Barometric Altimeter USSR Military aircraft, cockpit, pilot. Aircraft instruments.

Good condition, tested.

Barometric altimeter is a device that measures atmospheric pressure to determine absolute and relative altitudes. It is known that atmospheric pressure decreases with increasing altitude.

Operating principle of a barometric altimeter:

A barometric altimeter determines, mainly, not the altitude, but the current atmospheric pressure. The altitude is determined by the principle that with an increase in the altitude indicator, atmospheric pressure decreases proportionally. The advantages of a barometric altimeter compared to a satellite altimeter are that its operation does not depend on a satellite signal. In addition, a satellite altimeter uses a conventional model of the Earth (usually WGS 84) to determine the zero mark, which can give an error in readings in local areas of the terrain.