Monitoring of AH-11A fused-silica drift in RCM-LIPI and its implementation

We have been monitoring our standard capacitors of AH-1100 fused-silica drift for 8 years to maintain and obtain the actual values of them. One of the advantages of the standard capacitors is to be used as a reference standard for ensuring the performance of an AC high voltage capacitive divider, that is commonly used to assess a voltage level on a power distribution from plants to end-users. This paper describes the monitoring of AH-1100 and its validation performed by comparing to the calibration results of KRISS, the national metrology institute of The Republic of Korea. The AH-1100 drifts is found to be less than 0.0052μF/F/year, and the comparison results show a good agreement, making the monitoring results have been validated. Moreover, the implementation has been performed with expanded uncertainties of 1.7 fF for 10 pF and about 22 fF for 100 pF.