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10
20
30
Please note that the tachymeter scale can be used only when the time required is
less than 60 seconds. If it exceeds 60 seconds, shorten the measuring distance.
(Refer to “Ex. 2” below.)
13
Ex.: 1)
If it takes 40 seconds to go one kilometer (or one mile), the
stopwatch second hand indicates “90” on the tachymeter
scale. This means that the average speed of the vehicle is
90 kilometers (or miles) per hour.
Use the stopwatch to determine how many seconds it takes to go one kilometer (or
one mile). The tachymeter scale indicated by the stopwatch second hand gives the
average speed per hour.
*
Tachymeter scale
figure at 40 seconds
position
x 1 (km or mile)
90
To measure the hourly average speed of a vehicle
(1)
•
= 90 km/h (o mph)
Ex.: 2)
If the measuring distance is extended to 2 kilometers (or miles) or shortened to 0.5
kilometers (miles), multiply the figure on the tachymeter scale by 2 or 0.5 respectively.
We recommend that you utilize the tachymeter in a rally, speedway or circuit race.
Tachymeter
scale figure
at 40 seconds position
x 2
(Kilometers
or miles)
90
= 180 km/h (o mph)
Tachymeter
scale figure
at 40 seconds position
x 0,5
(Kilometers
or miles)
90
= 45 km/h (o mph)
