Development of definitions and limits for frequency transients and frequency modulation in 380- to 420-cps aircraft electric systems

This paper describes in detail the work of the Naval Air Development Center (NADEVCEN) which attempted to develop the definitions and limits for frequency modulation and frequency transients in 380- to 420-cps (cycles per second) aircraft electric systems. In order to provide a common base for such definitions, the instruments used for making the measurements of these characteristics were examined and delineated in terms of required performance criteria. The definitions and limits developed are recommended for integration into appropriate specifications.