MIL-PRF-19E
3.12 Thermal shock. When resistors are tested as specified in 4.7.7, resistor shall show no evidence of
mechanical damage and the change in resistance shall not exceed ±4 percent.
3.13 Load life. When resistors are tested as specified in 4.7.8, the maximum change in resistance shall not
exceed ±3 percent.
3.14 Salt spray (corrosion). When resistors are tested as specified in 4.7.9, resistors shall show no evidence of
marked corrosion. The resistors shall be mechanically operative and electrically continuous through all three
terminals, over the total mechanical rotation, and shall show no disturbances of the ground connection to the marking
panel.
3.15 Moisture resistance. When resistors are tested as specified in 4.7.10, resistors shall show no evidence of
mechanical damage, and the maximum change in resistance shall not exceed 10 percent. The insulation resistance
shall be not less than 3.5 megohms.
3.16 Resistance to solder heat. When resistors are tested as specified in 4.7.11, resistors shall show no evidence
of mechanical damage and the change in resistance shall not exceed 2 percent.
3.17 Rotational life. When resistors are tested as specified in 4.7.12, the permanent change in resistance shall not
exceed 5 percent, nor shall proper contact be broken during or as a result of the test.
3.18 Switch life. When resistors are tested as specified in 4.7.13, switches shall make, carry, and break, without
damage, the specified current. The contact resistance shall not exceed 0.05 ohm.
3.19 Insulation resistance. When resistors are tested as specified in 4.7.14, the insulation resistance shall not be
less than 100 megohms.
3.20 Shock (specified pulse). When resistors are tested as specified in 4.7.15, there shall be no open circuit or
intermittent contact; movement of the contact arm shall not result in a resistance change greater than 10 percent; the
total resistance shall not change in excess of 2 percent; and there shall be no evidence of mechanical damage.
3.21 Vibration, high frequency. When resistors are tested as specified in 4.7.16, there shall be no open circuit or
intermittent contact; movement of the contact arm shall not result in a resistance change greater than 10 percent; the
total resistance shall not change in excess of 2 percent; and there shall be no evidence of mechanical damage.
3.22 Fungus. All external materials shall be nonnutrient to fungus growth or shall be treated to retard fungus
growth. The manufacturer shall verify by certification that all external materials are fungus resistant or shall test
resistors as specified in 4.7.17. There shall be no evidence of fungus growth on the external surfaces.
3.24 Marking. Resistors shall be permanently marked with the PIN and the manufacturer's name and or
trademark. If space permits, the resistance value shall also be marked. The PIN shall be marked on either the rear
or the periphery of the resistors. There shall be no space between symbols which comprise the PIN, If lack of space
requires it, the PIN may be set in two lines. In this event, the PIN shall be divided between the switch and shaft
designations, as shown in the following example:
RA30NA
SK103A
Marking shall remain legible at the end of all tests.
3.25 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.
3.26 Workmanship. Resistors shall be processed in such a manner as to be uniform in quality and shall be free
from other defects that will affect life, serviceability, or appearance.
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