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How to read the stopwatch minute hand
The stopwatch minute hand completes a full rotation in 30 minutes. The correct
indication of the stopwatch minute hand is determined in connection with the
position of the stopwatch hour hand.
When the stopwatch hour hand is pointing at
a position before a short indication (0.5 hour
index), read the minutes the stopwatch minute
hand is indicating. In the case illustrated above,
the measured time should be read as "6 hours
20 minutes and 10 seconds."
When the stopwatch hour hand is pointing at a
position after a short index (0.5 hour index), 30
minutes should be added to the minutes that the
stopwatch minute hand is indicating. In the case
illustrated above, the measured time should be
read as "6 hours 50 minutes and 10 seconds."
<Between 0 and 29 minutes>
<Between 30 and 59 minutes>
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
the 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 the 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
1
2
0.5 hour index
"20 min."
Stopwatch hour hand
Stopwatch minute hand
Stopwatch hour hand
Stopwatch minute hand
0.5 hour index
"50 min."