Rubber keypad switch - contact resistance

[mirror359]

I have a product for automotive that uses rubber keypads with gold/nickel plating over copper contact on a gold plated PCB. 5VDC with a current of 0.001 to 0.025A. Contacts are 3mm dia. How would I calculate what the contact resistance should be? I have a 15milliohm max requirement from FORD. Is this atainable?

 

[Lewish]

Why don't you ask them how "they" would measure it. Then you will get the same result they do when they check your product. Otherwise, yes that should be obtainable.

 

[melone]

What is this for? I have worked with the Big 3 for years and am not familiar with anything that would require pushbuttons.

Other than that, I quess I am confused on what your question is. If you know how much resistance you have in your circuit, you know how much current you are going to sink / source, and you know how much of a voltage drop you are allowed to have, why can't you figure out how much extra resistance (contact resistance) you can tolerate?