MIL-DTL-25867D
4.5.8 Endurance. The gage shall be subjected to an endurance test in accordance with
4.5.7 except that it shall be operated for 60,000 cycles in lieu of 10,000 cycles.
4.5.9 Low-pressure (altitude). The low-pressure (altitude) test shall be conducted in
accordance with MIL-STD-810F, Method 500.4, procedure I, except the temperature shall be
-55 ºC (-67 ºF) with the chamber pressure equivalent to an altitude of 100,000 feet. The rate of
pressure change shall not exceed an average of 3 feet per second while under these conditions. At
the end of a 1-hour period, a scale and friction error test shall be conducted. The errors shall not
exceed the tolerances specified in table II. This test may be conducted concurrently with the low
temperature exposure test.
4.5.10 Low temperature exposure. The low temperature exposure test shall be conducted
in accordance with MIL-STD-810F, Method 502.4, procedure I. The gage shall be exposed to a
temperature of -65 ºC ± 2 ºC (-85 ºF ± 4 ºF) for a minimum of 48 hours after which it shall be
operated throughout its range while at the specified temperature. The temperature shall then be
raised to -54 ºC ± 2 ºC (-65 ºF ± 4 ºF) and the gage maintained at this temperature for 24 hours.
While at -54 ºC ± 2 ºC (-65 ºF ± 4 ºF), the gage shall be subjected to the scale error at room
temperature and friction tests. The tolerances shall be within those specified in table II. The gage
shall be returned to room temperature for a minimum period of 4 hours and then subjected to the
scale error test. The scale errors shall not exceed the tolerances specified in table II for room
temperature.
4.5.11 High temperature exposure. The gage shall be placed in a temperature chamber
and subjected to 200 ºC ± 2 ºC (392 ºF ± 4 ºF) for a period of 24 hours. It shall then be returned
to room temperature for a minimum of 4 hours after which it shall be subjected to the scale error
test at room temperature. The scale error shall not exceed the room temperature tolerances
specified in table II.
4.5.12 Humidity. The gage shall be subjected to a humidity test in accordance with
MIL-STD-810F, Method 507.4, procedure I. External connections to the gage shall be made to
simulate installed conditions. Immediately after completion of this test, the gage shall be
subjected to the scale and friction error test. The scale and friction error shall not exceed the
tolerances specified in table II.
4.5.13 Salt-fog. The gage shall be subjected to a salt-fog test for a period of 48 hours in
accordance with MIL-STD-810F, Method 509.4, procedure I. There shall be no evidence of
external corrosion or deterioration that might affect subsequent operation. The scale errors after
this test shall not exceed the tolerances specified in table II for room temperature scale error.
4.5.14 Fungus. The gage shall be subjected to a fungus test in accordance with
MIL-STD-810F, Method 508.5, procedure I after completion of qualification testing and after the
gage has been subjected to the salt-fog test. The gage shall be disassembled so that the internal
mechanism will be exposed to the fungus spores. At the end of the test period the gage shall be
examined to determine that no fungus growth has occurred.
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