> Hi, Fabio! > I'm think answer is on the page 8.3 of the 7061 Operating Manual. > Besides, 7071 manual says, that "Refresh" command must be executed to ensure > EEPROM proper operation. > > Mickle T. > Hello, Mickle I reread the manual, but I'm not sure to understand it correctly, it seem to me that Refresh command writes the actual Calibration constants to EEPROM. I haven't tried yet to recalibrate it. Now I'm curious if this eeprom is corrupted. Since now I don't have all the necessary to calibrate it I don't want to try yet. Fabio. ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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.

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@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. > > > > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.