By John Park ASD, Steve Mackay CPEng BSc (ElecEng) BSc (Hons) MBA
* Covers all elements of the information acquisition procedure from layout and specification to programming, install and configuration * supplies either the beginner and skilled consumer an exceptional knowing of interfacing the computer and standalone tools to real-world indications from the laboratory to the economic plant * offers a radical seize of computer facts acquisition structures and the facility to layout, specify, set up and configure and application info acquisition structures quick and successfully This e-book specializes in information acquisition and keep an eye on utilizing the computer and standalone tools. the computer has made a dramatic impression within the ease with which the technician, scientist and engineer at the present time can manage their very own try out and dimension process at a remarkably low-budget. And this e-book goals to teach you the way effortless it's with lots of conscientiously researched info. the preferred IEEE 488 interface can also be lined. All points of the information acquisition procedure are incorporated from layout and specification to programming, install and configuration. This e-book offers either the amateur and skilled consumer a superior snatch of the rules and useful implementation of interfacing the computer and standalone tools to real-world indications from the laboratory to the economic plant. upon getting learn the booklet, you've got an intensive take hold of of computer info acquisition platforms and should be capable of layout, specify, set up and configure and application facts acquisition structures speedy and successfully. * Covers all features of the knowledge acquisition method from layout and specification to programming, deploy and configuration * offers either the amateur and skilled person a pretty good figuring out of interfacing the computer and standalone tools to real-world indications from the laboratory to the economic plant * presents an intensive clutch of computing device info acquisition platforms and the facility to layout, specify, set up and configure and software information acquisition platforms quick and successfully
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Sample text
This configuration eliminates the voltage drops caused by excitation current through the lead resistances (RL1 and RL4). Since negligible current flows in the voltage lead resistances, (RL2 and RL3) only the voltage drop across the resistance RT of the RTD is measured. Three-wire RTD measurement A reduction in cost is possible with the elimination of one of the wire leads. 9, only one lead RL1 adds an error to the RTD voltage measured. 9 Three-wire RTD measurements Self-heating Another consequence of current excitation of the RTD is the possible effect that internal heating of the device may have on the accuracy of the actual temperature measurements 22 Practical Data Acquisition for Instrumentation and Control Systems being made.
As an example, an RTD’s excitation current can result in self-heating of the device, thereby changing its resistance. 1 Characteristics of RTDs Resistance temperature detectors (RTDs) are temperature sensors generally made from a pure (or lightly doped) metal whose resistance increases with increasing temperature (positive resistance temperature coefficient). Most RTD devices are either wire wound or metal film. Wire wound devices are essentially a length of wire wound on a neutral core and housed in a protective sleeve.
However, since negligible current flows in the lead resistances (RL3 and RL4), the effective excitation voltage can be accurately measured (VEXM). 22, both a single active element and matching completion resistor must be provided external to the signal conditioning equipment. 22 Three-wire quarter bridge circuit wiring configuration In this configuration, the lead resistances (RL1 and RL2) appear in opposite arms of the left-hand side of the bridge and therefore have little effect on the bridge balance.
