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Remacomp® C for computer controlled measurement of the dynamic characteristics of soft magnetic materials - 11843 REMACOMP C

for computer controlled measurementof the dynamic characteristicsof soft magnetic materials

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Introduction

The REMACOMP
® C family of instruments comprises automatic, computer controlled measuring systems to determine dynamic (AC) magnetic properties of soft magnetic materials. This information is required in materials research, quality control and system design. The characteristic quantities are obtained from measurements of the hysteresis loop. The most important properties that can be derived are core losses, remanence, coercivity and permeabilities. Many components of the REMACOMP H in the specimen is calculated from the current in the primary winding, which is measured using a precision shunt of negligible inductance. The flux density B is determined by numerical integration of the voltage that is induced in the secondary winding. The time courses of these voltages are scanned by two fast analog-to-digital converters. From the data of one period the hysteresis loop and characteristic values like core losses, remanence, coercivity and permeability are calculated. The hysteresis loop appears au- tomatically scaled on the computer monitor. Besides the hysteresis loop, the course in time of field strength and flux density can also be displayed. Digital display of the results on the visual display unit excludes reading errors. The graphic display obviates the need for time-consuming evaluation and conver- sion of data. The application of digital signal processing techniques throughout is reflected in the high degree of accuracy, ease of operation, short measuring time and good documentation. The equipment is therefore suitable for use in the laboratory and quality control. The basic measuring system corresponds to the international standard IEC 60404-6 (digital method). For other specimen shapes than rings various fixtures are available. An Epstein frame, which is included in the model REMACOMP
® C except the power amplifier are integra- ted in the system computer. This minimizes the external cable connections. The out- put values of the external power amplifier can be adapted to the specific requirements within a wide range. The instrument covers a frequency range from 10 Hz up to 2 kHz, 10 kHz or 500 kHz, depending on the selected components. Typical specimens are ring cores, either solid or tape-wound. They have a closed magnetic path which means that a closure yoke is not necessary. The samples must be equipped with a primary and secondary winding for test. The magnetic field strength
® C – 1200 allows measurements following the standard IEC 60404-2. With single sheet fixtures of different sizes measurements on strips in open or closed circuit are possible. Multi-turn winding adapters allow e.g. measuring rings and stampings of sheet without applying individual windings.