阻抗参数测量校准设备的一些特点

M. Surdu
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引用次数: 0

摘要

考虑了精确阻抗计校准的特殊性。作者指出,校准过程中最重要和最复杂的部分是确定两个不确定度分量:附加误差和由仪表传递函数的非线性引起的误差。加性误差的确定问题是由于目前并没有精确的零阻抗标准。作者考虑建立合适的零阻抗标准,该标准的阻抗可以任意接近零,其阻抗残差可以根据其几何尺寸来估计。这种标准的实施非常简单、廉价且易于实施。此标准在DC上运行良好。用于交流测量的零阻抗标准由两个同轴T形分支组成,它们通过插入件连接。该标准消除了连接“零阻抗标准”和测量装置的适当电缆的电流和电压回路之间可能存在的互感连接的影响。为了确定传递函数的非线性,作者分析了使用非精确电阻或替代阻抗分配器。为了在整个测量范围内使用这种分隔器,开发了这些分隔器的特殊结构。在这些结构中,分配器标准的测量与它们的端子的阻抗一起提供。它消除了这些端子的阻抗对仪表校准或单位传输精度的影响。开发了两个标准分频器的特殊复合体,以简化阻抗计的精确校准。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Some Features of the Calibration Equipment for Measuring the Parameters of Impedance
Peculiarities of the accurate impedance meters calibration are considered. Author show that most important and complicate part of calibration procedure consists in determination of two uncertainty components: additive error and error, caused by nonlinearity of the meter transfer function. Problems of the determination of the additive error are caused by the fact, that there no exist accurate standard of the zero impedance. Author considers the creation of proper zero impedance standard, whose impedance can be arbitrarily close to zero and its impedance remnant can be estimated on the base of its geometrical dimensions. Implementation of such standard is very simple, cheap, and easily carried out. This standard works well on DC. Standard of zero impedance for AC measurement consists of two coaxial T-branches, which are connected through insertion piece. Such standard eliminates influence of the possible mutual inductive connection between current and voltage loops of the proper cables, which connect the “zero impedance standard” and measuring devise. To determine nonlinearity of the transfer function author analyze using of the non accurate resistive or alternative impedance dividers. To use such dividers in whole range of measurements special structures of these dividers where developed. In these structures measurement of the divider standards are provided together with impedance of their terminals. It eliminates influence of the impedance of these terminals on the accuracy of meter calibration or unit transfer. Special complex of two-standards dividers were developed to simplify the accurate calibration of the impedance meters.
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