MIL-F-48673 (AR)
APPENDIX B
BURY-IN REQUIREMeNTS
50.
Burn-in is to be applied to all deliverable
50.1 Burn-in.
systems .
50.2 Test environments. Environmental exposure for the FCC-FTS
during burn-in is Level F of MIL-STD-781. Cycle time shall be
determined by thermal survey. Chamber temperature change shall be
programmed equal to or greater than 5° per minute. Figure 3
illustrates one cycle of the environmental profile described below.
0
0
0
0
-54 C to +71 C (-65 F to 160 F)
Temperature
Temperature cycling shall be time to
Temperature Cycling
stabilize at low temperature followed
by
time to stabilize at the high
temperature, plus 2 hours.
2.2G + 10% peak acceleration value at 30
Vibration
+ 5 Hz-measured at the mounting points.
The duration of vibration shall be at
least 10 minutes during each hour of
equipment operation time.
q
Equipment off during cooling cycle and on
Equipment On-Off Cycling
during heating cycle.
Specified voltage +5 -2%.
Input Voltage
a. Nominal voltage for first 1/2 of "ON"
Input Voltage Cycling
time starting at the beginning of the
heating period.
Momentary off.
b.
100% of nominal for next 1/3 of "ON"
c.
time.
Momentary off.
d.
90% of nominal for next 1/3 of "ON"
e.
time.
50.3 Number of Cycles.
50.3.1 Minimum number. The minimum number of cycles shall be
five (5) with the last two (2) cycles failure free.
)
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