The Agilent 34972A is designed to support a variety of 34970A plug-in modules. Users can easily and quickly integrate the instrument into a test using simple address change. Integration of the 34972A into existing tests using this approach requires no hardware changes or wiring. The plug-in modules contain relay closure count and on-board screw terminals, which allow operators to create compact data logger with ease. By using this technique, a user obtains a low-cost switching unit or full-featured data acquisition unit that can be easily configured, connected, and used either on the bench, in field applications, or on a network.