Comparison of electric field strength standards at NPL.

This report presents the results of a comparison of electric field strength standards at NPL. The calibration factors of three optical electric field sensors were measured in the different free-space and guided-wave electric field standards facilities at NPL and the results compared. The excellent agreement between the calibration factors obtained in the different facilities gives confidence in the basis of four distinct methods that provide traceability for E-field strength, namely: the calculable dipole, the TEM cell, the standard gain horn antenna and matched waveguide systems.