Path: csiph.com!eternal-september.org!feeder.eternal-september.org!nntp.eternal-september.org!.POSTED!not-for-mail From: "Don" Newsgroups: sci.electronics.design Subject: Re: CoB LED filament analysis Date: Tue, 21 Apr 2026 14:39:14 -0000 (UTC) Organization: A noiseless patient Spider Lines: 36 Message-ID: <20260421a@crcomp.net> References: <20260411a@crcomp.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Tue, 21 Apr 2026 14:39:15 +0000 (UTC) Injection-Info: dont-email.me; posting-host="55d1dd6df35d5c1e7ec3894686ebf19d"; logging-data="1657712"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/IYsoqSLO7U5A7YE49R7DD" Cancel-Lock: sha1:nrP1iLuy3c8hj1yGlOJklzPewkM= Xref: csiph.com sci.electronics.design:743194 Don wrote: > Recent thread topic transitioned to a tentative opinion on a work-in- > progress webpage: > > > > Radiography imparts interesting insight. Second opinions welcome! > The current waveform flopped. Any advice on how to use a Fluke > 80i-1000s connected to a Tek 2465B to display the 120 VAC current > wave is appreciated in advance. Also, what does "P2 < P1" signify on > the current probe? Alright you guys, a couple of current curve images are now available on the webpage. For the present case, in regards to the probe's "P2 < P1" orientation decal, P1 designates Line while P2 indicates Neutral. The probe provides a sharper, cleaner curve compared to the resistor. Both curves illustrate how the silicon filament primarily presents itself as a capacitive load. The filament's high voltage combined with its low amperage degrades resistor curve quality. It took a 10 M ohm resistive current sensor for the half-wave rectification effect to become visible. The probe curve's mostly blue trace shows the peak-to-peak Line voltage. It's used to properly trigger the scope. (Perhaps the scope's line trigger accomplishes the same result with less effort?) The probe curve's mostly green trace shows the current, with peaks and valleys created by half-wave rectification at each end of the filament. The current curve is set to 2mV per division. Does anyone know how to transpose it to mA? Danke, -- 73, Don, WD7Q veritas _|_ liberabit | https://www.qsl.net/wd7q vos |