MIL-DTL-25446E
4.5.13 Vibration. A vibration test shall be performed in accordance with MIL-STD-810,
method 514, category 8. The temperature transmitter shall be inserted in a test fixture with a
temperature at the bottom of the well of 275 ° ±10 °C (527 ° ±16 °F) and the leads of the
transmitter held by a stationary bracket in such a manner as to prevent pull on the leads during
vibration. The leads shall be secured in such a manner that the angle between the longitudinal
axis of the temperature transmitter and the transmitter leads is a minimum of 100 degrees. The
test fixture used for this test shall be designed to approximate an axial temperature gradient of
37.8 °C. The well of the fixture shall be of the minimum depth (7.0 inches. Upon completion of
the vibration test, the following tests, as specified herein, shall be conducted and the results shall
be within the tolerance specified for the particular test:
a. Spring load: The spring load shall be a minimum of 2.0 pounds.
b. Transmitter resistance test.
4.5.14 Humidity. The temperature transmitter shall be subjected to humidity test,
method 507, procedure I, of MIL-STD-810, except for a period of 5 cycles. There shall be no
evidence of corrosion or other damage of the temperature transmitter. Following the humidity
test, an insulation resistance test shall be conducted and the insulation resistance shall be not less
than one megohm. Air drying of the temperature transmitter assembly prior to conducting the
insulation resistance test is allowed.
4.5.15 Fungus. The temperature transmitter shall be subjected to a fungus test in
accordance with method 508, procedure 1, of MIL-STD-810. There shall be no evidence of
fungus growth on the temperature transmitter as a result of this test. Following the fungus test,
an insulation resistance test shall be conducted and the insulation resistance shall be not less than
one megohm.
4.5.16 Salt fog. The complete temperature transmitter assembly shall be subjected to a
salt fog test in accordance with method 509 of MIL-STD-810 for a period of 50 hours. At the
completion of this test, the transmitter may be cleaned externally with distilled water and air
dried. Following the salt fog test, an insulation resistance test shall be conducted and the
insulation resistance shall be not less than one megohm. The temperature transmitter shall then
be subjected to the transmitter resistance tests. The temperature transmitter resistance shall not
exceed the tolerances specified in table II. There shall be no evidence of corrosion or other
damage as a result of the salt fog test.
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