Frequency Stability & Precision Timing Toolset™

Perform allan deviation, power oscillation, phase noise measurement, and more.

EZL’s Time Domain Frequency Stability and Precision Timing Toolset™ includes the most widely used statistical analysis tools for frequency stability and precise time and time interval (PTTI) data.

The time domain stability of a frequency source is measured as a statistic of its phase or frequency fluctuations, as a function of time. Because the noise types commonly associated with time and frequency sources are divergent, common metrics – such as the standard variance, which assumes a constant mean – cannot be applied. Therefore, other variances have been developed for the time and frequency metrology, which provide far better characterization.

The Allan Variance (typically presented as its square-root – the Allan Deviation) is the most common time domain measure of frequency stability.

The National Institute of Standards and Technology (NIST) provides a great report of time domain frequency stability analysis in their Handbook of Frequency Stability Analysis.

Allan deviation Frequency stability

Key Features:

  • Allan Deviation1 (ADEV) – Allan Variance (AVAR)
    • Normal
    • Modified (MDEV)
    • Overlapping
    • Hadamard (HDEV)
    • Time (TDEV)
  • Power Oscillation
  • Phase noise measurement
  • Built-in Noise generator
    • Generate statistically accurate noise data sets of unlimited size
    • Model your noise sets with one or more weighted noise types, including
      • Random Walk Frequency Modulated (FM)
      • Flicker FM
      • White FM
      • Flicker Phase Modulated (PM)
      • White PM

1 Visit the wikipedia page on Allan Variances for some great details on this very useful statistic!

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