MIL-STD-1275E
4.2 Electromagnetic compatibility.
Utilization equipment shall be compatible with the applicable performance specification requirements for control of electromagnetic interference and voltage spikes induced by lightning, electromagnetic pulses, and power switching. Electromagnetic interference is not covered by
this standard.
4.3 Electrostatic discharge.
Utilization equipment shall be compatible with the applicable performance specification requirements for immunity to electrostatic discharge. Electrostatic discharge is not covered by this standard.
5 DETAILED REQUIREMENTS
5.1 Voltage compatibility requirements.
This section contains detailed requirements regarding the voltage conditions under which the utilization equipment is expected to operate. Verification of compliance shall be in accordance with Sections 5.2 and 5.3 of this document.
5.1.1 Steady state operation.
This section describes the steady state voltage range, which excludes engine starting disturbances, and applies to all utilization equipment. Utilization equipment shall operate without degradation or damage when subjected to the operational voltage range specified in this section.
5.1.1.1 Operational voltage range.
The utilization equipment voltage operating range is between 20 VDC and 33 VDC, including ripple.
5.1.1.2 Voltage ripple.
The maximum peak-to-peak ripple voltage limits are specified in MIL-STD-461 CS101 with the same values used at 150 kHz extended to 250 kHz, as shown in Figure CS101-1.
5.1.2 Starting operation.
This section applies to utilization equipment operating while subjected to engine starting disturbances. Utilization equipment shall operate without degradation or damage when subjected to engine starting disturbances within the limits shown in Figure 6.
5.1.2.1 Initial engagement surge (IES).
The minimum voltage supplied to utilization equipment during an IES is 12 VDC. The maximum duration of the IES is one (1) second. Consecutive IES events are a minimum of one (1) second apart.
5.1.2.2 Cranking surges.
The minimum voltage supplied to utilization equipment during cranking surges is 16 VDC. The maximum duration of cranking surges is thirty (30) seconds.
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