Measurement of sheet conductance/resistance

摘要

The present invention refers to a method for measuring conductance of a sample, comprising the steps of:
providing a ferrite cup coil (4), an oscillator (2) connected to the coil for applying a voltage to the coil to induce said magnetic field, and an automatic gain control circuit (5) connected to the oscillator; positioning said ferrite cup coil (4) adjacent a sample (6) to be measured;
subjecting the sample (6) to a magnetic field produced by said ferrite cup coil (4); detecting a change in voltage due to the presence of said sample (6) in said magnetic field; converting said voltage change to a conductance value for said sample (6); and comparing said conductance value to a standard conductance value to determine whether said conductance value is within a predetermined acceptable range