Patent ID: 7074072

Claim:
A contact-making apparatus for making contact with circuit units to be tested in a tester, comprising: a printed circuit board device having electrical connections to the tester; a test module device having first contact-making elements for making electrical contact between said test module device and said printed circuit board device and second contact-making elements disposed on a side of said test module device facing away from said first contact-making elements, for making electrical contact between maid test module device and a circuit unit to be tested; said first contact-making elements having a first non-linear spring force against compression characteristics and said second contact-making elements having a second non-linear spring force against compression characteristics, and curves representing said first and second non-linear spring force against compression characteristics intersecting at a point of intersection, so that when said printed circuit board device and the circuit unit to be tested are pressed onto each other, starting from an uncompressed state, said first and second contact-making elements being compressed via a low initial compression and finally being compressed as far as a high final compression; said first contact-making elements having a spring force being lower than a spring force of said second contact-making elements under the low initial compression; and said spring force of said first contact-making elements being higher than said spring force of said second contact-making elements under the high final compression.