International Journal of Research and Innovation in Applied Science (IJRIAS) | Volume IV, Issue VI, June 2019|ISSN 2454-6194 www.rsisinternational.org Page 155 Using the Requirements of the MIL-STD-188-125-1 Concerning Injection of Current Pulse at Testing Resilience of Electronic Equipment to HEMP Vladimir Gurevich Central Electric Laboratory, Israel Electric Corp., Israel, Haifa Abstract - Military standards such as MIL-STD-188-125-1 are usually applied when testing HEMP (High-Altitude Electromagnetic Pulse) resilience of industrial civil electronic equipment on military test benches. This article discusses the feasibility of adhering to requirements of section “Pulsed Current Injection (PCI) Test Procedures” of this standard and concludes that it is not practical to use it for industrial electronic equipment testing. Keywords - MIL-STD-188-125-1, HEMP, Pulse Current Injection Test Procedure, Industrial Electronic Equipment I. INTRODUCTION equirements to resilience of electronic equipment to High-Altitude Electromagnetic Pulse (HEMP) have been covered in various military and civil standards. Civil standards such as International Electrotechnical Commission (IEC) and International Telecommunication Union (ITU), Fig. 1a and military standards of US Department of Defense (MIL- STD), Fig.1b, are widely used internationally. Fig. 1a. Civil standards of IEC and ITU organizations According to basic standards applied to industrial equipment, (particularly the standards used for power industry) i.e. IEC 61000-4-25 [1] and ITU K.78 [2], the test for electronics immunity to HEMP must be divided into two parts: - radiated immunity test (RI) - conducted immunity test (CI) Fig. 1b. Military standard of US DoD Normally, CI is divided into two types: pulse voltage applied to apparatus inputs/outputs and pulse currents induced into equipment circuits. Common standard IEC 61000-4-25 [1] is based on IEC 61000-4-4 [3], which deals with electromagnetic compatibility and does not even mention testing with a pulse current. On the other hand, IEC 61000-4-25 [1] describes the current as "short circuit currents for common mode” (160А and 320А, respectively for immunity test level EC8 and EC9 [1]). According to p.8.4 of the standard IEC 61000-4-25, “the tests are required for all types of conductive lines… and shielding cables”. The standard does not contain a definition for the term “conductive lines”, and it seems that it does not discuss current injection into input circuits of electronic equipment. ITU K.78 [2] standard also deals with control and communication cable shield tests. Nonetheless, when testing HEMP-resilience of equipment, a reference is often made to MIL-STD-188-125-1 [4], which stipulates the necessity to test by current injection into internal circuits of electronic equipment. Is it really necessary? II. CHALLENGES OF USING MIL-STD-188-125-1 Unlike the above-mentioned standards, MIL-STD-188- 125-1 suggests a little different interpretation of the CI test. It includes a separate section called “Pulsed Current Injection R