LDC602 REVERSE POLARITY TEST
LDC602 Reverse Polarity Test
Developed by the United States (U.S.) Department of Defense, the MIL-STD-704 Aircraft Electric Power Characteristics standard defines electrical power requirements for military aircraft and associated equipment, including voltage, frequency, phase, ripple, and maximum current. The most recent revision of the standard is MIL-STD-704F_CHG-1, published in 2016. However, MIL-STD-704 is not limited to the U.S. military and its subcontractors; it is widely accepted worldwide for evaluating the compliance of military aircraft and power systems. In an aircraft electrical power system supplied by a MIL-STD-704-certified source, the incoming power is converted to the voltage levels required for the operation of onboard equipment. To demonstrate compliance with MIL-STD-704, utilization equipment must be subjected to the applicable tests to assess the effects of specified power conditions and to verify conformity.
Objective Purpose
- To verify that 28V DC utilization equipment is not damaged when the connection is reversed, as specified in MIL-STD-704.
- To confirm that the equipment does not create an unsafe condition during the test.
Test Scope Coverage
- Application of the reverse connection condition (positive and negative leads reversed) for the applicable revision(s) of MIL-STD-704.
- Evaluation of the requirement that the equipment remains undamaged and does not create an unsafe condition, as stated in the relevant table.
Technical Implementation Process
- Upon reversal of the connection, the utilization equipment is considered to have passed if it is not damaged and does not create an unsafe condition.
- To meet this requirement, a positive physical means may be employed to prevent reverse polarity.
Applications Use Cases
- Evaluation of 28V DC utilization equipment used in aircraft power systems.
- Reverse polarity conditions implemented within the scope of MIL-STD-704.
At our STEST facility in Ankara, accredited by TURKAK, we perform the LDC602 Reverse Polarity Test under the MIL-STD-704 Aircraft Electric Power Characteristics standard, in accordance with the TS EN ISO/IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories. For your Environmental, EMI/EMC, and ATP testing needs to enhance the quality and reliability of your products, please contact us.
REQUEST A TEST APPOINTMENT| Nominal Limits | 704A | 704B | 704C | 704D | 704E | 704F |
|---|---|---|---|---|---|---|
| Voltage (NLSS) | 24 Vdc | 22 Vdc | 22 Vdc | 22 Vdc | 22 Vdc | 22 Vdc |
| Voltage (NHSS) | 28.5 Vdc | 29 Vdc | 29 Vdc | 29 Vdc | 29 Vdc | 29 Vdc |