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|  MIL-S-4040F
4.7.2.3 Deactuating voltage (or current) (see 3.5.1.3). With rated mechanical load attached to the armature or
plunger as specified (see 3.1), the solenoid shall be energized with rated load applied. Observe the position of the
armature. Further reduce the voltage (or current) to a value equal to the minimum deactuating voltage specified (see
3.1). Observe the position of the armature. For qualification inspection, unless otherwise specified (see 3.1), the
deactuating voltage (or current) shall fall within the required limits when the solenoid is mounted in each of three
mutually perpendicular planes, one of which shall be that where the plunger gravity force opposes the return spring
force.
4.7.2.4 Operate and release time (see 3.5.1.4). Nominal rated voltage (or current) (see 3.1), shall be applied to
the solenoid. The test shall be performed with the solenoid at a stabilized ambient temperature of 25C 2C and at
the rated high and low temperatures. The time interval between the application of voltage (or current) and the full
travel of the solenoid; and time interval between the removal of voltage (or current) and the full return travel of the
plunger or armature to the deenergized position shall be measured.
4.7.2.5 Coil current (see 3.5.1.5). Coil current shall be measured with the coil at a stabilized ambient temperature
of 25C 2C and rated voltage and with the coil at a stabilized low temperature rating and maximum rated voltage
(see 3.1). The current shall be measured within 10 seconds of application of coil voltage.
4.7.2.6 DC coil resistance (see 3.5.1.6). Solenoids shall be tested in accordance with method 303 of MIL-STD-202.
4.7.3 Insulation resistance (see 3.5.2). Solenoids shall be tested in accordance with method 302 of MIL-STD-202.
The following details shall apply:
a.
Test condition letter: A, for solenoids having a voltage rating of less than 60; B, for solenoids having a
voltage rating of 60 or greater.
b.
Point of measurement: Between the coil and the case.
4.7.4 Dielectric withstanding voltage (see 3.5.3 and table V).
4.7.4.1 At sea level. Solenoids shall be tested in accordance with method 301 of MIL-STD-202. The following
details shall apply:
a.
Magnitude of test voltage: The magnitude of the test potential shall be based on the coil voltage rating
(see table V).
b.
Nature of potential: Alternating current (ac).
c.
Duration of test voltage: Five to 15 seconds for the conformance inspection.
d.
Point of application of test voltage: Between the coil and the case.
After the test, solenoids shall be inspected for any evidence of damage, arcing, and breakdown. Leakage current
shall be measured.
TABLE V. Dielectric withstanding voltage (at sea level) potential.
Voltage rating
RMS test voltage
Less than 60
1,000
60 to 250, inclusive
1,500 + rated voltage
Over 250 to 500, inclusive
2 X voltage rating + 1,000
10
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