Products > Test Equipment

Aneng Q1 Multimeter Adjust\Calibrate

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alaaj99:

--- Quote from: Fungus on June 23, 2024, 12:07:13 pm ---
--- Quote from: alaaj99 on June 23, 2024, 11:33:24 am ---Are you saying That the Calibration is done by the EEPROM?

--- End quote ---

Yes.

--- End quote ---

Thank you very much, It was actually the EEPROM.
Luckily I did a backup of the EEPROM of my meter before flashing the one I found online.
Now after I restore it, everything is working great  :-+

alaaj99:

--- Quote from: Gyro on June 23, 2024, 01:36:20 pm ---Is it still possible to restore the meter to original state? You mentioned the solder pads but I don't know how well the cell is fixed down (I can see that it has a metal foil outer though). The Nokia cell's 700mAh remaining capacity is very poor when you compare it to easily available and cheap to buy 2500mAh NiMH low self-discharge rechargeable AA cells (Lidl for instance).

You might find that without the cell there, the calibration returns to normal. 1.236V is normal for an ICL8069 - the Renesas datasheet shows 1.2V min, 1.23V typ. and 1.25V max, so it is well within spec. it's not a close initial tolerance part.

Restoring a reasonable level of safety would certainly be desirable and I would hate to see you trash the meter with a failed EEPROM adjustment attempt.

--- End quote ---

Thank you.
All the points you referred to, specially about safety, will be considered.
The meter is working fine now, after restoring the original EEPROM file. It was the problem.
I'm replacing the Lithium battery with Ni-Mh batteries as you suggested.

Gyro:

--- Quote from: alaaj99 on June 24, 2024, 12:28:32 pm ---...
The meter is working fine now, after restoring the original EEPROM file. It was the problem.
...

--- End quote ---

Good save. :-+

alaaj99:
The problem is now SOLVED. Thanks everyone.
The wrong, not so accurate readings, was because I flashed the EEPROM of my meter with a random .bin file found online for the same meter BUT UNDER A DIFFERENT BRAND.
I searched online and found that this meter is sold from different brands and models:
Aneng Q1
Mustool Q1
Zoyi ZT x
Richmeters 409B ...... and maybe there's more
I compared two EEPROM files found online from different brands with the one I have and found they're not the same.
Anyway for anyone having the same problem, my meter is (Mustool Q1 9999) and here's a link for the EEPROM .bin file:

https://mega.nz/file/qt4gVBCB#8KeiUPCWBYPU04yP0JJTDTrvfw8L_JxT5Js1C2mdtgw

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