Tachymeter意思
Tachymeter is a term used in horology, which is the study of time and timepieces. It refers to a feature found on some chronograph watches, which is an instrument for measuring speed.
A tachymeter scale is typically located on the outer edge of the dial or bezel of a watch. It consists of a series of markings or graduations that are used in conjunction with the chronograph function to measure the speed of an object over a fixed distance or time period.
Here's how it works:
- Start the chronograph function by pressing the start button.
- Measure the time it takes for the object to travel a known distance.
- Stop the chronograph function by pressing the stop button when the object has reached the end of the measured distance.
- Read the elapsed time from the chronograph sub-dial.
- Use the tachymeter scale to determine the speed.
The tachymeter scale is usually calibrated in kilometers per hour (km/h) or miles per hour (mph), and it allows you to calculate the average speed over a distance of 1 kilometer or 1 mile, respectively.
For example, if you start the chronograph and it takes 10 seconds for a car to travel 1 kilometer, you would read the elapsed time of 10 seconds on the chronograph and then locate the mark for 10 seconds on the tachymeter scale. The marking for 10 seconds will indicate the car's speed in km/h.
Tachymeters are commonly used by drivers, racers, and enthusiasts to measure their speed or the speed of other moving objects. They are a useful tool for those who need to make quick and accurate speed calculations.