On 17.09.15 05:54, Mark Wendt wrote: > I haven't checked my transistor/cap tester against a real ESR meter I > have for my bench, so I don't know how accurate it is at that. My > electronics stuff is all packed up right now, waiting to be put in the > moving van, so I won't have a chance to play for a while.
For a quick reality check, I just wired a 1 ohm wirewound power resistor in series with the cap. Now it reads 1.2 ohms. With resistor tolerance and inductance, that's not too far off. Adding instead, a 0.02 ohm 1% non-wirewound, the reading jumps from 0.05 to 0.17 ohm. My lead clips are not making zero ohm connections. Just the leads and resistor reads 0.1 ohms. And yet it repeatedly gives 0.03 to 0.05 ohms for the capacitor ESR. There's no elaborate precision analogue circuitry in the thing, so we can't hope for more than an approximate result. For me, it is enough that it discriminates between 0.8 ohms and 0.05, and whether that 0.05 is really 0.03 or 0.07 is no biggie. > We close on October 15th (hopefully), and then I put Washington DC in > the rear view mirror. That's the strongest reaction I've yet heard to the prospect of "The Donald" maybe heading into town after the incumbent leaves. Erik -- Bureaucrat behind desk: "You need a planning permit to continue farming" Aussie farmer: "I need my head read if I want to continue farming" - Chris Rule cartoon in the Weekly Times, 05.08.15 ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
