MIL-DTL-62420B(AT)
TABLE II. Hot climatic temperature test.
°F (°C)
°F (°C)
Time
Time
0100
95 (35)
1300
156 (69)
0200
94 (34)
1400
158 (70)
0300
94
1500
160 (70)
0400
92 (33)
1600
158
0500
92
1700
153 (68)
0600
91 (33)
1800
145
0700
97 (36)
1900
131 (55)
0800
104 (40)
2000
118 (48)
0900
111 (44)
2100
105 (41)
1000
124 (51)
2200
103 (39)
1100
133 (56)
2300
99 (37)
1200
145 (63)
2400
95
3.7.1.3 Mirror and window lamination. The unit shall show no evidence of bond failure
when subjected to the temperatures specified in 3.7.1.1 and 3.7.1.2.
3.7.2 Humidity. The periscope shall exhibit no indication of moisture buildup, bond
separation, or other forms of image degradation when exposed to two 24 hour cycles of humidity
test with 50% maximum relative humidity. Prior to the test, the unit shall be conditioned at
100°F (38°C) and after the test at 73°F (°C). Subsequently the periscope shall meet the
requirements for 3.4.1.1, 3.4.1.4, 3.4.1.5, and 3.7.6.
3.7.3 Salt fog. The periscope shall meet the requirements for 3.4.1.1, 3.4.1.4, 3.4.1.5,
and 3.7.6 after exposure to the salt fog test specified in MIL-STD-810 or equivalent.
3.7.4 Vibration. The periscope shall be subjected to sinusoidal vibration along each axis.
The sinusoidal cycling time shall be a total of 3 hours in each of three perpendicular axes at an
ambient temperature of 140°F. Subsequently the periscope shall meet the requirements for
3.4.1.1, 3.4.1.4, 3.4.1.5 and 3.7.6.
3.7.5 Shock.
3.7.5.1 Basic shock. The periscope shall meet the requirements for 3.4.1.1, 3.4.1.4,
3.4.1.5, and 3.7.6, after exposure to the basic shock test that incurs a total of 18 shocks in each
direction shall be applied along three mutually perpendicular axes of the periscope.
3.7.5.2 Gun fire shock. The periscope shall meet the requirements for 3.4.1.1, 3.4.1.4,
3.4.1.5, and 3.7.6, after exposure to the gun firing shock test total of 18 shocks in each direction
shall be applied along three mutually perpendicular axes of the periscope.
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