STABILITY OF NULL VOLTAGE OF HALL GENERATORS FOR DIGITAL TRANSDUCER READOUT HEADS

摘要

This report coffers an attempt to find the extent to which drift of the null or zero field voltage limits the usefulness of Hall generators in flux responsive magnetic reading heads. A search of the literature is covered and samples representing the best commercially available construction were tested. For the conditions imposed by a digital transducer application, it appears that heads with a resolution of 5000 bits per inch can be operated without adjustments in a temperature range up to 100 C and with greater resolution over smaller temperature ranges. Erratic changes with temperature limit the degree to which compensation can be effective.