Measuring Contact Resistance
Original Publication Date: 1978-Jan-01
Included in the Prior Art Database: 2005-Feb-20
In the new technology printed-circuit cards and boards, there are large numbers of contacts and bulk resistances to be measured on large board vehicles. Circuit lines are long and of small cross-section making them high resistance. Typically, the value to be measured can only be accessed through the technology cable harness and cannot be hand-probed in sufficient quantities to support the low failure rates projected for the parts. Any disturbance or unwanted resistance value in a circuit is too large to be tolerated, and an alternate measurement technique is required to eliminate this disturbance value through a four-point probe technique.