[time-nuts] HP 5370B low frequency modulation
didier at cox.net
Mon Jul 23 22:12:39 EDT 2007
Thanks Bruce for the quick response, as always.
In my business, we typically dissolve the gold by dipping the solder cup in
a hot tin pot, which is replaced regularly, before soldering the wires. This
has been blessed by the major defense contractors for military applications.
Failure to do this typically results in weakening solder joints over time,
and delayed failures, particularly when there is mechanical and/or thermal
stress applied to the joint.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Dr Bruce Griffiths
Sent: Monday, July 23, 2007 9:29 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5370B low frequency modulation
Brooke Clarke wrote:
> ); SAEximRunCond expanded to false
time-nuts-bounces+bruce.griffiths=xtra.co.nz+bruce.griffiths=xtra.co.nz at febo
> Hi Didier:
> Would you elaborate on the comment "Gold plated connectors are a well
> example." Do you mean when soldered with Lead Tin solder instead of a
> bearing solder or something else?
> Have Fun,
> Brooke Clarke
> Didier Juges wrote:
>> ); SAEximRunCond expanded to false
time-nuts-bounces+brooke=pacific.net+brooke=pacific.net at febo.com
>> I have seen cold solder joints on thermal fuses and certain types of
>> capacitors, while the rest of the instrument was fine with no sign of
>> I think it has to do with the metal used for certain component leads.
>> they were never soldered well, or interface corrosion developed over
>> Gold plated connectors are a well known example.
>> Didier KO4BB
Gold dissolves in the solder and a gold -tin intermetallic compound is
formed which severely reduces the joint integrity and ductility.
This can be circumvented by keeping the gold concentration in the solder
below 4%. Tin plating over the gold before soldering is sometimes used
to ensure this.
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