Campbell Scientific CR200X CR200/CR200X-series Dataloggers - Page 184
Volts Direct Current. The CR200X operates with a nominal 12 VDC
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Appendix A. Glossary VAC Volts Alternating Current. Mains or grid power is high-level VAC, usually 110 VAC or 220 VAC at a fixed frequency of 50 Hz or 60 Hz. High-level VAC is used as a primary power source for Campbell Scientific power supplies. Do not connect high-level VAC directly to the CR200(X). The CR200(X) measures varying frequencies of low-level VAC in the range of ±20 VAC. VDC Volts Direct Current. The CR200(X) operates with a nominal 12 VDC power supply. It can supply nominal 12 VDC and variable excitation in the 5 VDC and 2.5 VDC range. It measures analog voltage in the 0 - 2.5 VDC range and pulse voltage in the ±20 VDC range. volt meter An inexpensive and readily available device useful in troubleshooting data acquisition system faults. Volts SI unit for electrical potential. watch dog 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. 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 error 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. See WatchdogErrors p. 151 for more information. weather tight Describes an instrumentation enclosure impenetrable by common environmental conditions. During extraordinary weather events, however, seals on the enclosure may be breached. XML Extensible Markup Language. 12