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Practical Data Acquisition using Personal Computers and Standalone Systems

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Objectives

• To Review:– PC-based data acquisition.– Examine installation of PC-based data acquisition

systems.

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Fundamentals of Data Acquisition

• Sensors and Transducers

• Field Wiring

• Signal Conditioning

• Data Acquisition Hardware

• PC (Operating System)

• Data Acquisition Software

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Transducers and Sensors

• Electrical Signals are acquired using different devices:– Strain Gauges– RTD’s – Thermocouples– Thermistors– Flow Meters

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Field & Communications Cabling

• Physical connection from transducers and sensors to signal conditioning hardware/data acquisition hardware.

• Susceptible to noise (Good earthing & shielding vital).

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PC Based Data Acquisition

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Signal Conditioning

• Principle Tasks here:– Amplification – Filtering– Linearisation– Isolation– Excitation

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Data Acquisition Hardware

• Input, processing and conversion to digital format using analog to digital converters.

• Input of digital signals.

• Digital signals in PC to analog outputs.

• Output of digital signals.

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Data Acquisition Software

• Three options here:– Program registers

directly.– Utilize low level driver

software– Off the shelf

application software

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Host Computer• Various buses

– ISA– EISA– PCI

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Some typical configurations:

• Computer Plug-in

• Distributed I/O

• Stand-alone IEEE 488

• Data Logger

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Computer Plug-in

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Distributed I/O

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Memory cards and standalone

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Direct Connection to Logger

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Remote Connection to Logger

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Distributed Logger Network

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Typical IEEE 488

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PC Based Data Acquisition

• High Speed

• Low cost

• Not as reliable as loggers

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DO YOU WANT TO KNOW MORE?

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