Data acquisition

Data acquisition (DAQ) is a process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numeric values that can be manipulated by a host. The components of a typical DAQ system include: signal conditioning circuitry to convert sensor signals into a form that can be converted to digital values,  analog-to-digital converters, which convert conditioned sensor signals to digital values and a bus used to connect to a host system that in most cases is a personal computer.


Hardware description

An USB DAQ interface has been developed with 8-channel 16-bit differential analog input stage capable of sample rates up to 250 000 samples per second. The interface also includes a four channel D/A converter with 12 bit resolution suitable for generating DC bias voltages and slow AC signals. The interconnecting bus is USB 2.0 full-speed compliant. Input and output voltage range is 5 V or 10 V but can be further customized upon request.

Technical specifications (for 10 V version)





A/D converter

differential input voltage range

±10 V

absolute input voltage range

10 V

absolute maximum input voltage

12 V

sampling rate

1 Hz

250 kHz

input noise

±2 LSB

CMRR @ 1 kHz

60 dB

CMRR @ 80 kHz

46 dB

D/A converter

output voltage range

0 V

10 V

output accuracy

±3% FSO

output noise

±4 mVpp



Software support includes the following Microsoft operating systems: Windows XP, Windows Vista and Windows 7. The DAQ interface can be used in any Windows development environment, Matlab or any other software capable of importing and using functions from a dll library. Furthermore a complete driver interface is available for the NI LabView software package.



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