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The chart shows the accuracy of different types of Oscillators and frequency standards vs the amount of power they require. The Oscillator [XO] has the lowest accuracy and also requires the least amount of power. The Rubidium and Cesium standards are the most accurate, but also consume the most power [Atomic Clock Standards]. The Temperature Controlled Oscillator [TCXO] and the Oven Controlled Oscillator [OCXO] devices are the two most common styles that would be found on a Printed Wiring Board [PWB]. Note that the OCXO device consumes much more power than the TCXO device, but is also has better accuracy.





Use the Oscillator Accuracy chart as a rule of thumb, or a general guide line.

Related Acronyms;
XO - Clock Oscillator
CXO - Crystal Oscillator
DTCXO - Digitally Temperature Controlled Crystal Oscillator
EMXO - Evacuated Miniature Crystal Oscillator
FCXO - Frequency Controlled Crystal Oscillator
HPXO - High Precision Crystal Oscillator
MCXO - Microprocessor Compensated Crystal Oscillator
OCXO - Oven Controlled Oscillator
OCVCXO - Oven Controlled Voltage Controlled Oscillator
PXO - Precision Oscillator
PXO - Programmable Crystal Oscillator
SPXO - Simple Packaged Crystal Oscillators
TCXO - Temperature Compensated Oscillator
TCVCXO - Temperature Compensated Voltage Controlled Oscillator
VCXO - Voltage Controlled Oscillator
VCSO - Voltage Controlled Sinewave Oscillator

The graph below shows the accuracy of different atomic clocks developed by the National Institute of Science and Technology [NIST] over time.