Hi Magnus, I very much doubt you could get anything useful out of a TDR. There is no reason I can think of that a power rail should look anything like a transmission line and the rail should be an AC short every inch or so.
FWIW, -John ============ > On 03/23/2012 09:30 PM, J. Forster wrote: >> I should have added that you can get a pretty good idea of whick branch >> on >> a PCB is drawing current by probing along the trace. This is especially >> useful if the rail has a bunch of branch distribution lines. >> >> Also, if the three-terminal regulator is overheating, disconnect it and >> power just that rail from an external, current limited supply of a volt >> or >> two. That way you don't risk trace damage. > > I would toss the TDR on it just for the fun of it, but a miliohm > measurement should also help to locate it. Otherwise if there is no > direct evidence (hot cap or other chip) lifting legs of caps on > speculation can be a starter. > > Cheers, > Magnus > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
