English
English
9
8
1 Use the stopwatch to determine
how many seconds it takes to go 1
km or 1 mile.
2 Locate the second marker on the
main dial that corresponds to the
measured seconds, and the ta-
chymeter scale it indicates gives
the average speed per hour.
TACHYMETER
[for models with tachymeter scale on the dial]
To measure the hourly average speed of a vehicle
“90” (tachymeter scale figure) x
1 (km or mile) = 90 km/h or mph
Tachymeter
scale: “90”
Tachymeter scale can be used only when the time required is less than 60 seconds.
Ex. 2: If the measuring distance is extended to 2 km or miles or shortened
to 0.5 km or miles and CHRONOGRAPH second hand indicates “90”
CHRONOGRAPH
second hand:
40 seconds
s
Ex. 1
Ex. 1
To measure the hourly rate of operation
1
Use the stopwatch to measure the
time required to complete 1 job.
2
Locate the second marker on the
main dial that corresponds to the
measured seconds, and the ta-
chymeter scale it indicates gives
the average number of jobs accom-
plished per hour.
s
“180” (tachymeter scale figure) x
1 job = 180 jobs/hour
CHRONOGRAPH
second hand:
20 seconds
Tachymeter
scale : “180”
Ex. 2: If 15 jobs are completed in 20 seconds:
“180” (tachymeter scale figure) x 15 jobs = 2700 jobs/hour
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
