MIL-PRF-22E
3.7 Torque (see 4.7.4).
3.7.1 Operating. When resistors are tested as specified in 4.7.4.1, the torque required to rotate the contact arm
shall be as specified (see 3.1).
3.7.2 Stops. When resistors are tested as specified in 4.7.4.2, there shall be no mechanical damage to the contact
arm, stop, and nonturn device, as applicable.
3.7.3 Locking (when applicable). When resistors are tested as specified in 4.7.4.3, there shall be no damage to
the bushing, threads, and nonturn device. The contact arm shall not move when subjected to the specified torque.
3.8 Low temperature exposure. When resistors are tested as specified in 4.7.5, the torque required to rotate the
contact arm shall not exceed the value specified (see 3.1). There shall be no discontinuity, electrical connections
shall not be affected, nor shall there be any loosening of rivets or evidence of any other mechanical damage.
3.9 Power rating. When resistors are tested as specified in 4.7.6, the hotspot temperature shall not exceed the
temperature specified (see 3.1).
3.10 Load life. When resistors are tested as specified in 4.7.7, the change in total resistance measurement and
each of the succeeding total resistance measurements shall not exceed 5 percent, nor shall there be any evidence of
mechanical damage.
3.11 Vibration, low frequency. When resistors are tested as specified in 4.7.8, there shall be no evidence of
intermittent contacts or electrical discontinuity. The total resistance shall not change in excess of 5 percent. The
contact arm shall not move more than 2 degrees, nor shall there be a change in resistance between the contact arm
terminal and either end terminal in excess of 5 percent. There shall be no evidence of mechanical damage.
3.12 Salt spray (corrosion). When resistors are tested as specified in 4.7.9, there shall be no appreciable
corrosion. Resistors shall be mechanically operative and electrically continuous, and the mounting hardware
(see 3.4.9) shall be readily removable.
3.13 Humidity (steady-state). When resistors are tested as specified in 4.7.10, the change in total resistance shall
not exceed 10 percent between the initial total resistance measurement and each succeeding total resistance
measurements.
3.14 Rotational load life. When resistors are tested as specified in 4.7.11, the change in total resistance shall not
exceed 5 percent between total resistance measurement and the final total resistance measurement. During and
after the tests, the resistors shall be mechanically operative, there shall be no evidence of intermittent contact
between the contact arm and resistance element, and mechanical damage.
3.15 Terminal strength (when applicable). When resistors are tested as specified in 4.7.12, there shall be no
evidence of mechanical damage and the change in total resistance shall not exceed 1 percent.
3.16 Shock (specified pulse). When resistors are tested as specified in 4.7.13, 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
3.17 Acceleration (when applicable). When resistors are tested as specified in 4.7.14, 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 3 percent; and there shall be no evidence of mechanical
damage (see 3.1).
3.18 Vibration, high frequency. 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 that 10 percent; total
resistance shall not change greater in excess of 2 percent; and there shall be no evidence of mechanical damage.
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