I am working on an electric apparatus.
I have an interrupter showing strange (high and unstable) electrical
resistance between its contacts, all mechanics is ok, the only
uncommon aspect is that its contacts are made of copper nickel plated
(standard is silver plated).
Resistivity is usually 50-60 microhm, we find unstable values ranging
from 50 to 400 microohm without any correlation.
Have you ever experienced problems in nickel coatings on copper ?
12 years ago