MIL-PRF-32516
4.5.7 Altitude test, not operating (see 3.11.2). The altitude test shall be performed as
specified in Steps 1 through 4 at the simulated altitude.
a. Step 1. Prepare the test item in accordance with 4.5.2 and maintain the temperature
within the specified operating range for the duration of the test. The equipment shall
be configured in a mode that can easily be accessed for measurement of conformance
to specification. A performance test shall be made at this starting point to determine
conformance to specification for the equipment.
b. Step 2. Decrease the chamber pressure to 15,000 feet at a rate not to exceed 2000
feet per minute with the diagnostic equipment not operating for 1 hour.
c. Step 3. With the diagnostic equipment not operating, return the chamber to
standard ambient conditions at a rate not to exceed 2,000 feet per minute.
d. Step 4. Perform the satisfactory operation test after return to the test conditions of
4.5.3. Degradation of equipment performance beyond the specified requirements
shall constitute a failure.
4.5.8 Fungus resistance (see 3.11.3).
4.5.8.1 Fungus resistance test. The diagnostic equipment shall be tested in accordance
with MIL-STD-810, Test Method 508. The diagnostic equipment shall be removed from the test
chamber and excess moisture may be removed by turning the diagnostic equipment upside down
or by shaking. No washing or wiping of the diagnostic equipment is permitted.
4.5.8.2 Alternative fungus test method. As an alternative, the procuring activity may
specify that the manufacturer provide a certified statement stating that no organic material is
used in the manufacturing of the diagnostic equipment.
4.5.9 Random vibration tests (see 3.11.4). The vibration tests shall be as specified in
4.5.9.1. If a diagnostic equipment failure occurs, the diagnostic equipment may be repaired at
the discretion of the procuring activity. If repair is allowed, testing will continue from the point
at which the failure occurred until the remaining test period is completed. The portion of the test
period prior to the failure will be repeated to evaluate the integrity of the repair. Failure modes
that are not related to the original failure will be disregarded during the retest. At the discretion
of the procuring activity, a second unit maybe subjected to the test in lieu of retesting the unit
that failed.
4.5.9.1 Background information. Vibration levels on Figure 3 shall be applied to the
diagnostic equipment, with durations of 10 minutes per axis. The diagnostic equipment shall be
powered off during the vibration test. The diagnostic equipment is to be hard mounted to the
table by gripping the equipment's structure. Unless the diagnostic equipment's feet are integral
parts of the structure, they should be removed during the test; if they are integral, the diagnostic
equipment should be fixed so that the vibration is applied to the structural frame of the diagnostic
equipment. At the conclusion of the vibration test, conduct a physical evaluation and a
performance test of the diagnostic equipment (see 4.5.2).
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