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Test Definitions

  

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Spread Spectrum Clocking
  (SSC) - Spread-spectrum clocking is a fundamental way that electronic devices can have oscillators but not produce more electromagnetic interference than allotted by the Federal Communications Commission (FCC). In theory, spread-spectrum clocking means that the tone is varied so that the clock signal is almost the desired frequency. For example, for a 1 GHz processor, the frequency might be 999.5 Mhz at one moment in time and 1.0005 GHz at another. Doing this constantly causes the power of the tone to be "spread" out more over a broader band of tight frequencies (centered at the desired tone).
Source: National Instruments
 

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