4. GENERAL REQUIREMENTS
4.1 General. Electronic, electrical, and electromechanical equipment and subsystems shall comply with the applicable requirements in 4.2 through 4.8. The requirements are in addition to the applicable emission and susceptibility requirements defined in other portions of this standard.
4.2 Joint procurement.
Equipment or subsystems procured by one DOD activity for multi-agency use shall comply with the requirements of the user agencies.
4.3 Filterinq (Navy only) .
The use of line-to-ground filters for EMI control shall be minimized. Such filters establish low impedance paths for structure (common-mode) currents through the ground plane and can be a major cause of interference in systems, platforms, or installations because the currents can couple into other equipment using the same ground plane. If such a filter must be employed, the line-to-ground capacitance for each line shall not exceed 0.1 microfarads (~F) for 60 Hertz (Hz) equipment or 0.02 pF for 400 Hz equipment. For submarine DC-powered equipment and aircraft DC-powered equipment, the filter capacitance from each line-to-ground at the user interface shall not exceed 0.075 ILF1kWof connected load. For loads less than 0.5 kW, the filter capacitance shall not exceed 0.03 )LF. The filtering employed shall be fully described in the equipment or subsystem technical manual and the Electromagnetic Interference Control Procedures (EMICP) (See 6.3).
Replaced/Superseded by document(s)
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This standard establishes the design requirements for the control of the electromagnetic emission and susceptibility characteristics of electronic, electrical, and electromechanical equipment and subsystems designed or procured for use by activities and agencies of the Department of Defense. Such equipment and subsystems may be used independently or as an integral part of other subsystems or systems. Data item requirements are also included.
1.2.1 General applicability.
The applicability of the emission and susceptibility requirements is dependent upon the types of equipment or subsystems and their intended installations as specified herein.
1.2.2 Tailorinq of requirements.
Application-specific environmental criteria may be derived from operational and engineering analyses on equipment or subsystems being procured for use in specific systems or platforms. When analyses reveal that the requirements in this standard are not appropriate for that procurement, the requirements may be tailored and incorporated into the request-for-proposal, specification, contract, order, and so forth.