{"id":4411,"date":"2019-05-07T23:40:10","date_gmt":"2019-05-08T06:40:10","guid":{"rendered":""},"modified":"2023-06-27T13:44:25","modified_gmt":"2023-06-27T20:44:25","slug":"4411","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/4411","title":{"rendered":"Why can I only perform a one-point calibration with my Go Direct Conductivity sensor?"},"content":{"rendered":"<p>Unlike the LabQuest version of the <a href=\"https:\/\/www.vernier.com\/con-bta\">Conductivity Probe<\/a> which has three ranges that you change manually with a switch, the <a href=\"https:\/\/www.vernier.com\/gdx-con\">Go Direct Conductivity<\/a> automatically changes range based on the solution you are in. Because of this, the best way to calibrate it is to use a one-point calibration. A two-point calibration, essentially performing a linear fit, would actually worsen the accuracy of the sensor.<\/p>\n<p>This is also true for the <a href=\"https:\/\/www.vernier.com\/gdx-conpt\">Go Direct Platinum-Cell Conductivity<\/a> Sensor. The cabled version of the <a href=\"https:\/\/www.vernier.com\/conpt-bta\">Platinum-Cell Conductivity sensor<\/a> had a much smaller range and was able to be calibrated linearly quite well. When we increased the range on the <a href=\"https:\/\/www.vernier.com\/gdx-conpt\">Go Direct Platinum-Cell Conductivity<\/a> Sensor, it became nonlinear and auto-ranging. Therefore, a <a href=\"http:\/\/www.vernier.com\/til\/4011\">one-point calibration<\/a> is the most accurate way to calibrate it.<\/p>\n<p>See also <a href=\"\/til\/760\/\">Where do I get Conductivity Standards?<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Unlike the LabQuest version of the Conductivity Probe which has three ranges that you change manually with a switch, the Go Direct Conductivity automatically changes&#8230;<\/p>\n","protected":false},"author":11015,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[3856,690,4973,7332],"class_list":["post-4411","post","type-post","status-publish","format-standard","hentry","tag-cal","tag-calibration","tag-con","tag-gdxcon"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/4411","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/users\/11015"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=4411"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/4411\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=4411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=4411"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=4411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}