In preparation for the submission of CMCs and to facilitate internal assessments of the voltage measurement capabilities at the designated national laboratory of Lithuania, the Semiconductor Physics Institute, Vilnius, Lithuania, a bilateral comparison is carried out at
The full measurement cycle is thus foreseen to be performed within one month time to reduce the effect of long and medium term drift from the voltage reference standards.
The comparison is intended to support the future CMC claims of SPI. DFM has participated in the comparisons BIPM.EM-K10.a, EUROMET.EM.BIPM-K10.a and EUROMET.EM.BIPM-K11, and will function as pilot and coordinating laboratory.
Final Report 2006-10-13
The comparison has been completed and results are published in the KCDB.
A comparison of Josephson voltage calibration of Zener reference standards has been conducted. Two Fluke type 7000 voltage reference standards were measured at the two laboratories at 1.018 V and 10 V. SPI performed two sets of measurements bracketing DFM measurements.
Results are compared by averaging the individual results of the sets of measurements, and referring SPI measurements to the mean date of DFM measurements by linear interpolation. The uncertainty assigned to each set was determined from the measurement capability of the laboratory combined with the observed standard uncertainty of the mean of the measured voltage. The results at the two voltages are:
U = 1,018 V: ΔUSPI-DFM = 1.018 V ·(–0.042 ± 0.044) ´ 10-6
U = 10 V: ΔUSPI-DFM = 10 V ·(–0.010 ± 0.020) ´ 10-6
Using the DFM result as link, the SPI Degree of Equivalence to the results in EUROMET.EM.BIPM-K11 (10 V) would become:
DSPI = DDFM + ΔUSPI-DFM = 0.03 µV ± 0.47 µV.