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At reduced barometric pressure (high altitude) |
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|  MIL-S-4040F
4.7.4.2 At reduced barometric pressure (high altitude). Solenoids shall be tested in accordance with method 105
of MIL-STD-202. The following details shall apply:
a.
Test condition letter: See 3.1.
Magnitude of test voltage: The magnitude of the test potential shall be 350 volts 10 volts.
b.
c.
Nature of potential: Alternating current (ac).
d.
Duration of test voltage: Five to 15 seconds for conformance inspection.
e.
Point of application of test voltage: Between the coil terminals and the case.
After the test, solenoids shall be inspected for any evidence of damage, arcing, and breakdown. Leakage current
shall be measured.
4.7.5 Mounting stud and terminal strength (see 3.5.4). The solenoid studs, as applicable, shall be subjected to the
tensile and torque loads specified in 3.5.4 and applied parallel to the axis of the studs for a period of 1 minute. There
shall be no mechanical failure resulting from these tests. Lead wire terminals No. 22 AWG or larger shall be
subjected to 4.5 pounds pull for a minimum of 30 seconds. There shall be no mechanical or electrical impairment
resulting from the test. Lead wire smaller than No. 22 AWG shall be tested as specified (see 3.1).
4.7.6 Static spring return force (see 3.5.5). The static spring return force (torque) shall be measured in pounds or
inch-pounds at the following percentages of plunger travel (with coil deenergized): (0-5) and (95-100). The attitude
of the solenoid during the test shall be such that the plunger gravity force does not oppose the spring force (torque).
4.7.7 Magnetic effect (see 3.5.6). The solenoid shall not produce a magnetic field greater than the field produced
by a straight bus bar carrying a direct current of 15 times with coil current of the solenoid. The coil current shall be
that produced when the temperature of the coils is 25C 2C and maximum operating voltage is impressed thereon.
The field shall be measured by a suitable fluxmeter with the search coil adjacent to the coil housing or bus bar in the
position causing the greatest deflection of the meter.
4.7.8 Thermal shock (see 3.6.1). Solenoids shall be tested in accordance with method 107 of MIL-STD-202. The
following details shall apply:
a.
Test condition: See 3.1. Exposure time shall be one hour at each temperature extreme.
b.
Measurement during cycling: During the last 10 minutes of the fifth temperature cycle at both high and low
temperatures, the solenoid shall meet the requirements of operating force (torque) (see 3.5.1.1) and
deactuating voltage (or current) (see 3.5.1.3) and shall return to room temperature.
c.
Measurement after cycling: Compensated actuating voltage shall be tested as specified in 4.7.2.2. The
solenoids shall then be inspected for cracking, peeling, and flaking of the case and finish.
4.7.9 Solderability (see 3.6.2). Solenoids having solderable terminals shall be tested in accordance with method
208 of MIL-STD-202, except that the dipping device need not be used.
a.
Number of terminations of each part to be tested: Two.
b.
Solder dip: Not applicable.
c.
Inspection of terminations: Fillet area.
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