Four-terminal mutual inductor for calibration of the lock-in amplifier at mV ranges

Abstract

This paper describes a method for calibrating the accuracy and linearity in quadrature part of the lock-in amplifier at mV ranges. The method is based on the use of the four-terminal mutual inductor and three-branch binary inductive current divider (BICD). The measurement standard uncertainties are presented at frequencies from 20 kHz to 200 kHz.Index Terms -Four-terminal mutual inductor, binary inductive current divider, current-voltage method, binary inductive voltage divider.