Seiko CAL. 7T94 User Manual download pdf (Page 12)

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TACHYMETER

(for models with tachymeter scale on the dial)

● Tachymeter scale can be used only when the time required is less than 60 seconds.

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.

Tachymeter scale indicated by

STOPWATCH second hand gives

the average speed per hour.

Ex. 1

STOPWATCH

second hand:

40 seconds

Tachymeter scale: “90”

“90” (tachymeter scale figure) x 1 (km or mile)

= 90 km/h or mph

Ex. 2: If the measuring distance is extended to 2 km or miles or shortened to 0.5 km or miles

and STOPWATCH second hand indicates “90” on tachymeter scale:

“90” (tachymeter scale figure) x 2 (km or mile) = 180 km/h or mph

“90” (tachymeter scale figure) x 0.5 (km or mile) = 45 km/h or mph

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Seiko CAL. 7T94 User Manual Page 12