[volt-nuts] Solartron 7081 NVM FAIL

[David C. Partridge]

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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