{"id":2898,"date":"2014-04-09T21:19:09","date_gmt":"2014-04-10T02:19:09","guid":{"rendered":"http:\/\/www.summet.com\/blog\/?p=2898"},"modified":"2014-04-09T21:19:09","modified_gmt":"2014-04-10T02:19:09","slug":"onetesla-o-scope-traces","status":"publish","type":"post","link":"https:\/\/www.summet.com\/blog\/2014\/04\/09\/onetesla-o-scope-traces\/","title":{"rendered":"OneTesla O-scope traces"},"content":{"rendered":"

I have reduced my primary to 5 turns, and using the standard 0.068 MFD tank cap, this is the general shape of my oneTesla output waveform (as captured by a scope probe hanging in the air about 3 feet away from the coil):
\n\"Screen<\/a><\/p>\n

As you can see, the primary rings up and then the secondary oscillates for quite a while afterwards. <\/p>\n

The next three traces are running the coil at a very low power level. Depending upon where I measure between peaks on the trace, I get different frequencies:<\/p>\n

\"Screen<\/a>
\n277 kHz<\/p>\n

\"Screen<\/a>
\n294 kHz<\/p>\n

\"Screen<\/a><\/p>\n

17.80 uS between five peaks, or 1 \/ (3.56 \/ 1000000) = 280 kHz<\/p>\n

As the 280 is between the 277 and the 294, we’ll just say that my primary has a resonant frequency of 280 kHz, when at low power. <\/p>\n

Next, I turned the power up a bit (around 1\/3 of the way up) and got the following two measurements: <\/p>\n

\"Screen<\/a>
\n263 kHz<\/p>\n

\"Screen<\/a>
\n18.40 uS for 5 peaks, or 1 \/ (3.68 \/ 1000000) = 272 kHz<\/p>\n

So my primary resonance is somewhere between 263 and 294 depending upon how I measure it, with a value of 272-280 looking to be a reasonable average.<\/p>\n

Surprisingly, my secondary resonance measurements agreed with themselves a bit better. Here is the low power trace:
\n\"Screen<\/a><\/p>\n

And the “Mid Power” trace.
\n\"Screen<\/a>
\n(You can see the primary ringing extending out so that it becomes visible in the trace…)<\/p>\n

In both cases, I measured 15.20 uS between 5 peaks or
\n1 \/ (3.04 \/ 1000000) = 329 kHz<\/p>\n

So my ratio is currently 329 \/ 280 or 1.175 ( Secondary 17-18% higher than my primary). <\/p>\n","protected":false},"excerpt":{"rendered":"

I have reduced my primary to 5 turns, and using the standard 0.068 MFD tank cap, this is the general shape of my oneTesla output waveform (as captured by a scope probe hanging in the air about 3 feet away … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,13],"tags":[114],"class_list":["post-2898","post","type-post","status-publish","format-standard","hentry","category-commentary","category-projects","tag-onetesla"],"_links":{"self":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/2898","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/comments?post=2898"}],"version-history":[{"count":0,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/2898\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/media?parent=2898"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/categories?post=2898"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/tags?post=2898"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}