JOTP-053
11 March 2015
5.
PROCEDURES.
The procedures listed herein are designed to electrically stress the safety features of the UUT.
Where applicable, it is required to conduct a functional test of the UUT under nominal conditions
to ensure that correct operation is validated before applying electrically stressing conditions.
5.1 ESAD, ISD, HEO, and FUZES Top Assembly Tests.
5.1.1 Test Procedure - Under Voltage/Over Voltage.
a. The units will be operated with the input 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 source supply, the UUT shall be run through a normal operational cycle
with the supply voltage set to 50% less than the minimum specified voltage of that supply.
(3) Repeat steps 1 and 2 incrementing the voltage by no more than 10% of the nominal
supply voltage for each step. The under/over voltage shall, at a minimum, encompass -50% of the
lower specified supply voltage to +50% of the upper specified supply 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 source
supply voltage 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.
5.1.2 Test Procedure - Power Cycling.
a.
Perform the steps below:
(1) Monitor voltages and the test points detailed in the test plan.
(2) Allow the UUT to begin its functional mission.
(3) Remove one of the power sources for a period of 5 seconds. This removal of power
shall occur before the enabling of any safety features (as shown on the UUT event timeline within
the test plan).
5
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