Yes, several C Series modules include some level of isolation: bank isolation, channel-to-earth ground isolation, or channel-to-channel isolation. In addition, there are several bus-powered multifunction USB devices that feature isolation, including the USB-6215, USB-6216, and USB-6218.
Measurement and control applications often involve environments with hazardous voltages, transient signals, common-mode voltages, and fluctuating ground potentials capable of damaging measurement systems and ruining measurement accuracy. Isolation electrically separates sensor signals from the measurement system’s low-voltage backplane and offers many benefits including projection of equipment and user, improved noise immunity, ground loop removal, and increased common-mode voltage rejection.
NI products are UL- and CE-certified, and all isolated devices are rated based on rigorous tests for their respective measurement categories. NI isolated DAQ products meet both spacing requirements and high-potential withstand tests required for proper certification.