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文章分析了直流数字电压表标准装置检定或校准过程中不确定的来源,并详细给出了各不确定度的评定方法和结果。 相似文献
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《中国新技术新产品》2015,(18)
文中研制的10 k A强直流电流标准源由18路600 A电流源并联至汇流排,进行大电流输出。其精度达100 ppm/a。该标准源采用了新型宽频直流比较仪技术,开关电源并联的分布式电源系统,以及全面的过压、过流、电流开路保护系统等。通过实验对600 A源进行性能测试,其短期稳定性均保持在10 ppm/min水平。该标准源具有高精度、高安全性、操作智能化、检定自动化等优点,为建立直流大电流量值传递体系和检测规范提供了依据。 相似文献
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为提升磁调制式直流电流比较仪的性能,探索低磁势至额定磁势下的比例准确度,提出基于参考绕组法的自校准方法。分析含有参考绕组的DCC结构,通过测量独立的10组一次绕组与参考绕组和10组一次绕组串联后与二次绕组的差值电流,结合公式推导计算,得到一次绕组相对于参考绕组以及二次绕组的比例实际值和相应误差。测量结果的相对误差和不确定度都达到10~(-8)量级。采用具有溯源性的传递比较法对自校准结果进行验证,经过与上一级计量机构的测量结果和不确定度比较,满足JJF 1033-2016《计量标准考核规范》对测量结果验证的要求。基于参考绕组的DCC自校准方法具有测量结果不确定度小和测量过程简单的优点,满足直流电流比例溯源的要求。 相似文献
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在对6(1/2)位数字多用表直流电压进行测量时,不同电压值对应的测量不确定度不尽相同。本文以直流电压10V量程10V点为例进行测量结果不确定度的评定与分析。一、概述依据JJG315-1983《直流数字电压表试行》检定规程三、7.1,采用直流标准电压发生器法,校准数字多用表直流电压示值误差。选取FLUKE5720A作为高精度 相似文献
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本文介绍了ZWL-Ⅱ型直流电流源的工作原理和电路特点,并详细介绍了直流比较仪各主要部分的原理及其设计的有关问题,提出了用磁调制直流电流比较仪作电流采样环节的方案,从而保证电源的高稳定性和恒流输出特性。 相似文献
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依据JJF 1638-2017《多功能标准源校准规范》,对5720A多功能标准源直流电压的校准方法进行探讨,并给出不确定度评定示例。 相似文献
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在参加实验室直流电压比对中,利用高精度数字多用表的比率功能做比率器,多功能标准源输出的直流电压实际值作为已知值,采用比率的方法测量固态直流电压标准盲样。采用此法进行直流电压比对,测量准确可靠,满足测量的不确定度要求,对一般实验室具有借鉴意义。 相似文献
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介绍了一种利用最新研发的电子元件和电流检测技术设计的DC 100A直流电流标准装置.该标准采用"ZERO-FLUK"技术解决了电流采样单元的零温漂、零功耗问题;采用高分辨力数模转换控制电路解决了系统控制精度和稳定性的问题. 相似文献
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《IEEE transactions on instrumentation and measurement》1979,28(3):205-211
Cryo current comparators (CCC's) are known as current ratio standards with small ratio errors. These small errors are easily proven for windings with 1:1 ratios only. For ratios other than 1:1, say 1: N, the errors must be determined by a step-up calibration procedure based on 1:1 intercomparisons of all windings. This procedure becomes tedious as N gets larger than 1. In addition the uncertainty in the overall error is enhanced by each calibration step. This paper shows that by using a toroidal CCC design the step-up calibrations become unnecessary. Instead of determining the actual error, the special winding configuration has a maximum error which, in principle, can be determined by two simple 1:1 measurements. Therefore, the tedious calibration procedure and the overall uncertainty are reduced. High dc current ratios can now be established with this technique with errors smaller than 1 part in 1010. 相似文献
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《IEEE transactions on instrumentation and measurement》1965,14(3):149-156
Measurements and comparison of standard resistors are generally carried out in Standards Laboratories employing the well-known Wheatstone and Kelvin bridges. In the present paper the use of a dc current comparator has been described in order to compare a set of standard resistors. The results obtained lie within 1 to 5 ppm of those determined by the conventional methods. It is believed that with some refinements this method may, in the future, be accepted as an alternative approach of measuring standard resistors in laboratories. 相似文献
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本文介绍了依据JG124-2004<电流表、电压表、功率表及电阻表>,用三相交直流仪表检定装置,输出标准直流电压值对直流电压表进行检定的方法,以及测量结果的不确定度的评定. 相似文献
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《IEEE transactions on instrumentation and measurement》1968,17(4):285-290
A short-circuited-ring electrodynamic ammeter is described. The short-circuited ring is supported by a fine quartz fiber and is suspended midway between the inner and outer conductors of a coaxial transmission line. The current on the line is found by measuring the torque exerted against the ring by the current on the coaxial line. A new technique is given for determining the relationship between the torque on the ring and the current on the transmission line, and is compared with the technique used in the past. The new method is an application of the resonator action theorem used by Cullen for calibrating a torque-operated microwave wattmeter. The major weakness in the previous evaluations of the torque-current relation is discussed. The ammeter is useful for measuring current from 1 to 100 amperes over the frequency range 1 MHz to 1 GHz, with an uncertainty of the order of 0.5 percent. 相似文献
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详细介绍了高电压直流标准源的压制过程,直流高压标准源通过对高压的精密控制、对高压分压电路的准确测量以及合理的结构设计,具备了较高的技术性能。 相似文献