By Topic

Uncertainty Evaluations of an AC Shunt Calibration System With a Load Effect Reduction Circuit

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Kon, S. ; Nat. Metrol. Inst. of Japan, Nat. Inst. of Adv. Ind. Sci. & Technol. (AIST), Tsukuba, Japan ; Yamada, T.

An ac shunt calibration system at the National Metrology Institute of Japan (NMIJ) has been developed. The uncertainties of the system were estimated 3.4 μΩ/Ω for in-phase and 8.6 μrad for quadrature at 55 Hz/5 A. Meanwhile, the enhancement of the system is planned up to 10 kHz/10 A. For this goal, the accuracy and high-frequency performance of the buffer amplifier, which have the largest influence on the uncertainties, have been improved by developing a load effect reduction (LER) circuit. The LER circuit cancels out the effect of output impedance of the buffer amplifier. The effect of the circuit on the buffer amplifier allows the uncertainties of the ac shunt calibration system to be reduced into 2.6 μΩ/Ω and 8.2 μrad at power frequencies.

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:60 ,  Issue: 7 )