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100V 10A DSN-VC288 DC Voltmeter Ammeter Review – calibration problems

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Kiriakos GR:

--- Quote from: aidept on August 18, 2021, 05:54:33 AM ---You right.
But with this piece of sh** amp/voltmeter I've been learning a lot. Because is faulted and forced me to find the schematic, to try to understand what is wrong, why errors and so on.

--- End quote ---

The major problem of STM85103F3 Chinese chip, this is that you are not aware which part will fail first of it.
Even today the Chinese factories are incapable to do proper chip encapsulation, and air bubbles are killing the chip.
Usually it fails at amp section.

The schematic this is not factory made, its a crude description of surrounded passive components.

Car electricians they are well aware of analog ammeter with center of 0 Ampere, this having positive and negative scale.
     

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