JOTP-053
11 March 2015
(10) Repeat steps 8 through 9 for each adjacent I/O combination.
(11) Repeat steps 1 through 10 for the remaining UUTs.
b. Test Rationale. The objective of this test is to verify that no safety system failures,
faults, or anomalies occur as of a result of I/O pins being shorted at various points during the
mission. This is intended to primarily be proven through analysis with testing to be conducted on
any case that cannot be analyzed.
5.2
Voltage Regulator Tests.
5.2.1 Test Procedure - Under Voltage/Over Voltage (Regulator).
a. The units will be operated with the regulator output voltage varied in 10% increments
between the range of 50% below the lower specified voltage limit and 50% above the upper
specified voltage limit. The voltage level and rationale for selection of the under and over voltage
levels for each voltage source should be specified in the test plan.
(1) Monitor voltages in addition to the test points detailed in the test plan.
(2) For each voltage regulator, the UUT shall be run through a normal operational cycle
with the voltage set to 50% less than the minimum specified voltage of that regulator.
(3) Repeat steps 1 and 2 incrementing the voltage by no more than 10% of the nominal
regulator voltage for each step. The under/over voltage shall, at a minimum, encompass -50% of
the lower specified voltage to +50% of the upper specified voltage.
(4) For overvoltage, it is acceptable to conduct the maximum upper voltage limit test
first, and eliminate the remaining overvoltage tests if that results in a pass.
(5) Repeat above steps for each unit.
b. Test Rationale. The objective of the test is to determine the effect of variations of
voltage at the output of each regulator (due to regulator malfunction or failure) on the operation of
the safety critical electronics. Instruments shall be used to monitor the 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.
5.2.2 Test Procedure - Power Drop-Out (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.
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