Volker, I came across a couple of old Fluke differential voltmeters that need some work. I thought it would be best to use low thermal EMF solder on these.
Joe Gray W5JG On Mon, Aug 12, 2013 at 10:39 AM, Volker Esper <[email protected]> wrote: > > Sorry, Joe, if my question was mistakable. I wanted to know your > application. Maybe I'd recommend not using a special solder alloy rather > than going the long way of aquiring it. > > I give you an example: When fixing a 6.5 digit DMM (HP34401A) I wasn't > sure if I might use a special alloy to solder the pins of an input relay. > In the end I did not. Comparing this fixed unit to a second one in several > automated 24 hours tests with varying room temperatures, there seem to be > no measurable differences between the two. So in this case it appears to be > of no great importance using a special solder. > > Enthough the thermoelectric voltages at these pins are not negligible and > therefore have to be considered, other effects obviously are of much more > effect. So, as I mentioned, using a special soldering alloy drops in the > priority list. > > Now, that I'm curious, please let us know, what you are using the solder > for. > > Volker > DF9PL > > > Am 12.08.2013 15:06, schrieb Joseph Gray: > >> As I asked in my original message, I'm trying to find out where I can buy >> a >> small quantity of rosin-core 10/90 (tin/lead) solder. I don't want to buy >> it in bar form from China. >> >> Joe Gray >> W5JG >> >> >> >> On Mon, Aug 12, 2013 at 3:17 AM, Volker Esper<[email protected]> wrote: >> >> >> >>> sorry, spelling mistake: >>> "What do you _want_ it for?" >>> >>> Remember, those solder alloys are optimized for a specific alloy >>> combination only, e.g. Cu-Cu. >>> >>> Volker >>> >>> >>> Am 12.08.2013 10:39, schrieb Volker Esper: >>> >>> >>> >>> >>>> Hi Joe, >>>> >>>> What are you looking for, Cadmium-Solder, or Sn10Pb90, which is >>>> Stannum/Plumbum-only? >>>> >>>> And what do you what it for? In (very high) precision applications there >>>> are so many issues to consider that the solder doesn't appear to be at a >>>> high priority... >>>> >>>> Volker >>>> >>>> >>>> Am 12.08.2013 00:38, schrieb Joseph Gray: >>>> >>>> >>>> >>>>> Reading through the archives, I saw that there was some discussion >>>>> about >>>>> a >>>>> safer alternative to cadmium-based solder. The low tin, high lead alloy >>>>> was >>>>> recommended as a good low-thermal EMF substitute. However, I did not >>>>> see >>>>> any recommendations on where to buy some of this. >>>>> >>>>> I just did some searching and all I come up with is bar solder, mostly >>>>> from >>>>> China. Where can I buy a small quantity of rosin-core 10/90 solder? >>>>> Mouser, >>>>> which is my preferred vendor certainly didn't list any. I would think >>>>> that >>>>> even 1/2 pound would last me a lifetime. >>>>> >>>>> Joe Gray >>>>> W5JG >>>>> ______________________________****_________________ >>>>> >>>>> volt-nuts mailing list -- [email protected] >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/****<https://www.febo.com/cgi-bin/**> >>>>> mailman/listinfo/volt-nuts<htt**ps://www.febo.com/cgi-bin/** >>>>> mailman/listinfo/volt-nuts<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/****<https://www.febo.com/cgi-bin/**> >>>> mailman/listinfo/volt-nuts<htt**ps://www.febo.com/cgi-bin/** >>>> mailman/listinfo/volt-nuts<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/****<https://www.febo.com/cgi-bin/**> >>> mailman/listinfo/volt-nuts<htt**ps://www.febo.com/cgi-bin/** >>> mailman/listinfo/volt-nuts<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<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<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.
