So far, we've been able to handle any type of signal with a DI or SE input configuration except those with CMVs that exceed the full scale resolution of the DAS input. Handling this signal type is the domain of isolation. Isolation is an option for any instrumentation application but it's an absolute necessity under these conditions. The presence of isolation ensures that absolutely no connection exists between the ground of the computer and that of the signal. If your instrumentation applications frequently require isolation, the ideal solution is a data acquisition system with built in isolation.
Isolation ensures a noise-free and safe environment for industrial data acquisition.
A final note regarding the need for isolation revolves around patient-connected measurements in life sciences applications. Any measurement involving the connection of an instrument to a human body requires medical-grade isolation to ensure the safety of the subject. I hope the concepts presented in this article have enhanced your understanding of how a DAS can be applied in a variety of instrumentation settings. Perhaps I've even given you some ideas on how to attack a particularly nagging problem. Far too often, little details like input configuration are overlooked, resulting in frustrating or even disastrous results.