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Vol. 105, Issue 6, June 2009, pp.10-17





Accurate Measurement of ‘Q’ Factor of An Inductive Coil Using a Modified Maxwell Wein Bridge Network


Subrata CHATTOPADHYAY, Bijnan. R. MAITY and Sagarika PAL

Department of Electrical Engineering,

National Institute of Technical Teachers’ Training and Research, Kolkata

Block-FC, Sector-III, Salt Lake City, Kolkata-700 106, India

E-mail: subrata0507@sify.com, spal922@yahoo.co.in, bijnan.maity@gmail.com



Received: 18 March 2009   /Accepted: 22 June 2009   /Published: 30 June 2009


Abstract: The Q factor of a coil can be measured by measuring accurately the inductance and effective resistance of the coil for a specific signal. The inductance of an inductive coil is generally measured by usual inductive circuit like Maxwell-Wein Bridge, Hay Bridge etc. which suffer from error due to stray capacitance between bridge nodal point and ground and stray inductance of the inductive coil. The conventional Wagner Earth Technique is not suitable for continuous measurement. In the present paper, a modified operational amplifier based Maxwell-Wein Bridge measurement technique has been proposed in which stray capacitance and stray inductance are minimized. The experiment is done for different value of known inductance & Q factor for a specific signal. The linear characteristic with a good repeatability, linearity and variable sensitivity has been described.


Keywords: Modified Maxwell – wein bridge, Q factor, Inductive transducer, Operational amplifier, Bridge sensitivity


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