MIL-PRF-49052G
3.6.2 Burn-in (ESS). The assembly shall undergo 50 continuous cycles. Each
cycle shall consist of 55 minutes of operating time and 5 minutes of off-time.
Once during each operating cycle the photocathode shall be illuminated with 5 x
10-4 foot-candle (fc) for 5 seconds and with 5 fc for 3 seconds. The remaining
portion of the operating cycle shall be without photocathode illumination. The
brightness gain setting shall not be changed during, or subsequent to, burn-in.
3.6.3 Vibration. The assembly, with no operating voltage applied, shall not
be damaged (see 3.12.9) or suffer degradation of performance (see 3.12.22) after
being subjected to simple harmonic motion parallel to and perpendicular to the
optical axis over a frequency range of 5 hertz (Hz) to 55 Hz with an amplitude of
not less than 0.100 inch total excursion for a period of 10 minutes in each
plane.
3.6.4 Shock. The operating assembly, with no radiation incident on the
photocathode, shall not be damaged (see 3.12.9) and there shall be no evidence of
arcing, flashing, flickering, corona, bright spots, or other intermittent or
continuous failure when subjected to 6 shock impacts parallel to the optical axis
and 6 shock impacts perpendicular to the optical axis. The shock impacts shall
be half sine wave with a minimum peak amplitude of 75 g (see 3.12.5) and a
duration of 6 milliseconds (ms) ± 2 measured at the 10 percent amplitude points.
3.6.5 Temperature (extreme). The assembly shall not be damaged (see 3.12.9)
by storage, operation, or the thermal shock temperature profile specified and
shall meet the following requirements at the temperature specified. Test
profiles shall be as follows:
+65°C for 2 hours.
a.
High temperature storage:
+45°C for 1 hour.
b.
High operating temperature:
1.
Input current shall not be greater than 20 mA.
Gain at 2 x 10-6 fc shall not be less than 3,000 and shall not
2.
be greater than 15,000.
Gain at 2 x 10-4 fc shall not be less than 1,500 and shall not
3.
be greater than 4,500.
4.
Output brightness fluctuation shall be tested at 2.2 Vdc and 2.7
to 3.0 Vdc at 2 x 10-4 fc and 1 fc for first article test (FAT).
Conformance inspection testing shall be 2.0 Vdc and 1 fc only.
The output brightness fluctuation shall not be greater than ±10
percent from a steady state condition and drift shall not be
greater than ±15 percent from a steady state condition for a
period of 2 minutes after an initial 2 seconds of operating
time. All fluctuations shall be random after the initial 2
seconds.
If random fluctuations greater than ±10 percent, but less than
5.
±15 percent, occur in the original 2 minute time period, the
test shall be continued an additional 2 minutes during which the
requirements of 3.6.5 b(4) shall be met.
If the output brightness drift is greater than ±15 percent
6.
during the original 2 minutes time period, the test shall be
continued an additional 2 minutes during which the requirements
of 3.6.5 b(4) shall be met.
5
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