How to check the sensitivity of the watch?
The sensitivity of a watch refers to the flexibility of its balance wheel to swing automatically. The check method is:
Gently shake the watch that has not been wound and has stopped. Use the power of shaking to observe the movement of the second hand. If the second hand stops moving within a short time. This means that this watch can be fully wound after it is fully wound (that is, the clockwork has no torque), and the sensitivity is high. If the second hand continues to move for a long time. It means that the watch cannot be fully wound after it is fully wound (that is, the clockwork still stores torque). The sensitivity is not high or the meter is malfunctioning.
Slowly turn the head of the watch that has not been wound and stopped. Observe the start of the second hand. The less the winding handle turns, the earlier the second hand starts, the higher the sensitivity of the watch is. Otherwise, the sensitivity is low or the meter has other malfunctions. But it should be noted that the fast swing watch due to the greater rigidity of the hairspring. Compared with the traditional frequency (18000 times/hour), the watch machine needs a little more clockwork to start the swing. A watch with high sensitivity will continue to move for a longer time after a full clockwork.
A certain distance should be maintained between the hands of the watch and the glass, the dial, and between the three hands. Otherwise, they will rub against each other and affect the normal operation of the meter. It can be observed by dialing the needle during inspection.