COMPUTER CONTROLLED SYSTEM FOR COMPLEX PERMEABILITY MEASUREMENT IN THE FREQUENCY RANGE OF 5 Hz − − − − 1 GHz (original) (raw)

Two different methods have been used to determine the complex permeability over the frequency range 5 Hz to 1 GHz of sev-eral toroidal−shaped spinel ferrite samples. Automated measurements are obtained by means of two different computer controlled analyzers. At low frequencies (5 Hz − 10 MHz), an inductance measurement method is used. A simple method was used to elimi-nate the coil effects from the sample response. At high frequencies (1 MHz − 1 GHz), a coaxial transmission line measurement method has been used. The operation principle as well as calibration and compensation procedures for both the analyzers are dis-cussed. Measurements are optimised by the partial elimination of undesirable influences. For computer control and measurement process, two different programs have been written in the VEE environment (Agilent technology).