Citizen ad2992-59p 参考指南
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English
1. How to use the Tachymeter
The most common use of a tachymeter is for
measuring the approximate speed of a
vehicle over a known distance.
e.g.) Based on how many seconds it takes a
vehicle to travel 1km or 1 mile (the available
measuring range is up to 60 seconds), the
average speed within the distance can be
calculated.
measuring the approximate speed of a
vehicle over a known distance.
e.g.) Based on how many seconds it takes a
vehicle to travel 1km or 1 mile (the available
measuring range is up to 60 seconds), the
average speed within the distance can be
calculated.
Start the chronograph when the vehicles commences travel.
1)
After the vehicle has travelled 1 km/1mile, stop the chronograph.
2)
The approximate average speed within the distance can be determined
by observing the present position of the second hand and reading the outer bezel.
Note:
The tachymeter indications may appear on dial ring, rather than on the outer
bezel (depending on model).
As shown in the illustration, it takes the vehicle 45 seconds to travel 1km or 1mi so
the approximate average speed is 80kph (50 mph).
Second hand
2. How to use the watch as a Compass
(Northern Hemisphere for instance)
The approximate direction can be
determined by comparing the position of
the hour hand to the sun. Keep in mind
that these determinations are approximate
as there is some discrepancy at different
latitudes and in different seasons.
determined by comparing the position of
the hour hand to the sun. Keep in mind
that these determinations are approximate
as there is some discrepancy at different
latitudes and in different seasons.
Lay the watch horizontally and align the hour
hand of the watch with the direction of the sun.
The middle point between the alignment of the
sun with the hour hand, and the 12 o’clock
position on the dial, approximately indicates
South.
Positioning the rotating bezel so that it points south, will then allow you to read other
approximate compass directions.
S
S
E
E
NE
N
N
W
W
SW
Twelve.
o’clock
o’clock
South
Hour
Hands
Hands
North