MIL-DTL-16034B
4.5.17.1 Friction effect. Upon completion of the vibration test, the friction effect shall be determined, as follows:
Untapped ascending and descending reading shall be taken at five points distributed over the scale, using the same
scale points for ascending and descending readings. The difference between corresponding ascending and descending
readings as observed on the standard meter shall be determined (see 3.23.1).
4.5.18 Humidity resistance. Meter readings shall be taken at reference temperature. The meter shall then be place
in a humidity chamber and kept for 6 hours at a temperature of 65 °C with relative humidity of 90 percent. Sufficient
electrical energy shall be supplied to the meter to maintain two-thirds end-scale deflection. At the end of the 6-hour
period, the heat shall be shut off and the meter de-energized. The meter shall then be permitted to cool for 18 hours in
this atmosphere, the relative humidity of which rises as the temperature is reduced. (Precaution shall be taken to
prevent dripping on meter.) A temperature of 35 °C or lower, but not less than 25 °C, shall be attained during the
cooling period. The complete cycle shall then be repeated. Upon completion of the second cycle, the meter shall be
removed from the humidity chamber and permitted to dry for a period of 24 hours at room temperature, with relative
humidity less than 60 percent. Meter readings shall then be taken at reference temperature. The meter window shall
then be removed and the meter, with the window removed, subjected to two additional cycles. The meter shall then be
removed from the humidity chamber and permitted to dry for a period of 24 hours at room temperature, with relative
humidity less than 60 percent. Meter readings shall then be taken at reference temperature. After the drying period, a
maximum of 10 momentary end-scale deflections will be permitted prior to the final reading. Only one meter of the
sample shall be subject to this test (see 3.24).
4.5.19 Shock (high-impact). High-impact, shock-resistant meters shall be tested in accordance with Type C of
MIL-S-901 for lightweight equipment, when mounted on a plate as shown on Figure 6D of that specification. Two
meters of the sample, which were not subjected to the humidity-resistance test, shall be used. During the test, one of
the meters shall be energized to approximately one-half scale deflection. A total of nine blows shall be applied. Three
blows shall be applied parallel to each of the three principal axis of the meters. The blows for each direction shall be
with hammer drop heights of 1 foot, 3 feet, and 5 feet. The pointer shall be reset to zero after each blow. At the
completion of the shock test, the meters shall be checked for calibration errors, then disassembled and carefully
examined for damaged or misalignment of parts (see 3.25).
4.5.20 Visual inspection of windows. Meter dials shall be inspected through the installed window with the
observer's line-of-sight on the centerline axis of the dial, between 18 and 24 inches from the dial. The illumination
source shall be the diffused light from two 60-watt incandescent lamps placed behind and on either side of the
observer, but no more than 3 feet from the meter dial. The sources shall be placed so as to eliminate shadows on the
dial. For transparent windows, placement of light sources should minimize reflected glare. For anti-glare windows,
placement of light sources should maximize reflected glare.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
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