Design and Calibration of the NBS Isotropic Electric-Field Monitor (EFM- 5), 0.2 to 1000 MHz
Abstract
A broadband rf radiation monitor was developed at NBS for the frequency range of 200 kHz to 1000 MHz. The isotropic antenna unit consists of three mutually-orthogonal dipoles, each 5 an long by 2 m wide. The receiver described in this paper has an accurate measurement range of 1 to 1000 V/m. The readout indication is in terms of the Hermitian or total magnitude of the electric (E) field strength, which is equal to the root-sum-square value of three perpendicular E-field components at the measurement point. Previous radiation monitors designed at NBS have demonstrated the accuracy of a crossed- dipole sensor for measuring the total E-field magnitude of complicated electromagnetic fields. Several prototype units of an advanced instrument have been fabricated and tested. This instrument, the EFM-5 Electric Field Monitor, has nearly perfect isotropy over a 60 dB dynamic range. The dial readout units are dB above 1 V/m (dBV/m) and V/m. Three ranges cover 0 to 60 d BV/m (1 to 1000 V/in) . Electromagnetic field; Electronic instrument design; Field intensity meter; Field strength measurement; Isotropic antenna; Radio frequency radiation; Receiver calibration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1981
- Accession Number
- ADA956093
Entities
People
- E. B. Larsen
- F. X. Ries
Organizations
- National Institute of Standards and Technology