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|  MIL-S-4040F
4.7 Methods of inspection.
4.7.1 Visual and mechanical inspection. Solenoids shall be inspected to verify that the materials, design,
construction, physical dimensions, marking, and workmanship are in accordance with the specified requirements (see
3.1, 3.4, 3.5, 3.8, and 3.9).
4.7.2 Electrical characteristics.
4.7.2.1 Operating force (torque) (see 3.5.1.1). Unless otherwise specified (see 3.1), the operating force (torque) of
the solenoids shall be tested in accordance with the following details.
4.7.2.1.1 For first article inspection.
a.
Points of measurement:
(1)
At the beginning of the solenoid's stroke (0 percent to 5 percent).
(2)
Full stroke force or torque (95 percent to 100 percent of stroke (when specified, see 3.1)).
(3)
Holding force (when specified, see 3.1).
b.
Magnitude of test voltage and temperature: This test shall be conducted at the values of the upper and
lower, and lower and upper limits of the voltage and temperature ranges, respectively.
c.
Nature of potential: With specified load applied to the solenoid (see 3.1).
d.
Duration of applied voltage: The duty cycle of intermittent duty solenoids shall not be exceeded.
e.
Attitude(s) during testing: See 3.1.
f.
Applied load: A static load equal to the specified force (torque) (see 3.1) shall be applied to the armature or
plunger.
g.
Force (torque) measurement: With the solenoid mounted in the specified attitude(s) and at ambient
temperature, and with a load in accordance with 4.7.2.1.1f, the output force (torque) shall be equal to or
exceed the static output force (torque) with the specified voltage applied to the coil.
4.7.2.2 Compensated actuating voltage (see 3.5.1.2). Unless otherwise specified (see 3.1), the compensated
actuating voltage of the solenoids shall be tested in accordance with the following details:
a.
Magnitude of test voltage and temperature: This test shall be conducted at the voltage equivalent to
minimum voltage at maximum temperature.
b.
Nature of potential: See 3.1.
c.
Duration of applied voltage: The duty cycle of the intermittent duty solenoids shall not be exceeded (see
3.1).
d.
Mounting the solenoid for test: The solenoid shall be mounted by its normal mounting means and in its
normal mounting attitude.
Temperature and load: With the solenoid at a stabilized temperature of 25C 2C, it shall generate
e.
sufficient mechanical force (torque) at the specified compensated actuating voltage (or current) (see 3.1) to
cause full plunger (or armature) travel in the energized position against the specified value (see 3.1) or load
(force or torque).
f.
Observe the position of the armature.
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