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| ＝ Harmonious Current Flow for
Lifecycle |
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| Plungers are generally
manufactured from beryllium copper(BeCu) or Brass, heat
treated, and plated with gold or rhodium. BeCu is used
because it is an excellent conductor and is easily machined
and hardened. Plungers are gold plated for applications
that require low electrical resistance over a broad range
of environmental conditions. Rhodium plating is very hard
and corrosion resistant, and is typically preferred when
maximum tip life is important. Some tip styles requiring
extended tip life are made of steel, heat treated, and
plated with gold or hard nickel. |
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The probe barrel
is generally deep drawn from nickel silver, brass or beryllium
copper.
Deep drawing hardens the barrel, providing added strength
and durability. Nickel silver is a good electrical conductor
and povides excellent dimensional repeatability, ensuring
consisten parts from lot to lot. Very small diameter barrels
are often made of beryllium copper because of its superior
conductiity and hardness characteristics. |
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The spring provides
the required compliant force at the plunger tip, and the
contact force between the barrel and plunger.
Music wire, stainless steel and beryllium copper are commonly
used for compression spring fabrication. Spring are made
from specially drawn lots of these wire alloys. Spring
materials may also be plated with precious metals to improve
electical performance and prevent corrosion. Materials
should be selected to meet your specific application and
requirements.
Music Wire is a high-cardon steel wire chosen for
its consistency and strength.
Stanless Steel Wire is also very strong. It is
typically preferred for high temperature applications
and corrosive environments. Tensile strength is less than
that of music wire, but its resistance to fatigue is excellent.
Beryllium Copper is the weakest of the spring materials.
Its strength is derived from heat treating after the spring
is helically formed, and it is used for low-resistance
applications. |
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The resistance of
a Battery Interconnect probe is dependent upon the base
materials, platings and physical design.
The typical current path of a probe is from the plunger
to the barrel.
The figure below the typical current path of a probe combination.
Approximately 99% of the current will follow the path.
The remaining 1% of the current will flow through the
spring. |
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