# What does the frequency of an automatic watch mean?   In watchmaking, the frequency of movement is a true marketing asset. Many brands have launched a race to increase the swing speed and performance of their watches. But what about this famous frequency?

## The frequency explained The balancing spring is at the heart of the clock. When you swing, it will allow you to deliver time accurately. The frequency of the movement corresponds to the number of pendular movements round trip per hour. An oscillation (a “ticking”) corresponds to two half waves (forward and backward).

This frequency can be expressed in hertz (Hz) or alternatively per hour (A / h).

The most common frequency for modern mechanical watch movements is 4 Hz, or 28,800 vibrations per hour. A clock that rotates at 4 Hz performs 4 oscillations per second or 8 half oscillations per second. Knowing that there are 60 seconds in a minute, this produces 480 half oscillations (or vibrations) per minute. If you multiply 480 vibrations per minute by 60 minutes of one hour, you will get the figure of 28,800 vibrations per hour. Therefore, a chronograph of a watch at 28,800 vibrations per second can time an event at 1/8 of a second.

For example :

• Frequency of 2.5 Hertz = 18,000 vibrations per hour (A / h)
• Frequency of 3 Hertz = 21,600 vibrations per hour (A / h)
• Frequency of 4 Hertz = 28,800 vibrations per hour (A / h)
• Frequency of 5 Hertz = 36,000 vibrations per hour (A / h)

The numbers obviously do not stop there and go much higher. The test with quartz watches, which mostly have a frequency of 32 MHz.  