Comparison Euromet.EM-K8 of DC Voltage Ratio: Results
Twenty National Metrology Institutes have participated in the European DC voltage ratio key comparison (EUROMET.EM-K8). The results for the voltage ratios 1000V/10V and 100V/10V are reported
AN IMPROVEMENT OF DC VOLTAGE RATIO MEASURUREMENTS BY CHARACTERIZATION OF THE DC VOLTAGE DIVIDER AT UME Tezgül CO Ş KUN ÖZTÜRK
The accuracy of the DC voltage measurements higher than 10 V depends on the accura cy of DC voltage ratio measurements. Reference standards for DC voltage ratio measurements are resistive voltage di viders which are generally self calibrated by their own br idges. Calibration of a absolute voltage divider with wide ratio range, such a Datron 4902S, using its bridge is dif ficult and time consuming calibration. Three different methods for the calibration have been investigated in order to make simpler divider calibration without losing from uncertainty . An extensive set of measurements were performed on Dat ron 4902S and its ratio drift for one year has been det ermined as less than 0.3·10 -6 for all ratios from 20V:10V to 1000 V:10 V. The measurement results of Datron 4902S are pres ent d.
Behavior of the travelling standards in the international comparisons of DC voltage ratio
Two international comparisons of DC voltage ratio up to 1000 V have been started. Unexpected difficulties when directly comparing at high voltage the travelling divider with a reference divider were reported and investigated. From the control measurements at the pilot laboratory (IEN), information about the behavior of the travelling standards in the comparisons can be drawn.