MIL-DTL-18266C
4.4 Inspection conditions. Unless otherwise specified, all inspections specified herein shall be made
under the following ambient conditions:
a. Temperature: From +20 degrees to +35 degrees C.
b. Pressure:
From 28 to 30 inches of mercury (13.75 to 14.74 PSI).
c. Humidity:
From 15 to 90% relative.
4.4.1 Tolerances. Where specific tolerances are not given, the maximum allowable tolerances on test
condition measurements shall be as follows:
± 2 degrees C.
a. Temperature:
± 5 percent (%) relative.
b. Humidity:
4.4.2 Test equipments. All instruments used in performing the tests required by this specification shall
meet at least one of the following requirements:
4.4.2.1 Specific approval. All instruments shall be acceptable to the responsible government inspector
and the procuring activity, as indicated by written approval on file at the contractor's plant.
4.4.2.2 Audio oscillator. The audio oscillator shall have a frequency range of at least 100 to 10,000
Hz, shall have a high degree of stability in both output voltage and frequency and shall have a waveform
distortion of less than 2 percent.
4.4.2.3 Voltmeter. The voltmeters used shall have flat frequency response (± 1 dB), from at least 100
to 10,000 Hz, and shall be capable of measuring voltages from 0.005 volt to 100 volts).
4.4.2.4 Distortion analyzer. The distortion analyzer shall be of the wave analyzer or total distortion
type. The frequency range shall be at least 100 to 10,000 Hz with high selectivity and an input voltage
range from 0.001 to 10 volts.
4.5 Cordage test methods.
4.5.1 Visual inspection. The visual inspection shall be an examination of the cordage to determine that
the materials, physical dimensions and method of construction are as specified.
4.5.1.1 Construction. The diameter, thickness of the conductor insulation and jacket of the cordage
shall be measured by means of a measuring microscope or other gage accurate to 0.001 inch (0.03 mm)
and capable of being operated in such a way as not to deform the insulation significantly.
4.5.1.2 Stripping. Irregularities in the jacket edge due to stripping shall not exceed 3/16 (0.188) inch
(4.76 mm) overall.
4.5.2 Dielectric strength (see 3.3.5). The finished cordage shall be immersed in tap water at room
temperature for 24 hours, with the end terminals entirely above the surface of the water. At the end of
this period, a potential of 500 volts rms, 60 Hz shall be applied for 1 minute between the two conductors,
and between each of the two conductors and the water in which the cordage is immersed.
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