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A TECHNIQUE IS DESCRIBED WHEREBY INSULATION DISPLACEMENT connector (IDC) contacts, when used in conjunction with stranded wire, are tested in such a way so to detect potentially defective connections.
English (United States)
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Method of Testing Insulation Displacement Contacts
A TECHNIQUE IS DESCRIBED WHEREBY INSULATION DISPLACEMENT
connector (IDC) contacts, when used in conjunction with stranded wire, are
tested in such a way so to detect potentially defective connections.
The use of IDC connections is well known in the electrical connector industry,
particularly in telephone circuitry where solid conductor wire is used. However,
defects have appeared regularly when attempting to use stranded wire in
conjunction with the IDC connectors. Previously accepted testing methods, such
as the use of elevated temperature and humidity, while measuring resistance
changes between the wire and the connector, have not proved to be satisfactory.
This is because the insulation material, such as polyvinyl chloride, used with the
wire is known to "outgas" and become hard or brittle so as to prevent the
stranded conductor from assuming a shape to relieve the stress that creates a
reliable connection. The technique described herein elimantes the need to
elevate temperature and humidity, in a chamber. The testing process consists of
the use of an infra-red camera, at ambient temperatures, to observe uneven
temperature gradients which may appear during the passage of rated current, or
higher, through the connector. When a change in temperature is observed, the
contact is then examined through the use of an x-ray machine or through
matallurgical cross sectioning, so that appropriate changes may be made in t...