Campbell Scientific CR6 CR6 Measurement and Control System - Page 35
System Quickstart
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4. System Quickstart Reading List • Quickstart (p. 35) • Specifications (p. 91) • Installation (p. 103) • Operation (p. 305) This tutorial presents an introduction to CR6 data acquisition and a practical programming and data retrieval exercise. 4.1 Data-Acquisition Systems - Quickstart Reading List: • Data-Acquisition Systems - Quickstart (p. 35) • Data-Acquisition Systems - Overview (p. 56) Acquiring data with a Campbell Scientific datalogger is a fairly defined procedure involving the use of electronic sensor technology, the CR6 datalogger, a telecommunication link, and datalogger support software (p. 493) A CR6 is only one part of a data-acquisition system. To acquire good data, suitable sensors and a reliable data-retrieval method are required. A failure in any part of the system can lead to "bad" data or no data. A typical data-acquisition system is conceptualized in figure Data-Acquisition System Components (p. 36) Following is a list of typical system components: • Sensors (p. 36) - Electronic sensors convert the state of a phenomenon to an electrical signal. • Datalogger (p. 37) - The CR6 measures electrical signals or reads serial characters. It converts the measurement or reading to engineering units, performs calculations, and reduces data to statistical values. Data are stored in memory to await transfer to a PC by way of an external storage device or a telecommunication link. • Data Retrieval and Telecommunications (p. 39) - Data are copied (not moved) from the CR6, usually to a PC, by one or more methods using datalogger support software. Most of these telecommunication options are bi-directional and so allow programs and settings to be sent to the CR6. • Datalogger Support Software (p. 40) - Software retrieves data and sends programs and settings. The software manages the telecommunication link and has options for data display. • Programmable Logic Control - Some data-acquisition systems require the control of external devices to facilitate a measurement or to control a device based on measurements. The CR6 is adept at programmable logic control. Unfortunately, there is little discussion of these capabilities in this manual. Consult CRBasic Editor Help (p. 127) or a Campbell Scientific Application Engineer for more information. • Measurement and Control Peripherals (p. 81) - Some system requirements exceed the standard input or output compliment of the CR6. Most of these requirements can be met by addition of input and output expansion modules. 35
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