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Estimating THD with Power Factor Histograms

Category: PMI Products, Guardian, Harmonics/Interharmonics

In the previous whitepaper Estimating THD with PF and DPF, a technique for estimating THD was shown given power factor and displacement power factor stripchart data. In many case, there’s no need to record both PF and DPF stripcharts. Without both recorded, it’s impossible to estimate THD with that technique. However, cycle histogram data for PF and DPF are always enabled, and thus available in any recording session from a PMI PQ recorder that can measure power. A method is presented here to use this histogram data to estimate average harmonic distortion for an entire recording session.


This white paper includes:

  • Theoretical background
  • Using histogram data
  • Examples

Download White Paper Here