When the First World War broke out in 1914, the military of various countries realized the importance of “hands-free” watches. In 1926, the first self-winding watch was invented. Since 1960, the traditional round form has been generally liked by the public. Further improvements to the watch in Switzerland. In 1952, an electronic watch was produced in the United States, France and Switzerland. In 1967, Neuchâtel’s Electronic Watch Center developed the first quartz wristwatch. And in 1970, mass production began under the names of different Swiss brands. Since then, new technologies have begun to develop rapidly, and wrist watches of different brands have also begun to develop rapidly.
The amplitude of the watch is usually measured with an amplitude meter. Switzerland produced AM201 and GD-50 models in the early years. It is measured by the so-called “base angle method”. Therefore, it is necessary to select the corresponding balance wheel lift angle of the watch under test before measurement.
In the use of instruments to detect watches, a complete detection unit requires a calibration meter and amplitude meter. In the previous maintenance of watches and clocks, only the calibration instrument was used. The amplitude meter can only be seen in a watch factory. It shows that everyone generally only pays attention to the speed accuracy of the watch. The swing and accuracy are equally important and interrelated. The technical indicators of the swing range are not good, and a watch with a large gap and a large gap will definitely not go well. Especially when calibrating the balance wheel balance and adjusting the position error. The swing range must be referenced. The concept of swing range requires maintenance personnel to have a higher level of clock theory.