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|  MIL-S-70442
(AR)
APPENDIX
B
BURN IN REQUIREMENTS
Burn in is to be applied to all deliverable systems or LRU'S.
Test Environments
Environmental exposure for the HUDS during burn in is Level F of
MIL-STD-781B. Cycle time shall be determined by thermal survey.
Chamber temperature change shall be programmed equal to or greater
o
than 5 C per minute. Figure 18 illustrates one cycle of the
environmental profile described below.
0
0
-54C to +71C (-65 F to 160 F)
Temperature
Temperature cycling shall be time
Temperature Cycling
to stabilize at low temperature
followed by time to stabilize at
the high temperature, plus 2
hours.
2.2G + 10% peak acceleration
Vibration
value at 30 + 5 Hz measured at
the mounting points. The dura-
tion of vibration shall be at
least 10 minutes during each
hour of equipment operating time.
Equipment off during cooling
Equipment On-Off
Cycling
cycle and on during heating
cycle.
Specified voltage +5 -2%.
Input Voltage
A. Nominal voltage for first 1/2
Input Voltage Cycling
of "ON" time starting at the
beginning of the heating period.
NOTE : Voltage Cycling
will occur on the primary
Momentary off.
B.
c.
HUDS
power
(28VDC)
only.
100% of nominal for next 1/3
of "ON" time.
D.
Momentary off.
90% of nominal for last 1/3
E.
of "ON" time.
69
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