Test & Measurement


Data-loggers offer USB support

14 May 2008 Test & Measurement

National Instruments has announced four new 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 to the C Series while the NI 9234 AC/DC-coupled dynamic signal acquisition module offers selectable IEPE signal conditioning for engineers measuring high-accuracy audio frequency.

The C Series combines signal conditioning, direct sensor connectivity and data acquisition into a small module for each measurement type that can be inserted into any C Series chassis to create a variety of systems. There are more than 40 C Series modules available for different measurements including thermocouple, voltage, RTD, current, resistance, strain, digital (TTL and other), accelerometers and microphones. The new modules are enhanced with the inherent data acquisition and analysis features of LabVIEW software.

The bus-powered USB-9219, USB-9229 and USB-9239 are designed for multipurpose testing in any NI CompactDAQ or CompactRIO chassis, or with the NI USB-9162 single module carrier. With the new USB-9219 universal module, engineers can measure up to 11 types of signals from sensors such as strain gauges, RTDs, thermocouples and load cells. With channel-to-channel isolation, an entire system, including the device under test, is protected from harmful voltage spikes up to the isolation rating. In addition to safety, isolation eliminates measurement errors caused by ground loops.

Measurement ranges for the USB-9219 include up to ±60 V and ±25 mA, making it ideal for in-vehicle data-logging applications that often require 12 or 42 V of measurement range. The USB-9229 and USB-9239 high-speed data-logging modules acquire 50 kSps per channel and include anti-aliasing filters to eliminate unwanted signals for monitoring applications such as structural health, machine conditioning, electrical power and environmental monitoring. The USB-9239 operates at ±10 V for precise, high-speed sensor measurement, while the USB-9229 operates at ±60 V for sensors with a higher output range such as proximity probes used for vibration data-logging.

The NI 9234 dynamic signal acquisition module is ideal for vibration and acoustical data-logging because engineers can turn on or off IEPE conditioning as well as select AC or DC coupling. The module delivers 24 bits of resolution, 102 dB of dynamic range and anti-aliasing filters. It can be used with the NI Sound and Vibration Measurement Suite, which includes the Sound and Vibration Assistant to simplify acquiring and analysing noise and vibration signals by offering a standalone, interactive analysis and acquisition environment. The standalone software makes it possible to continually interact with varying data analysis settings while logging data to disk for future analysis.

For more information contact National Instruments, 0800 203 199, sales@natinst.co.za, www.ni.com/southafrica





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