JOTP-053
11 March 2015
(4) Repeat steps 2 and 3 with the power source off for periods of 10 and 50 seconds.
For devices that are required to continue without power for longer periods of time, these time
values shall be extended to exceed that time by 25%.
(5) Allow the UUT to begin its functional mission.
(6) Remove one of the power sources for a period of 5 seconds. This removal of power
shall occur after the enabling of the first safety feature (as shown on the UUT event timeline within
the test plan).
(7) Repeat steps 5 and 6 with the power source off for periods of 10 and 50 seconds.
For devices that are required to continue without power for longer periods of time, these time
values shall be extended to exceed that time by 25%.
(8) Repeat steps 1 through 7 for each source supply.
(9) For systems with more than 2 sources, including power on communication bus lines
or test points, additional testing may be required.
(10) Repeat steps 1 through 9 for each unit.
b. Test Rationale. This test shall be conducted to determine the ability of the safety critical
electronics to remain safe after power is cycled. The objective of this test is to verify that no safety
system failures, faults, or anomalies occur due to cycling of power supplies.
5.1.3 Test Procedure - Voltage Rise/Fall Time.
a.
Perform the steps below:
(1) Monitor the test points detailed in the test plan.
(2) Apply all power supplies with a ramp rate of one order of magnitude slower than
nominal.
(3) Apply normal power to the UUT from all supplies.
(4) Allow all supplies to decay from nominal supply voltage to zero voltage over
periods of 1 second and 100 seconds.
(5) For UUTs that have a system requirement for a commanded disarm function, apply
normal power to the UUT from all supplies.
(6) Allow the UUT to arm normally.
(7) Allow all supplies to decay from nominal supply voltage to zero voltage over
periods of 1 second and 100 seconds.
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