This white paper discusses results from 19 months of round robin testing initiated to check the current state of equipment, designed to measure Fiber Optic Encircled Flux (EF). There was some skepticism that, since EF represents a very restricted launch, the EF equipment would not have the precision to make such a measurement with low uncertainty. A similar test was conducted within IEC SC86B several years ago, and the data showed that some modal launch equipment measured outside the EF template. It was not revealed if the equipment was properly calibrated for that test. The purpose of the new round robin test was to measure variability of EF measurement equipment, and to provide a level of confidence for those making these types of measurements.
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