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Parallelism of reticle and image
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Elbow Assembly, Passive : 11733401
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Objective focusing range



img
MIL-E-48441A(MU)
assembly shall show no evidence of physical failure subsequent to vibra-
tion. Following the vibration test, the elbow assembly shall meet the
requirements of 3.2, 3.6 through 3.6.4.10 inclusive and 3.6.6 through
3.8 inclusive.
3.6.5.2 Vibration "B". - This requirement shall be met with the
image intensifier tube and reticle projector lamp energized by the
application of +24 6.0 VDC to Contact 11733497 (Reference Drawing
F11733401) Vibration shall be applied along each of three mutually
perpendiclar axes of the elbow assembly. The vibration shall be sinusoidal
as follows:
a. At a frequency of 5 Hertz (Hz), the acceleration shall be
1.0 G (peak).
b. During a frequency sweep of 5 to 500 Hz, maintain constant
acceleration of 1.0 G (peak).
c. During a frequency sweep of 500 to 5 Hz, maintain constant
acceleration of 1.0 G (peak).
d. At 5 Hz, the acceleration shall be 1.0 G (peak).
The frequency of applied vibration shall be sweept logarithmically in 15
minute 1 minute sweep cycles for a total of 15 minute 1 minute along
each of the three mutually perpendicular axes (total vibration time 45
minutes 3 minutes). There shall be no failure or flicker of light
emission from the image intensifier tube nor the reticle projector lamp
during vibration and the elbow assembly shall show no evidence of physical
failure subsequent to vibration. Following the vibratio ntest, the
elbow assembly shall meet the requirements of 3.2, 3.6 through 3.6.4.10
inclusive and 3.6.6 through 3.8 inclusive.
3.6.5.3 Shock. This requirement shall be met with the image
intensifier tube and reticle projector lamp energized by the application
of +24 6.0 VDC to Contact 11733497 (Reference Drawing F11733401). The
elbow assembly shall be subjected to 24 cumulative -shocks consisting of
three each of 100 G's, then 40 G's, applied in each direction along each
of the two mutually perpendicular horizontal axes call four sides). The
elbow assembly shall also be subjected to six cumulative shocks consisting
of three each at 90 G's, then 35 G's applied in one direction along the
vertical axis (normal operating position of elbow assembly only). The
shock pulse shall have a half sine wave. For 100 G's 10% and 90 G's
10% the shock pulse shall have a time duration of 3 .2 mini-seconds;
for 40 G's 10% and 35 G's 10% the shock pulse shall have a time
duration of 18 3 milliseconds. Subsequent to shock, there shall be no
failure or flicker of light emission from the image tube nor the reticle
projector lamp. The elbow assembly shall also show no evidence of
physical failure. Following the shock test the elbow assembly shall
meet the requirements of 3.2, 3.6 through 3.6.4.10 inclusive and 3.6.6
through 3.8 inclusive.
3.6.6 Post-Vibration/Post-Shock collimation.- The original collima-
tion pre-vibration/pre-shock settings established in 3.6.4.1 shall not
deviate more than 0.3 mil (including fixture error) due to vibration/shock,
as observed through the eyepiece.
7

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