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| Aneng Q1 Multimeter Adjust\Calibrate |
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| alaaj99:
Hello 👋 Is there a way to Adjust\Calibrate Aneng Q1 Multimeter. Short story, I got the Multimeter and noticed it's a "Battery hungry" so I replaced the normal AA batteries with 3.7 lithium-ion. During the process I "accidently" ripped off the traces of positive and negative of the AA battery holder. After resoldering the traces, the Multimeter started showing Inaccurate measurements, here are a few examples: Measuring AC 238V, It's actually 230V Measuring DC 4V, It's actually 3.9V Measuring Ohm 5.86K, It's actually 5.65k. Measuring Temp starts at 45C/113F. and so on. The Multimeter doesn't have a potentiometer inside it. There's a component inside labeled ICL8069, I think it's called TVS, it should be 1.2V voltage reference, but it's measuring 1.236V Yes, I replaced the leads. No, the Multimeter doesn't get any voltage above 3.6V from the lithium-ion battery. Any help is appreciated. Full review for Q1 Multimeter from eevblog YT channel: |
| Phil1977:
Calibration is stored in the EEPROM by the manufacturer. Many dirt-cheap DMMs have no way to access the calibration. Are you sure it´s out of calibration? Can you compare to any other DMM? The numbers you´ve told, especially about mains voltage, may absolutely be in their tolerance range. |
| Fungus:
If you're 100% sure it got worse then check for flux contamination, etc., on the PCB. Give it all a good clean with isopropyl alcohol... |
| Atlan:
Does the stabilizer have blocking capacitors? It doesn't oscillate. |
| alaaj99:
--- Quote from: Phil1977 on June 23, 2024, 09:16:35 am ---Calibration is stored in the EEPROM by the manufacturer. Many dirt-cheap DMMs have no way to access the calibration. --- End quote --- Are you saying That the Calibration is done by the EEPROM? Because I DID reprogram it using a file found online for the same DMM but "Under a different brand". --- Quote from: Phil1977 on June 23, 2024, 09:16:35 am ---Are you sure it´s out of calibration? Can you compare to any other DMM? The numbers you´ve told, especially about mains voltage, may absolutely be in their tolerance range. --- End quote --- Yes, I did compare it with a couple of other DMMs. Only mine shows a big difference. |
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