Author Topic: Hameg HM8012 ''OFF"  (Read 1682 times)

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Offline giannisvTopic starter

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Hameg HM8012 ''OFF"
« on: April 04, 2022, 09:16:21 am »
Hello all,

I have been using HM8012 for several years but suddenly the OFF indicator appeared on the screen. Is there any opinion on this problem?
 

Offline F64098

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Re: Hameg HM8012 ''OFF"
« Reply #1 on: April 05, 2022, 12:59:08 am »
There seems to be a problem with the Cal-EEProm 93C46. Reject it and try to switch on.


Best regards

Frank
 

Offline giannisvTopic starter

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Re: Hameg HM8012 ''OFF"
« Reply #2 on: April 05, 2022, 01:52:18 pm »
Dear Frank,

Fisrt of all thank you for answer but the eeprom 93c46 in a socket it's easy to removed and appeared on display CAL E (calibration error), the problem remains.

Best Regards,
Giannis
 

Offline F64098

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Re: Hameg HM8012 ''OFF"
« Reply #3 on: April 05, 2022, 03:01:46 pm »
You can find the service manual here: https://sm5cbw.se/hameg/hm80/hm8012-serv.pdf
The display of 'OFF' is not mentioned in it and i never saw it on my 3 units.
So i have no further idea, what happened to your unit.

Best regards

Frank
 
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Offline giannisvTopic starter

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Re: Hameg HM8012 ''OFF"
« Reply #4 on: April 05, 2022, 03:11:07 pm »
Dear Frank,

You were absolutely right as soon as I replaced the eeprom 93c46 it works and you need calibration.

Thank you very much
Giannis
 

Offline holyholy

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Re: Hameg HM8012 ''OFF"
« Reply #5 on: April 09, 2023, 07:19:30 pm »
Hello to everybody. Thank you for this forum it has helped me a lot. I have a Hameg HM8012 which has problems. At first, after turning on and starting the procedure, it said OFF. Replacing the EEPROM as shown here solved everything. After powering up with the new EEPROM it showed CAL E and the display showed nonsense values. I tried to load the data from the original EEPROM and it worked. So I uploaded them to the new memory and turned on the device. The display showed CAL E again, but the multimeter went into measurement mode, the ranging relays clicked, but the instrument behaved strangely and measured the wrong readings. I suspect that the data in the old EEPROM is corrupted. Could one of you email me the .bin file from your multimeter? I would try uploading it to mine to verify the function even at the cost of inaccurate measurement.
Thank you for any new advice. Richard.
 

Offline kripton2035

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Re: Hameg HM8012 ''OFF"
« Reply #6 on: April 09, 2023, 08:29:56 pm »
so... it seems a good thing to open your 8012 and save the eeprom content for the time where the eeprom dies ?
 

Offline holyholy

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Re: Hameg HM8012 ''OFF"
« Reply #7 on: April 09, 2023, 08:33:10 pm »
It would probably be good. I would need statement 93C46
 

Offline kripton2035

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Re: Hameg HM8012 ''OFF"
« Reply #8 on: April 10, 2023, 06:53:01 am »
I don't think the eeprom content of another 8012 will be good for your 8012, as the calibration sure is different.
 

Offline holyholy

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Re: Hameg HM8012 ''OFF"
« Reply #9 on: April 10, 2023, 03:20:06 pm »
Yes, I know that other calibration values will not be suitable for my 8012, but I will verify that the device is fine (even if it will measure inaccurately) and then I can have it calibrated in an accredited laboratory.
 


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