H-field sensor

As earlier reported in this magazine from January 1996 all (new) electronic and electrical apparatus must meet the European standard for electr-magnetic compatibility (EMC). Per home-constructed equipment, the sensor described here will be found useful, yet simple to make. lt is in fact a small loop antenna, made from 50 Ω coaxial cable, that functions as an H-field (magnetic field) sensor. AIthough it is simple, it is capable of detecting a magnetic field caused by, for instance, a printed circuit board.