In avionics, what is the function of an electronic altimeter?

An electronic altimeter functions by measuring altitude using pressure sensors, specifically barometric pressure sensors, which react to the changes in atmospheric pressure as an aircraft ascends or descends. The principle behind this is that air pressure decreases with an increase in altitude; thus, by measuring the ambient pressure, the electronic altimeter can calculate the altitude above sea level based on standardized atmospheric conditions.

This tool is crucial for flight safety, as it provides pilots with real-time altitude data necessary for navigation, air traffic control, and collision avoidance. It plays a vital role particularly in low visibility situations where visual references to terrain are minimal. The reliability and accuracy of altitude readings are essential in guiding the aircraft safely to its intended altitude for flight operations.