MIL-PRF-49040F
3.5.2
MX-9644/UV Image intensifier assembly operational and
environmental requirements. The assembly shall operate in conjunction with a
nominal 50 thousand ohm gain control switch, and a 470 thousand ohm resistor
in accordance with Figure 1. The minimum manual gain setting shall be
obtained with the switch (Sl) closed, and the wiper rotated CCW to position 1.
The maximum manual gain setting shall be obtained with the switch (Sl) closed
and the wiper rotated CW to position 3. The voltage source for operating the
assembly shall be from a BA-3058/U battery conforming to ANSI C18.1,
Specification Sheet 20-0571-1988, BA-5567/U battery conforming to MIL-PRF-
49471/4 or a power source with an input of 2.0 to 3.0 volts direct current
(dc).
3.5.2.1 Photocathode sensitivity. The photocathode sensitivity shall
be not less than the following values for the conditions specified.
a.
Luminous sensitivity of 260 microamperes (uA) per lumen for 2856
Kelvin (K) radiation.
b.
Radiant sensitivity of 0.015 ampere per watt at 0.80 micrometer.
c.
Radiant sensitivity of 0.010 ampere per watt at 0.85 micrometer.
3.5.2.2 Burn-in, environmental stress screening (ESS). The assembly
shall undergo cyclic operation (burn-in) of not less than 120 continuous 12
minute cycles. Each cycle of operation shall have a profile as specified in
Figure 2. At the end of this cyclic operation there shall not be evidence of
damage (see 3.5.3.1). Burn-in shall be performed with operating voltage
applied. The photocathode shall be illuminated at least once during each 12
minute cycle with 1 to 5 X 10-3 foot-candles for not less than 3 seconds and 5
to 10 foot-candles for not less than 5 seconds.
3.5.2.3 Vibration. With the operating potential applied, the assembly
shall not be damaged, (see 3.5.3.1) after being rigidly mounted, singly or in
groups, and subjected to a 2.5 g's (see 3.5.3.3) peak sine wave vibration over
a frequency range of 10 hertz (Hz) through 3500 Hz and return to 10 Hz. in a
logarithmic sweep within 30 minutes along both the parallel and perpendicular
axes of the assembly. The sweep shall be performed 2 times in each axis.
3.5.2.4
Mechanical shock.
3.5.2.4.1 Mechanical shock I. With the operating potential applied,
the assembly shall not be damaged (see 3.5.3.1) when subjected to 6 shock
impacts applied parallel to the optical axes and 6 shock impacts applied
perpendicular to the optical axis of the assembly. The shock impacts shall be
nominal half sine wave pulse having a minimum of 500 g's (see 3.5.3.3) peak
value and a duration of 0.3 milliseconds, ± 0.05 milliseconds measured between
the 10 percent values of the peak amplitude.
3.5.2.4.2 Mechanical shock II. The assembly shall not be damaged (see
3.5.3.1) when subjected to 6 mechanical shock pulses along the perpendicular
axis and 6 mechanical shock pulses along the parallel axis at an amplitude of
140 g's, ± 10 g's (see 3.5.3.3) half-sine wave peak for 9 milliseconds, ± 10
percent duration.
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