[volt-nuts] volt-nuts Digest, Vol 8, Issue 2
siebenborn
siebenborn at yahoo.de
Wed Apr 14 12:32:59 UTC 2010
Hi Rob,
thanks for your reply.
> Ah, but where does the gold connect to?
Sure, the gold connects to the alloy.
But if the WHOLE connector is plated with gold,
the connections are:
Frontside : gold-gold (e.g. if a gold banana plug is used)
Backside : gold-tin-copper (soldered copper wire)
Under this cirumstances, there is no connection to the alloy,
only to gold.
I admit that I never made practical measurements.
This is pure theory. But I think, it's worth to discuss
about it.
Regards
Marten
--- volt-nuts-request at febo.com <volt-nuts-request at febo.com> schrieb am Mi, 14.4.2010:
> Von: volt-nuts-request at febo.com <volt-nuts-request at febo.com>
> Betreff: volt-nuts Digest, Vol 8, Issue 2
> An: volt-nuts at febo.com
> Datum: Mittwoch, 14. April, 2010 14:00 Uhr
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> Today's Topics:
>
> 1. low emf binding post (siebenborn)
> 2. Re: low emf binding post (Rob Klein)
> 3. Re: low emf binding post (Alan
> Scrimgeour)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 13 Apr 2010 17:05:40 +0000 (GMT)
> From: siebenborn <siebenborn at yahoo.de>
> Subject: [volt-nuts] low emf binding post
> To: volt-nuts at febo.com
> Message-ID: <599672.47931.qm at web26604.mail.ukl.yahoo.com>
> Content-Type: text/plain; charset=iso-8859-1
>
> Hi,
>
> my name is Gerd and this is my first post to the group.
>
> I have a question to the experts:
>
> In an older thread, binding post's from POMONA, the 3770
> shall be
> the first choice, if low emf is required. These binding
> post are made
> of tellurium copper alloy, which make this low thermal emf
> possible.
> Do you aggree ?
>
> I'm not sure :
> The area which 'makes' the electrical connection is gold,
> not the
> the alloy. So why not use any other gold plated quality
> connector ?
>
> Thank you !
>
> Regards
>
> Gerd
>
>
>
>
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> ------------------------------
>
> Message: 2
> Date: Tue, 13 Apr 2010 22:14:43 +0200
> From: Rob Klein <rob.klein at smalldesign.nl>
> Subject: Re: [volt-nuts] low emf binding post
> To: Discussion of precise voltage measurement <volt-nuts at febo.com>
> Message-ID: <4BC4D0B3.9030904 at smalldesign.nl>
> Content-Type: text/plain; charset=ISO-8859-1;
> format=flowed
>
> Hi Gerd,
>
> siebenborn schreef:
> > The area which 'makes' the electrical connection is
> gold, not the
> > the alloy.
> Ah, but where does the gold connect to?
> > So why not use any other gold plated quality connector
> ?
> >
> Because most "other" gold plated connectors are made of
> brass, which has
> significantly
> higher thermal EMF against gold or copper.
>
>
> Rob.
>
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 14 Apr 2010 00:39:13 +0100
> From: "Alan Scrimgeour" <scrimgap at blueyonder.co.uk>
> Subject: Re: [volt-nuts] low emf binding post
> To: <siebenborn at yahoo.de>,
> "Discussion of precise voltage measurement"
> <volt-nuts at febo.com>
> Message-ID:
> <A552DA59CA86495F8319A37D2DFE89C1 at AlanPC>
> Content-Type: text/plain; format=flowed;
> charset="iso-8859-1";
> reply-type=original
>
> >From what I've read the best thing is to use no
> plating, but you need to
> make sure you don't get problems from copper oxide build up
> which has a very
> high thermal emf against copper.
> I think you're likely to puncture any thin oxide layer when
> making a
> connection, so I'm not sure this is really a problem in
> practice. An
> application of something like Deoxit would hopefully solve
> it anyway.
> With gold plating I presume the temperatures either side of
> the plating at
> the point of contact will so similar that very little emf
> will be generated
> independent of what plating material is used.
> Tables of thermal emf vs. copper show brass produces
> quite a low voltage.
> I've never seen the figure for tellurium copper quoted.
>
> Alan
>
>
> ----- Original Message -----
> From: "siebenborn" <siebenborn at yahoo.de>
> To: <volt-nuts at febo.com>
> Sent: Tuesday, April 13, 2010 6:05 PM
> Subject: [volt-nuts] low emf binding post
>
>
> Hi,
>
> my name is Gerd and this is my first post to the group.
>
> I have a question to the experts:
>
> In an older thread, binding post's from POMONA, the 3770
> shall be
> the first choice, if low emf is required. These binding
> post are made
> of tellurium copper alloy, which make this low thermal emf
> possible.
> Do you aggree ?
>
> I'm not sure :
> The area which 'makes' the electrical connection is gold,
> not the
> the alloy. So why not use any other gold plated quality
> connector ?
>
> Thank you !
>
> Regards
>
> Gerd
>
>
>
>
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> End of volt-nuts Digest, Vol 8, Issue 2
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