Definition
Hertz (Hz) is the unit of frequency in the International System of Units (SI) and is used in watchmaking to measure the oscillation frequency of a watch’s balance. One Hertz is equivalent to one oscillation (or cycle) per second. In mechanical watches, frequency is typically expressed in Hz or vibrations per hour (vph), with common frequencies ranging from 2.5 Hz (18,000 vph) to 5 Hz (36,000 vph).
Origin
The term was named after German physicist Heinrich Hertz, who made significant contributions to the study of electromagnetic waves in the late 19th century. The adoption of Hertz as a unit of frequency took place in the 20th century.
Usage
In watchmaking, the frequency measured in Hertz is crucial for determining a watch’s accuracy. A higher frequency generally signifies greater accuracy, but it can also lead to more wear and tear on the parts and less power reserve.
Examples
Watches with a frequency of 4 Hz (28,800 vph) are common, striking a good balance between precision and durability.
The Zenith El Primero, known for its high frequency, operates at 5 Hz (36,000 vph), delivering exceptional accuracy.
Synonyms
While “Hertz” is the technical term, phrases like “oscillation frequency” or “cycles per second” are used similarly.
Related Terms
- “Balance”: the part of the watch that oscillates, whose frequency is measured in Hertz.
- “Power Reserve”: the running duration of the watch which can be influenced by the frequency.
Tips
When choosing a mechanical watch, consider the frequency (Hz) to evaluate its precision and maintenance need.
High-frequency watches may require more frequent maintenance due to quicker wear and tear on parts.
Fun Facts
The evolution of watch frequencies over time reflects advances in precision and complexity of watchmaking engineering.
Choosing the frequency in a watch is a balance between accuracy, power reserve, and the durability of the mechanism.