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

5.2.8  Power supply.................................................................................................................. 11

5.3      Voltage compatibility verification method. ................................................................... 11

5.3.1  Steady state operation. ................................................................................................... 11

5.3.2  Starting operation........................................................................................................... 12

5.3.3  Transient disturbances. .................................................................................................. 12

5.3.4  Reverse polarity. ............................................................................................................ 15

5.3.5  Electromagnetic compatibility. ...................................................................................... 15

5.3.6  Electrostatic discharge. .................................................................................................. 15

6        NOTES........................................................................................................................... 15

6.1      Intended use.................................................................................................................... 15

6.2      Acronyms. ...................................................................................................................... 15

6.3      International interest....................................................................................................... 16

6.4      Changes from previous issue.......................................................................................... 16

6.5      Subject term (key word) listing...................................................................................... 16

Table of Figures

Figure 1.  Recovery time................................................................................................................. 3

Figure 2.  Sample starting disturbance waveform. ......................................................................... 4

Figure 3.  Voltage spike.................................................................................................................. 4

Figure 4.  Sample alternator load dump waveform......................................................................... 5

Figure 5.  Sample intermittent contact waveform........................................................................... 6

Figure 6.  Starting disturbance limits on 28VDC systems.............................................................. 8

Figure 7.  Envelope of spikes for 28VDC systems......................................................................... 9

Figure 8.  Envelope of surges for 28VDC systems....................................................................... 10

Figure 9.  Sample test setup for immunity to injected voltage spikes. ......................................... 12

Figure 10.  Sample test setup for exported voltage spikes and surges.......................................... 13

Figure 11.  Sample test circuit for immunity to injected voltage surges. ..................................... 14

Table of Tables

Table I.  Positive voltage surge test parameters............................................................................ 14

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