A New Near-Zone Electric Field-Strength Meter

The National Bureau of Standards has recently completed the development of prototype instrumentation for measuring the electric field components of complex, high-level, near-zone electromagnetic fields from O . 1 to 1 00 0 volts per meter, a t frequencies from 1 50 kHz to 30 MHz with a present uncertainty of less than ± 2 dB . The successful design of the NBS meters i s based o n the use o f a novel form o f telemetry, employing a completely non-metallic electrical transmission line, which apparently has not been fully exploited heretofore. This avoids the perturbing effects on the field being measured, usually caused by field-strength meters employing metallic RF transmission lines.