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Avionics and instruments: Difference between revisions
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→Altimeter
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=== Altimeter === | === Altimeter === | ||
[[File:Altimeter.png|right|Altmeter of default Cesna]] | [[File:Altimeter.png|right|Altmeter of default Cesna]] | ||
An '''altimeter''' is an instrument used to measure the [[altitude]] of an object above a fixed level. The measurement of altitude is | An '''altimeter''' is an instrument used to measure the [[altitude]] of an object above a fixed level. The measurement is done with an aneroid barometer. An airtight drum (the aneroid) changes shape under influence of the surrounding air pressure. The higher the altitude, the lesser the barometric pressure, the bigger the drum. This change of shape is measured and expressed in feet. However the altimeter must be calibrated during installation. During use the reading can be corrected (with a knob) for the change in air pressure caused by the weather giving a true reading. Depending on the way the altimeter is corrected it can display three different ''types'' of altitude. (More information: [[Altitude]]) | ||
The typical altimeter has two arms, like a clock. The tall arm rotates every 1000 feet, the smaller arm rotates every 10000 feet. The small scale inside the indicator is the correction indicator that can be changed with the knob. The correction is most often in Inch Hg. In in the given image the correction is set to 29.92" Hg. | |||
1" Hg = 1 one inch of mercury = 33.85 millibar = 33.85 hectoPascal | |||
=== Directional Gyro === | === Directional Gyro === | ||