I'm looking to make some test leads suitable for measuring voltage standards (1 to 10V) and resistance standards (1 - 100k ohm). My thought was to terminate the ends of the leads with spade lugs suitable for use on standard binding posrs, but I am having trouble locating a source. I'd prefer copper or gold-plated copper suitable for crimping to 18 to 20 gauge wire. Most of what I've found has been targeted toward the audiophiles for terminating 8 to 12 gauge (or larger) speaker wire. I've tried using these before, and crimping them seems to require super-human strength or an industrial-sized crimping tool that I'm not interested in purchasing. Any pointers? Or recommendations other than spade lugs? Thanks. Randy.

Pomona or Keithley. Pomona sells very high grade ones, but they are expensive. Keithley sold bare Cu lugs for low-thermal connections. I'd start there. Another option would be an electrical supply house, then chemically strip the plating. -John ============== > I'm looking to make some test leads suitable for measuring voltage > standards (1 to 10V) and resistance standards (1 - 100k ohm). My thought > was to terminate the ends of the leads with spade lugs suitable for use on > standard binding posrs, but I am having trouble locating a source. I'd > prefer copper or gold-plated copper suitable for crimping to 18 to 20 > gauge wire. > > Most of what I've found has been targeted toward the audiophiles for > terminating 8 to 12 gauge (or larger) speaker wire. I've tried using > these before, and crimping them seems to require super-human strength or > an industrial-sized crimping tool that I'm not interested in purchasing. > > Any pointers? Or recommendations other than spade lugs? > > Thanks. > > Randy. > > > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > >

Op 4-9-2010 23:48, J. Forster schreef: > Another option would be an electrical supply house, then chemically strip > the plating. > > -John > > ============== In an exchange of PM's, fellow Volt-Nut Alan Scrimgeour showed me how he had successfully done just that. As far as I've looked, almost all commercially available crimp terminals are tin plated pure copper, although there are a few brass ones about too. - Rob

Yes, I tried a mix for chemically stripping tin and lead from copper. I think it also removed the inter-metallic layer between them, which is important, judging by the bright copper colour, but that's a guess. I can't find the details now, but if you Google enough you'll probably find the details at a site specialising in advising members of the metal plating industry. I think it was a mixture of water, copper sulphate and sulphuric acid (which I had to hand) and used at about 80C. There were some other formulations but they sounded more complex or expensive and commercial products are available if cost is no object. I haven't checked the result for thermally generated voltage against the same lugs with the plating thoroughly sanded off, but they looked the right colour. Alan ----- Original Message ----- From: "Rob Klein" <rob.klein@smalldesign.nl> To: "Discussion of precise voltage measurement" <volt-nuts@febo.com> Sent: Saturday, September 11, 2010 2:23 PM Subject: Re: [volt-nuts] Source for spade lugs? > Op 4-9-2010 23:48, J. Forster schreef: >> Another option would be an electrical supply house, then chemically strip >> the plating. >> >> -John >> >> ============== > In an exchange of PM's, fellow Volt-Nut Alan Scrimgeour showed me how he > had successfully > done just that. As far as I've looked, almost all commercially available > crimp terminals are > tin plated pure copper, although there are a few brass ones about too. > > > - Rob > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.

Just found this: http://www.finishing.com/319/63.shtml -Rob Op 11-9-2010 17:20, Alan Scrimgeour schreef: > Yes, I tried a mix for chemically stripping tin and lead from copper. > I think it also removed the inter-metallic layer between them, which > is important, judging by the bright copper colour, but that's a guess. > I can't find the details now, but if you Google enough you'll probably > find the details at a site specialising in advising members of the > metal plating industry. I think it was a mixture of water, copper > sulphate and sulphuric acid (which I had to hand) and used at about > 80C. There were some other formulations but they sounded more complex > or expensive and commercial products are available if cost is no > object. I haven't checked the result for thermally generated voltage > against the same lugs with the plating thoroughly sanded off, but they > looked the right colour. > > Alan > > > > ----- Original Message ----- From: "Rob Klein" <rob.klein@smalldesign.nl> > To: "Discussion of precise voltage measurement" <volt-nuts@febo.com> > Sent: Saturday, September 11, 2010 2:23 PM > Subject: Re: [volt-nuts] Source for spade lugs? > > >> Op 4-9-2010 23:48, J. Forster schreef: >>> Another option would be an electrical supply house, then chemically >>> strip >>> the plating. >>> >>> -John >>> >>> ============== >> In an exchange of PM's, fellow Volt-Nut Alan Scrimgeour showed me how >> he had successfully >> done just that. As far as I've looked, almost all commercially >> available crimp terminals are >> tin plated pure copper, although there are a few brass ones about too. >> >> >> - Rob >> >> _______________________________________________ >> volt-nuts mailing list -- volt-nuts@febo.com >> 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@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > -- Small Design Zuiddijk 354 1505 HD Zaandam The Netherlands tel. +31 (0)75 77 11 740 fax. +31 (0)75 77 11 742 e-mail: rob.klein@smalldesign.nl

"25% sulfuric acid plus 8 oz./gal copper sulfate," sounds like the one I used, but my memory is it has to be hot too. Alan ----- Original Message ----- From: "Rob Klein" <rob.klein@smalldesign.nl> To: "Discussion of precise voltage measurement" <volt-nuts@febo.com> Sent: Saturday, September 11, 2010 8:08 PM Subject: Re: [volt-nuts] Source for spade lugs? > Just found this: > http://www.finishing.com/319/63.shtml > > > -Rob > > Op 11-9-2010 17:20, Alan Scrimgeour schreef: >> Yes, I tried a mix for chemically stripping tin and lead from copper. I >> think it also removed the inter-metallic layer between them, which is >> important, judging by the bright copper colour, but that's a guess. I >> can't find the details now, but if you Google enough you'll probably find >> the details at a site specialising in advising members of the metal >> plating industry. I think it was a mixture of water, copper sulphate and >> sulphuric acid (which I had to hand) and used at about 80C. There were >> some other formulations but they sounded more complex or expensive and >> commercial products are available if cost is no object. I haven't checked >> the result for thermally generated voltage against the same lugs with the >> plating thoroughly sanded off, but they looked the right colour. >> >> Alan >> >> >> >> ----- Original Message ----- From: "Rob Klein" <rob.klein@smalldesign.nl> >> To: "Discussion of precise voltage measurement" <volt-nuts@febo.com> >> Sent: Saturday, September 11, 2010 2:23 PM >> Subject: Re: [volt-nuts] Source for spade lugs? >> >> >>> Op 4-9-2010 23:48, J. Forster schreef: >>>> Another option would be an electrical supply house, then chemically >>>> strip >>>> the plating. >>>> >>>> -John >>>> >>>> ============== >>> In an exchange of PM's, fellow Volt-Nut Alan Scrimgeour showed me how he >>> had successfully >>> done just that. As far as I've looked, almost all commercially available >>> crimp terminals are >>> tin plated pure copper, although there are a few brass ones about too. >>> >>> >>> - Rob >>> >>> _______________________________________________ >>> volt-nuts mailing list -- volt-nuts@febo.com >>> 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@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >> and follow the instructions there. >> > > -- > > Small Design > Zuiddijk 354 > 1505 HD Zaandam > The Netherlands > > tel. +31 (0)75 77 11 740 > fax. +31 (0)75 77 11 742 > e-mail: rob.klein@smalldesign.nl > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.