Data logger

From Glossary of Meteorology
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data logger

A device deployed in the field that records weather data from one or more external sensors.

Most modern data loggers are miniature digital computers that sample the data inputs and digitize the results at regular intervals, apply preset calibrations to convert from raw voltages or currents into meteorological variables, compute statistics such as mean values and variances, and record the results either internally in memory, locally on attached storage media, or transmit the results to a remote user or computer site via telephone line or radio link. Those data loggers that record the results in memory must be periodically serviced to download the data and then clear the memory to allow new data to be stored.