NX 32 WLT

The Ismeca NX 32 WLT is a handler. The equipment is made by Ismeca. The model designation is NX 32 WLT.^[1]

An automatic test handler moves a device through an input station, a contact station, and an output station. In the contact station, the device is aligned and pressed against contacts that connect it to test instrumentation. After the tester completes a measurement, the handler either returns the device to an input tray, places it into a bin, or routes it to the next operation according to the result.

Wafer-level handlers align a wafer to a probe head and step the wafer so that each die can be contacted in turn. Package handlers guide singulated components through a test socket using tracks, carriers, or pick-and-place tooling. Many handlers include temperature conditioning so that testing can be performed at elevated or reduced temperatures.

The machine belongs in the test area of semiconductor fabrication. At wafer level, the handler is used before dicing, when all dies are still on the wafer. At package level, the handler is used after assembly, so that the finished component is tested just before final packing.

Failing devices are separated from known-good devices at this stage. The tested units then move to shipping, tape and reel, or further handling operations.

Wafer-level applications include chip probing of die on a completed wafer. Package-level applications include final test of individual integrated circuits. The handler is used in production environments where automated sorting is required.