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Data Acquisition

Summary A practical guide to programming for data acquisition and measurement - must-have info in just the right amount of depth for engineers who are not programming specialists. Practical guidance on PC-based acquisition Written for electronic engineers and software engineers in industry, not academics or computer scientists A textbook with strong foundations in industry. Read on the Scribd mobile app Download the free Scribd mobile app to read anytime, anywhere.

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Start your free 30 days. Page 1 of 1. A data acquisition system is a collection of software and hardware that allows one to measure or control physical characteristics of something in the real world.

A complete data acquisition system consists of DAQ hardware, sensors and actuators, signal conditioning hardware, and a computer running DAQ software. A sensor , which is a type of transducer , is a device that converts a physical property into a corresponding electrical signal e.

Data Acquisition Techniques Using PC

An acquisition system to measure different properties depends on the sensors that are suited to detect those properties. Signal conditioning may be necessary if the signal from the transducer is not suitable for the DAQ hardware being used. The signal may need to be filtered or amplified in most cases. Various other examples of signal conditioning might be bridge completion, providing current or voltage excitation to the sensor, isolation, linearization.

For transmission purposes, single ended analog signals , which are more susceptible to noise can be converted to differential signals.


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Once digitized, the signal can be encoded to reduce and correct transmission errors. DAQ hardware is what usually interfaces between the signal and a PC. Usually the space on the back of a PCI card is too small for all the connections needed, so an external breakout box is required. The cable between this box and the PC can be expensive due to the many wires, and the required shielding.

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These are accessible via a bus by a microcontroller , which can run small programs. A controller is more flexible than a hard wired logic, yet cheaper than a CPU so that it is permissible to block it with simple polling loops. The device driver performs low-level register writes and reads on the hardware, while exposing API for developing user applications in a variety of programs. See also:.

Data Acquisition Techniques 4.docx - This chapter presents...

From Wikipedia, the free encyclopedia. The components of data acquisition systems include: Sensors, to convert physical parameters to electrical signals. Signal conditioning circuitry, to convert sensor signals into a form that can be converted to digital values.