MIL-DTL-39030F
3.4.4.3 Duty cycle. The ratio of the average power to the peak power is the duty cycle and represents
the percentage of time the power is present.
3.4.5 Fabrication of shell. The shell of the dummy load shall be forged cast, or fabricated of plate,
sheet, drawn or extruded stock, or a combination of some of or all of the methods. The choice of the shell
material configuration shall provide sufficient heat transfer to prevent the exceeding of the maximum
specified exposed temperature under conditions of simultaneous maximum (1) rated power, (2) ambient
temperature and (3) altitude (see 3.1).
3.4.6 Finish (critical interface). Unless otherwise specified (see 3.1), the finish shall be as specified in
3.4.6.1 Materials.
3.4.6.1.1 Gold bodies. Gold bodies shall be plated to a minimum gold thickness of 50 micro inches
(1.27 µm) in accordance with ASTM B488, type II code C, class 1.27, over 50 µ inches (1.27 µm)
minimum of nickel in accordance with SAE-AMS-QQ-N-290, class 1, measured anywhere along the
mating surface, for all series.
3.4.6.1.2 Gold contacts. The male pin shall be plated to a minimum gold thickness of 50 micro inches
(1.27 µm) in accordance with ASTM B488, type II, code C, class 1.27, over 50 micro inches (1.27 micro
meters) minimum of nickel in accordance with SAE-AMS-QQ-N-290, class 1, measured anywhere along
the mating surface, for all series. The socket contact shall be plated to a minimum of 50 micro inches
(1.27 micro meters) of gold in accordance with ASTM B488, type II, code C, class 1.27, over 50 micro
inches (1.27 micro meters) of nickel in accordance with SAE-AMS-QQ-N-290, class 1, including the I.D.,
measured at a depth of .040 inch (1.01mm) minimum. The plating on non-significant surfaces in the I.D.
shall be of sufficient thickness to ensure plating continuity and uniform utility and protection. This plating
may consist of an underplate only. A silver underplate shall not be permitted on any contact, pin or
socket.
3.4.6.1.4 Silver. Silver shall be in accordance with ASTM B700.
3.4.6.1.5 Tin. Tin shall be in accordance with ASTM B339 or ASTM B545, 97% pure, maximum.
3.4.6.1.6 Paint. Paint shall be in accordance with MIL-F-14072, Enamel, Alkyd, Gloss, (for external
and internal surfaces).
3.4.6.1.7 Anodic coating. Anodic coating shall be in accordance with MIL-A-8625.
3.4.6.3 Aluminum alloys. Aluminum alloys surfaces shall be chemically treated and in accordance with
3.4.7 Threaded parts. All threaded parts shall have screw threads in the unified screw threads series
in accordance with FED-STD-H28 and supplements.
3.4.8 Weight. The weight shall be as specified (see 3.1).
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