[time-nuts] HP 5370A

[Dr Bruce Griffiths]

Robert Atkinson wrote:
> Hi Chuck,
> I'd agree on the use of connector wipes, but doubt that they have
> silicone as a lubricant. Silicone oil or grease is not generally
> suitable as a lubricant on electrical contacts as it can form an
> insulating layer that is virtually impossible to remove. This is
> especially true of contacts that may arc, even slightly. Many years ago
> when the UK telephone system was still electromechanical they had a
> sudden spate of contact failures. These only occurred close to the floor
> and the cause was traced to a change in the floor polish to a silicone
> formulation.
>
> Robert G8RPI.
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Chuck Harris
> Sent: 15 October 2006 16:15
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 5370A
>
> Didier Juges wrote:
>
>   
>> PS: The card edge connectors on this unit are extremely tight. I 
>> "easily" broke one of the extractor on the CPU card, and the ROM card 
>>     
>
>
> I am very careful to remove boards like this, I don't like to break the
> extractors.  Once I get them removed, I give the card edge a wipe with
> one of those "gold saver" wipes made by Chemtronics and others.  It adds
> a little touch of a silicone lubricant to the fingers and reduces the
> insertion force by about 5x.  Plus, it cleans the gorp off of the gold
> fingers.
>
> -Chuck
>
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>   
According to the Material safety datasheet, Chemtronics Goldguard 
consists of 94-99% n propyl alcohol plus 0.1-1% polyphenyl ether.

Bruce