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National Instruments has announced four additions to its C series modules for data-logging applications, including vibration/acoustical data logging and in-vehicle, structural, temperature and pressure testing. The USB-9219, USB-9229 and USB-9239 provide USB, bus-powered connectivity, while the 9234 AC/DC-coupled dynamic signal-acquisition module offers selectable IEPE signal conditioning for engineers who need to measure high-accuracy audio frequency. The series combines signal conditioning, direct sensor connectivity and data acquisition into a small module for each measurement type; this module can be inserted into the chassis to create a variety of systems. There are now more than 40 C series modules available for different measurements, including thermocouple, voltage, RTD, current, resistance, strain, digital - such as TTL -, accelerometers and microphones.