MIL-DTL-26517B
3.5.12 Efficiency. The overall efficiency shall be not less than that shown in the acquisition document (see
4.5.5 and 6.2).
3.5.13 Ripple voltage. The peak ripple in the DC output voltage shall not exceed 1.5 V (see 4.5.10).
3.5.14 Insulation. The current-carrying parts of the power supply shall be insulated from the frame. The
insulation shall be capable of withstanding 1,500 V root-mean-square (rms) at commercial frequency between any
terminal and the frame of the power supply (see 4.5.4).
3.5.15 Position. The power supply shall operate satisfactorily when mounted in any position, except that
completely static power supplies shall conform to the requirements of the acquisition document (see 6.2).
3.6 Interchangeability. All parts having the same manufacturer's part number shall be functionally and
dimensionally interchangeable. The drawing number requirements of DOD-D-1000 shall govern changes in the
manufacturer's part numbers.
3.7 Radio interference. The power supply shall meet the radio interference requirements of MIL-STD-461 (see
4.5.9).
3.8 Dimensions and weight. The dimensions and weight of the power supply shall be as specified in the
acquisition document (see 6.2).
3.9 Screw threads. Unless otherwise specified, the threads of all machine screws 0.060 inch or larger in
diameter shall conform to MIL-S-7742.
3.10 Finishes and protective coatings.
3.10.1 Aluminum-alloy parts. Wherever practicable, aluminum alloy parts shall be anodized in accordance
with MIL-A-8625. The aluminum-oxide film formed by this treatment shall be removed from the actual contact area
of all surfaces required to act as a path for electrical current and from the local areas under screws, nuts, etcetera,
used for assembly or mounting purposes, to provide adequate bonding connections.
3.10.2 Magnesium-alloy parts. Wherever practicable, magnesium-alloy parts shall be surface treated in
accordance with SAE AMS-M-3171 to provide protection against corrosion.
3.10.3 Plating. Cadmium plating shall be in accordance with QQ-P-416, Type II, and of a class that is adequate
to achieve the degree of protection required.
3.11 Identification of product. Equipment, assemblies, and parts shall be marked for identification in
accordance with MIL-STD-130. The following information shall be included:
____ A, 28 VDC
Input 200 V, 3 phase, 400 Hz
For 28 VDC system
3.12 Workmanship. The power supply, including all parts and accessories, shall be constructed and finished in
a thoroughly professional manner. Particular attention shall be given to neatness and thoroughness of soldering,
wiring, impregnation of coils, marking of parts and assemblies, welding and brazing, painting, riveting, machine-
screw assemblies, and freedom of parts from burrs and sharp edges.
3.12.1 Screw assemblies. Assembly screws and bolts shall be tight. The word tight means that the screw or
bolt cannot be appreciably tightened to exceed its clamp-load without damage, injury or stretch to the screw, bolt, or
threads.
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