MIL-DTL-62741A(AT)
4.2.6.5 Burn-in. When required (see 6.2), the burn-in shall consist of three temperature
cycles and a six gravity unit (g) root mean square (rms) random vibration as follows:
a. Temperature cycle. Each temperature cycle shall consist of 30 minutes at minus
(-) 60°F (-51°C) and 30 minutes at plus (+) 125°F (52°C). The rate of
temperature change between temperature extremes shall be not less than 5°F
(2.8°C) per minute. Power shall be applied to the PWA for not less than
30 minutes from 20°F (7°C) through the completion of each high-temperature
soak.
b. Random vibration. Following all temperature cycling, the PWA shall be hard
mounted to the vibration table so that the axis of vibration is perpendicular to the
plane of the PWA. The vibration shall be at room ambient temperature, for a
period of 10 minutes, as shown in figure 12.
NOTE: PWAs which will be procured for simultaneous installation in VTMs being procured do
not have to be subjected to "burn-in" provided the VTMs are subjected to the 16-hour "power
on" burn-in.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When actual packaging of materiel is to be performed by DoD
personnel, these personnel need to contact the responsible packaging activity to ascertain requisite
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activity within the Military Department or Defense Agency , or within the Military
Department's System Command. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory.)
6.1 Intended use. The PWA multiplexes nineteen 5 V channels, one 15 V channel, eleven
35 V channels, and one 50 V channel to a single high- impedance instrumentation amplifier. A
summing amplifier allows an offset to be subtracted from the output of the instrumentation
amplifier. Gains of 1, 10, 30, and 60 along with 2-pole low-pass filter frequencies of 6, 60, 600,
and 6000 Hz are software selectable. A 12-bit ADCON (analog to digital converter) with a + 5 V
signal range can convert an analog input to a digital output every 25 microseconds. The PWA is
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