Precise Measurements of Electromagnetic Fields

A design of field strength measuring equipment is described wherein the emphasis has been laid upon ability to secure precise measurements in a limited range rather than extreme flexibility. A consideration of the suitability of various fundamental methods for precision work is presented. A circuit design is described by which certain difficulties associated with the insertion of the standard signals into loop circuits are eliminated. An attenuator is described wherein the effects of unavoidable stray reactances are minimized. Experimental results are given indicating ability of the design to achieve accuracies to within better than one per cent at broadcast frequencies. Comparison is made with accuracies attained in the field with alternative methods.