Automatiskt Kalibreringssystem foer 10 VDC (Automated Calibration System for 10 VDC)

摘要

An automated calibration system for 10 VDC has been developed. The core of the system is a stable voltage divider, driven by a voltage source at 10.185 V. The divider is constructed so that each partial voltage can be determined by comparing with a well known Weston cell. By summing partial voltages, an accurate voltage of 10 V is realized. The voltage is used to calibrate voltage references at the 10 V level. The measuring process is controlled by a computer. Provided that a DVM with no disturbance on the system is used, an accuracy of 0.3 ppm is obtained. The main part of the uncertainty originates from the Weston cell. The system will, due to its higher accuracy and its easy handling, replace the existing manual method to calibrate 10 V at the Swedish National Testing and Research Institute.