Campbell Scientific CR6 CR6 Measurement and Control System - Page 513
Concepts, 2.1 Accuracy, Precision, and Resolution
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Section 11. Glossary domain, vibrating-wire measurement technique. Term. watchdog timer An error-checking system that examines the processor state, software timers, and program-related counters when the datalogger is running its program. If the processor has bombed or is neglecting standard system updates or if the counters are outside the limits, the watchdog timer resets the processor and program execution. Voltage surges and transients can cause the watchdog timer to reset the processor and program execution. When the watchdog timer resets the processor and program execution, an error count is incremented in the WatchdogTimer entry of the Status table (p. 581). A low number (1 to 10) of watchdog timer resets is of concern, but normally indicates that the situation should just be monitored. A large number (>10) of errors accumulating over a short period indicates a hardware or software problem may exist. When large numbers of watchdog-timer resets occur, consult with a Campbell Scientific application engineer. Term. weather-tight Describes an instrumentation enclosure impenetrable by common environmental conditions. During extraordinary weather events, however, seals on the enclosure may be breached. Term. web API Application Programming Interface (see the section Web Service API (p. 418), for more information). Term. wild card a character or expression that substitutes for any other character or expression. Term. XML Extensible markup language. Term. user program The CRBasic program written by the CR6 user in CRBasic Editor or Short Cut program generator. 11.2 Concepts 11.2.1 Accuracy, Precision, and Resolution Three terms often confused are accuracy, precision, and resolution. Accuracy is a measure of the correctness of a single measurement, or the group of measurements in the aggregate. Precision is a measure of the repeatability of a group of measurements. Resolution is a measure of the fineness of a measurement. Together, the three define how well a data-acquisition system performs. To understand how the three relate to each other, consider "target practice" as an analogy. Figure Accuracy, Precision, and Resolution (p. 513) shows four targets. The bull's eye on each target represents the absolute correct 513
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