MIL-STD-1310H(NAVY)
3.21 Ground, radio frequency (RF). Unless otherwise specified herein or in an Installation Control Drawing (ICD), an RF ground is the ground that conducts RF energy in the ship's ground plane and establishes between the connections a common RF potential with ship's ground plane.
3.22 Ground, 360 degrees (peripheral). A continuous metal-to-metal bond, existing or provided, around
the outer perimeter of a metallic item or cable shield terminating at or penetrating through a metal surface that is at ground potential.
3.23 Intermodulation interference (IMI). The production in a nonlinear element of frequencies equal to the sums and differences of integral multiples of two or more frequency sources which cause EMI in another equipment or system. The nonlinear element may be internal or external to electronic systems.
3.24 Maintenance-related EMI. A designation assigned to EMI problems that can have severe, medium, or mild mission area impact, but have been proven to result from improper installation or inadequate maintenance. Proper installation and continuing maintenance will prevent maintenance-related EMI from affecting
operations.
3.25 Mobile-transportable electrical equipment. Mobile-transportable electrical equipment is any equipment that:
a. Can be moved from place-to-place for use. b. (Normally) remains stationary while in use.
c. Is powered by a plug-in power cord versus being hard-wired to the electrical supply.
3.26 Non-developmental item (NDI). A statutory term describing items that have been previously developed fo7r use by Federal, State, local or allied governments.
a. An item of supply that is available in the commercial marketplace.
b. A previously developed item of supply that is in use by a department or agency of the United States Government, a State or local government, or a foreign government with which the United States has a mutual defense cooperation agreement.
c. An item described in a or b above that requires only minor modification to conform to the procuring agency's requirements.
d. An item currently being produced that does not conform to requirements specified in a through c above solely because the item is not yet in use, or not yet available in the commercial marketplace.
3.27 Nonlinear junction. A contact area between two metallic surfaces which exhibits nonlinear voltage- current transfer characteristics when subjected to an RF voltage. This nonlinearity is usually caused by corrosion or other semi-conducting materials in the contact area.
3.28 Portable equipment. Any equipment moved from place-to-place for use and (normally) capable of being hand-held while in operation. Portable equipment includes portable movable equipment enclosures as well as handheld equipment.
3.29 Shield. A metal barrier of solid, screen, or braid construction used to protect electronic components, wires, or cables from EM energy; or used to reduce the emission of EM energy from components, wires, or cabling.
3.30 Shielded area. Area not directly exposed to EM energy. This includes shielded spaces, compartments and rooms; areas inside the hull and superstructure of metallic hull ships; areas inside metallic shelters, a
metallic enclosure or a metallic mast; and areas in screen rooms on nonmetallic hull ships.
3.31 Terminal protection device (TPD). A quick reaction switching device which is installed between a susceptible circuit and ground to protect electronic components from lightning and EMP damage. TPDs may also be identified as transient protection devices or surge protection devices.
3.32 Topside areas. All shipboard areas continuously exposed to the external electromagnetic environment, such as the main deck and above, catwalks, and those exposed portions of gallery decks.
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