In normal operating conditions the error correction is usually conducted shifting the transformation function of DC voltage calibrators by introducing a corrective quantity equal in value and opposite in sign to additive error. This additive error correction is performed in manual and automatic modes. Additive errors of DC voltage calibrators are mainly caused by zero bias of the transformation function of analog electronic components in electronic circuit and voltage drop in communication lines between different circuit nodes.
A method of additive error correction in DC voltage calibrator on the basis of inverting commutation method with additional voltage source is proposed. The structural diagram of the calibrator with automatic correction of additive errors is developed. The investigation of proposed diagram using computer simulation is conducted.