[volt-nuts] Solartron 7061 help request (eeprom?)

[Fred Schneider]

I also do not understand the refresh. Still not after this text, but that is because I do know nothing about digital stuff. I was thinking it as a sort of reset to factory calibration. But it writes the RAM to a EEPROM. Does that mean that the battery not hold the calibration I do in RAM when it is switched of for a while ? That would explain some problems. 
Or is it just in case the battery gets empty or  is replaced ? 
I did not dare to try it because I was afraid that I removed firmware or other things so my meter will not function.

I heard from other 7061 users it can get very hot. The current draw is within specs. Without manual I do not know the allowed ripple or where to measure witch voltage, so I meaured on the filter caps for ripple and that did not look strange. To be sure I checke the caps and they were OK 

Besides a voltnut I'm a component measurement freak. I have a whole arsenal of component testers, from Curvetracer, via LCR meters ( commercial and home build)  to VNAs.
I measure capacitance down to fF, resistors up to petaOhms, coils down to nHs. Measure parasitics from components just for fun. If I fix a meaurement instrument (and i do that a lot) i alway examine the bad parts. So if I find a bad electrolyte or cap, i replace it but keep the bad one apart for measurement. I check ESR, soakage, capacitance, DC leakage, sometimes frequency behaviour and if it is strange enough I take it apart. http://www.pa4tim.nl/?p=1385. This one i used in a story about cap testing. It was reduced to a few pF. Inside the electrode was rotten away. And I was crazy enough to build the new one in this old housing ( it is from a  beautifull tek 1S1 sample plugin)

Fred PA4TIM

Op 26 feb. 2012 om 17:15 heeft Михаил <timka2k at yandex.ru> (Mickle) het volgende geschreven:

> REFRESH command description from the 7071 manual:
> 
> 8.3.2 CALIBRATE, REFRESH
> This command enables a refresh of the NVM, i.e. the present calibration
> constants are written back into the NVM. The sequence of operation is as
> follows:
> *   Microprocessor checks both pages of the NVM.
> *   First correct page is down-loaded to the RAM.
> *   Microprocessor checks the RAM
> *   RAM contents are written into both pages of the NVM.
> *   Microprocessor checks both pages of the NVM.
> ...
> *   One of the following messages will appear:
> REFRESH COMPLETE   - refresh has been successful and no faults have
> been found.
> REFRESH COMPLETE NVM PAGE 1 WAS FAULTY
> - refresh has been successful. Page 1 of the NVM was originally faulty but is now correct.
> REFRESH COMPLETE NVM PAGE 2 WAS FAULTY
> - refresh has been successful. Page 2 of the NVM was originally faulty but is now correct.
> REFRESH FAIL RAM COPY FAIL
> - refresh has been unsuccessful as the RAM copy is faulty.
> REFRESH FAIL NVM PAGE 1 IS FAULTY
> - refresh has been unsuccessful. Page 1 of the NVM is faulty.
> REFRESH FAIL NVM PAGE 2 IS FAULTY
> - refresh has been unsuccessful. Page 2 of the NVM is faulty.
> REFRESH FAIL NVM PAGE 1 & 2 ARE FAULTY
> - refresh has been unsuccessful. Both pages of the NVM are faulty.
> 
> I think 7061 have the same algorithm.
> 
> Mickle T.
> 
> Fqi> Hello, Mickle
> Fqi> I reread the manual, but I'm not sure to understand it correctly,
> Fqi> it seem to me that Refresh command writes the actual Calibration
> Fqi> constants to EEPROM. I haven't tried yet to recalibrate it.
> Fqi> Now I'm curious if this eeprom is corrupted.
> Fqi> Since now I don't have all the necessary to calibrate it I don't
> Fqi> want to try yet.
> 
> Fqi> Fabio.
> 
> 
> 
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