Data acquisition
application envisaged, there are an extensive variety of solutions now available on the market that can be considered — these span from relatively unsophisticated plug-and- play data loggers right through to highly integrated, multi-function DAQ systems. In the following article, we will look at each of these solution types in turn.
CompaCt portable Data loggers for speCialty appliCations The USB-4700 series from Advantech comprises DAQ modules that can be installed without opening the chassis. The user just plugs them in to access collected data. Reliable and rugged enough for industrial deployment, yet sufficiently affordable for home systems, these modules simplify the process of adding control and measurement facilities to USB- capable computers. The company’s USB-4716 offers 16 single-ended/ eight differential analogue inputs with 16-bit resolution, up to 200kSamples/s throughput, 16 digital I/Os, one user counter and two 16- bit analogue outputs. Additionally, because it draws power from the computer via the USB port, no external power connection is required. MonoDAQ’s DAQ instruments interface with any sensors for mechanical measurements for strain and structural loads or acceleration. They transfer data over EtherCAT to a PC running the powerful and easy- to-use DEWESoft DAQ software. The MonoDAQ-E-STG isolated strain gauge amplifier can acquire data from strain gauges and load cells using any bridge configuration, programmable excitation, and extremely low noise. It has a 100mV to 50V range and a 20mA current input (internal shunt). Complementing this is the MonoDAQ-E-gMeter, which is an all- in-one sensor and DAQ device with a very low noise three-axial MEMS accelerometer for bridge or antenna structural monitoring and seismic measurements. Power and signal over the same cable allow it to be distributed throughout any structure requiring acceleration monitoring. Conversely, the MonoDAQ-E-ACC acceleration sensor amplifier is aimed at high precision vibration measurements and provides high degrees of signal conditioning for integrated electronic piezoelectric (IEPE) sensors. Typical applications include machine vibration monitoring, bearing fault detection, and modal
structural analysis.
Extech Instruments’ operationally straight forward RHT35 USB humidity, temperature, and barometric pressure data logger records information with a date/time stamp and can transfer up to 48,000 readings to a PC (in either PDF or spreadsheet format). It also includes an eight-location logger bookmark, six language options, programmable sampling interval, adjustable alarm, and password-protected security log- in. Meanwhile, the company’s VB300 is a G-force logging unit records and times three-axis shock and vibration (acceleration) readings over its ±18g measurement range. It records three- axis G-forces and related peaks to provide a history of shock and vibration conditions for applications such as monitoring freight containers during transportation. It has a USB interface to facilitate set-up and data download, plus it comes with a magnetised/bolt-on mounting base, a 3.6V Lithium battery, and Windows- compatible analysis software. Midé’s Slam Stick products are
high-speed ultra-portable rechargeable data loggers capable of measuring acceleration in all three axes, in addition to pressure and temperature. The devices use a USB or micro-USB port for on-the-fly configuring, charging and downloading of data. Configuration options include an adjustable delay time before each measurement, different measurement durations
Instrumentation Monthly March 2019
and a trigger based on a pre- determined acceleration level. Light enough to be mounted or attached using double-sided tape, they can be employed in energy harvesting vibration characterisation, modal surveys, and equipment monitoring.
integrateD, multi- funCtion DaQ systems ADLINK’s USB DAQ modules provide ease of connectivity with plug-and-play hardware/software, cost-effectiveness, and convenience, but without compromising on accuracy. They include the USB-2405 dynamic signal acquisition (DSA) USB module, USB-7230/7250 isolated USB I/O modules, USB-1210 DAQ module 4-CH, USB-2401 universal input USB DAQ module, and USB- 1901/1902/1903 8/16-CH 16-bit 250kS/s multi-function USB DAQ modules. The company also provides a wide range of industrial-grade computer and PXI platforms enabling customers to choose the products most suitable to their audio and vibration applications. Based on various bus standards, the DSA modules are specifically designed for audio, noise, and vibration measurement applications in machine condition monitoring. Exhibiting up to 432kSamples/s sampling rates, 24-bit resolution, and IEPE signal conditioning, the series delivers highly accurate acquisition and trouble-free connection to microphones or accelerometers for component
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The ADLINK USB-2401
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