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|  MIL-P-48451A (MU)
4.6.1.2 Operating temperature.- The test equipment utilized in this
test shall be in accordance with the "Test Facilities" requirements of
MIL-F-13926 and the conditions of 3.4.2. The periscope shall be placed
in the test chamber and the temperature of the chamber reduced gradually_
(rate of temperature change in the test chamber shall not exceed 20 de-
grees per hour throughout the temperature cycling test) to -40F. The
periscope shall remain at this temperature for a minimum-of Ofive hours.
At the completion of this five hour period and while at -40 F, the
periscope shall be subjected to the tests in 4.6.2. to determine compliance
O
with the applicable requirements of 3.5, for this temperature. (-40 F)
upon completion of this test, temperature of the chamber shall
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be gradually raised (see above rate of temperature change) to +150 F.
The periscope shall remain at this temperature for a period of O five hours.
At the completion of, the five hour period and while at +150 F,the peri-
scope shall again be subjected to the tests in 4.6.2 to determine compliance
with the applicable requirements of 3.5, for this temperature (+150F).
Upon-completion of this test, the temperature of the test chambers shall.
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be gradually reduced (see above-rate of temperature change) to robin
ambient temperature (+60 to +90F) and the periscope removed from the
test chamber.
NOTE:
Temperature testing of each head, daylight body and passive elbow
assembly is not required when the complete periscope is subjected
to temperature. cycling (see 3.1). A record of all data necessary,
to determine compliance with required performance shall be available
4.6.2. Operability.
4.6.2.1 Elevation input shaft.- Standard torque measuring equipment
capable of measuring the torque values specified in 3.5.1 shall be utilized
for this test. An adapter conforming to Drawing C8591108 shall be affixed
to the elevation input shaft. The running torque required to rotate the
elevation input shaft through its full range of travel in each direction
shall not exceed the value specified in 3.5.1 for the temperatures
indicated.
4.6.2.2 Diopter movement - Daylight and Passive.- Standard torque
measuring equipment capable of measuring the torque values specified in
3.5.2 shall be utilized for this test. "An appropriate adapter, to"
accommodate the diopter knob shall be used with the torque measuring
equipment. Torque shall be measured while rotating the diopter movement
through the range specified in 3.5.2. The running torque required to
rotate the diopter knob shall conform to the applicable requirements of .
3.5.2 for the temperatures indicated.
4.6.2.3 Focusing mechanism - Passive.- Standard torque measuring
equipment capable of measuring the torque values specified in 3.5.3
shall be utilized for this test. An appropriate adapter, to accommodate
Ring 11733436 shall be used with the torque measuring equipment. Torque
shall be measured while rotating the ring through the range specified in
3.5.3. The running torque required to rotate Ring 11733436 shall conform
to the applicable requirements of 3.5.3 for the temperatures indicated.
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