The multimeter uses the AC coupling method when measuring AC voltage.
The multimeter uses the AC coupling method when measuring AC voltage, which means that the DC component is isolated and not included in the measurement results. If you want to measure the true rms value of the AC+DC component, you need to measure the true rms value of the AC and DC components separately and then use the following formula to calculate ( SQRT[SQ(DCV)+SQ(ACV)] )
The advantage of making separate measurements of the AC and DC components is that the multimeter can measure them separately with the most accurate ranges. This can be beneficial when one component is significantly larger than the other.
