[volt-nuts] Solartron 7081 NVM FAIL

[Fabio Eboli]

Hello, have you tried with monitor mode?
service manual pages 8.3 and up, you should
be able to get a raw value of constants
from nvm, maybe also more error details.
Strangely the manual states to not try to
recalibrate the zener and refer to solartron,
while the 7061 manual just explains how to do,
naturally the 7061 reference is simpler.

Fabio.

"David C. Partridge" <david.partridge at perdrix.co.uk> ha scritto:

> Bad news I think
>
> CALIBRATE,DUMP
> OK
> Vdc calibration constants
>  0.00000000E+00
>  167.776999E-03
>  0.00000000E+00
>  1.67776999E+00
>  0.00000000E+00
>  16.7776999E+00
>  0.00000000E+00
>  167.776999E+00
>  0.00000000E+00
>  1.67776999E+03
> Vac calibration constants
>  335.553999E-03
>  3.35553999E+00
>  33.5553999E+00
>  335.553999E+00
>  3.35553999E+03
> kOhm calibration constants
>  0.00000000E+00
>  167.776999E-03
>  0.00000000E+00
>  1.67776999E+00
>  0.00000000E+00
>  16.7776999E+00
>  0.00000000E+00
>  167.776999E+00
>  0.00000000E+00
>  1.67776999E+03
> Top Ohms range calibration constants
>  0.00000000E+00
>  12.0000000E+03
>  602.218329E-03
> Ratio terminals calibration constant
>  16.7776999E+00
> Zener current token value
> 255
> CALIBRATE,?
> E 7
> CALIBRATE ?
> OK
> Calibrate = Fail 1
> CALIBRATE,REFRESH
> OK
> Refresh fail        nvm page 1 & 2 are faulty
>
> D.
> -----Original Message-----
> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com]  
> On Behalf Of David C. Partridge
> Sent: 25 April 2012 14:50
> To: 'Discussion of precise voltage measurement'
> Subject: [volt-nuts] Solartron 7081 NVM FAIL
>
> The 74LS161 was the cuplrit, and the meter now starts up to display  
> the NVM FAIL message.   Substitution of the NVM from another meter  
> gave INITIALISED, so the problem is the ER-3400.
>
> I'm trying to work out whether the NVM FAIL message means just page  
> one of the calibration constants is gone and page two was OK, or  
> whether both pages are trashed?
>
> I can't remember - does the serial port use a "straight through"  
> connection - if so that would explain why it won't talk to me.
>
> If both pages are trashed, what hope to recalibrate the zener?
>
> Regards,
> David Partridge
>
>
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