MIL-STD-1275E
5.3.2 Starting operation.
When applicable, the EUT shall be tested to operate as specified while subjected to the voltages/durations of the lower limit of the voltage envelope shown in Figure 6. Any deviation from normal operation shall be recognized as a failure of the EUT.
5.3.3 Transient disturbances.
5.3.3.1 Voltage spikes.
5.3.3.1.1 Injected voltage spikes.
The EUT shall be supplied power by a voltage source set to the nominal 28 VDC operating voltage through a Line Impedance Stabilization Network (LISN). The test operator shall inject voltage spikes into the EUT using a test setup similar to Figure 9.
TRANSIENT GENERATOR
POWER SUPPLY
(+)
(·)
5µH LISN
EUT
LOADS
5µH LISN
Figure 9. Sample test setup for immunity to injected voltage spikes.
One LISN shall be used when the power return is the vehicle chassis; in this case the ground plane provides the power return current path. Two LISNs shall be used when the EUT has a dedicated power return conductor, such as wires, buss bar, etc. This simulates the additional vehicle wiring harness present in the vehicle.
Both positive and negative voltage spikes shall be applied to the EUT. A minimum of fifty (50)
250V spikes of each polarity shall be applied at one (1) second intervals. Each test spike shall have a peak amplitude of 250V, a risetime not exceeding 50 ns, a frequency of oscillation greater than 100 kHz and less than 500 kHz, and a maximum energy content of 2 Joules.
Verify the EUT operates as specified while subjected to the voltage spikes. Any deviation from normal operation shall be recognized as a failure of the EUT.
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