Bob Albert <bob91343@...> writes: > > I don't think it makes a lot of difference. I have some meters that are as old as I am and they still work > fine. If there is a problem, it's probably due to poor materials and being careful isn't going to save > much life. > > In fact, the plugs have springs that also can fatigue. Often what seems like a jack problem is really a plug > problem, and a new plug may fix it. > > And finally, there are other things in these units that limit life as well, and there isn't a whole lot you can > do about it. I recently had to replace the copper oxide rectifier in my Simpson 260 in order to get the AC > ranges working properly again. And there is the question whether the switches should be exercised > periodically to remove oxide, or if that causes too much wear. > > Bob > > On Saturday, August 16, 2014 8:33 AM, "Marv <at> Home" <marvin.gozum <at> comcast.net> wrote: > > I have some >30+ year old devices still in operation and over time, > dirt and less so, oxidation of the contact surfaces, are more > problems than the integrity of the jack's connection by > friction. Manufacturers and counterfeiter can make very poor jacks, > but the good ones have been trouble free. > > When specified, the spec sheet entry for jack 'wear' is called > "mating durability cycles" or variations in those words. The typical > brand name banana jack is rated to > 10,000 mating cycles, i.e, > connect-disconnect. Thus, is would imply the less you un/mate it, > the longer it last. > > At 06:37 AM 8/16/2014, Andrea Baldoni wrote: > >Hello! > > > >When the multimeter is not in use for some time (say, a day), do you > >think it's > >better to leave the banana plugs inserted, or to take them out? > >There is a certain wear in plugging and unplugging, but letting > >always in could > >enlarge the input jacks as well. > > > >Best regards, > >Andrea Baldoni
I am wondering Bob, where you got the replacement for the copper oxide rectifier. I have a bad one too and it seems it be obsolete. Did you use two germanium diodes and trim pots instead? I have read about this but not sure exactly how it is done. thanks. JHummel73 > >_______________________________________________ > >volt-nuts mailing list -- volt-nuts@... > >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt- nuts > >and follow the instructions there. > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@... > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt- nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
