MIL-DTL-25867D
4.5 Test methods.
4.5.1 Examination of product. Each gage shall be inspected to determine compliance
with the requirements specified herein with respect to materials, markings, dimensions, and
workmanship.
4.5.2 Scale and friction error. The gage shall be tested for scale error at ambient
temperature at the test points specified in table II. The gage shall be lightly tapped or vibrated
before each reading to remove normal friction. The difference between the readings before and
after the gage is tapped or vibrated shall constitute friction error. The scale and friction errors
shall not exceed the tolerances specified in table II. This test shall be conducted both up-scale
and down-scale at the specified test points.
4.5.3 Position error. The gage shall be pressurized to obtain a scale reading of
approximately one-half scale. The maximum change in indication produced by rotating the gage
from the normal operating position to a position 90 degrees both clockwise and counterclockwise
(longitudinal axis vertical) shall not exceed the position error tolerance specified in table II.
4.5.4 Vibration. The gage shall be subjected to a vibration test in accordance with
MIL-STD-810F, Method 514.5, procedure I, equipment categories 13 and 22. An indication of
approximately mid-scale shall be maintained on the gage during this test. At the conclusion of
this test, the gage shall be subjected to the scale and friction error test. The errors shall not
exceed the tolerances specified in table II. No damage to the gage shall result from this test.
4.5.5 Low temperature. The gage shall be subjected to a low temperature test in
accordance with MIL-STD-810F, Method 502.4, procedure I, at -54 ºC ± 2 ºC (-65 ºF ± 4 ºF) for
a period of 4 hours. During this test, an indication of approximately mid-scale shall be
maintained on the gage. At the end of this period and while still at the specified temperature, the
gage shall be subjected to the scale and friction error test. The errors shall not exceed the
tolerances specified in table II.
4.5.6 High temperature. The gage shall be subjected to a high temperature test in
accordance with MIL-STD-810F, Method 501.4, procedure I, at 100 ºC ± 2 ºC (212 ºF ± 4 ºF) for
a period of 6 hours. During this test an indication of approximately mid-scale shall be maintained
on the gage. At the end of the 6-hour period and while still at the specified temperature, the gage
shall be subjected to the scale and friction error test. The tolerances shall not exceed those
specified in table II.
4.5.7 Seasoning. The gage shall be operated for 10,000 cycles at a rate of 30 cycles ±
10 cycles per minute (cpm) from zero indication to 80 percent ± 5 percent of full scale and back
to zero indication. Within one hour after the conclusion of this test, the gage shall be subjected to
the scale error test. The scale errors shall not exceed the tolerances specified in table II. The
gage shall then be examined to determine that no undue wear has occurred.
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