MIL-DTL-18266C
4.5.3 Insulation resistance (see 3.3.6). The insulation resistance shall be measured immediately
following the Dielectric Strength Test with a suitable resistance measuring device, using a 500-volt dc
potential. The conductors shall be maintained negative, with respect to the ground. The insulation
resistance shall be determined one minute after voltage application, or sooner if the reading of the
resistance measuring device remains steady.
4.5.4 Flame-retardant cord (see 3.5.1). The flame-retardant test shall be performed, with the test
sample fully extended in a horizontal position and in still air.
4.5.5 Tensile strength and elongation (see 3.3.4). The tensile strength and elongation of the coated
conductor strands, removed from the insulated conductor prior to cabling, shall be tested in accordance
with FED-STD-228, method 3211.
4.5.6 Flexing (see 3.3.9). The flexing tests shall be conducted in accordance with MIL-DTL-10392.
4.5.7 Cold bend (see 3.5.4). The cold bend test shall be conducted in accordance with
MIL-DTL-10392. Immediately following the cold bend test, the dielectric withstanding voltage test of
MIL-DTL-10392 shall be performed, with the specimens immersed in tap water, a potential of 500 volts
rms at 60 Hz applied between each conductor (in sequence) and the other 2 (two)conductors tied
together in electrical contact with the water, and for a period of 1 (one) minute.
4.6 Cord test methods.
4.6.1
Visual inspection. Each cord shall be visually inspected to insure that:
a. All external surfaces, including any plated parts, are free from blemishes which would permit
breaking of the protective coating.
b. All moldings are free of wrinkles, excessive flash and fins.
c. All markings are complete and in accordance with figure 1.
d. The weight and all overall dimensions are correct by comparison with figure 1.
4.6.2 Electrical continuity (see 3.3.3.2). Each conductor shall be checked for electrical continuity with
a circuit checker, ohmmeter, or similar instrument.
4.6.3 Transformer dc insulation resistance (see 3.3.7). The insulation resistance between the primary
and secondary windings within the transformer-plug shall be measured between the tip or sleeve and the
earphone terminals using any standard meg-ohmmeter circuit, which is designed to apply at least 500
volts dc across the test terminals during the measurement.
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