{"id":345,"date":"2009-02-19T00:18:33","date_gmt":"2009-02-19T08:18:33","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T07:00:00","slug":"345","status":"publish","type":"post","link":"https:\/\/www.vernier.com\/til\/345","title":{"rendered":"What is the input impedance of the Current and Voltage Probe System (CV-BTA or CV-DIN)?"},"content":{"rendered":"<p>Note that the Current & Voltage Probe System (NO LONGER AVAILABLE) (CV-BTA, <em>discontinued<\/em>) is no longer available, and has been replaced by the combination of:<br \/>\n<a href=\"\/product\/current-probe\/\">Current Probe<\/a> (<nobr>DCP-BTA<\/nobr>) and<br \/>\n<a href=\"\/product\/differential-voltage-probe\/\">Differential Voltage Probe<\/a> (<nobr>DVP-BTA<\/nobr>)<\/p>\n<p>The Dual Channel Amplifier (the box part of the CV system) consists of two independent differential amplifiers. Each amplifier has two input leads, a + lead and a &#8211; lead. In order to have to reading default to zero when no sensor is attached, we have a resistor on each + and &#8211; input (specified below). In order to have the reading be zero when only one lead is attached, we have a resistor between the + and &#8211; input. <\/p>\n<p>Resistor values:<br \/>\nResistance to ground (+ input or &#8211; input)<br \/>\nCV-DIN = 1M ohm (model used with ULI and SBI)<br \/>\nCV-BTA = 10M ohm (model used with CBL,CBL2, and LabPro)<\/p>\n<p>Resistance between leads (+ input to &#8211; input)<br \/>\nCV-DIN = 10K ohm (model used with ULI and SBI)<br \/>\nCV-BTA = 1M ohm (model used with CBL,CBL2, and LabPro)<\/p>\n<p>These resistors result in a relatively low input impedance. Because the system is primarily used on &#8220;bulb and battery&#8221; type of circuits, this is usually not a problem. If the low input impedance is a problem, the easiest solution is to use a smaller resistor in whatever circuit that is being monitored. If this is not an option, contact our Tech Support dept to discuss other options.<\/p>","protected":false},"excerpt":{"rendered":"<p>Note that the is no longer available, and has been replaced by the combination of: and The Dual Channel Amplifier (the box part of the&#8230;<\/p>\n","protected":false},"author":31,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[],"tags":[267,268,61,266],"class_list":["post-345","post","type-post","status-publish","format-standard","hentry","tag-current-and-voltage","tag-cv-bta","tag-cv-din","tag-impedance"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/345","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\/31"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/comments?post=345"}],"version-history":[{"count":0,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/posts\/345\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/media?parent=345"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/categories?post=345"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vernier.com\/til\/wp-json\/wp\/v2\/tags?post=345"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}