Tachymeter - Seiko 7T04 Instructions Manual

TACHYMETER

(for models with tachymeter scale on the dial)
To measure the hourly average speed of a vehicle
U s e t h e s t o p w a t c h t o
1
determine how many seconds
it takes to go 1 km or 1 mile.
2 Ta c hyme ter s c ale indic a te d
by STOPWATCH second hand
gives the average speed per
hour.
l 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 STOPWATCH second hand indicates "90" on tachymeter scale:
"0" (tachymeter scale figure) x  (km or mile) = 10 km/h or mph
"0" (tachymeter scale figure) x 0. (km or mile) = 4 km/h or mph
14
Ex. 1
STOPWATCH
second hand:
40 seconds
Tachymeter scale: "0"
"90" (tachymeter scale figure) x 1 (km or mile)
= 90 km/h or mph
To measure the hourly rate of operation
Use the stopwatch to measure
1
the time required to complete 1
job.
2 Ta c hy me ter s c ale indic a te d
by STOPWATCH second hand
gives the average number of
jobs accomplished per hour.
Ex. 2: If 15 jobs are completed in 20 seconds:
"10" (tachymeter scale figure) x 1 jobs = 700 jobs/hour
Ex. 1
STOPWATCH
second hand:
20 seconds
Tachymeter scale: "180"
"180" (tachymeter scale figure) x 1 job
= 180 jobs/hour
1