MIL-PRF-15305F
3.19 Solderability. When coils are tested as specified in 4.6.16, they shall meet the applicable criteria for
termination in method 208 of MIL-STD-202 and electrical connections shall be mechanically secure before soldering
and electrically continuous after soldering.
3.20 Resistance to solvents. When coils are tested as specified in 4.6.17, there shall be no evidence of
mechanical damage and the markings shall remain legible.
3.21 Flammability. When coils tested as specified in 4.6.18, there shall be no evidence of violent burning which
results in an explosive-type fire, and the coating material used on the coils shall be self-extinguishing. A coil shall not
be considered to have failed in the event that it is consumed by the applied flame. A coil shall be considered to have
failed only if an explosion of dripping of flaming material occurs, an explosive-type flame is produced, or if visible
burning continues beyond the allowable duration of 3 minutes after removal of the applied flame.
3.22 Marking (not applicable to cylindrical coils). Coils shall be permanently and legibly marked with the military
part number, manufacturer's source code, date code, and lot symbol as shown in the following example. The marking
shall remain legible after all tests.
EXAMPLE:
M15305/1-001
- - - Military part number
or
MS75008-21
12345
- - - Manufacturer's source code
6733A
- - - Date code and lot symbol
3.22.1 Manufacturer's source code and date code.
The manufacturer's source code and date code shall be
marked in accordance with MIL-STD-1285.
3.22.2 Lot symbol. The lot shall be identified by a single letter assigned alphabetically, except that letters "I", "J",
and "O" shall not be used.
3.22.3 For cylindrical coils. Cylindrical coils shall be marked with five colored bands. A silver band MIL identifier
of double the width of the other bands, located near one end of the coil, identifies military radio frequency coils; four
other bands or equal width, three indicating the inductance in microhenries and the fourth band indicating the tolerance
in percent. Color coding shall be in accordance with the color code of table II. When either the first or second band of
the three bands is gold, this band represent the decimal point for inductance values less that 10, and the other two
bands shall represent significant figures. For inductance values of 10 or more, the first two bands shall represent
significant figures, and the third band shall represent the multiplier. For small units, dots may be used instead of bands,
when specified (see 3.1). The diameter of the MIL-identifier dot shall be larger that the other dots. The colors used
shall be in accordance with MIL-STD-1285. Typical color coding for units with inductance values less than 10 and for
10 or greater is shown in figure 1. The marking shall be legible upon completion of each examination or test.
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