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|  MIL-Q-48555A(AR)
3. 6.3 Shock. The quadrant shall withstand a total of 18 shock
impulses, 3 in each direction of 3 mutually perpendicular axes.
Each shock impulse shall be a half-sine wave-with a time duration of
6 -- 1 milliseconds. The peak amplitude of each shock impulse shall
+
be 75 g's. Subsequent to shock, the telescope shall show no evidence
of physical damage and shall meet the requirements of 3.7 through
3.15.
3.6.4 Vibration "A".
Where required, the quadrant shall
withstand a total of 270 minutes -- 5 minutes of sweep-cycle
+
vibration.
The vibration shall be applied for 90 minutes + 2
minutes along each of the three mutually perpendicular major axes.
A complete sweep-cycle shall consist of vibration from origin (5 hz
at 1 inch double amplitude) to mid-point (5 g's + 0.5 g's at 500 hz)
to origin, and shall have a duration of 15 minutes + 1 minute.
Double amplitude shall be constant at 1 inch between 5 hz and 10 hz,
and varied with frequency to maintain a constant 5 g's + 0.5 g's
acceleration between 10 hz and 500 hz. Upon completion of
vibration, the quadrant shall exhibit no evidence of damage and
shall meet the requirements of 3.7 through 3.15.
The quadrant shall be vibrated in a
3.6.5 Vibration.--"B".
.
vertical plane at a constant frequency of 30 + 5 cycles per second
with an amplitude of 1/16 inch (1/8 + 1/64 inch total excursion) for
a period of five minutes + 15 seconds. Subsequent to vibration,
there shall be no evidence of physical failure and the quadrant
shall meet the requirements of 3.7 through 3.15.
Sealing and purging.
3.7
I
3.7.1 Sealing.
The quadrant shall show no evidence of leakage
when subjected to an internal pressure of 5 + 0.10 pound per square
inch gage (psig) for a minimum of one hour.
The interior of the quadrant shall be purged
3.7.2 P u r q i n g .
with dry nitrogen supplied at a pressure of 8 + 1/4 o psig until the
Purging
dew point of the emergent gas is no higher than -25 F.
apparatus shall be removed, and subsequent to the seating of the
pressure relief valve tbe quadrant shall be pressured tc) 1.0 + 0.1
psig for all testing and delivery.
3.8.1 Defects. There shall be no evidence of dirt, moisture,
finger prints, condensates, or fractures on glass windows or
Internal inspection shall be made by viewing through the
counters.
windows.
4
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