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MIL-PRF-49080 Power Supplies, Pp-2953\(\)/U And Pp-6224\(\)/UThis specification establishes the performance and verification requirements for each of the following Power Supplies: the PP-2953\(\)/U and the PP-6224\(\)/U . The power supply furnishes 0-25 amperes over a voltage range of 24 to 32VDC from nominal 115/230 VAC at 50, 60 or 400 Hz single phase. The power supply can also operate from a 24 VDC storage battery in the battery standby mode.

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MIL-PRF-49080D
4.10.2
Random failure period.
a)
Place the test items in a test chamber capable of maintaining 149 ± 2°F (65 ±
1.1°C), and connect the test items for the variety of input and output conditions
specified in step c) below, with sensors for input and output voltage and current.
b)
Set the chamber to 149 ± 2°F (65 ± 1.1°C), once the test temperature is
reached, allow the test items to stabilize for not less than four hours.
c)
Load the test items in a continual sequence as follows at the same test
conditions for a total of not less than four hours:
Input Voltage (AC)
Input Frequency
Load
Time
103.5, +5, -0 volts
47.5, +5, -0 Hz
No less than 25 amps
75 minutes
126.5, +0, -5 volts
63, +0, -5 Hz
No less than 20 amps
30 minutes
207, +5, -0 volts
47.5, +5, -0 Hz
No less than 25 amps
75 minutes
253, +0, -5 volts
63, +0, -5 Hz
No less than 20 amps
30 minutes
115, ± 2.5 volts
420, +0, -5 Hz
No less than 25 amps
30 minutes
d)
While at the same test conditions, allow the test items to rest at no-load
conditions for not less than two hours.
e)
Repeat steps c) and d) continuously until a total test time of not less than 883.4
hours is obtained (441.7 hours per each of the 2 units on test).
f)
Once the required test hours have been obtained, allow test items to return to
room ambient conditions and stabilize for not less than two hours.
g)
Conduct the tests of 4.5.1.2 and 4.7.
5
PACKAGING
Packaging. For acquisition purposes, the packaging requirements shall be as
5.1
specified in the contract or order (see 6.2). When packaging of materiel is to be performed by DOD
or in-house contractor 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 activities within the Military Service or Defense Agency, or
within the military service's system commands. 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.
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