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

105

100

100V, 50 ms

Notes:

The solid line includes ripple voltage.

Source Impedance for Injected Surges:

Surges originate from a nominal source impedance of 500 mn

95

Utilization equipment may be

45                                                                                       damaged in this voltage range

40

Volts

33V, 500 ms

35

33V

30

25

20

18V

20V

15                                                                                                                                        20V, 600 ms

10                                                             18V, 500 ms

Utilization equipment may be

5                                                                                       inoperable in this voltage range

0

1                 100               200               300               400               500                600               700               800                900              1000

Time (ms)

Figure 8.  Envelope of surges for 28VDC systems.

5.2.2    Calibration of test equipment.

Test equipment used to verify parameters such as current, voltage, rise/fall time, etc. of the test setup shall have traceable calibration to a national standards body, such as NIST, and within the calibration period at the time of the test.

5.2.3    Nominal voltage.

For purposes of verification, the term "nominal" when used to describe voltage shall mean the

stated voltage ±1%, unless otherwise stated.

5.2.4    Measurement tolerance.

The default measurement tolerance shall be ±1% unless otherwise stated.

10

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