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|  MIL-P-48571(MU)
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 perfor-
mance shall be available
4.6.1.2 Operating temperatures.- The test equipment utilized in this
test shall be in accordance with the "Test Facilities" requirements of
MIL-F-18926 and the conditions of 3.4.2. The periscope shall be placed in
the test chamber and the 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 five hours.
At the completion of this five hour period and while at -400F, the peri-
scope shall be subjected to the tests in 4.6.2 to determine compliance with
the applicable requirements of 3.5, for this temperature (-40F). Upon com-
pletion of this test, the temperature of the test chamber shall be gradually
raised (see above rate of temparature change) to +150F. The periscope
shall remain at this temperature for a period of five hours. At the com-
pletion of the five hour period and while at +150F, the periscope 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 com-
pletion of this test, the temperature of the test chamber shall be gradually
reduced (see above rate of temperature change) to room 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 coupling.- Standard torque measuring equipment
capable of measuring the torque values specified in 3.5.1 shall be utilized
for this test. An appropriate adapter to accommodate the coupling shall be
used with the torque measuring equipment. The running torque required to
rotate the elevation input coupling through its full range of travel in
each direction shall not exceed the value specified in 3.5.1 for the temp-
eratures 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 accom-
modate 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 di-
opter knob shall conform to the applicable requirements of 3.5.2 for the
temperatures indicated.
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