Test protocol 4-wire (Kelvin) is a selectable option in the A6 and A5 flying probe tester models. Places two probes on each pad, assigning a separate current and voltage source. Has eight and 16 head designs. Can be ordered with full PCB automation. A standard four-head probe system reportedly can achieve a max. test speed of 22 test pt./sec. A multi-rail system is said to reach test speeds in excess of 35 - 40 test pt./sec. Can adapt a wide range of test pin types. Needle options include standard Kelvin needle and blade type Kelvin needle. 4-wire measurement achieves a minimal threshold value down to 0.1 mOhm. 4-wire needles can meet the specification value down to 75 µm pad and 150 µm for pitch.

atg Luther & Maelzer GmbH, www.atg-test-systems.de