MIL-STD-1605 Procedures For Conducting A Shipboard Electromagnetic Interference Emi Survey Surface ShipThis standard provides the procedures for demonstrating compliance with the intra and inter-system electromagnetic compatibility EMC, hull-generated Intermodulation Interference IMI, and electrical bonding requirements of MIL-STD-464 for naval surface ships. In addition, an EMI survey is required for new construction ships and ships receiving overhauls or other major repair work that changes the ships electromagnetic configuration.

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MIL-STD-1605A(SH)

4.1.1 System/sensors/receivers. System/sensors being measured shall not be adversely affected by unintentional emissions. Topside Medium Frequency (MF), High Frequency (HF), Very High Frequency (VHF) and Ultra High Frequency (UHF) receive systems shall not be degraded by ownship unintentional emissions. Electrical/electronic equipment/sensors shall not be susceptible to own ship portable or fixed intentional radiating equipment/systems, or unintentional emitters (equipment/systems).

4.1.2 Hull generated IMI. MIL-STD-464 specifies the applicable requirements for hull-generated IMI. IMI tests shall be conducted on ships that contain HF broadband antennas, and/or ships that contain two or more HF narrow band transmit antennas. When HF narrow band antennas are tested for IMI all possible antenna combinations shall be tested. IMI products above the 19th order shall be located and mitigated.

4.1.3 All up system to system test. To assess compliance with MIL-STD-464, "All Up Systems to Systems Test" shall be conducted by evaluating systems interaction and/or compatibility with other ship systems, and identifying EMI victim systems when all ship systems are functioning simultaneously.

4.1.4 Portable transmitters. Tests shall also determine whether emissions from portable transmitters adversely affect the operation of the ship's below deck electrical/electronic equipments/systems.

4.2 Test planning. A detailed EMISTP shall be developed in accordance with DI-EMCS-81782 and approved by the procuring activity. The EMI survey shall be well planned and coordinated with the ship, appropriate activities and all participating personnel to ensure optimum utilization of dockside and underway test time. The specific equipments to be tested shall be identified by nomenclature and location. The number of equipments and monitoring positions can then be determined and a required test time can be affixed to the total survey.

4.2.1 Phase I and II testing. Phase I and II testing (see 5) shall be in accordance with an approved EMISTP. Portions of the Phase I tests may be scheduled to coincide with load testing or other check-out tests of deck machinery, providing the Phase I test results are not impaired. Upon completion of the testing a detailed EMISTR shall be developed in accordance with DI-EMCS-81777 and forwarded to the procuring activity

5. DETAILED REQUIREMENTS

5.1 Phase I tests. Phase I tests shall be performed at a time and location when the external local man-made electrical and natural RF ambient environment does not exceed the levels in figure 1 over the frequency range of

2 MHz to 460 MHz using table I bandwidths. When the unintentional emissions exceed 10 dB to the sensors receiver noise floor, source location techniques shall be used to isolate and ultimately mitigate the excessive

emissions. Phase I tests shall be conducted with electrical electronic equipment/systems turned on, in accordance

with 5.1.3.