MIL-DTL-3883B
4.5.2.2 Insulation resistance (see 3.5.2). The insulation resistance of the finished cord shall be
determined as specified in FED-STD-228, method 6031 except for the following:
a. The test shall be performed on finished cord only.
b. The immersion period shall be not less than 9 hours.
c.
The test voltage shall be not less than 100 volts or more than 500 volts dc.
d. The polarity of the conductor shall be maintained negative with respect to the water. One
terminal shall be each conductor in turn, and the other terminal shall be all the remaining
conductors tied together in electrical contest with one another and the shield, and the water.
e. If the measurement is made at a temperature lower than 15.6°C, the supplier shall correct the
measured value of insulation resistance to the resistance at 15.6°C.
4.5.2.3 Conductor resistance. The DC resistance of each conductor in a finished cord shall be
determined in accordance with FED-STD-228, method 6021, and shall meet the requirements of 3.5.3.
4.5.2.4 Capacitance (see 3.5.4). The capacitance per foot of cord between each conductor and all
other conductors connected together with the shield shall be measured at a frequency of 1000 Hz by
using an alternating current balanced bridge method accurate to within ¼ of 1 percent.
4.5.3 Physical tests.
4.5.3.1 Cold bend (see 3.6.1).
4.5.3.1.1 Specimen. One specimen shall be cut from each sample unit. Each specimen so cut shall
be divided into two parts, one for checking the cord as a whole, and the other for checking the insulation
apart from the cord.
4.5.3.1.2 Procedure. The specimens selected for checking cord as a whole shall be attached to a
mandrel of the proper size as specified in 4.5.3.1.3. The specimens selected for checking the insulation
apart from the cord shall have the jacket removed, and each insulated conductor there from shall be
attached to a mandrel 0.062 inch diameter. The specimens shall be suspended vertically, with their lower
ends weighted sufficiently to keep the specimens taut and to permit bending them without handling. The
mandrel and specimen shall be placed for at least 20 hours in a cold chamber at a temperature of -55° ±
2°C and, while at this temperature, bent for five close turns around the mandrel at the rate of 15 ± 3 turns
per minute. After the test has been completed, the jacket on the specimens of the cord shall be
examined through a magnifying glass of at least 3-diameter magnification. The jacket shall then be
removed so that the insulation can be examined. The insulation on all specimens shall be examined for
cracks with the magnifying glass.
8
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business