How do I Calculate Power Factor, Real, Reactive, and Apparent Power with Xviewer?

Xviewer waveform viewer software can calculate various power analysis measurements such as power factor, real power, reactive power, and apparent power.

Two sample waveforms are available in the attached zip file, and should be used to complete the following exercise.

  1. Download the Xviewer Power Analysis file and extract all files
  2. Open "ZERO CURRENT LAG.WDF" using Xviewer
  3. Click on Analysis » Waveform Parameter Settings » Waveform Parameter...
  4. Verify the RMS and Int2TY boxes are checked (blue) and click OK
  5. Use the Left Mouse Button to adjust Cursor 1
    and the Right Mouse Button to adjust Cursor 2
  6. Click on Analysis » Math Settings...
  7. Click on the empty box underneath Expression
  8. Fill in Units: VA and Expression: C1*C2 and click OK
  9. Click OK again to return to the main screen
  10. In the Main Results, scroll to the right to view the Apparent Power under the Math1 column
  11. Real Power is P = Int2TY(V*I)/T where T is the Time Difference between Cursor 1 and Cursor 2
  12. Reactive Power is Q = SQRT(S2-P2)
  13. Power Factor is PF = P/S

You can confirm your results by comparing your values with the values in the file "Xviewer Power Analysis.xlsx."

Related Products & Solutions

Data Acquisition (DAQ)

Yokogawa data acquisition systems give you the most flexibility and power to measure, display, store, and even actuate any number of physical or electrical phenomena.

High Speed Data Acquisition

  • Yokogawa high-speed data acquisition systems
  • Industry-leading isolation, bit resolution, sampling rate, and memory depth
  • Independent channel hardware and easy to use software


  • Digital oscilloscopes
  • High-speed sampling
  • Range of bandwidths for electronic device design and development
  • Advantages of oscilloscope and multi-channel data recorder

Oscilloscopes Application Software

  • Yokogawa's oscilloscope application software
  • View, export, analyze, and manage data 


  • Flexible, high-performance Yokogawa ScopeCorder
  • Modular platform combines mixed signal oscilloscope and portable data acquisition recorder 
  • Captures high-speed transients and low-speed trends 


Precision Making