Traditional continuity test methods only do a basic pass/fail test that may miss critical defects. 4-wire Kelvin test is the best method for ensuring that circuit connections are optimal. Kelvin tests detect defects such as via and hole wall conductivity issues, trace line imperfections that cause high resistance, and surface contaminations that cause contact issues.
Kelvin Test, also known as 4 terminal sensing, is a method for making resistance measurements very accurately. It can be used to measure very low resistance. Each of the two test points has two probes, one force probe and one sense probe. The force probe applies a constant current, while the sense probe measures the voltage. A very accurate resistance reading is derived from the sense probe’s measurement.
Look out for this on Drawings.. we cannot currently do this, if required, we would need to find a subcontractor ?