MIL-DTL-13718F
4.5.14 Transient voltage characteristics test. To determine conformance to 3.4.12, relay
shall be energized at maximum operating voltage. When relay is deenergized, voltage spike
generated shall be measured with an oscilloscope.
4.5.15 Vibration test. To determine conformance to 3.4.13.1, the relay shall withstand
vibration levels for applicable ground mobile vehicles as specified in MIL-STD-810 (method
5.14.4, category 8, test procedure I). One of the principal axes of vibration shall be along the line
of contact movement. During each run, relay shall be energized at its normal resistive load rating
for half of the time. Cycling shall be as specified in 4.5.10. During testing, observations shall be
made for any vibration-induced bounce of relay contacts. At conclusion of test, relay shall be
inspected for evidence of damage. Relay shall then be tested as specified in 4.5.10, except that
length of test shall be 100 cycles.
4.5.16 Waterproofness test. To determine conformance to 3.4.13.2, grade A relays shall
be subjected to the following test methods:
Step 1. The component, with its electrical connections, shall be submerged in a
container with the uppermost surface a minimum of one inch below the
surface of the saline solution and installed in the chamber. The component
shall be carefully observed during its entire period of submersion and shall be
operated while submerged for 30 minutes at full rated current and voltage.
The chamber shall be evacuated to a pressure six lb below atmospheric so as
to apply a minimum of six pounds per square inch (psi) in internal pressure to
all voids within the component. During this period the component shall be
carefully observed for poor seals, as evidenced by bubbles escaping from the
interior of the component. Leakage thus indicated shall be considered as
noncompliance with the waterproofness requirement and the component shall
be rejected. Bubbles which are the result of entrapped air on the exterior
surfaces of the component shall not be considered leak.
Step 2. The chamber shall then be pressurized to six lb above atmospheric and the
component again operated for 30 minutes.
Step 3. Components shall be disassembled as normally required in servicing and
inspection made for the presence of water. If water is present, the
component shall be rejected. If the component is dry, it shall be reassembled
and subjected to 15 hours of dry operation (three 5-hour periods) at full
rated current and voltage. Insulation breakdown or other damage that would
impair mechanical or electrical operation of the component shall be
considered as evidence of failure.
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