Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 471

Section 11. Glossary 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. 528). A low number (1 to 10) of watchdog timer resets is of concern, but normally indicates the user should just monitor the situation. A large number (>10) of errors accumulating over a short period of time should cause increasing alarm since it indicates a hardware or software problem may exist. When large numbers of watchdog‐timer resets occur, consult with a Campbell Scientific applications engineer. weather tight Describes an instrumentation enclosure impenetrable by common environmental conditions. During extraordinary weather events, however, seals on the enclosure may be breached. Web API Application Programming Interface (see section Web API, for more information). Glossary. Wild Card a character or expression that substitutes for any other character or expression. XML Extensible markup language. User Program The CRBasic program written by the CR1000 user in CRBasic Editor or Short Cut. 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 471