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

[Roy Phillips]

--------------------------------------------------
From: "J. L. Trantham" <jltran at att.net>
Sent: Sunday, November 06, 2011 11:13 PM
To: "'Discussion of precise voltage measurement'" <volt-nuts at febo.com>
Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify?

> I agree.
>
> However, if I am going 'all in' on damage to the board by placing sockets
> for the EPROM and the DS1220Y, why not go 'all the way' and also do the
> other DALLAS chips?
>
> Interestingly, I got four HM62256LP-10 chips off theBay, inserted them in
> U123-U126, and, miraculously, 'OPT 1,0' appeared.  I noted that the 
> sockets
> are plain 'AMP' closed frame sockets with just plain 'tin' (I think?)
> connectors.  I think I will use the same socket, but with Gold Plating, 
> for
> the EPROM and the DALLAS chips as opposed to the Mill-Max.
>
> Any thoughts?
>
> Joe
>
> -----Original Message-----
> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
> Behalf Of Poul-Henning Kamp
> Sent: Sunday, November 06, 2011 4:20 PM
> To: Discussion of precise voltage measurement
> Subject: Re: [volt-nuts] 3458A - To Modify or Not To Modify?
>
> In message <ABBBD83DE5B74F8885F0F686C7ACD9D3 at cardiac5f772ce>, "J. L.
> Trantham"
> writes:
>
>>Just to make sure I understand, since they are all DALLAS chips (two
>>DS1230Y-150 for 'program memory', and a DS1220Y-150 for 'cal memory'), 
>>with
>>their internal batteries, they all will die in the future and that 'memory
>>of programs' function will be lost.  So, therefore, it seems that they 
>>will
>>need to be replaced from time to time (mine are 14 years old) and since I
> am
>>going to need to remove them to replace them, why not place a socket?
>
> Because in all likelyhood you will not care for the functionality
> which the DS1230Y's deliver, so rather than risk another 56 pins
> to unsolder, you can just leave them in, with no (relevant) loss
> of functionality.
>
> -- 
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by 
> incompetence.
>
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> 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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