Influence of Adaptor on the Calibration of Inductance Standards

Dewi Mohd Kassim, Dan Bee Kim, Wan-Seop Kim

Abstract

Influence of the adaptor on the calibration of 100 µH inductance standard has been studied using two different homemade adaptors of BPO gold-plated brass (BPO-Au) and banana-copper (BN-Cu) as a function of torque. The inductance (L) and the contact resistance (RC) showed an exponential decrease against the increasing torque from 25 cN·m to 150 cN·m. The measured L and the calculated equivalence series resistance are dependent on the type of adaptors as well as the RC. The analysis of RC and measurement uncertainty of L implies that the BPO-Au adaptor with low RC is suitable for the calibration of inductance. The measured L obtained using BPO-Au and subtracted by the RC agreed well with the certificate value of the PTB within the measurement uncertainty of 140 µH/H. In addition, the calculated inductance of the adaptors shows influence of the lumped components, stray capacitance and series resistance, on the measurements of standard inductors.

Keywords

Adaptor, contact resistance, inductance standard, torque, quality factor

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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