MIL-STD-1275: Characteristics of 28 Volt DC Input Power to Military Vehicles
MIL-STD-1275 is a military test standard that defines nominal 28 VDC voltage characteristics that are common to all military ground vehicles, specifically at the input power terminal of electronic/electrical assemblies that are directly connected to the distribution network in question. MIL-STD-1275 establishes a framework for similarity throughout military vehicle platforms. Design authorities are charged with making sure the 28 VDC applied to the input power terminal of the equipment meets MIL-STD-1275 requirements. This standard does not relate to power sources or power systems, but instead focuses on utilization equipment and required operating conditions.
General Requirements
Reverse Polarity
Utilization equipment is required to defend itself against damage caused by input power with reverse polarity; the magnitude of the reverse polarity input current should be equal to or less than the magnitude of the utilization equipment normal operating current, with reverse polarity voltage applied to the input power terminals of the utilization equipment.
Electromagnetic Compatibility
Utilization equipment should be compatible with relevant performance specification requirements for the mitigation of electromagnetic interference, electromagnetic pulses, power switching, and lightning-induced voltage spikes. (Electromagnetic interference is not covered by MIL-STD-1275).
Electrostatic Discharge
Utilization equipment must be compatible with applicable performance specification requirements for electrostatic discharge (ESD) immunity. (Electrostatic discharge is not covered by MIL-STD-1275).
Detailed Requirements
Voltage Compatibility Requirements
The first section of MIL-STD-1275's requirements, section 5.1, offers detailed requirements for the voltage conditions under which the device under test is intended to operate.
5.1.1 Steady-State Operation
Operating voltage range: between 20 VDC and