{"id":40224,"date":"2022-09-13T16:47:12","date_gmt":"2022-09-13T09:47:12","guid":{"rendered":"https:\/\/techmaster.com.vn\/?p=40224"},"modified":"2022-12-27T11:28:45","modified_gmt":"2022-12-27T04:28:45","slug":"dial-digital-dial-test-indicator-calibration","status":"publish","type":"post","link":"https:\/\/techmaster.com.vn\/en\/dial-digital-dial-test-indicator-calibration\/","title":{"rendered":"Dial &#8211; Digital &#8211; Dial Test Indicator Calibration"},"content":{"rendered":"<h2><a href=\"https:\/\/techmaster.com.vn\/wp-content\/uploads\/2022\/09\/dial-digital-dial-test-calibration-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-47700\" src=\"https:\/\/techmaster.com.vn\/wp-content\/uploads\/2022\/09\/dial-digital-dial-test-calibration-2.jpg\" alt=\"Dial - Digital - Dial Test Indicator Calibration\" width=\"1440\" height=\"795\" \/><\/a><\/h2>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #000000; font-size: 110%;\"><strong>Introduction Dial &#8211; Digital &#8211; Dial Test Indicator and Dial &#8211; Digital &#8211; Dial Test Indicator Calibration.<\/strong><\/span><\/h2>\n<h2><span style=\"color: #000000;\"><strong>1. Introduction Dial &#8211; Digital &#8211; Dial Test Indicator<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">Dial &#8211; Digital &#8211; Dial Test Indicator <span style=\"font-size: 14.4px;\">is a familiar device in the field of mechanical processing or construction. This device is used to check the height, thickness, and inversion of the parts. Flexible application when combined with other devices such as height ruler, stone table, magnetic base, centering device,&#8230;<\/span><\/span><\/p>\n<h2 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>2. <\/strong><strong>Dial &#8211; Digital &#8211; Dial Test Indicator Classification<\/strong><\/span><\/h2>\n<ul>\n<li><span style=\"color: #000000;\">Dial Indicator Standard Type: The measuring head and measuring axis can be moved up or down, measuring line from 0.002mm to 0.01mm and measuring range from 0 \u2013 1mm or 0 \u2013 5mm or 0 \u2013 10mm.<\/span><\/li>\n<\/ul>\n<ul>\n<li><span style=\"color: #000000;\">Dial Indicator (lever): Apply the principle of lever to amplify the movement of measuring head, the measuring head is small and the measuring angle can be changed freely. This meter has a small measuring range, usually less than 1mm, but the resolution is better: <span style=\"font-size: 14.4px;\">1\u00b5m, 2\u00b5m, 5\u00b5m.<\/span><\/span><\/li>\n<\/ul>\n<ul>\n<li><span style=\"color: #000000;\">Large Dial Indicator (long type): The\u00a0dial indicator is similar to the standard type, but has a larger measuring range. Measuring range from 20mm \u2013 100mm and graduated from 0.01mm or more.<\/span><\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>2.1. Standard Type<\/strong><\/span><\/h3>\n<p><span style=\"color: #000000;\">Structure and operation: Dial Indicator is a device with a structure consisting of: dial, set screw, rim, handle, ring indicator hands, measuring rod, measuring head, measuring rod guide bush and a number other parts. The long hand has a fine index, the short hand has a rough index. As the probe moves, the gear mechanism amplifies the reading on the dial.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"http:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/dong-ho-so-cau-tao.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-7403 size-full\" src=\"https:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/dong-ho-so-cau-tao.jpg\" alt=\"\u0110\u1ed3ng h\u1ed3 so lo\u1ea1i ti\u00eau chu\u1ea9n\" width=\"772\" height=\"346\" \/><\/a><\/span><\/p>\n<p><span style=\"color: #000000;\">Usage: the device is mounted on a stone table or base from the folding legs in the bushing. The measuring head is in contact with the measuring face (standard face), turn the dial to \u201c0\u201d to set the zero point. Lift the hand up a notch and feed the part above the reference face. Gently let the probe touch the part to be measured. Read the dial readings from the long and short hands. The standard surface here can be the stone table top, the face of the sample room or the position on the part to be compared.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\">For example with the clock in the picture above: the long hand rotates more than 2 turns and to 10, the short hand rotates one round past the number 1. The calculation of the result is: 1mm + 10*0.01mm = 1.10mm. Here one division corresponds to 0.01mm.<\/span><br \/>\n<span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"http:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/dong-ho-so-va-chan-de.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-7405 size-full\" src=\"https:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/dong-ho-so-va-chan-de.jpg\" alt=\"\u0110\u1ed3ng h\u1ed3 so lo\u1ea1i ti\u00eau chu\u1ea9n\" width=\"772\" height=\"346\" \/><\/a><\/span><br \/>\n<span style=\"color: #000000;\"><strong>2.2. <\/strong><\/span><span style=\"color: #000000;\"><strong>Dial Indicator Type<\/strong><\/span><\/h3>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">Structure and operation: Dial Indicator Type based on the lever principle, including a measuring head and a gear mechanism that magnifies the movement of the measuring head into a reading on the dial. This type has a shank that attaches to attachments such as a folding base, a stone table or a tall ruler.<\/span><br \/>\n<span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"http:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/cau-tao-dong-ho-so-chan-gap.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-7407 size-full\" src=\"https:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/cau-tao-dong-ho-so-chan-gap.jpg\" alt=\"\u0110\u1ed3ng h\u1ed3 so lo\u1ea1i ch\u00e2n g\u1eadp\" width=\"772\" height=\"346\" \/><\/a><\/span><\/p>\n<p><span style=\"color: #000000;\">Usage: the device is mounted on the base from the folding legs or the height gauge at the shank. The measuring head is in contact with the part to be compared. The angle of the measuring needle with the direction of the reference plane should not exceed 5o. Rotate the dial to zero to set the zero point. Rotate the part on the rotating platform, or level it with a level gauge, to determine the maximum difference in run-out or flatness.<\/span><br \/>\n<span style=\"color: #000000;\">For large angles \u03b8, it is necessary to multiply the compensation factor for the measured result. For example the measurement result is 0.200mm, the actual result is:<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\">_ With angle \u03b8 = 10o, complement coefficient is 0.98, result = 0.200*0.98 = 0.196mm<\/span><br \/>\n<span style=\"color: #000000;\">_ With angle \u03b8 = 20o, complement coefficient is 0.94, result = 0.200*0.94 = 0.188mm<\/span><br \/>\n<span style=\"color: #000000;\">_ With angle \u03b8 = 30o, complement coefficient is 0.86, result = 0.200*0.86 = 0.172mm<\/span><br \/>\n<span style=\"color: #000000;\">Note: the above coefficients are referenced from MITUTOYO company.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>3. Measurement methods<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">Comparative measurement method: Place the probe in contact with the position to be compared on the product detail. Rotate the watch face to \u201c0\u201d. Then insert the next measuring position to determine the deviation between the two positions. The comparative measurement method reduces errors caused by measurement conditions such as temperature errors, measuring force errors, assembly errors, manufacturing errors and subjective errors due to the observer.<\/span><\/p>\n<p><span style=\"color: #000000;\">Absolute measurement method: Place the probe in contact with the table. Adjust the meter to read 0 then put the detail into the measurement. The watch number will be the absolute size of the part.<\/span><\/p>\n<h2><span style=\"color: #000000;\"><strong>4. Why should we calibrate Dial &#8211; Digital &#8211; Dial Test Indicator?<\/strong><\/span><\/h2>\n<p><span style=\"color: #000000;\">The Dial Indicator is widely used in industries, in the detailed measurement of products. The device is used almost continuously and always requires high accuracy to provide reliable measurement results. Periodic calibration will ensure that the meter works correctly, ensure the quality of work, and monitor product quality.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5. <\/strong><\/span><span style=\"color: #000000;\"><strong>Dial &#8211; Digital &#8211; Dial Test Indicator Calibration<\/strong><\/span><\/h2>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5.1. <\/strong><b>Standard and supporting device <\/b><\/span><\/h3>\n<ul>\n<li class=\"p2\"><span style=\"color: #000000;\">Gauge Block Set grade 0, 1 or 2, better than 4 times accuracy of Unit Under Test (UUT).<\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Dial indicator calibrator: MITUTOYO UDT-2, UDT-3<\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Dimensional Length Measuring System (DMS)<\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Indicator Stand<\/span><\/li>\n<li class=\"p3\"><span style=\"color: #000000;\">Alcohol, lint-free cloth, gloves.<\/span><\/li>\n<\/ul>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5.2. <\/strong><b>Environment conditions <\/b><\/span><\/h3>\n<ul>\n<li class=\"p2\"><span style=\"color: #000000;\"><span class=\"s2\">Temperature: <\/span>(19 \u00b1 2)\u00baC<\/span><\/li>\n<li class=\"p3\"><span style=\"color: #000000;\"><span class=\"s2\">Relative Humidity<\/span>: (20 \u00f7 65)%RH<\/span><\/li>\n<\/ul>\n<p class=\"p4\"><span style=\"color: #000000;\">Note: environment conditions above apply for Techmaster inhouse laboratories. Outside this bound conditions will be considered with customer for uncertainty and measurement results<span class=\"s3\">. <\/span><\/span><\/p>\n<h3 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5.1. Preparation<\/strong><b><\/b><\/span><\/h3>\n<ul>\n<li class=\"p2\"><span style=\"color: #000000;\"><span class=\"s2\">V<\/span>isually inspect the UUT for obvious damage that may affect accuracy and\/or operation and note any observations. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Clean the contact rods; check moving smoothly. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Clean surface plate in the area of calibration, clean all gauge blocks, MITUTOYO UDT-2, UDT-3, measuring rods of DMS use for calibration. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">All UUT and Standard must cold to proper temperature conditions at least 1 hour before calibrated. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">UUT should be clamped on the surface plate with stand, indicator stand, or clamped on the clamp base of the DMS, UDT-2, UDT-3. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Technician must be familiar with calibration techniques and the operator manual of the UUT being calibrated. <\/span><\/li>\n<li class=\"p3\"><span style=\"color: #000000;\">Connect the UUT to an appropriate power source, if applicable <\/span><\/li>\n<\/ul>\n<h3><span style=\"color: #000000;\"><strong>5.4. <\/strong><b>Perform <\/b><\/span><\/h3>\n<h4 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5.4.1. <\/strong><b>1 Direction calibration method<\/b><\/span><\/h4>\n<h5><span style=\"color: #000000;\"><strong>5.4.1.1<\/strong> <b>Using Gauge Block Set and Surface plate <\/b><\/span><\/h5>\n<ul>\n<li class=\"p2\"><span style=\"color: #000000;\">Set up the test equipment as shown in Figure below.<\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Ensure the UUT plunger is perpendicular to the Serrated Anvil on the Surface Plate to eliminate cosine error.Preload the UUT plunger against the Serrated Anvil about 0.25mm or 0.010 inch. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Set zero on UUT by zero button, or rotate dial scale on the indicator to 0.<\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Select single Gage Blocks equal to about 25%, 50%, 75% and 100% of UUT full scale.<\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Other test point can be done follow customer\u2019s requirement.<\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Set the UUT to the correct range and resolution.<\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Place the Gage Block equal to about 25% of UUT full scale under the UUT probe tip using the lifting lever toraise the probe (if applicable), record value. <\/span><\/li>\n<li class=\"p3\"><span style=\"color: #000000;\">Repeat measure steps above for each remaining Gage Block size.<\/span><\/li>\n<\/ul>\n<h5><span style=\"color: #000000;\"><strong>5.4.1.2<\/strong> <b>Using Mitutoyo UDT-2, UDT-3<\/b><\/span><\/h5>\n<ul>\n<li class=\"p2\"><span style=\"color: #000000;\">Set zero on MITUTOYO UDT-2, UDT-3 dial scale. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Clamp UUT on UDT, plunger of UUT is perpendicular to Anvil Surface of UDT-2. For dial test indicator (folding leg), probe tip of UUT is close to horizontal with Anvil surface of UDT-3 to eliminate cosine error. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Preload the UUT probe tip against the UDT Anvil about 5~10 divisions. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Set zero on UUT. <\/span><\/li>\n<li class=\"p3\"><span style=\"color: #000000;\">Rotate dial scale UDT upward to create test points about 25%, 50%, 75% and 100% of UUT full scale, record values<span class=\"s3\">. <\/span><\/span><\/li>\n<\/ul>\n<h5><span style=\"color: #000000;\"><strong>5.4.1.3<\/strong> <b>Using DMS<\/b><\/span><\/h5>\n<ul>\n<li class=\"p2\"><span style=\"color: #000000;\">Clamp UUT on clamp base of DMS <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Plunger of UUT is perpendicular to Anvil Surface of DMS to eliminate cosine error. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Preload the UUT probe tip against the DMS Anvil about 5~10 divisions. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Set zero on UUT and DMS. <\/span><\/li>\n<li class=\"p3\"><span style=\"color: #000000;\">Using fine moving function of DMS, to the right direction, create test points about 25%, 50%, 75% and 100% of UUT full scale, record values. <\/span><\/li>\n<\/ul>\n<p><span style=\"color: #000000;\"><strong style=\"text-align: justify; font-size: 14.4px;\">5.4.2. <\/strong><b>2 Direction calibration method <\/b><\/span><\/p>\n<p class=\"p1\"><span style=\"color: #000000;\">This method apply for dial test indicator, pic-test indicator, which has reading 0-X-0 or X-0-X (X: number of devisions of reading scale range). <\/span><\/p>\n<h5 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5.4.2.1. <\/strong><b>Using UDT-2, UDT-3 <\/b><\/span><\/h5>\n<ul>\n<li class=\"p2\"><span style=\"color: #000000;\">Set zero on MITUTOYO UDT-2, UDT-3 dial scale. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Clamp UUT on UDT, plunger of UUT is perpendicular to Anvil Surface of UDT-2. For dial test indicator (folding leg), probe tip of UUT is close to horizontal with Anvil surface of UDT-3 to eliminate cosine error. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">For UUT has reading scale type 0-X-0, preload UUT probe tip against the UDT Anvil at X number, for UUT has reading scale type X-0-X, preload at 0. This is center scale indicating of UUT. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">For digital, electronic type of indicator, preload and set zero at this center scale indicating also. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Perform test for 2 directions: Positive direction (Clock Wise) and Negative direction (Counter-Clock Wise). Each direction will be done as below test points. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Rotate dial scale UDT upward to create test points about first 10 divisions, 50%, 75% and 100% of UUT left \/ right scale, record values. <\/span><\/li>\n<li class=\"p3\"><span style=\"color: #000000;\">Example for UUT 0-40-0 division, 1div. = 0.01mm, test points for left \/ right scale is 10,20,30,40 divisions. <\/span><\/li>\n<\/ul>\n<h5 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5.4.2.2. <\/strong><b>Using DMS <\/b><\/span><\/h5>\n<ul>\n<li class=\"p2\"><span style=\"color: #000000;\">Clamp UUT of DMS base same as 5.1.3. <\/span><\/li>\n<li class=\"p2\"><span style=\"color: #000000;\">Set zero on UUT and DMS same as 5.2.1 <\/span><\/li>\n<li class=\"p3\"><span style=\"color: #000000;\">Perform test for 2 directions, all test points are the same as 5.2.1. <\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"http:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/hieu-chuan-dong-ho-so-chan-gap.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7409 size-full\" src=\"https:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/hieu-chuan-dong-ho-so-chan-gap.jpg\" alt=\"Hi\u1ec7u chu\u1ea9n \u0111\u1ed3ng h\u1ed3 so lo\u1ea1i ch\u00e2n g\u1eadp\" width=\"772\" height=\"346\" \/><\/a><\/span><\/p>\n<p style=\"text-align: justify;\">Dial &#8211; Digital &#8211; Dial Test Indicator Calibration<\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><a style=\"color: #000000;\" href=\"http:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/hieu-chuan-dong-ho-so-ve-vach-chuan.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7411 size-full\" src=\"https:\/\/techmaster.com.vn\/wp-content\/uploads\/2020\/12\/hieu-chuan-dong-ho-so-ve-vach-chuan.jpg\" alt=\"Hi\u1ec7u chu\u1ea9n \u0111\u1ed3ng h\u1ed3 so lo\u1ea1i ti\u00eau chu\u1ea9n\" width=\"772\" height=\"346\" \/><\/a><\/span><\/p>\n<p style=\"text-align: justify;\">Dial Indicator Standard Type Calibration<\/p>\n<h4 style=\"text-align: justify;\"><span style=\"color: #000000;\"><strong>5.4.3. <\/strong><b>Thickness gauge indicator <\/b><\/span><\/h4>\n<ul>\n<li class=\"p2\">Release trigger clamp on UUT, 2 anvil of UUT are fully contact.<\/li>\n<li class=\"p2\">Set zero on UUT<\/li>\n<li class=\"p2\">Using gauge block size close to 25%, 50%, 75% and 100% of UUT measuring range.<\/li>\n<li class=\"p3\">Using UUT measure blocks above, record values.<\/li>\n<\/ul>\n<h2><span style=\"color: #000000;\">6. Tolerance<\/span><\/h2>\n<ul>\n<li class=\"p2\">Customer required tolerances are to be used for all calibrations unless otherwise noted.<\/li>\n<li class=\"p2\">If the customer does not supply instrument tolerances then manufacturing specifications or other approved sources are to be used as the default tolerance.<\/li>\n<li class=\"p3\">If not, non-judgement results will be applied.<\/li>\n<\/ul>\n<p><iframe loading=\"lazy\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/MFAaoFqdAc4\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-mce-fragment=\"1\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Introduction Dial &#8211; Digital &#8211; Dial Test Indicator and Dial &#8211; Digital &#8211; Dial Test Indicator Calibration. 1. Introduction Dial &#8211; Digital &#8211; Dial Test Indicator Dial &#8211; Digital &#8211; Dial Test Indicator is a familiar device in the field of mechanical processing or construction. This device is used to check the height, thickness, [&#8230;]\n","protected":false},"author":11,"featured_media":47700,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62,456],"tags":[],"class_list":["post-40224","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bai-viet-moi","category-calibration-process"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.8 (Yoast SEO v26.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Dial - Digital - Dial Test Indicator Calibration - Techmaster Electronics JSC<\/title>\n<meta name=\"description\" content=\"Dial - Digital - Dial Test Indicator is a familiar device in the field of mechanical processing or construction.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/techmaster.com.vn\/en\/dial-digital-dial-test-indicator-calibration\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dial - Digital - Dial Test Indicator Calibration\" \/>\n<meta property=\"og:description\" content=\"Dial - Digital - Dial Test Indicator is a familiar device in the field of mechanical processing or construction.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/techmaster.com.vn\/en\/dial-digital-dial-test-indicator-calibration\/\" \/>\n<meta property=\"og:site_name\" content=\"Techmaster Electronics JSC\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/techmaster.electronics.jsc\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-13T09:47:12+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-12-27T04:28:45+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/techmaster.com.vn\/wp-content\/uploads\/2022\/09\/dial-digital-dial-test-calibration-2.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1440\" \/>\n\t<meta property=\"og:image:height\" content=\"795\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Nguyen Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@techmastervn\" \/>\n<meta name=\"twitter:site\" content=\"@techmastervn\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguyen Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/techmaster.com.vn\/en\/dial-digital-dial-test-indicator-calibration\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/techmaster.com.vn\/en\/dial-digital-dial-test-indicator-calibration\/\"},\"author\":{\"name\":\"Nguyen Anh\",\"@id\":\"https:\/\/techmaster.com.vn\/en\/#\/schema\/person\/bdc3f98efb6bc75ff973a83d291575d1\"},\"headline\":\"Dial &#8211; 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