JOTP-053
11 March 2015
(8) Repeat steps 1 through 7 for each unit.
b. Test Rationale. This test shall be conducted to evaluate the electronics' behavior when
exposed to varying rise and fall times of the power source. The objective of the rise time test is to
highlight susceptibilities of the unit safety logic to the rise time of the power source. The objective
of the fall time is to verify that the unit remains safe as supply voltages slowly bleed out of the
system and various circuit components begin to shut down. Steps 5 through 7 are to ensure systems
that may lose power while in an armed state do not inadvertently function. Monitor voltages in
addition to 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.
5.1.4 Test Procedure - Power Drop-Out.
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 drop-out condition at 50% duty cycle to one
of the power sources. 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 one
of the power sources. 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 source.
(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. The units
will be subjected to a 3-cycle drop-out of the each power source 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.
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