Barkhausen Noise Measuring Device for Magnetoresistive Heads
Original Publication Date: 1978-Aug-01
Included in the Prior Art Database: 2005-Feb-21
Magnetoresistive (MR) heads used for reading magnetically encoded bar data must be tested after manufacturing in order to select those heads which provide an output falling within prescribed limits in order to successfully decode the magnetically encoded bar data. This article describes a testing circuit for these heads which measures the Barkhausen noise, i.e., variations in the output of the head. Measurement of this characteristic is difficult; however, the circuit described herein removes the subjectiveness of the measurement and permits a highly accurate determination of those heads which may be successfully used.