The detector outputs current and a shunt resistor in the sensor cable converts the signal from current to voltage. This allows the Datalogger to directly measure the signal and to convert the signal from voltage to watts per square meter. The Net Radiometer is a high-output thermopile sensor which measures the algebraic sum of incoming and outgoing radiation. Incoming radiation consists of Direct Beam and Diffuse solar radiation plus Long-wave Irradiance from the sky. Outgoing radiation consists of Refected solar radiation plus the Terrestrial infrared radiation.
Net radiation is measured as watts per square meter.
Temperature is measured in degrees celcius and relative humidity in percent. The Wind Sentry Anemometer and Vane measure horizontal wind speed and wind direction. The anemometer cup rotation produces an AC voltage signal with a frequency directly proportional to wind speed. Wind speed is measured in meters per second. Wind vane position is transmitted by a precision conductive plastic potentiometer.