MIL-STD-704 Aircraft Electrical Power Specifications Standard, prepared by the United States (US) Department of Defense, is a military standard that covers issues such as voltage, frequency, phase, fluctuation and maximum current in a military aircraft and its equipment. The most current version of the standard is MIL-STD-704F_CHG-1, published in 2016. However, this standard is not a standard that only covers the US military and its subcontractors, but is a globally accepted standard for evaluating the suitability of military aircraft and systems. It is converted to the voltage levels required for the operation of the equipment used in the aircraft power system, which comes with a power source that complies with the MIL-STD-704 standard. In order for a piece of equipment to operate in accordance with the MIL-STD-704 standard, it must pass MIL-STD-704 tests to see its effects under difficult conditions and to verify its conformity.

The LDC602 Reverse Polarity Test is used to verify that 28V DC power handling equipment operates at specified performance when subjected to abnormal voltage transients as specified in MIL-STD-704.
For valid versions of MIL-STD-704 with the LDC602 Reverse Polarity Test and when the positive and negative connection is reversed as specified in the table, the use equipment is considered passed if the use equipment is not damaged and does not cause an unsafe condition. To meet this requirement in the LDC602 Reverse Polarity Test, a positive physical means to prevent phase reversal can be used.