MIL-R-19365E
3.13 Thermal shock. When resistors are tested as specified in 4.7.8, the change in resistance shall not exceed 2 percent; and there shall be no evidence of mechanical damage; nor any observable change in resistor coating, enclosure, or other parts which will adversely affect the performance of the resistor.
3.14 Short time overload. When resistors are tested as specified in 4.7.9, the change in resistance shall not exceed 2 percent, and there shall be no evidence of mechanical damage, arcing, burning, or charring.
3.15 Moisture resistance. When resistors are tested as specified in 4.7.10, the change in total resistance and the resistance between the adjustable and fixed end terminals shall not exceed 5 percent. The insulation resistance shall not be less than 2.5 megohms. There shall be no evidence of mechanical damage, breaking, cracking, spalling, nor loosening of terminals or mounting hardware.
3.16 Mechanical strength. When resistors are tested as specified in 4.7.11, there shall be no evidence of mechanical damage.
3.17 Terminal strength. When resistors are tested as specified in 4.7.12, there shall be no evidence of mechanical damage, nor breaking or loosening of terminals.
3.18 Life. When tested as specified in 4.7.13, resistors shall dissipate not less than the rated power input, without exceeding a change in resistance of 5 percent between the initial measurement and any succeeding measurement. There shall be no evidence of mechanical damage.
3.19 Marking. Resistors shall be marked in accordance with MIL-STD-1285. The type designation and the manufacturer's name or code symbol, or both, shall be marked on the body of the resistor, parallel to the longitudinal axis. There shall be no space between the symbols which comprise the type designation. If lack of space requires it, the type designation may appear on two lines. In this event, the type designation shall be divided between the style and the characteristic designations as shown in the following example:
RX29
V100
For resistors having a body of more than 2 inches nominal length, the resistance value in ohms preceded by the abbreviation for "resistance" and the power rating value in watts followed by the abbreviation for "nominal" shall also be marked as shown in the following example:
RX33V162
RES 1600
26 W NOM
(Manufacturer's name or code symbol, or both) Marking shall remain legible at the end of all tests.
3.20 Soldering. Where soldering is employed, only noncorrosive fluxes shall be used unless it can be shown that corrosive elements have been satisfactorily removed after soldering. Solder shall not be used for obtaining mechanical strength. Electrical connections shall be mechanically secure before soldering and electrically continuous after soldering. Except for solder used to coat terminals, the solder used shall in no case start to melt at a
temperature of less than 360OC.
3.21 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of resistor components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.12).
3.22 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the materials meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs.
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