Comparison between GTEM and OATS radiated field emission measurements

Open area test site (OATS) is the standard test facility on radiated emission testing. The necessity of alternative methods to OATS that meet the requirements of CISPR or EN standards and the time, cost and space limitations of traditional alternative facilities (as semianechoic chambers) are impelling new methods; the problem using those new facilities is the acceptance of the measurements. Currently, gigahertz transverse electromagnetic field cell (GTEM) is gaining acceptance in this area of EMC, and an FCC Public Notice, dated December 1993, has established a "limited equivalence" to open area testing. This paper presents an OATS/GTEM correlation study using three different devices included in two European standards; this correlation is supported by an original statistical analysis made for every frequency and device. The results are discussed.