MIL-DTL-24643C
b. Conductor to conductor (cable): Specimens incorporating only multiple insulated conductors without
individual shields, or a combination of multiple unshielded insulated conductors (as individual conductors or
component pairs, triples, or groups) and one or more individually shielded, insulated conductor transmission lines:
one unshielded insulated conductor shall be selected and electrically connected to one terminal of the voltage source.
All other specimen unshielded insulated conductors shall be electrically connected to the other voltage source
terminal. The voltage withstand test shall then be performed as specified. In a similar manner, the voltage
withstand test shall be performed between each remaining unshielded insulated conductor within the specimen and
the short circuited combination of all other unshielded insulated conductors. If the specimen incorporates an overall
shield, then the voltage withstand test shall additionally be performed between the overall shield and the short
circuited combination of all unshielded insulated conductors that are outmost in the specimen. (Additional
measurements may be required, see a, c, d, e, and f.)
c. Conductor to component shield (shielded components). Specimens incorporating one or more individually
shielded, insulated conductor transmission lines. One transmission line shall be selected for measurement. The
conductor, or if a pair or triple: the short circuited combination of all conductors within this transmission line shall
be electrically connected to one terminal of the voltage source, and the transmission line shield shall be electrically
connected to the other voltage source terminal. The voltage withstand test shall then be performed as specified.
Following this, and in an identical manner, the voltage withstand test shall be performed on all remaining
transmission lines within the specimen. (Additional measurements may be required, see d, e, and f.)
d. Conductor to component shield (cable). Specimens incorporating combinations of one or more individually
shielded, insulated conductor transmission lines, and one or more unshielded, insulated conductors (as individual
conductors or in component pairs, triples, or groups): one shield of a shielded transmission line shall be selected and
electrically connected to one terminal of the voltage source. All specimen unshielded, insulated conductors shall be
electrically connected to the other voltage source terminal. The voltage withstand test shall then be performed as
specified. In a similar manner, the voltage withstand test shall be performed between each remaining shielded
transmission line within the specimen and the short circuited combination of all unshielded, insulated conductors.
(Additional measurements may be required, see e and f.)
e. Component shield to shield. Specimens incorporating two or more individually shielded insulated
conductor transmission lines (these measurements shall be required only when component shield to shield
measurements are specified, see 3.1): one component shield shall be selected and electrically connected to one
terminal of the voltage source. All other specimen component shields shall be electrically connected to the other
voltage source terminal, and the voltage withstand test shall then be performed as specified. In a similar manner, the
voltage withstand test shall be performed between each remaining component shield within the specimen and the
short circuited combination of all other component shields. If the specimen incorporates an overall shield, then the
voltage withstand test shall additionally be performed between the overall shield and the short circuited combination
of all component shields that are outmost in the specimen. (Additional measurements may be required, see f.)
f. Jackets. All one conductor shielded specimens, and all multi-conductor specimens (these measurements
shall be required only when measurements to water or to ground are specified, see 3.1): the specimen shall be
submerged, except for its extreme ends (which shall remain exposed to the air), in the water tank for a period of not
less than 1 hour. Following this, and while the specimen is still submerged, the specimen shall be tested as follows.
The overall specimen shield (if any), or if there is no overall shield, all individual shields which are outermost in the
specimen core plus all unshielded conductors which are outermost in the specimen core, shall be electrically
connected to one terminal of the voltage source. The other voltage source terminal shall be electrically connected to
the water surrounding the specimen (as by means of a bare metal wire which is both connected to the voltage source
terminal and suspended within the water surrounding the specimen). The voltage withstand test shall then be
performed as specified.
g. Conductor to ground. Specimens incorporating a single insulated, jacketed conductor without shield or
armor shall be tested to water. The specimen shall be submerged, except for its extreme ends (which shall remain
exposed to the air), in the water tank for a period of not less than 1 hour. Following this, and while the specimen is
still submerged, the specimen shall be tested as follows. The single conductor shall be electrically connected to one
terminal of the voltage source. The other voltage source terminal shall be electrically connected to the water
surrounding the specimen (as by means of a bare metal wire which is both connected to the voltage source terminal
and suspended within the water surrounding the specimen). The voltage withstand test shall then be performed as
specified.
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