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Author Topic: Solartron 7061 wont store cal constants  (Read 858 times)

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Offline justanothernameTopic starter

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Solartron 7061 wont store cal constants
« on: May 24, 2021, 02:45:46 pm »
Hello Everyone!
I got a Solartron 7061 in a pretty good (optical) condition. Today I was able to calibrate it with a precision voltage source. Seems to be well within specs afterwards.
Only, when I powercycle the unit, it seems to loose calibration. Values are way off, just as before calibration. I already changed the internal battery, but as I understand, it is only for settings history, not for calibration constants.
I do use the refresh command, it gives me a DONE back. After power cycling, I can see the custom string I entered as "date", so I assume IC113 is at least partially good...
Anyone an idea whats happening here?
Thank you
M.
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Online Kosmic

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Re: Solartron 7061 wont store cal constants
« Reply #1 on: May 24, 2021, 10:24:40 pm »
Did you enter the refresh command ?

From the maintenance manual, page 2.22:

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Offline justanothernameTopic starter

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Re: Solartron 7061 wont store cal constants
« Reply #2 on: May 25, 2021, 04:44:23 am »
yes, I do. It takes some time, and says "DONE".
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Offline bdunham7

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Re: Solartron 7061 wont store cal constants
« Reply #3 on: May 25, 2021, 05:09:57 am »
Have you tried calibrating it and then NOT refreshing before a power cycle?
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A 3.5 digit 4.5 digit 5 digit 5.5 digit 6.5 digit 7.5 digit DMM is good enough for most people.
 

Offline justanothernameTopic starter

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Re: Solartron 7061 wont store cal constants
« Reply #4 on: May 25, 2021, 05:12:42 pm »
Quote from: bdunham7 on May 25, 2021, 05:09:57 am
Have you tried calibrating it and then NOT refreshing before a power cycle?

Yes right now. Did not work. The date string is stored though. I ordered two spare eeproms, maybe IC113 has some weird faulty bytes.
What puzzles me is that "REFRESH" should verify the eeprom contents and give me an error in case of a fault.
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