[volt-nuts] volt-nuts Digest, Vol 80, Issue 14; Solratron cal issue

[Four Designs Company]

It has been some years since I last worked on a 7081, and I don't have 
the manuals at hand..
Is there a way to clear the EAROM contents and perhaps load starting cal 
constants? I think the EAROM data is corrupt or so far off that it 
cannot compute new values.

Bob

On 4/22/2016 9:00 AM, volt-nuts-request at febo.com wrote:
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> Today's Topics:
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>     1. Solartron 7081 calibration problems (David C. Partridge)
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>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 21 Apr 2016 20:52:30 +0100
> From: "David C. Partridge" <david.partridge at perdrix.co.uk>
> To: "'Discussion of precise voltage measurement'"
> 	<volt-nuts at febo.com>, <Solartron_Schlumberger_Equipment at groups.io>
> Subject: [volt-nuts] Solartron 7081 calibration problems
> Message-ID: <00c701d19c07$588e7410$09ab5c30$@perdrix.co.uk>
> Content-Type: text/plain;	charset="US-ASCII"
>
> I spent some of today attempting to calibrate a 7081 that has had the EAROM
> chip (ER3400) on the in-guard (floating) logic board replaced.
>
>   
>
> For each calibrate command issued I get a "Cal Incomplete" message rather
> than a "Cal OK" message (this *may* be OK, or *may* be a fault).
>
>   
>
> When I try to issue calibrate, reference, 10.00000 I get a message "Factor
> out of range" (all other VDC, VAC, and KOHM calibrate commands worked apart
> from the Cal Incomplete message).
>
>   
>
> Does anyone know what the problem is, or have any thoughts as to what the
> probable cause might be?
>
>   
>
> On a very related point, how do you calibrate the Ratio calibration constant
> (there's nothing in either the Service manual or the Test Specification
> about this other than item 21 in the automated  checks section on page 16
> which says:
>
>   
>
> 22. Ratio - ratio is calibrated.
>
>   
>
> Dave
>
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> End of volt-nuts Digest, Vol 80, Issue 14
> *****************************************
>