Abstract
Since 1987, electrical laboratory of SNSU was built a traceability capability of DC voltage unit from PJVS up to two Multifunction Calibrator instruments. Therefore, the dissemination accuracy was performed gradually from PJVS to two multifunctions calibrator through a standard cell instrument. The two units of multifunction calibrators instruments are used as working standards instrument and should be maintained its traceability. One of the multifunction calibrator (MCS) instrument that is traceable to the standard cell instrument will be disseminated it accuracy to the other multifunction calibrator (MCU) instrument was done in these research. A potentiometer principle was basically used as a subtractor system that subtract the MCS value from the MCU value. Uncertainty analysis is carried out in this paper to validate the characteristics of the method against the NULL method based on the error number (En) reaching -0.1
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