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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 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.
Graph of Oscillator Accuracy, Oscillator Stability vs Frequency Standards
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
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