Underwood Jason M
National Institute of Standards and Technology, 100 Bureau Drive, MS 8172, Gaithersburg, MD 20899-8172, USA.
Metrologia. 2018;56(1). doi: https://doi.org/10.1088/1681-7575/aaf5e5.
A detailed analysis of the uncertainties obtained in ac-dc difference measurements with an AC Josephson Voltage Standard (ACJVS) is presented. For audio frequencies and for voltages less than 200 mV, ac-dc transfers with the ACJVS may reduce the combined uncertainty by factors of 2 to 10, compared with conventional methods based on thermal converters. Type A uncertainties are predominantly limited by the thermal transfer standard (TTS), or the digital voltmeter used to acquire the output voltage from the TTS. In agreement with earlier work, the transmission line is the primary contributor to Type B errors for frequencies above 10 kHz. A Monte Carlo sensitivity analysis is used to demonstrate how the uncertainties of transmission line impedance and on-chip inductance impact the accuracy of the rms amplitude conveyed to the TTS.
本文对使用交流约瑟夫森电压标准（ACJVS）进行交流 - 直流差值测量时获得的不确定度进行了详细分析。对于音频频率以及小于200 mV的电压，与基于热转换器的传统方法相比，使用ACJVS进行交流 - 直流转换可将合成不确定度降低2至10倍。A类不确定度主要受热传递标准（TTS）或用于采集TTS输出电压的数字电压表限制。与早期工作一致，对于高于10 kHz的频率，传输线是B类误差的主要来源。使用蒙特卡罗灵敏度分析来证明传输线阻抗和片上电感的不确定度如何影响传递到TTS的均方根幅度的准确性。
