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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12

MIL-PRF-49080D

4.5.6

Remote sensing. With the power supply adjusted for remote sensing, the load shall

be connected through a 25 foot cable, 4 conductor #12 wire size (2 conductors for sensing). While

in this configuration, the output voltage shall be measured at the load and shall meet the output

voltage requirements of 3.7.3 when tested as specified in 4.5.1. During this test there shall be no

evidence of unstable operation (see 3.7.8).

4.5.7

Efficiency. The overall efficiency of the power supply shall be measured under

conditions of full load, 28.0 volts at 25 amperes, and at an input of 115 volts RMS, and at

frequencies of 50, 60 and 400 Hz. The percent efficiency shall be determined by the following and

shall meet the requirements of 3.6.6:

Powerout

� 100 = efficiency

Powerin

4.5.8

Stability. The power supply shall be operated from 115 volt, 60 Hz source with a

25 ampere load at nominal output voltage at room temperature.

Method 1: The output shall be monitored continuously for not less than 2

hours. The power supply shall meet the requirements of 3.7.9.

Method 2: The output shall be monitored continuously for not less than 24

hours. Repeat this test using an input of 115 VAC, 400 Hz. The power supply shall meet the

requirements of 3.7.9.

4.5.9

Temperature coefficient. The power supply shall operate from 115 volt, 60 Hz

source with a 25 ampere load at nominal output for 4 hours in an ambient temperature of 70�F

(21.1�C). The ambient temperature shall then be increased to 120�F (49�C) and the power supply

operated for 4 hours. Repeat this test at an ambient temperature starting at -40�F (-40�C) and

increasing to +10�F (-12.2�C). The power supply shall meet the requirements of 3.7.10.

Over voltage. With the AC input adjusted to 115 VAC 60 Hz, adjust the DC output

4.5.10

to 28 VDC with a 25 ampere load. In no greater than two (2) seconds, raise the input voltage to 139

VAC. Maintain this voltage for no less than one (1) minute and then reduce it back to 115 VAC.

Repeat the test using 230 VAC, 60 HZ, raised to 278 VAC. At the end of the test, the power supply

shall be tested per 4.5.1 and 4.5.2 and meet the requirements of 3.7.1, 3.7.3, 3.7.4 and 3.7.6.1.

4.5.11

Electrostatic discharge protection. The power supply shall continue to operate

properly after subjection to IEC 61000-4-2, Level 4, to include direct contact discharge to the

contacts of each DC output connector. The unit shall be tested operating and non-operating with all

switches in the on position. Operation shall be deemed proper by applying a known load to the

power supply before and after the test. The current shall be within 5% of its initial value after the

test. At the end of the test, the power supply shall conform to the requirements of 3.7.3, 3.7.4, and

3.7.6.3. At the end of the test, the power supply shall be tester per 4.5.1, 4.5.2, 4.5.4 and meet the

requirements of 3.7.1, 3.7.3, 3.7.4, and 3.7.6.3 (see 3.7.6.4) .

4.5.12

Surge immunity. The power supply shall continue to operate properly after

subjection to IEC 61000-4-5, Class 4, Level 3, 230VAC, 50Hz or 60Hz AC input. Surge voltage

applied during the test need not exceed 2kV. The unit shall be tested operating with all switches in

the on position. At the end of the test, the power supply shall be tester per 4.5.1 and 4.5.2, and meet

the requirements of 3.7.1, 3.7.3, and 3.7.4 (see 3.7.6.5).