Campbell Scientific CR6 CR6 Measurement and Control System - Page 71
Cabling Effects - Overview, Synchronizing Measurements - Overview, Datalogger - Overview
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Section 5. System Overview 5.1.8 Cabling Effects - Overview Reading List: • Cabling Effects - Overview (p. 71) • Cabling Effects - Details (p. 367) Sensor cabling can have significant effects on sensor response and accuracy. This is usually only a concern with sensors acquired from manufacturers other than Campbell Scientific. Campbell Scientific sensors are engineered for optimal performance with factory-installed cables. 5.1.9 Synchronizing Measurements - Overview Reading List: • Synchronizing Measurements - Overview (p. 71) • Synchronizing Measurements - Details (p. 368) Timing of a measurement is usually controlled relative to the CR6 clock. When sensors in a sensor network are measured by a single CR6, measurement times are synchronized, often within a few milliseconds, depending on sensor number and measurement type. Large numbers of sensors, cable length restrictions, or long distances between measurement sites may require use of multiple CR6s. 5.2 Datalogger - Overview Reading List: • Datalogger - Quickstart (p. 37) • Datalogger - Overview (p. 71) • Dataloggers - List (p. 595) The CR6 datalogger is the principal component of a data-acquisition system. It is a precision instrument designed for demanding environments and low-power applications. CPU, analog and digital measurements, analog and digital outputs, and memory usage are controlled by the operating system, the on-board clock, and the CRBasic application program you write. The application program is written in CRBasic, a programming language that includes measurement, data processing, and analysis routines and a standard BASIC instruction set. Short Cut (p. 508), a very user-friendly program generator software application, can be used to write programs for many basic measurement and control applications. CRBasic Editor, a software application available in some datalogger support software (p. 493) packages, is used to write more complex programs. Measurement data are stored in non-volatile memory. Most applications do not require that every measurement be recorded. Rather, measurements are usually combined in statistical or computational summaries. The CR6 has the option of evaluating programmed instructions sequentially (sequential mode), or in the more efficient pipeline mode. In pipeline mode, the CR6 determines the order of instruction execution. 71
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