Int. J. Metrol. Qual. Eng.
Volume 8, 2017
|Number of page(s)||8|
|Published online||02 October 2017|
Completely automated system for capacitance measurement through new accurate capacitance box
Department of Electrical Quantities Metrology, National Institute of Standards (NIS),
* Corresponding author: firstname.lastname@example.org
Accepted: 12 September 2017
Capacitance boxes (CBs) are extensively used in electrical laboratories for calibration of capacitance measurement devices. In this paper, a new recently fabricated CB has been presented to be used for automatic calibrations through its 4096 output capacitance steps in the range from 100 nF to 150 μF. Full specifications and characterization of this new CB have been investigated in detail including its frequency and voltage dependences. The presented CB has relative accuracy in the range from ±5 × 10−5 to ±5 × 10−4, whereas the relative uncertainty due to the combination effect is less than 15 ppm. The described CB has been used to construct fully automated capacitance measurement system at the National Institute of Standards (NIS), Egypt, using Andeen-Hagerling 2700A, opt. E & opt. C, Ultra-precision Capacitance Bridge up to 1 μF. The second fully automated system for capacitance measurements is formed at NIS by An Agilent E4980A LCR meter, which is used to measure and characterize the higher capacitance values of the fabricated automated CB. Technical comparison between a previous CB and the new introduced one has been done to evaluate its performance.
Key words: new capacitance box / automated measurement / capacitance measurement / decade capacitance / microcontroller technique
© M. Helmy A. Raouf, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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