Wind vane position is transmitted by a precision conductive plastic potentiometer. The output signal is an analog voltage directly proportional to the wind direction azimuth angle. The Tipping Bucket Rain Gauge is an adaptation of the standard Weather Service tipping bucket rain Gauge. Output is a switch closure for each bucket tip. A multiplier in the datalogger program determines the units in which rainfall is reported.
Rainfall is measured in millimeters.
Barometric pressure is calculated from the measured output voltage using a simple equation. Pressure measurements are reduced to sea level. Barometric pressure is reported in millibars. The data logger is accessed with a portable computer. The data logger must be programmed before it will make any measurements.