EUROCAE ED-90B PDF

PURPOSE AND SCOPE

The purpose and scope of this Users Guide is to provide additional information and clarification on the test procedures for section 20 and 21. To this end, ED-14 should be read in conjunction with this document.

The purpose of testing to Section 20 of ED-14 is to ensure that equipment will continue to operate within its performance specification when the equipment and its interconnecting wiring are exposed to levels of RF current and RF fields of defined levels. Two test procedures are used. First: the injection of RF currents by means of specially designed injection probes into the interconnecting bulk cables or individual power lines of the equipment. Second: electric field illumination of the equipment and its interconnecting wiring by means of an antenna placed 1 metre away or by the use of a reverberation chamber.

The tests are designed to simulate the effects of high power onboard or external RF transmitters e.g. radar or communications transmitters.

Categories were introduced since Change 1 of Section 20 of ED-14D directly related to the aircraft HIRF environments and have been simplified in the F revision. The use of the test categories is discussed in the appropriate sections of this document.

The purpose of testing to Section 21 of ED-14 is to ensure that equipment will not emit undesired noise in excess of the specified levels. Two set of measurement are performed, one addressing the conducted emission on wiring, by means of measurement probes, and the other the radiated emission of the whole installation including the equipment box and its wiring, by means of a receiving antenna.

For the radiated emission measurement, a major change has occurred in issue F of ED14 by the introduction of reverberation chamber techniques.