[time-nuts] HP 5370A

Robert Atkinson robert.atkinson at genetix.com
Mon Oct 16 03:28:27 EDT 2006

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

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


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