Campbell CR850, Operator'S Manual

Page: 448 / 566

Section 11. Glossary
448
Volts
SI unit for electrical potential.
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
WatchdogTime r entry of the Status table
(p.
506
).
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 CR800 user in CRBasic Editor or
Short Cut .