Practical Data Acquisition using Personal Computers and Standalone Systems
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Transcript of Practical Data Acquisition using Personal Computers and Standalone Systems
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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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