The combination of the active element, wire, and system electronics is called a ______.

• A. Channel
• B. Assembly
• C. Module
• D. Subsystem

Answer: (A)

A channel describes the full signal path from the sensing element through the wiring to the system electronics. It encompasses the active element that converts a physical quantity into an electrical signal, the connecting cable, and the conditioning and processing electronics that adapt the signal for the rest of the system. This term is used to refer to a single measurement path in an instrument, with its own characteristics like gain and filtering, separate from other parts of the device.

That’s why it fits here: the combination of the active element, wire, and system electronics forms one complete signal path—the channel. An assembly is just parts put together, a module is a self-contained functioning unit, and a subsystem is a larger portion of the overall system, potentially containing multiple channels.