How does a Casio watch measure speed, how does a Casio analog watch use a speed meter

Ordinary tachymeter, starting at 60 yards, the specified distance is 1 km. After the first reference.

Press the chronograph pusher, press the pause button when passing the second reference, and the reading of the hand to the outer ring is the speed.

A watch tachymeter is a chronograph with decreasing numbers such as 500, 400, 350, etc., engraved on the outer ring of the watch, and these represent physical quantities.

is the speed in kilometers and hours; This bezel is called a tachymeter.

How to use the watch speed test:

The usage method is to take the vehicle driving on the highway as an example, because the highway is generally erected with distance indication signs; The stopwatch is activated when the start point is passed, and the stopwatch hand starts at 12 o'clock and stops when it moves 1 km, and the number pointed by the hand is the average speed of the previous km.

For example, if there is 60 at 12 o'clock, because you have walked 1 kilometer in one minute, then the speed is 60 kilometers per hour.

How is the position of the number on the bezel calculated? It's actually quite simple. To know where the number 500 should be engraved?

Then you need to do a simple division; That is, calculate how much time it takes to travel 1 km at a speed of 500 km/h, in seconds.

1 hour = 3600 seconds, then 500 kilometers need 3600 seconds to complete, according to the principle of proportionality, the time required for 1 kilometer is 3600 500 = seconds, so 500 must be engraved on the second of the dial. In the same way, 400 should be engraved at 3600 400 = 9 seconds, while 100 should be engraved at 36 seconds.

At speeds below 60 km/h, the tachymeter cannot be used directly unless the scale value for low speed is added.

Analogue watches generally have a tachymeter function, which is located on the outermost part of the dial or above the outer ring of the case. The main principle is that a certain unit distance is known.

For example, 1 km or 1 mile, when a moving object starts to move within this distance, the start function of the chronograph is activated, and when the stop button is pressed after the unit distance is completed, the speed of the object is the scale indicated by the pointer.

If the scale system is a single-lap design, the speed of the object is less than 60 kilometers per hour, and the computer fails; The scale is a spiral design, and the outer ring of the watch with the stopwatch function will be engraved with 500, 400, 350 and other decreasing numbers, which represent the physical quantity of speed, and the unit is kilometers and hours. Mu friends.

This bezel is called a tachymeter. Such as a car at a fixed average speed of one kilometer or one mile. Take the speed measurement method as an example, when the car is moving forward with the mileage marker on the side of the road as the reference point.

Start to activate the timer, when the car reaches the next mileage marker, the timer presses to stop, and the position where the timer hand stays on the speedometer scale is the speed of the car, such as 1,000 meters used for 45 seconds, which can be converted to a speed of 80 kilometers per hour.

Press the B button to reset the stopwatch and check if the position of the stopwatch second hand and the second hand point to 12 o'clock. Duan Ran.

If the position is incorrect, pull out the watch knob to the second square, press the A button to turn the second hand of the stopwatch to adjust it to the 12 o'clock position. If the hands are still not aligned correctly, (for example, the hands of the bottom bezel do not point correctly to the 12 o'clock position), press the B button to turn the stopwatch hand to adjust. Make it adjust to homing.