A chronograph is a watch that has a stopwatch function in addition to a time display function. This watch features a stopwatch function which can measure time up to 12 hours in 1/8-second increments.
Before using the stopwatch function
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Make sure that the mainspring is sufficiently wound.
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Make sure that the center chronograph seconds hand is pointing at the 0 position.
When using the stopwatch, ensure that the watch is working.
If it is not pointing at the 0 position, press the RESET button.
Do not pull out the crown while the stopwatch function is operating, as doing so will stop the measurement.
Names of the chronograph parts and their function
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Center chronograph seconds hand
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12-hour dial
Chronograph hour hand -
30-minute dial
Chronograph minute hand -
START/STOP button
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RESET button
The orientation and design of the display may vary depending on the model.
How to use the chronograph (stopwatch) function
Press the START/STOP button to begin measuring time.
Pressing START/STOP button repeatedly enables the chronograph to continue to count.
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Make sure that the mainspring is sufficiently wound and the watch is working.
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Start measuring time.
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Stop measuring time.
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Reset the chronograph hands.
Upon pressing of the START/STOP button, the chronograph hands start moving and the stopwatch starts measuring time.
At the moment you want to finish the measurement, press the START/STOP button again to stop the chronograph hands.
【Ex.】
6 hours 20 minutes 10 seconds and 0
The chronograph minute hand on the 30-minute dial completes two full rotations in an hour.
To read the 30-minute dial, see the display of the 12-hour dial as a rough indication.
After stopping the chronograph hands, press the RESET button to return all the chronograph hands to the 0 position.
How to use the tachymeter
The tachymeter can be used to measure average speed or productivity rate per unit time.
How to measure average speed of your vehicle
【Ex.】
Measure the time taken by your vehicle to go one kilometer
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When the car passes the start line, press the START/STOP button to start the stopwatch.
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When the car crosses the 1-kilometer mark, press the START/STOP button to stop the stopwatch. Read the number on the tachymeter scale to which the center stopwatch seconds hand is pointing.
The measured result shows that the average speed of the vehicle is 80 km/h.
1 km
How to compute productivity rate per hour
【Ex.】
Measure the time required to produce one unit
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At the start of production, press the START/STOP button to start the stopwatch.
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When the production is completed, press the START/STOP button to stop the stopwatch. Read the number on the tachymeter scale to which the center stopwatch seconds hand is pointing.
The measured result shows that the average productivity rate is 300 units/h.
1 unit
How to use the telemeter
The TELEMETER scale can be used to measure the distance of something (ex: lightning) from the wearer of the watch by the amount of time it takes for a sound to travel.
【Ex.】
These are the steps to measure the time from when lightning appeared to when the sound reached the wearer.
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Press the START/STOP button when a flash of lightning appears to start the stopwatch.
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When the thunder is heard, press the START/STOP button to stop the stopwatch, then read the number on the telemeter at the position indicated by the center stopwatch seconds hand.
The measurement result shows that it is 8km from the point where the wearer is to the point where the lightning struck.
The elapsed time after a flash is seen until thunder is heard