Seiko H021 Manual - Page 22
HOW TO USE THE TACHYMETER, for models with tachymeter scale on the dial
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English HOW TO USE THE TACHYMETER (for models with tachymeter scale on the dial) To measure the hourly average speed of a vehicle 1 Use the stopwatch to determine how many seconds it takes to go 1 km or 1 mile. 2 Tachymeter scale indicated by Second hand gives the average speed per hour. Ex. 1 Tachymeter scale: "80" ➚ Second hand: 45 seconds "80" (tachymeter scale figure) x 1 (km or mile) = 80 km/h or mph * Tachymeter scale can be used only when the time required is less than 60 seconds. If necessary, 22 shorten the measuring distance.
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English
22
To measure the hourly average speed of a vehicle
Use the stopwatch to determine
how many seconds it takes to go
1 km or 1 mile.
1
Tachymeter scale indicated by
Second hand gives the average
speed per hour.
2
Ex. 1
“80” (tachymeter scale figure) x 1 (km or mile)
= 80 km/h or mph
HOW TO USE THE TACHYMETER
(for models with tachymeter scale on the dial)
Tachymeter
scale: “80”
Second hand:
45 seconds
*
Tachymeter scale can be used only when the time required is less than 60 seconds.
If necessary,
shorten the measuring distance.