MIL-STD-1275E
5.3.3.1.2 Emitted spikes.
The EUT shall be supplied power by a source set to the nominal 28 VDC operating voltage. Unless otherwise specified in the applicable performance specification, use the conducted transient emissions test method specified in SAE J1113-42 to measure the spikes emitted by the EUT using a test setup similar to Figure .
DIGITAL STORAGE OSCILLOSCOPE
POWER SUPPLY
(+)
(·)
5µH LISN
EUT
LOADS
5µH LISN
Figure 10. Sample test setup for exported voltage spikes and surges.
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.
The test operator shall exercise switching function(s) of the EUT capable of producing spikes, (e.g., the switching of any inductive loads controlled by the EUT). If the power source to the EUT is controlled by means of a vehicle mounted switch or relay, the test shall be performed using this switch or relay. Each switching function shall be exercised a minimum of thirty-two (32) times in order to give a reasonable probability that the maximum spike voltage is recorded. The test operator shall monitor the operation of the EUT. Voltage spikes emitted by the EUT shall be within the limits shown in Figure 7. Any voltage spike or combination of voltage spikes emitted from a single event shall have an energy content less than 125 mJ.
5.3.3.2 Voltage surges.
5.3.3.2.1 Injected voltage surges.
The test operator shall inject voltage surges into the EUT using a test setup similar to Figure 11.
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