Describe the function of a signal isolator.

A signal isolator functions primarily to separate circuit sections to prevent interference between them. This is crucial in instrumentation and process control systems where signals from different parts of a system may interact in undesirable ways.

By isolating the signals, a signal isolator can protect sensitive components from high voltages, noise, and ground loops, ensuring that the operational integrity of the control system is maintained. This separation can originate from various sources of interference, such as electromagnetic interference or differences in ground potentials, which can cause inaccurate readings or circuit malfunctions.

Moreover, isolation can help improve overall system reliability and safety, facilitating the integration of different systems without the risk of cross-talk or other disruptive interactions. This functionality is vital in environments where various systems operate simultaneously, each potentially generating electrical noise that could disrupt the signals being measured or transmitted.

In contrast, amplifying signals enhances clarity but does not specifically address interference concerns. Increasing electrical noise would have detrimental effects on signal quality, and lowering signal generation costs does not directly relate to the isolator's main role of maintaining signal integrity through separation.