{"id":6022,"date":"2018-01-03T06:35:06","date_gmt":"2018-01-03T06:35:06","guid":{"rendered":"http:\/\/www.pa4tim.nl\/?p=6022"},"modified":"2018-01-03T06:35:06","modified_gmt":"2018-01-03T06:35:06","slug":"duoyi-dy294-component-and-isolation-tester","status":"publish","type":"post","link":"https:\/\/www.pa4tim.nl\/meetapparatuur\/duoyi-dy294-component-and-isolation-tester\/","title":{"rendered":"Duoyi DY294 component and isolation tester"},"content":{"rendered":"<p><iframe loading=\"lazy\" title=\"Teardown and modification of a Duoyi DY294 component tester\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/7_oBBoEkQSI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Video review<\/p>\n<div id=\"attachment_6031\" style=\"width: 650px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_front.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-6031\" class=\"wp-image-6031 size-large\" src=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_front-1024x631.jpg\" alt=\"\" width=\"640\" height=\"394\" srcset=\"https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_front-1024x631.jpg 1024w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_front-300x185.jpg 300w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_front-768x473.jpg 768w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_front.jpg 1869w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><p id=\"caption-attachment-6031\" class=\"wp-caption-text\">The front<\/p><\/div>\n<p>This is a small battery powered transistor tester but it can do more. It can test Vbr, hFE, Vce sat and&nbsp; Iceo. It can test transistors, fets, diodes, leds, zeners, SCR, isolation of MOVs, capacitors, etc<\/p>\n<p><strong>hFE<\/strong>, also called Beta is the DC amplification parameter. It is the ratio between the base current and collector current. There is also hfe, or alfa, the small signal amplification parameter. This is the ratio between the change in base current and the change in collector current.&nbsp; Beta is not a constant. It is not lineair. This tester has 3 different base currents, 10 uA, 1mA and 10mA. Be careful, you can fry a transistor in a flash. As soon as you set the switch on a hFE position it starts measuring. I had rather seen that the pushbutton worked for all functions and not only for HV. Voltage is max 6V, Ic is 2A foor the 1mA and 10mA range and 58uA for the 10uA range.<\/p>\n<p>Measured: Ic: 2A, 2A, 58uA, at 5,98V<br \/>\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Ib: 9,979mA, 0,996mA, 9,92 uA at 5,98V<\/p>\n<p><strong>Vbr<\/strong>, the breakdown voltage&nbsp; is for isolation testing. It generates 1500 or 270Vdc and shows the voltage the component breaks down. You can use this also to test f.i. zeners. The current is low, 544uA for the 1000V range and 712uA for the 200V range.<\/p>\n<p>Measured, Ice: 544 uA at 1622V and 712 uA at 234,8V<\/p>\n<p><strong>Vce(sat)<\/strong> is the saturation voltage, this is the voltdrop over collector and emitter. This must be very low for switching semiconductors so the dissipation is low. Open voltage is 6V. Ic is 2A, 800mA, 100mA or 10mA<\/p>\n<p>Measured, Ice: 1,94A, 0,829A, 100mA, 9,436mA<br \/>\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Ib:&nbsp; 150mA, 76mA, 9,9mA, 0,979mA&nbsp;<br \/>\n&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<\/p>\n<p><strong>Ice,<\/strong> this is a leakage current measurement. It has 1 uA resolution. The voltage is 26V, max current is 2000uA<\/p>\n<p>Measured: 1660uA and 26,25V<br \/>\nDMM&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; DY294<br \/>\n1657uA&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1670<br \/>\n2,66uA&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0002<br \/>\n1660uA&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1665<br \/>\n1188,4uA&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1191<br \/>\n518,36uA&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;511<br \/>\n259,97uA&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 260<\/p>\n<p>The capacitor connectors are to test the Vbr or Ico of capacitors (not for electrolytics) However, the Ice is usable for low voltage electrolytics.&nbsp;<\/p>\n<div id=\"attachment_6030\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_batt.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-6030\" class=\"wp-image-6030 size-medium\" src=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_batt-300x217.jpg\" alt=\"\" width=\"300\" height=\"217\" srcset=\"https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_batt-300x217.jpg 300w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_batt-768x557.jpg 768w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_batt-1024x742.jpg 1024w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/Duoyi_DY294_batt.jpg 1340w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-6030\" class=\"wp-caption-text\">4 batteries or an external 6Vdc<\/p><\/div>\n<p>It uses 4 AA batteries or an external 6Vdc powersupply. For the Vce 2A and 800mA you need the external psu.&nbsp;&nbsp;<\/p>\n<p>Soldering was not great to put it mildly.&nbsp;<\/p>\n<p><a href=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8278.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6025 size-medium\" src=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8278-300x194.jpg\" alt=\"\" width=\"300\" height=\"194\" srcset=\"https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8278-300x194.jpg 300w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8278-768x497.jpg 768w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8278-1024x663.jpg 1024w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8278.jpg 2007w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The main pcb. Right top is the HV part<\/p>\n<p><a href=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8282.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6029 size-medium\" src=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8282-300x191.jpg\" alt=\"\" width=\"300\" height=\"191\" srcset=\"https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8282-300x191.jpg 300w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8282-768x489.jpg 768w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8282-1024x652.jpg 1024w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8282.jpg 1809w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Under the display is a blobbed IC<\/p>\n<p><a href=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8276.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6023 size-medium\" src=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8276-300x199.jpg\" alt=\"\" width=\"300\" height=\"199\" srcset=\"https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8276-300x199.jpg 300w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8276-768x510.jpg 768w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8276-1024x680.jpg 1024w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8276.jpg 1300w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Piggyback board with the current resistors.<\/p>\n<p><a href=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8277.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6024 size-medium\" src=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8277-300x139.jpg\" alt=\"\" width=\"300\" height=\"139\" srcset=\"https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8277-300x139.jpg 300w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8277-768x355.jpg 768w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8277-1024x473.jpg 1024w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8277.jpg 1746w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Backside of piggyback board<\/p>\n<p><a href=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8281.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6028 size-medium\" src=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8281-300x249.jpg\" alt=\"\" width=\"300\" height=\"249\" srcset=\"https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8281-300x249.jpg 300w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8281-768x636.jpg 768w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8281.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>The zero position of the knob<\/p>\n<p><a href=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8279.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6026 size-medium\" src=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8279-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8279-300x300.jpg 300w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8279-150x150.jpg 150w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8279-768x765.jpg 768w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8279.jpg 900w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a> <a href=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8280.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-6027 size-medium\" src=\"http:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8280-300x258.jpg\" alt=\"\" width=\"300\" height=\"258\" srcset=\"https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8280-300x258.jpg 300w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8280-768x662.jpg 768w, https:\/\/www.pa4tim.nl\/wp-content\/uploads\/2018\/01\/DSC8280.jpg 975w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Location of the contacts. Be careful, they lay more or less loose on the disk.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Video review This is a small battery powered transistor tester but it can do more. It can test Vbr, hFE, Vce sat and&nbsp; Iceo. It can test transistors, fets, diodes, leds, zeners, SCR, isolation of MOVs, capacitors, etc hFE, also &hellip; <a class=\"more-link\" href=\"https:\/\/www.pa4tim.nl\/meetapparatuur\/duoyi-dy294-component-and-isolation-tester\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[31,9],"tags":[],"class_list":["post-6022","post","type-post","status-publish","format-standard","hentry","category-bridges","category-meetapparatuur"],"_links":{"self":[{"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/posts\/6022","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/comments?post=6022"}],"version-history":[{"count":5,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/posts\/6022\/revisions"}],"predecessor-version":[{"id":6036,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/posts\/6022\/revisions\/6036"}],"wp:attachment":[{"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/media?parent=6022"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/categories?post=6022"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pa4tim.nl\/wp-json\/wp\/v2\/tags?post=6022"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}