On Thu, Sep 17, 2015 at 8:48 AM, Erik Christiansen <dva...@internode.on.net> wrote: > 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.
Yeah, I figured that. I bought the thing mainly for the quick and dirty transistor/diode checking. If I really want to get into profiling transistors or diodes, I've got a Tek 577 Curve Tracer to do that. I've mainly used the tester just to get decent capacitance readings on the cap side of the house. I've got a really good ESR that I use to really check electrolytics. > >> 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 Eh, he couldn't do any worse than the clowns that currently occupy DC. Mark -- One Man, One Machine, One Computer! <VBSEG> ------------------------------------------------------------------------------ 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
