altimeter

An instrument to indicate the height of an aircraft above a predetermined datum, normally sea level. Specifically, an instrument similar to an aneroid barometer that utilizes the change of atmospheric pressure with altitude to indicate the approximate elevation above a given point or plane used as a reference. A simple pressure altimeter is an airtight metal case, the interior of which is kept at atmospheric pressure by a tube connecting it to the static tube of the ASI (airspeed indicator). Inside the instrument case, a partially evacuated aneroid capsule is secured at the center of one of its faces to a base rigidly fixed to the casing. A leaf spring prevents the collapse of the capsule. The capsule expands as aircraft gains height. The expansion of the capsule is converted into height through a system of gears. A pressure altimeter suffers from barometric, temperature, instrument, and lag errors. Radio or radar altimeters indicate heights above ground level.

Aviation dictionary. 2014.

Look at other dictionaries:

  • Altimeter — Al*tim e*ter, n. [LL. altimeter; altus high + metrum, Gr. ?, measure: cf. F. altim[ e]tre.] An instrument for taking altitudes, as a quadrant, sextant, etc. Knight. [1913 Webster] …   The Collaborative International Dictionary of English

  • altimeter — (n.) 1918, from Mod.L. altimeter, from alti high (from L. altus; see OLD (Cf. old)) + METER (Cf. meter) …   Etymology dictionary

  • Altimĕter — (v. lat. u. gr.), Höhenmesser, u. Altimetrie, Höhenmessung (s. b.); daher Altimetrisch, was sich auf Höhenmessung bezieht …   Pierer's Universal-Lexikon

  • Altimēter — (lat. gr.), Werkzeug zur Höhenmessung; Altimetrie, Höhenmessung. S. Meßinstrumente …   Meyers Großes Konversations-Lexikon

  • Altimeter — ist neuerdings in England (von den Verfertigern Newton Co., London) ein zur barometrischen Höhenmessung bestimmtes Aneroid (Naudetscher Konstruktion, vgl. Aneroid und Federbarometer) genannt worden, ebenso werden von mehreren französischen Firmen …   Lexikon der gesamten Technik

  • Altimeter — Altimēter (lat. grch.), Höhenmesser; Altimetrīe, Höhenmessung …   Kleines Konversations-Lexikon

  • Altimeter — Altimeter, Höhenmesser, ungew. Ausdruck …   Herders Conversations-Lexikon

  • altimeter — ► NOUN ▪ an instrument which indicates the altitude reached, especially in an aircraft …   English terms dictionary

  • altimeter — [al tim′ət ər; ] also [ al′tə mēt΄ər] n. [ ALTI + METER] an instrument for measuring height above a given reference level, as the sea or ground: in aircraft it is either an aneroid barometer with a dial marked in feet or meters or an instrument… …   English World dictionary

  • Altimeter — An altimeter is an instrument used to measure the altitude of an object above a fixed level. The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth underwater. Aircraft Instrumentation… …   Wikipedia

  • Altimeter — Ein Altimeter (von lat. altus: hoch) oder Höhenmesser ist ein Gerät, mit dem die Höhe eines Objekts über einer definierten Ebene oder Referenzfläche gemessen wird. Die Höhenmessung kann barometrisch, mit Schall, mit Mikrowellen (Radar) oder mit… …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.