[volt-nuts] 3458A - To Modify or Not To Modify?

[J. L. Trantham]

Roy,

They are the same sockets that are used for the Opt 001 memory chips except
they have a gold plating at the contact points where the chip plugs in.  I
suspect that they are the same sockets used for the six EPROM variant of the
A5 board.  I have the single EPROM variant.  The data sheet is here:

http://www.te.com/catalog/pn/en/1825108-3

I like the idea of trying to make it look like it was original.  The gold
plating is an effort to avoid the '5370B' issue that Didier mentioned.  If I
get 30 years out of it, I'll be more than satisfied.

My only uncertainty is whether or not the 'cal' chip survived the effort.
The other two were full of data when I archived them.  The 'cal' chip was
only sparsely populated and no information that looked useful.  I'll have to
wait on the new sockets to arrive to find out.

Good luck on your effort.

Joe



-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of Roy Phillips
Sent: Monday, November 07, 2011 5:59 AM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify?




Joe
I have always understood that you should not mix gold and other dissimilar 
metals when it comes to electrical connections.  I think the devices 
concerned have "tinned" pins. Am I right ?
I am very interested in this matter of the 3458A as I have one which informs

me that one of the DS1230Y has a "failed" battery. So having had some very 
helpful advice from Poul-Henning, I currently run my 3458A "24/7" until I 
establish what to do, and what the cost will be here in the UK to carry out 
the up-grade!!
Roy

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