Tissot 141_EN5/14 - Manual (Page 9)

www.tissot.ch 141_EN 9/14
T-TOUCH EXPERT
*
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.
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
Description of function
In altimeter mode, your T-TOUCH becomes a baro-
metric altimeter, displaying the altitude relative to
mean sea level.
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 T-TOUCH
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.
GLOSSARY > ALTIMETER
Weather change = pressure variation = displayed altitude change
4473 m 4473 m 4473 m
Measurement range – 400 m to +9000 m – 1333 ft to +30,000 ft
Altimeter resolution 1 m 3 ft
Unit conversion
1 metre [m] =
3.281 feet [ft]
1 foot [ft] =
0.305 metres [m]
Altitude difference meter
max. measurement time
9 days 23 hours 59 minutes
Maximum altitude difference +/- 30,000 m +/- 99,000 ft
Altitude difference meter
resolution
1 m 3 ft
Maximum vertical speed
4999 m/min
(appr. 300 km/h)
16,401 ft/min
(appr. 187.5 mph)
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
GLOSSARY > ALTIMETER
Altitude difference
display
Elapsed time or stopped time
Back: Elapsed time or stopped time Total cumulative loss in altitude
during elapsed time
Mean vertical speed of descent
(metres/minute or feet/minute)
Total cumulative gain in altitude
during elapsed time
Mean vertical speed of descent
(metres/minute or feet/minute)
2 sec.
2 sec.
Start Altitude difference meter Stop Altitude difference meter Reset Altitude difference meter
2 sec.
Sequentiallly every 2 seconds
2 sec.
2 sec.
2 sec.