JOTP-053
11 March 2015
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 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 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 ground source.
(7) Repeat steps 1 through 6 for the remaining UUTs.
b. Test Rationale. The objective of the loss of ground test is to determine if any safety
system failures, faults, or anomalies occur as a result of the ground connections being removed
from the unit prior to arming.
5.1.8 Test Procedure - Shorting of I/O.
a. An analysis with the equivalent rigor of a "bent pin" analysis shall be conducted giving
consideration to the pins in the input connector. This analysis shall address shorts occurring both
prior to, and after application of power, and after the enabling of the first safety feature. Testing
shall be conducted for any case which cannot be determined via analysis.
(1) Monitor the test points detailed in the test plan.
(2) Short two adjacent pins within the UUT's electrical I/O connector prior to applying
power.
(3) Power up and allow the UUT to perform its functional mission.
(4) Repeat steps 2 through 3 for each adjacent I/O combination.
(5) Allow the UUT to begin its functional mission.
(6) Short two adjacent pins within the UUT's electrical I/O connector after applying
power. This shorted condition shall occur before the enabling of any safety features (as shown on
the UUT event timeline within the test plan).
(7) Repeat steps 5 through 6 for each adjacent I/O combination.
(8) Allow the UUT to begin its functional mission.
(9) Short two adjacent pins within the UUT's electrical I/O connector after the enabling
of the first safety feature (as shown on the UUT event timeline within the test plan).
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