Instrumentation configurations for the performance of HEMP test procedures

The test procedures of MIL-STD-188-125, which are used to demonstrate HEMP (high-altitude electromagnetic pulse) hardness of fixed ground-based communications sites, are considered. Currently existing as a draft, the standard establishes a minimum specification for the design, engineering, fabrication, installation, and testing of ground-based facilities which perform critical, time-urgent command, control, communications, computer, and intelligence (C⁴I) missions. Three categories of testing, shielding effectiveness, pulsed current injection, and low-level continuous wave (CW) immersion, are integrated in the standard´s HEMP hardness evaluation process. Prototype test equipment, used to perform current injection and CW immersion procedures, was deployed in Europe to support a NATO test program which established hardness maintenance baselines for ground based C³I facilities. The details of these tests and performance data for the mobile, integrated test equipment are presented