Frequency Stability & Precision Timing Toolset™

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.

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!