Tissot through 141_EN14/14, 141_EN6/14 Glossary Weather, Altimeter, Setting Altitude Presetting

T-TOUCH EXPERT

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GLOSSARY > WEATHER

Description of function

In weather mode, the hands are superimposed to

indicate the weather trend.

Explanations Weather changes are related to variations in at-

mospheric pressure. When atmospheric pressure

increases the sky clears. The area is then referred to as a "high pressure" area or "anticyclone" (A). When atmospheric pressure decreases the sky

clouds over. The area is then referred to as a "low pressure" area or "depression" (D). The T-TOUCH measures these pressure variations and indicates the weather trend with the hands, which can

adopt the following 7 positions according to the weather developments:

- 6’:	Big pressure drop, rapid deterioration
- 4’:	Moderate pressure drop,
	probable deterioration
- 2’:	Small pressure drop,
	probable slight deterioration
12 o'clock: No notable weather change
+ 2’:	Slight pressure rise,
	probable slight improvement
+ 4’:	Moderate pressure rise,
	probable improvement
+ 6’:	Big pressure rise,
	rapid improvement

The T-TOUCH program takes account of atmospheric pressure variation over the last 6 hours to calculate the trend to indicate. Furthermore, the pressure variation caused by a rapid change in altitude is detected by the watch and compensated for automatically. So it only has a minimal impact on the baro- metric trend.

The T-TOUCH digital display indicates the absolute and relative atmospheric pressure

values in hectoPascals [hPa]. Absolute at- mospheric pressure is the actual pressure at

the time and place of measurement, and can- not be altered. Relative pressure is a value relative to sea level, based on local abso- lute atmospheric pressure . Barometers and

weather charts show relative pressure values.

The relative pressure value depends on the climate zone set, and can be preset on the watch. The relative pressure presetting is in line with the altitude.

Characteristics of function

Measurement range: absolute pressure: 300 hPa to 1100 hPa

	relative pressure: 950 hPa to 1100 hPa
Accuracy:	absolute pressure: ± 3 hPa
	relative pressure: varies with altimeter
Resolution:	1 hPa
Unit conversion:	1 hectoPascal [hPa] = 1 millibar [mb]

ALTIMETER

The altitude is displayed on the digital screen for 4 hours continuously. After 4 hours, the altimeter mode is deactivated, and the date is displayed.

1 sec.

Activate glass

Altitude display

Altitude difference

display

SETTING > ALTITUDE PRESETTING

or or

Altitude display

Setting mode

:up 1 m or 3 ft

:down 1 m or 3 ft

Validate setting

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