IC Test Equipment Accessories - Page 2 of 2: Test Head Manipulators and Docking Systems

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IC Test Equipment Accessories - Page 2 of 2

Test Head Manipulators and Docking Systems

Modern ATE systems have a large test head that needs to interface with the handler system. Test heads are oftentimes too bulky for easy manipulation, so the test technician needs what is known as a test head manipulator or positioner for easier handling of the test head during the interfacing process.

Fig. 3. Examples of Test Head Manipulators

Test head manipulators are basically mobile frame structures designed to hold and position ATE test heads for docking with a test handler, consisting of a system of wiring conduits with several axes of manipulation, counter-weighing mechanisms, and powered or manual gearing. Manipulators must be stable, reliable, and quick to set up.

Today's trend toward bigger, more capable test heads requires state-of-the-art manipulators that are more than just strong. The test head bundles are becoming more rigid and delicate, requiring more wiring and cooling conduits. Operators must be given more control of the test head during the docking and undocking process. Thus, a good manipulator also addresses the need for critical cable management and smooth handling, while independently controlling linear and rotational motions. Ease of docking and protection of delicate electrical interface components are a must.

Aside from test head manipulators, modern ATE systems and handlers also need a 'docking' system in order to interface with each other. Years ago, ATE systems get interfaced to a handler just through cables and connectors. Although this is a cheap way to get the ATE talking to the handler, it has some major disadvantages: 1) it can become disorderly and more difficult to set up; 2) it results in RF losses; 3) it is notorious for intermittent or poor contacts; and 4) it is inadequate for complex ATE/handler systems.

Today's highly competitive semiconductor testing industry requires not just a quick and convenient process for interfacing an ATE to a handler, but also a way to interface any tester to any handler. A universal, adjustable docking system is the answer to these needs.

Fig. 4. Examples of Docking Systems

A docking system (see Fig. 4) is a test equipment accessory that mechanically connects the test head of an ATE to the handler, providing a robust, stable, and accurate interface between the ATE and the handler. By employing a standard and carefully selected docking system on the test floor, tester and handler interchangeability may be achieved to boost flexibility and productivity.

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