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)

c. Monitor ship control systems. Monitor ship control systems during normal underway operations while electrical machinery, such as fuel/lube oil pumps, cooling fans, fire pumps, motor controllers, contact relays, and air compressors are being operated and cycled. Functions to be monitored shall include, but not limited to:

(1) Alarm Panels

(2) Tank Level Indicators

(3) Pressure Indicators

(4) Flow Rate Indicators

(5) Interior Voice Communications

(6) Video Monitors

(7) Below Deck Wireless Sensors

(8) Other Suspected Victim Equipment

It is particularly important that the specific ship's operating evolutions and transmitter status at the time EMI is noted be fully documented.

d. Interference from the ship's superstructure. All false targets shall be documented by recording their range and bearing as observed on the indicator display, and any unintentional emissions interference effects shall be documented by describing the observed interference effects.

5.2.2 Phase II preliminary examination. A visual examination shall be made sufficiently in advance of Phase II tests to permit correction of conditions that are likely to adversely affect the test results. The examination shall confirm that:

a. Bonding, grounding, and other techniques for EMC and safety have been accomplished in accordance with

MIL-STD-1310.

b. Multicouplers, filters, and blankers are installed and operating

c. There are no missing or visibly defective electronic equipments or broken or missing antennas/transmission lines.

d. All loose metallic items that are not a normal part of the ship have been removed from the topside areas. Deficiencies discovered during the examination shall be corrected prior to starting Phase II interference tests.

5.2.3 Phase II test method.

5.2.3.1 All up system-to-system EMI testing. All up system-to-system EMI testing involves sequentially radiating all ship's transmitters starting from the highest frequencies while monitoring all ship's electrical/electronic systems to identify changes in system performance caused by EMI. After a transmitter is sequentially radiated, the equipment shall remain in the radiate condition until the end of the test. The transmitters shall be operated at maximum rated power and shall be exercised in each expected operational mode, channel or frequencies to explore victim vulnerability. Particular emphasis shall be placed on potential source/victim combinations identified during test planning. When EMI is noted, shut down or secure the specific transmitter to verify the EMI disappears, allowing a determination (tentative) of the potential EMI source.

5.2.3.2 Hull generated intermodulation. Testing for hull generated intermodulation interference shall be accomplished utilizing an appropriate Navy Standard intermodulation interference test from NAVSEA Drawing STD-407-5291780.

5.2.4 Personnel safety. The safety precautions and operating procedures of NAVSEA OP 3565/NAVAIR 16-1-

529 and ship and shipyard safety guidance shall be adhered to at all times.