T-TOUCH EXPERT
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GLOSSARY > ALTIMETER
Altitude difference
display
Sequentiallly every 2 seconds
| 2 sec. |
| 2 sec. |
Elapsed time or stopped time |
| Total cumulative gain in altitude | Mean vertical speed of descent |
|
| during elapsed time | (metres/minute or feet/minute) |
2 sec. | 2 sec. |
| 2 sec. |
Total cumulative loss in altitude |
| Mean vertical speed of descent | Back: Elapsed time or stopped time |
during elapsed time |
| (metres/minute or feet/minute) |
|
2 sec.
Start Altitude difference meter
Stop Altitude difference meter
Reset Altitude difference meter
GLOSSARY > ALTIMETER
Description of function
In altimeter mode, your
Explanations
This is a barometric instrument, which calculates the altitude as a function of absolute pressure
(atmospheric). As the altitude rises, pressure drops, and vice versa. So the altimeter meas- ures the difference between absolute pressure (atmospheric) and relative pressure (relative to sea level) to display the altitude. Your
is temperature compensated, and you can adjust
your geographic location (hemisphere and climate zone). The altitude dis- played is therefore corrected automatically.
This makes it the ideal instrument for measuring vertical movement with the altitude difference function (e.g. in mountain trekking). The altitude difference meter indicates the elapsed time, cumulative gains and losses in altitude and mean vertical speeds of ascent and descent.
NB!
Due to the use of pressure to calculate altitude, the altimeter is sensitive to variations in atmospheric pressure in weather changes. It is not uncommon to observe altitude differences of 100 m in a night. So the value displayed may vary without the altitude having actually changed.
4473 m | 4473 m | 4473 m |
Weather change = pressure variation = displayed altitude change
We advise you to stop the altitude difference meter during rest times and then restart it, in order to obtain more accurate results.
Note 1: "Presetting" an altimeter means setting
the actual altitude of a known point (see preset- ting procedure on page 8). The actual altitude values are indicated on various media: signposts, contour lines and spot heights on maps. The al-
titude "presetting" is in line with relative atmos- pheric pressure.
Note 2: In an airliner, since the cabin is pressur-
ised, your altimeter will not indicate an accurate altitude.
Note 3: To optimise the accuracy of your altimeter, you are advised to select the climate zone, see page 6.
Characteristics of function
Measurement range | – 400 m to +9000 m | – 1333 ft to +30,000 ft | |
Altimeter resolution | 1 m | 3 ft | |
Unit conversion | 1 metre [m] = | 1 foot [ft] = | |
3.281 feet [ft] | 0.305 metres [m] | ||
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Altitude difference meter | 9 days 23 hours 59 minutes | ||
max. measurement time | |||
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Maximum altitude difference | +/- 30,000 m | +/- 99,000 ft | |
Altitude difference meter | 1 m | 3 ft | |
resolution | |||
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Maximum vertical speed | 4999 m/min | 16,401 ft/min | |
(appr. 300 km/h) | (appr. 187.5 mph) | ||
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Minimum vertical speed | 5 m/min (appr. 0.3 km/h) | 16.4 ft/min (appr. 0.2 mph) | |
Vertical speed resolution | 1 m/min | 3 ft/min | |
Minimum vertical movement | 5 m | 16 ft | |
Minimum time of movement | 5 mins |
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