![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/HP_Counter_0XCO.jpg/640px-HP_Counter_0XCO.jpg&w=640&q=50)
Crystal oven
Temperature-controlled chamber for a quartz crystal / From Wikipedia, the free encyclopedia
A crystal oven is a temperature-controlled chamber used to maintain the quartz crystal in electronic crystal oscillators at a constant temperature, in order to prevent changes in the frequency due to variations in ambient temperature. An oscillator of this type is known as an oven-controlled crystal oscillator (OCXO, where "XO" is an old abbreviation for "crystal oscillator"). This type of oscillator achieves the highest frequency stability possible with a crystal. They are typically used to control the frequency of radio transmitters, cellular base stations, military communications equipment, and for precision frequency measurement.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/HP_Counter_0XCO.jpg/320px-HP_Counter_0XCO.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/54/Mini_Crystal_Oven.jpg/640px-Mini_Crystal_Oven.jpg)