7034\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/images.jpg\" alt=\"images\" width=\"194\" height=\"194\" \/><\/a><\/p>\n<p>The principle component of a travelling microscope is it&#8217;s microscope. It enlarges the diameter so measurement can be done easily.<\/p>\n<h2><em>To find the internal diameter of the capillary tube\u00a0<\/em><\/h2>\n<ul>\n<li>Place the capillary tube horizontally on the adjustable stand.<\/li>\n<li>Focus the microscope on the end dipped in water.<\/li>\n<li>Make the horizontal cross- wire touch the inner circle at A (fig i). Note microscope reading on the vertical scale.<\/li>\n<li>Raise the microscope to make the horizontal cross wire touch the circle at B (fig ii). Note the vertical scale reading.<\/li>\n<li>The difference between the two readings will give the vertical internal diameter (AB) of the tube.<\/li>\n<li>Move the microscope on the horizontal scale and make the vertical cross wire touch the inner circle at C (fig iii). Note microscope reading on the horizontal scale.<\/li>\n<li>Move the microscope to the right to make the vertical cross wire touch the circle at D \u00a0(fig iv). Note the horizontal scale reading.<\/li>\n<li>The difference between the two readings will give the horizontal internal diameter (CD) of the tube.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"http:\/\/amrita.olabs.co.in\/userfiles\/1\/1433220363_123.jpg\" alt=\"\" \/><\/p>\n<ul>\n<li>We can calculate the diameter of the tube by calculating the mean of the vertical and horizontal internal diameters. Half of the diameter will give the radius of the capillary tube.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Length &#8211;\u00a0Meter ruler , Vernier caliper , Micrometer screw guage , Spectrometer , Travelling microscope Mass &#8211;\u00a0Electronic balance , Triple beam balance Time &#8211;\u00a0Stop watch , Digital clock \u00a0 \u00a0 \u00a0 Least count It is the least value of physical quantity which can be measured using a measuring instrument. Vernier caliper &nbsp; Internal jaws &#8211; [&hellip;]<\/p>\n","protected":false},"author":842,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[16,1944],"tags":[],"class_list":["post-6233","post","type-post","status-publish","format-standard","hentry","category-physics","category-unit-01-physics"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Measuring instruments - Learning &amp; Education Portal<\/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:\/\/astan.lk\/al_virtualclassroom\/measurement-instruments\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Measuring instruments - Learning &amp; Education Portal\" \/>\n<meta property=\"og:description\" content=\"Length &#8211;\u00a0Meter ruler , Vernier caliper , Micrometer screw guage , Spectrometer , Travelling microscope Mass &#8211;\u00a0Electronic balance , Triple beam balance Time &#8211;\u00a0Stop watch , Digital clock \u00a0 \u00a0 \u00a0 Least count It is the least value of physical quantity which can be measured using a measuring instrument. 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