Toward extending the frequency of the AC-DC voltage transfer at Silesian University of Technology up to 10 MHz

摘要

The paper presents steps taken to extend the frequency range of the thermal AC-DC voltage transfer maintained at SUT up to 10 MHz. The properties of the measurement setup are described after replacing the Fluke 5700A calibrator used as AC voltage source up to 1 MHz with the Fluke 6071A RF signal generator. Next the results of the consistency checking of the AC-DC transfer difference measurements performed with the new measurement setup is presented. The results of verification of the correctness of the calculated and measured AC-DC transfer differences of the two calculable thermal AC voltage standards are presented in 1-10 MHz frequency range. The inconsistency of the measured AC-DC transfer difference is below 55 μV/V at 10 MHz, when comparing PMJTCs with SJTC and below 25 μV/V when comparing PMJTCs among themselves. The AC-DC transfer difference of the SUT calculable AC voltage standard was calculated from the modified mathematical model for frequencies up to 10 MHz. Direct comparison of the 3 V calculable AC voltage standard with the 5 V one confirmed correctness of the results obtained from the mathematical model.