MIL-STD-2189, MILITARY STANDARD: DESIGN METHODS FOR NAVAL SHIPBOARD SYSTEMS (13 FEB 1987) [S/S BY MIL-HDBK-2189]., This standard provides a guide for conducting 400 hertz (Hz) power system tests to determine that the 400 Hz power system is compatible with the equipment served and that the system characteristics are within the limits specified in DOD-STD-1399, section 300.