MIL-STD-1275 Characteristics Of 28 Volt Dc Input Power To Utilization Equipment In Military VehiclesThis standard defines the operating voltage limits and transient voltage characteristics of the 28 VDC electrical power at the input power terminals to the utilization equipment connected to the electrical power distribution system on military ground vehicle platforms.

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MIL-STD-1275E

voltage.  An example showing "Initial Engagement Surge" (IES) and "Cranking"; i.e., voltage level during active engine cranking is shown in Figure 2.

Figure 2.  Sample starting disturbance waveform.

3.6.2    Voltage spike.

A voltage spike is an energy-limited transient waveform having a duration less than or equal to

1 ms.  These typically result from the interaction of the power delivery system wiring and switching of reactive loads or a mismatch in impedance between the wiring harness and equipment.  Figure 3 shows an example of a spike waveform.

Vpeak

0.9 Vpeak

fosc

0.1 Vpeak

0 VDC

Time

trise

tduration

Figure 3.  Voltage spike.

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