Bulk cable current injection of modulated RF signals will beincluded in MIL-STD-461D and MIL-STD-462A as conducted susceptibilityTest Method CS114. Test Method CS114 is designed to evaluate thesusceptibility of electronic equipment to RF signals coupled into theequipment through the cabling. The author presents an examination ofcable current produced by bulk cable current injection (BCCI) and by aradiated field for two cases: a simple multiwire cable mounted above aground plane with each wire terminated with resistors at both ends, andan operational radar altimeter system mounted on a mockup of an aircraftinstrument panel. For the simple multiwire test case, the bulk cablecurrent induced on the cable by a current injection probe and by aradiated field is examined for two cable shield terminationconfiguraions and two wire termination resistances. The radar altimeter,with a known cable-coupled digital altitude susceptibility, is evaluatedfor several cable shield termination configurations. BCCI testing tendsto produce a more significant standing wave on the test cable thanradiated field testing. Radiated field testing produces greatervariation in the per wire current than BCCI testing. BCCI testing is aneffective technique for evaluating system susceptibilities caused byelectromagnetic-interference coupling into the system through thecabling
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