MIL-DTL-5790H
4.6.11 Torque. The torque requirement shall be verified by a test designed by the
manufacturer.
4.6.12 Low temperature (non-operational). The transmitter shall be subjected to a
temperature of -85 °F ± 3 ºF for 50 hours. The temperature shall then be raised to -65 °F ± 3 ºF
for 4 hours. The transmitter shall then be returned to room temperature for 4 hours and then
subjected to the scale error and friction error tests. The tolerances shall not exceed those
specified in tables I and II.
4.6.13 High temperature (non-operational). The transmitter shall be subjected to a
temperature of 293 °F ± 18 ºF for 80 hours. The transmitter shall then be returned to room
temperature for 4 hours and then subjected to the scale error and friction error tests. The
tolerances shall not exceed those specified in tables I and II.
4.6.14 Pressure-altitude. The transmitter shall be subjected to a pressure altitude test with
an absolute internal chamber pressure of 0.64 ± 0.1 inch Hg (85,000 ± 3,000 feet). The transmitter
vent shall be held at the prevailing atmospheric pressure. The transmitter shall then be subjected
to the scale error test for upscale pressure only.
4.6.15 Electromagnetic interference. The transmitter shall be subjected to and shall meet
the electromagnetic interference tests CE102, CS101, CS114, CS115, CS116, RE102, and RS103
of MIL-STD-461 for Air Force aircraft.
4.6.16 Overpressure. The transmitter shall be subjected to a pressure of 400 psi for a
period of 10 minutes. The transmitter shall be tested not less than 1 hour following the
overpressure test for scale error as specified under individual tests on increasing pressure only.
The scale error shall not exceed the tolerance specified in table I.
4.6.17 Salt fog. The transmitter shall be subjected to the humidity test in ASTM B 117.
The transmitter shall be examined, and there shall be no evidence of external corrosion or
deterioration. The transmitter shall then be subjected to the dielectric strength test. The impedance
between the case and each pin shall be measured and shall be a minimum of 20 megohms. The
external surface of the transmitter may be washed with distilled water and air dried prior to its
subjection to the dielectric strength test.
4.6.18 Damping. A pressure sufficient to produce full-scale pointer deflection shall be
applied to the transmitter. A quick release valve shall be used to exhaust the pressure. The time
required for the pointer to traverse the interval from 200 psi to 20 psi shall be 9 ± 3 seconds. The
test shall be conducted with lubricating oil with a viscosity of approximately 2,500 centistokes,
such as grade 1005 oil at -65 ºF, or equivalent.
4.6.19 Seasoning. The transmitter shall be subjected to 10,000 pressure cycles that produce
a movement of the MIL-I-7087 indicator from 0 to 85 ± 5 percent of full scale and return to 0 at a
rate of 30 ± 10 cpm. One hour after completion of this test, the transmitter shall be subjected to the
scale error test at room temperature and shall meet the tolerances specified in tables I and II.
13
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business