Download e-book for kindle: Practical Data Acquisition for Instrumentation and Control by John Park

By John Park

* Covers all features of the knowledge acquisition approach from layout and specification to programming, install and configuration
* supplies either the beginner and skilled consumer a high-quality figuring out of interfacing the computer and standalone tools to real-world indications from the laboratory to the commercial plant
* presents an intensive take hold of of notebook info acquisition structures and the facility to layout, specify, set up and configure and software info acquisition platforms fast and effectively

This e-book makes a speciality of info acquisition and regulate utilizing the computer and standalone tools. the computer has made a dramatic effect within the ease with which the technician, scientist and engineer this day can manage their very own attempt and dimension procedure at a remarkably cost-efficient. And this e-book goals to teach you the way effortless it really is with lots of rigorously researched details. the preferred IEEE 488 interface can also be coated. All points of the information acquisition approach are incorporated from layout and specification to programming, install and configuration. This publication supplies either the beginner and skilled consumer an exceptional seize of the rules and useful implementation of interfacing the computer and standalone tools to real-world indications from the laboratory to the economic plant. after you have learn the booklet, you've gotten a radical clutch of workstation information acquisition platforms and may have the ability to layout, specify, set up and configure and software facts acquisition structures speedy and effectively.

* Covers all facets of the knowledge acquisition process from layout and specification to programming, install and configuration
* supplies either the amateur and skilled person a superb knowing of interfacing the computer and standalone tools to real-world indications from the laboratory to the economic plant
* offers an intensive clutch of computer information acquisition platforms and the facility to layout, specify, set up and configure and software information acquisition structures quick and successfully

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Extra resources for Practical Data Acquisition for Instrumentation and Control Systems (IDC Technology (Paperback))

Example text

10 below. 10 Thermocouple measurement Its operation is based on the principle that temperature gradients in electrical conductors generate voltages in the region of the gradient. Different conductors will generate different voltages for the same temperature gradient. Therefore, a small voltage, equal to the difference between the voltages generated by the thermal gradient in each of the wires (V = VA – VB), can then be measured at the reference junction. Note that this voltage is produced by the temperature gradient along the wires and not by the junction itself.

This is where the term ‘cold junction’ was originally derived. Measure the temperature of the reference junction and add the reference junction voltage. The reference junction voltage is equal to the voltage, which would be generated by the same thermocouple if its measurement junction was at ambient temperature and its reference junction was at 0ºC. Obviously the second option is far easier to implement and has led to the design of many cold junction compensation circuits. The necessary voltage correction can be carried out with software, hardware, or a combination of both.

8% error should be seen in context with typical uncertainty in the gauge factor of ± 1%. 21, should be used to eliminate this error. In this configuration, two leads are used to provide current or voltage excitation for the completed bridge circuit, while two separate leads are used to measure the effective excitation voltage. The voltage drops caused by (RLI and RL2) will still result in the effective voltage excitation being reduced by the same amount as the three-wire half bridge configuration.

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