Schlamminger Stephan, Koffman Andrew, Schmidt James, Waltrip Bryan, Wang Yicheng
University of Regensburg, Regensburg, Germany; University of Zurich, Zürich, Switzerland; University of Washington, Seattle, WA, USA; National Institute of Standards and Technology (NIST), Gaithersburg, MD, USA.
University of Maryland at College Park, College Park, MD, USA; University, Nashville, TN, USA; Electricity Division (now Quantum Measurement Division), National Institute of Standards and Technology, Gaithersburg, MD, USA.
IEEE Trans Instrum Meas. 2023;72. doi: 10.1109/tim.2023.3322503.
Four terminal-pair air capacitors are important transfer standards to calibrate LCR meters up to a frequency of 10 MHz. We report a simple and new method to obtain the frequency dependence of the four terminal-pair capacitance of these standards using a four-channel vector network analyzer (VNA). The frequency dependence of the capacitance of an air capacitor and its uncertainty can be obtained from a single set of measurements without changing connections between the standard and the VNA, as has been the case in previously published work. The calculation of the frequency dependency is straightforward and model-independent. Nevertheless, an elementary model is provided to explain the observed frequency dependence. This article allows every laboratory with a four-channel VNA to measure the frequency dependence of these capacitors. Hence, a significant shortening of the traceability chain is achieved.
四端对空气电容器是校准频率高达10 MHz的LCR测量仪的重要传递标准。我们报告了一种简单的新方法，使用四通道矢量网络分析仪（VNA）来获得这些标准的四端对电容的频率依赖性。与之前发表的工作情况一样，无需改变标准与VNA之间的连接，通过一组测量就可以获得空气电容器电容的频率依赖性及其不确定度。频率依赖性的计算很简单，且与模型无关。不过，我们提供了一个基本模型来解释观察到的频率依赖性。本文使每个拥有四通道VNA的实验室都能够测量这些电容器的频率依赖性。因此，实现了溯源链的显著缩短。
