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Practical Data Acquisition using Personal Computers and Standalone Systems


Objectives

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

systems.


Fundamentals of Data Acquisition

• Sensors and Transducers

• Field Wiring

• Signal Conditioning

• Data Acquisition Hardware

• PC (Operating System)

• Data Acquisition Software


Transducers and Sensors

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


Field & Communications Cabling

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

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


PC Based Data Acquisition


Signal Conditioning

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


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.


Data Acquisition Software

• Three options here:– Program registers

directly.– Utilize low level driver

software– Off the shelf

application software


Host Computer• Various buses

– ISA– EISA– PCI


Some typical configurations:

• Computer Plug-in

• Distributed I/O

• Stand-alone IEEE 488

• Data Logger


Computer Plug-in


Distributed I/O


Memory cards and standalone


Direct Connection to Logger


Remote Connection to Logger


Distributed Logger Network


Typical IEEE 488


PC Based Data Acquisition

• High Speed

• Low cost

• Not as reliable as loggers


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