Selection of the most appropriate pins for use on a component test fixture requires consideration of both mechanical and electrical issues.

In production environments, the mechanical issues are often considered first and in this respect; spring pins are usually the most popular choice. This is because spring pin fixture solutions are simpler to make, usually have a longer lifespan and are easier to maintain.

However, when a test fixture must be capable of precision low impedance measurements, true four-wire termination is required.

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