Data acquisition

Autonomous DAQ computer for eDge computing tAsks


Figure 11. ADA4355 evaluation board with ADA4870 for PSRR testing.

power amplifier evaluation board and the ADA4355 evaluation board. The data shown in Figure 12 was generated

by capturing data at each input frequency and looking at the power of the FFT (dBFS) at each of those frequencies. From there, the voltage level at that frequency was solved by using Equation 4:

Use the resulting VOUT_PSRR to calculate the PSRR:

ata recording, abbreviated as DAQ, or the recording of analogue signals and their conversion to

digital measurement data for further processing with software is one of the fundamental prerequisites for efficient automation and intelligent processes in ‘Smart’ factory scenarios. The new MCM- 204 is a compact, autonomous DAQ computer with four high-resolution 24 bit analogue inputs and dedicated digital outputs which, for example, can immediately be used for recording and analysing vibration signals. Data recording in ‘Smar t’ manufacturing

environments is used for identifying and collecting impor tant information, which is also necessary as a basis for management and controlling, energy-efficient use and the anticipatory servicing of automated systems. The condition and performance data for individual components for this must be recorded as signals and communicated digitally to the control system or to fur ther autonomous devices. Recording and digitalisation either takes place via several DAQ plug-in cards in larger computer architectures or more

decentralised with autonomous DAQ computers in the vicinity of the signal transmitters. The direct recording of vibrations is a typical application in order to identify the formation of bearing defects in good time and therefore warn against possible subsequent damages. The hand-sized MCM-204 in full-

Figure 12. ADA4355 PSRR results. ConClusion

Analog Devices signal chain µModule solutions integrate signal conditioning, supply generation, and passive internal components. These all-in-one, system in a package designs enable customers to quickly achieve desired, ready for market performance in a very small PCB footprint. Although signal chain µModule solutions are unmatched in ease of use, appropriate testing must be done. While the standard practices of testing PSRR can be applied, additional current drive capability is often necessary due to standard equipment limitations.

Analog Devices www.analog .com Instrumentation Monthly November 2020

aluminium casing enables 24/7 data recording of sensors with a high degree of precision and a fast scanning rate. The fanless all-in-one computer can be used immediately without an additional host computer and be integrated in existing networks via the two gigabit Ethernet interfaces. The 24 bit sigma- delta conver ter suppor ts anti-aliasing filtering, suppression of modulation and signal noise and provides a useful signal below the Nyquist rate, via which raw signals can be processed highly dynamically, for example for monitoring tasks. The integrated web console makes configuration without additional software possible, thus also enabling the impor t of application-specific filter algorithms. The MCM-204 can be ideally applied as an independent measurement system at remote field locations. The compact digital data generated via filtering and conversion can be forwarded to a central location and protocolled, visualised and fur ther processed there. The embedded PC is driven by the ARM Cor tex-A9 with 1.0 GHz. Up to four 24-bit channels, each with 128 kS/s sampling rate, are available for simultaneous sensor signal recording. The sampling rate can be adapted to the respective requirements with several levels from 1 kS/s to 128 kS/s. Data communication takes place via two GbE interfaces or an optional WLAN module in the USB sockets. A digital temperature sensor (-50 to +150 °C) with 3m connection cable is already included in the scope of delivery. With its very compact

Autonomous Ethernet DAQ computer MCM- 204 from Acceed

dimensions of 127 x 111 x 40mm, the aluminium casing is also suitable for top-hat rail assembly. The admissible ambient temperature for operation is defined with zero to 50 °C. Further technical details and information regarding application options are available directly from the German distributor Acceed.


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