Data acquisition
The Keysight DAQ970A
testing. Each unit is equipped with four analogue input channels providing simultaneous sampling at up to 128kSamples/s per channel. Also featured is software-selectable AC or DC coupling input configuration and built-in high precision 2mA excitation, as well as very low-temperature drift. Onboard 24-bit sigma-delta ADCs
enables anti-aliasing filtering - thereby suppressing modulator and out-of- band signal noise and providing usable signal bandwidth of the Nyquist rate. This makes these modules suitable for high dynamic range signal measurement in vibration and acoustic applications. They support digital and analogue trigger sources and flexible trigger modes (including post, delay, middle, gated and pre-triggering) for efficient data acquisition with no need for post-processing. The USB-2401 is a 24-bit, four-
channel simultaneous-sampling universal input USB DAQ module, with integrated signal conditioning circuitry, that provides a direct measurement of commonly used sensors, like current output transducers, thermocouples, RTDs, load cells, and strain gauges. Individual channels can be programmed to measure different signal types. The unit is equipped with removable screw-down terminals for easy device connectivity, and a multi-functional
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stand supports desktop, rail, or wall mounting. This DAQ is suitable for basic measurement applications requiring high levels of resolution and accuracy. It can be utilised in both laboratory research and material testing environments, as well as for industrial temperature measurement. U-test, a free ready- to-use software package, is included to enable testing of all key functions without any programming requirement. Keysight’s DAQ970A is a next-
generation DAQ system that provides higher performance and flexibility while maintaining compatibility with the company’s popular 34970A and 34972A models. The system measures and converts 12 different input signals - such as temperature with thermocouples, RTDs and thermistors, DC and AC voltages, two- and four- wire resistance, frequency and period, capacitance and strain. Its three-slot mainframe has a built-in 6.5 digit DMM and signal conditioning that speeds up test development time. Compared to its predecessor, it reaches 2x the scan rate speed and up to 450 channels/s which is ten times faster. It can measure
very low current ranges (1μAAC to 100μAAC) and at high resistances (up to 1,000MΩ) with 90 per cent better
accuracy for voltage, current and resistance measurement. It comes with an auto-calibration feature that compensates the internal DMM.
Future ProsPects For DAQ
Factors such as increasing industrial automation requirements, rising investments in infrastructure and renewable energy power plants are all helping to drive the growth of the DAQ market. Global Industry Analysts forecasts that the value of the worldwide DAQ market will reach $1.7 billion by 2022 due to the strong emphasis being placed on IIoT and Industry 4.0 implementation, as well as the shortened time-to-market expectations now being seen in the manufacturing industry (especially within the automotive sector). Similarly, Market Insights has projected a CAGR of 6.04 per cent in DAQ between now and the start of 2026, with the market reaching a total annual worth of $3.61 billion by the end of that period. Clearly, with the need for access to larger quantities of data from a broader array of different sources, having suitable technology to undertake such work will be paramount. This will only encourage further product introductions in the DAQ arena and lead to continued engineering innovation - with performance benchmarks being pushed to their limits and effort being made to ensure that price points are attractive as possible.
Mouser Electronics
www.mouser.com
March 2019 Instrumentation Monthly
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