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Reply #139: Any comments on Hysteresis and its effect on an altimeter during... [View All]

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Kingshakabobo Donating Member (1000+ posts) Send PM | Profile | Ignore Sun Sep-10-06 11:41 AM
Response to Reply #117
139. Any comments on Hysteresis and its effect on an altimeter during...
....a rapid descent?

We have you - and your dubious Youtube profile.

And then we have LINKS from independent 3rd party sources.

http://www.tpub.com/content/aviation/14030/css/14030_45...

Hysteresis Error. Hysteresis error is a lag in altitude indication due to the elastic properties of the material within the altimeter. This occurs after an aircraft has maintained a constant altitude for an extended period of time and then makes a large, rapid altitude change. After a rapid descent, altimeter readings are higher than actual. This error is negligible during climbs and descent at a slow rate or after maintaining a new altitude for a short period of time.


HYSTERESIS:

Hysteresis results from the imperfect elasticity of aneroid capsules and springs which tend to retain a given shape even though the external forces have changed. It is present during rapid altitude changes and for a short duration thereafter. Hysteresis affects pressure altimeters.

REVERSAL ERROR:

Reversal error results from induced false static pressure sensations caused by large or abrupt pitch changes which give a momentary indication in the opposite direction. It affects pressure altimeters and vertical-speed indicators.

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