Wang Yicheng, Schlamminger Stephan
National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD, United States of America.
Metrologia. 2024;61(5). doi: 10.1088/1681-7575/ad7590.
We have built and demonstrated a digital four-arm bridge for the comparison of resistance with capacitance. The digital four-arm bridge mimics the classical quad bridge in the digital domain with three balances: the source balance, the detector balance, as well as the main balance. Due to correlation, the required precision of the source voltages is only of the order of the square root of the ultimate bridge precision. For the comparison of a 100kΩ resistor with a 1 nF capacitor near 1592 Hz, the combined standard uncertainty is 5 × 10).
我们构建并演示了一种用于电阻与电容比较的数字四臂电桥。该数字四臂电桥在数字域中模拟经典四象限电桥，具有三种平衡：源平衡、检测器平衡以及主平衡。由于相关性，源电压所需的精度仅为最终电桥精度平方根的量级。对于在1592 Hz附近比较100kΩ电阻器与1 nF电容器，合成标准不确定度为5×10⁻⁵。
