Solder is a no-no for the shorting link. Bad thermal EMF karma. You need to use pure copper.

I have a small amount of SnCd low thermal solder from a very old RF power meter. Dave -----Original Message----- From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of Mark Sims Sent: 09 April 2012 18:20 To: volt-nuts@febo.com Subject: [volt-nuts] Shorting links Solder is a no-no for the shorting link. Bad thermal EMF karma. You need to use pure copper. _______________________________________________ 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.

When I faced this, my thought was to get probably 22 ga copper wire and wrap it around the 'pins' on the connection side of the connector a number of times, connecting all the pins, then solder it all together just to 'hold' the wire in contact with the pins. Low thermal solder would be even better. Joe -----Original Message----- From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of David C. Partridge Sent: Monday, April 09, 2012 4:04 PM To: 'Discussion of precise voltage measurement' Subject: Re: [volt-nuts] Shorting links I have a small amount of SnCd low thermal solder from a very old RF power meter. Dave -----Original Message----- From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of Mark Sims Sent: 09 April 2012 18:20 To: volt-nuts@febo.com Subject: [volt-nuts] Shorting links Solder is a no-no for the shorting link. Bad thermal EMF karma. You need to use pure copper. _______________________________________________ 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.

On 4/9/2012 1:19 PM, Mark Sims wrote: > > Solder is a no-no for the shorting link. Bad thermal EMF karma. You need to use pure copper. You must cast or machine it out of solid silver.

In message <4F843D38.1010103@flatsurface.com>, Mike S writes: >> Solder is a no-no for the shorting link. Bad thermal EMF karma. ? As long as you maintain symmetry with respect to materials, it should cancel out ? -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.

Hi, Another thing to do is to use a close fitting top-hat made from a cube of foam polystyrene on the front covering right back to the front panel, and a bit of polystyrene behind if possible, you might even get below a millidegree of gradient in the plug. Also there was a person on this mailing list a while ago who made some low thermal emf solder, perhaps he could chime in on how difficult is was to make? MK > From: jltran@att.net > To: volt-nuts@febo.com > Date: Mon, 9 Apr 2012 16:57:16 -0500 > Subject: Re: [volt-nuts] Shorting links > > When I faced this, my thought was to get probably 22 ga copper wire and wrap > it around the 'pins' on the connection side of the connector a number of > times, connecting all the pins, then solder it all together just to 'hold' > the wire in contact with the pins. Low thermal solder would be even better. > > Joe > > -----Original Message----- > From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On > Behalf Of David C. Partridge > Sent: Monday, April 09, 2012 4:04 PM > To: 'Discussion of precise voltage measurement' > Subject: Re: [volt-nuts] Shorting links > > I have a small amount of SnCd low thermal solder from a very old RF power > meter. > > Dave > -----Original Message----- > From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On > Behalf Of Mark Sims > Sent: 09 April 2012 18:20 > To: volt-nuts@febo.com > Subject: [volt-nuts] Shorting links > > > Solder is a no-no for the shorting link. Bad thermal EMF karma. You need > to use pure copper. > > >

Back to the original question - to connect the guard or not? Currently I have it connected - using five short lengths of 1mm square copper twisted together and soldered to the contacts in the plug and soldered together using low thermal solder. The end of the connector is closed off to limit thermal disturbance. Dave -----Original Message----- From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of m k Sent: 10 April 2012 22:40 To: volt-nuts@febo.com Subject: Re: [volt-nuts] Shorting links Hi, Another thing to do is to use a close fitting top-hat made from a cube of foam polystyrene on the front covering right back to the front panel, and a bit of polystyrene behind if possible, you might even get below a millidegree of gradient in the plug. Also there was a person on this mailing list a while ago who made some low thermal emf solder, perhaps he could chime in on how difficult is was to make? MK > From: jltran@att.net > To: volt-nuts@febo.com > Date: Mon, 9 Apr 2012 16:57:16 -0500 > Subject: Re: [volt-nuts] Shorting links > > When I faced this, my thought was to get probably 22 ga copper wire > and wrap it around the 'pins' on the connection side of the connector > a number of times, connecting all the pins, then solder it all together just to 'hold' > the wire in contact with the pins. Low thermal solder would be even better. > > Joe > > -----Original Message----- > From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] > On Behalf Of David C. Partridge > Sent: Monday, April 09, 2012 4:04 PM > To: 'Discussion of precise voltage measurement' > Subject: Re: [volt-nuts] Shorting links > > I have a small amount of SnCd low thermal solder from a very old RF > power meter. > > Dave > -----Original Message----- > From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] > On Behalf Of Mark Sims > Sent: 09 April 2012 18:20 > To: volt-nuts@febo.com > Subject: [volt-nuts] Shorting links > > > Solder is a no-no for the shorting link. Bad thermal EMF karma. You > need to use pure copper. > > > _______________________________________________ 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.

Hi Dave, The guard is a driven mode, not expected to be connected directly to the measurement circuit, my vote is to leave it disconnected. Regards, MK > From: david.partridge@perdrix.co.uk > To: volt-nuts@febo.com > Date: Wed, 11 Apr 2012 11:33:06 +0100 > Subject: Re: [volt-nuts] Shorting links > > Back to the original question - to connect the guard or not? Currently I have it connected - using five short lengths of 1mm square copper twisted together and soldered to the contacts in the plug and soldered together using low thermal solder. The end of the connector is closed off to limit thermal disturbance. > > Dave > -----Original Message----- > From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] On Behalf Of m k > Sent: 10 April 2012 22:40 > To: volt-nuts@febo.com > Subject: Re: [volt-nuts] Shorting links > > > Hi, > > Another thing to do is to use a close fitting top-hat made from a cube of foam polystyrene on the front covering right back to the front panel, and a bit of polystyrene behind if possible, you might even get below a millidegree of gradient in the plug. > > Also there was a person on this mailing list a while ago who made some low thermal emf solder, perhaps he could chime in on how difficult is was to make? > > MK > > > From: jltran@att.net > > To: volt-nuts@febo.com > > Date: Mon, 9 Apr 2012 16:57:16 -0500 > > Subject: Re: [volt-nuts] Shorting links > > > > When I faced this, my thought was to get probably 22 ga copper wire > > and wrap it around the 'pins' on the connection side of the connector > > a number of times, connecting all the pins, then solder it all together just to 'hold' > > the wire in contact with the pins. Low thermal solder would be even better. > > > > Joe > > > > -----Original Message----- > > From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] > > On Behalf Of David C. Partridge > > Sent: Monday, April 09, 2012 4:04 PM > > To: 'Discussion of precise voltage measurement' > > Subject: Re: [volt-nuts] Shorting links > > > > I have a small amount of SnCd low thermal solder from a very old RF > > power meter. > > > > Dave > > -----Original Message----- > > From: volt-nuts-bounces@febo.com [mailto:volt-nuts-bounces@febo.com] > > On Behalf Of Mark Sims > > Sent: 09 April 2012 18:20 > > To: volt-nuts@febo.com > > Subject: [volt-nuts] Shorting links > > > > > > Solder is a no-no for the shorting link. Bad thermal EMF karma. You > > need to use pure copper. > > >