Campbell CR300 Series Product Manual page 252

generate reports from one or more weather stations.
volt meter
An inexpensive and readily available device useful in troubleshooting data acquisition sys-
tem faults.
voltage divider
A circuit of resistors that ratiometrically divides voltage. For example, a simple two-res-
istor voltage divider can be used to divide a voltage in half. So, when fed through the
voltage divider, 1 mV becomes 500 µV, 10 mV becomes 5 mV, and so forth. Resistive-
bridge circuits are voltage dividers.
volts
SI unit for electrical potential.
VSPECT®
® A registered trademark for Campbell Scientific's proprietary spectral-analysis, fre-
quency domain, vibrating wire measurement technique.
W
watchdog timer
An error-checking system that examines the processor state, software timers, and pro-
gram-related counters when the CRBasic program is running. The following will cause
watchdog timer resets, which reset the processor and CRBasic program execution: pro-
cessor bombed, processor neglecting standard system updates, counters are outside the
limits, voltage surges, and voltage transients. When a reset occurs, a counter is incre-
mented in the WatchdogTimer entry of the Status table. A low number (1 to 10) of watch-
dog timer resets is of concern, but normally indicates that the situation should just be
monitored. A large number of errors (>10) accumulating over a short period indicates a
hardware or software problem. Consult with a Campbell Scientific support engineer.
Appendix C. Glossary 239