Switches and Multiplexers

Many automated test applications require signal routing to various instruments and devices under test (DUTs). Switch networks are often built to facilitate signal routing between instruments and DUTs. Effective use of switches not only facilitates signal routing, but also increases measurement flexibility and allows for repeatable measurements. They also allow for cost-effective expansion of measurement channels without the need to purchase multiple, expensive instruments.

When adding switches to an automated test system, you have three main options:

• Design and build your own custom switch network
• Use a standalone box switch that can be controlled over GPIB or Ethernet
• Use a modular platform that incorporates one or more digital multimeters (DMMs) and other instruments

Switches are often used in conjunction with other test equipment, so tight integration with these instruments is essential. Modular, commercial off-the-shelf (COTS) switch products make this possible. This guide outlines best practices for integrating switch and multiplexer functionality into test systems.

Use this guide to understand switches and multiplexers and build a successful automated functional test system.