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

Sun Feb 26 22:55:12 UTC 2012

Thanks, i will try the refresh. 
After it got so hot, on a hot summer , around 30 degrees, that I thought someting got fire, i opened it and it smelled burned. It was on top of a calibrator and two cm under a wooden shelf. The wood was very hot too. The part that produced the heat was the transformer. The metal case next to it also gets to hot to touch.  I measured (after opening the cabinet a transformer temperature around 58 degrees Celcius. ( if I remember wel)
It has now nothing on top of it, i put some heatransfer paste on the cabinet and mounted a heatsink om it, right above the transformer. The cabinet has a shape inside that touches the transformer like it has the function to cool the transformer. An other voltnut told me the tin next to the transformer was to hot to toutch in his 7061 too.
So I' m curious about yours. 

Oh, the heatproblem was before I had replaced the dead nicd ( only could get a nimh), i do not know the schmatic but I do not think a shorted nicad can draw exessive current, it's current  is probably low and resistor limmited. Now in winter it just gets hot, but stil to hot to my liking, altough the keithleys also get rather warm. 

I like the 2000 very much. I like the 196 because the big digits and the 2000 because of the functions. 

Fred PA4TIM

Op 26 feb. 2012 om 23:28 heeft FabioEb at quipo.it het volgende geschreven:

>> 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.
> 
> Fred, as I understand and imagine the process should be this
> (reading the 7061 manual):
> when you calibrate the particular range you are storing the info
> in ram, when you make refresh you store it in 2816 eeprom that
> is electrically reprogrammable.
> The battery is a nicad that I think is not suitable to store data
> for long time (self discharge, low reliability), for this usually
> instrument use lithium primary batteries.
> The firmware should be stored in the 2 27C256 eproms that are
> programmable (after cancellation under UV light) only in a
> suitable programmer, so firmware should be safe.
> The eeprom should not contain any important info, because I tried
> to start the meter without it and it just functions the same.
> Now my solartron is without battery, I tried to make a calibraiton
> to the 10V range, it mantained the data until powered, after
> it lose them and returned to default.
> When I'll have a backup I'll try to make a refresh command and see
> what happens.
> 
>> 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
> 
> What temperature does it reach?
> I can measure the temperature rise in it if this can help
> you.
> 
>> Besides a voltnut I'm a component measurement freak.
>> I have a whole arsenal of component testers, from ...
>> build the new one in this old housing ( it is from a
>> beautifull tek 1S1 sample plugin)
>> 
>> Fred PA4TIM
> 
> Wow that' called testing ! :)
> I read your blog when I searched info about solartron.
> I see also that you have a keithley 2000, what do
> you think about it?
> I'm searching one used for my lab, I would prefer the
> 2015 but the 2000 and 2700 all can be good for me.
> 
> Fabio.
> 
> P.S.
> I'm still trying to setup correctly the mail reply,
> sorry for the misplaced replys.
> 
> 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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