[volt-nuts] volt-nuts Digest, Vol 8, Issue 2

Wed Apr 14 14:48:16 UTC 2010

Sent from my Banana Jr. mobile device

On Apr 14, 2010, at 5:32 AM, siebenborn <siebenborn at yahoo.de> wrote:

> 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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>>
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>>
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>> End of volt-nuts Digest, Vol 8, Issue 2
>> ***************************************
>>
>
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