The circuit can't work with bridge rectifiers due to common ground connection.
The circuit can't work with bridge rectifiers due to common ground connection. You either need isolation transformers, or can use half-wave rectifiers with one diode per channel.
Too little information.
- Which kind of measurement is used by the reference voltmeter (Vrms, Vpeak, averaged rectified value)?
- Do you see constant mains voltage in the reference measurement and only variation of your ADC?
Did you get stable output when you measured any one of phase-neutral connection in post#1 ?when i measure any one of phase-neutral connection, the result of voltage is same as in external voltmeter
The circuit can't work with bridge rectifiers due to common ground connection. ..
The problem is that in the circuit of post#1 all three minus outputs of the three rectifers are connected... and this causes the problem...
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