MIL-DTL-26518C
d.
The cable on the resistance side shall be supported by air.
e.
The floor or chamber shall have a 1-inch (25.4 mm) thick insulating sheet for support of the
specimen under test.
f.
A milliammeter shall be placed in the circuit between the ground and the arc electrodes.
g.
The specimens shall be cleaned with a clean cloth dampened with alcohol and dried with a soft,
clean, dry cloth before each test.
h.
The arc electrodes shall be cleaned with a soft, clean cloth dampened with alcohol and dried
with a soft, clean, dry cloth before each test.
i.
The primary voltage shall be controlled with a variable tap autotransformer.
j.
Relative humidity shall be between 30 and 40 percent.
k.
The interrupter shall cause an arc to flow 1/4 second and cease l-3/4 seconds repeatedly during
the first minute and to flow 1/4 second and cease 3/4 second repeatedly during the second
minute.
l.
The electrodes shall consist of 2 steel rods, 0.168 inch (4.23 mm) diameter, equipped with
tungsten wire tips, 0.060 inch (1.52 mm) in diameter, which have conical points with a 60°
included angle. The electrodes shall be mounted to an insulated block at 45° to the vertical and
shall be adjusted to give a gap of 0.320 inch (8.13 mm). Both electrodes shall be in the same
horizontal and vertical planes.
ELECTRODES
RESISTANCE AS NEEDED
VARIABLE
AUTOTRANSFORMER
110 VOLTS
60 CPS
MOTOR DRIVEN
INTERRUPTER
MILLIAMMETER
FIGURE 1. Arc resistance test circuit.
4.7.3 Magnetic permeability (see 3.6.2). Permeability shall be measured on class R connectors with an instrument conforming to
ASTM A342. The connectors may be wired or unwired but shall not be carrying current.
4.7.4 Connector mating and unmating forces (see 3.6.3). The axial force mate the connectors shall be measured by applying a
force at that the mating operation is completed in approximately 10 seconds. This test shall be performed both at room temperature
and at required to such a rate that the mating operation is completed in approximately 10 seconds. This test shall be performed both
at room temperature and at 125°C, +3°C, -0°C.
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