MIL-DTL-49104C
4.5.8 Dielectric strength. The dielectric strength of the finished cable shall be measured as specified
in method 6111 of FED-STD-228, except that:
a. The immersion period shall be 4 hours.
b. One terminal shall be both conductors connected together and the other shall be the water.
4.5.9 Insulation resistance. The insulation resistance of the finished cable shall be measured after
the dielectric strength test (see 4.5.8) is accomplished. This test shall be performed as specified in
method 6031 of FED-STD-228, except that:
a. The immersion period shall be 4 hours.
b. The test voltage shall be not less than 100 volts dc.
c. The polarity of the conductors shall be maintained negative with respect to the water.
d. One terminal shall be both conductors connected together and the other shall be the water.
e. For the purpose of computation, twice the field wire footage shall be taken as the length of
conductor under test.
f. If the measurement is made at a temperature other than 15.6 °C, the measured value of insulation
resistance shall be corrected to15.6 °C. However, if the insulation resistance is equal to or greater than
that required by 3.5.3, then the measurement is made at a temperature greater than 15.6 °C, and no
correction factor need be employed.
g. The insulation resistance test may be terminated in less than one minute if the galvanometer has
ceased fluctuating and the reading indicates that a steady insulation resistance value has been obtained.
However, readings obtained on 5% of the lengths after 1 minute electrification shall be recorded.
4.5.10 DC resistance. The dc resistance of the finished cable shall be measured after the dielectric
strength test (see 4.5.8) is accomplished. The test shall be performed as specified in method 6021 of
FED-STD-228, except that the immersion period shall be 4 hours.
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