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: Wed, 22 Apr 2026 17:10:51 -0000 (UTC) Organization: A noiseless patient Spider Lines: 46 Message-ID: <20260422a@crcomp.net> References: <20260411a@crcomp.net> <20260421a@crcomp.net> <2mqhuk9stmli0ql43nkg8tl62r14cj2eq3@4ax.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Wed, 22 Apr 2026 17:10:52 +0000 (UTC) Injection-Info: dont-email.me; posting-host="c7b8b181bc4b6a506454a32ce9f69a73"; logging-data="2550950"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+PhTfP3XCwvT6jXxcOKmo3" Cancel-Lock: sha1:i0jEX5MdarQybtD5n1ZFUggFs8g= Xref: csiph.com sci.electronics.design:743242 JM wrote: > Don wrote: >>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? > > You're faffing about. Make a cup of tea, sit down and think for a > minute. What does a forking fantasy about faffing have to do with your bright idea to use a series resistor to create a current curve? 1, 10, 100, 10K, 100K, 1M series resistors all show slightly attenuated 320 VAC. What do you think about that? Danke, -- 73, Don, WD7Q veritas _|_ liberabit | https://www.qsl.net/wd7q vos |