JOTP-053
11 March 2015
(3) Apply 3 consecutive cycles of a 50 ms drop-out condition at 50% duty cycle to the
output of the regulator. If the program has a specified requirement for susceptibility to a voltage
drop-out, that time shall be used in lieu of 50 ms. This drop-out of power shall occur before the
enabling of any safety features (as shown on the UUT event timeline within the test plan).
(4) Allow the UUT to begin its functional mission.
(5) Apply 3 consecutive cycles of a 50 ms drop-out condition at 50% duty cycle to the
output of the regulator. If the program has a specified requirement for susceptibility to a voltage
drop-out, that time shall be used in lieu of 50 ms. This drop-out of power shall occur after the
enabling of the first safety feature (as shown on the UUT event timeline within the test plan).
(6) Repeat steps 2 through 5 for each voltage regulator.
(7) Repeat steps 1 through 6 for the remaining UUTs.
b. Test Rationale. This test shall be conducted to determine the ability of the safety critical
electronics to remain safe or continue normal operation during a transient power loss at the output
of each regulator. The units will be subjected to a 3-cycle drop-out of each voltage regulator at
the times specified in the test plan. Monitor the test points detailed in the test plan to verify that
no safety system failures, faults, or anomalies occur during the conduct of this test.
5.2.3 Test Procedure - Transient Loss of Ground (Regulator).
a.
Perform the steps below:
(1) Monitor the test points detailed in the test plan.
(2) Allow the UUT to begin its functional mission.
(3) Apply 3 consecutive cycles of a 50 ms loss of ground condition at 50% duty cycle
to one of the regulator ground sources. If the program has a specified requirement for susceptibility
to a ground drop-out, that time shall be used in lieu of 50 ms. This drop-out of ground shall occur
before the enabling of any safety features (as shown on the UUT event timeline within the test
plan).
(4) Allow the UUT to begin its functional mission.
(5) Apply 3 consecutive cycles of a 50 ms loss of ground condition at 50% duty cycle
to one of the regulator ground sources. If the program has a specified requirement for susceptibility
to a ground drop-out, that time shall be used in lieu of 50ms. This drop-out of ground shall occur
after the enabling of the first safety feature (as shown on the UUT event timeline within the test
plan).
(6) Repeat steps 2 through 5 for each regulator's ground source.
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