CIRCUITRY FOR COMPENSATING VARIATIONS OF THE TRANSMISSION FACTOR OF A LINEAR MAGNETIC FIELD SENSOR

摘要

1. A circuit arrangement for compensating for fluctuations in the transmission factor of a linear magnetic field sensor (1) comprising a magnetic coil (4) connected to a current source (3) for producing an auxiliary magnetic field which is superimposed on the magnetic field to be measured, means (5-6) for determining the slope of the transmission characteristic of the magnetic field sensor by ascertaining the component, which is produced solely by the auxiliary magnetic field, of the output signal of the magnetic field sensor, and a division member (7) for division of the output signal by the slope, characterized in that the magnetic field sensor (1) is a magnetic field/voltage transducer, that the auxiliary current (ih ) produced by the current source (3) is an alternating current or pulsating direct current, that the output of the magnetic field sensor (1) and the current source (3) are connected to a multiplier (5) and that the output of the multiplier (5) is connected by may of a low pass filter (6) to the division member (7).