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

40

35

33V

30

25

20

Volts

15

10

5

12V Initial

Engagement

Surge

16V Cranking Surges

Notes:

20V

The solid line includes ripple voltage.

0

-1                  0                    1                    2                  3                   28                 29                 30                 31                 32                33

Time (s)

Figure 6.  Starting disturbance limits on 28VDC systems.

5.1.3    Transient disturbances.

This section describes transient waveforms and applies to all utilization equipment.

5.1.3.1 Voltage spikes.

5.1.3.1.1   Injected voltage spikes.

Utilization equipment shall operate without degradation or damage when subjected to voltage spikes within the limits shown in Figure 7.  The maximum rise time (tRISE) of the injected spikes is 50 nanoseconds, and the maximum total energy content of a single spike is 2 Joules.

5.1.3.1.2   Emitted voltage spikes.

Emitted voltage spikes from utilization equipment shall be within the limits shown in Figure 7. The maximum total energy content of a single emitted spike is 125 millijoules (mJ).

5.1.3.2 Voltage surges.

5.1.3.2.1   Injected voltage surges.

Utilization equipment shall operate without degradation or damage when subjected to voltage surges within the limits shown in Figure 8.  The maximum total energy content of a single surge is 60 Joules (J).

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