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Q&A Standardized way of measuring AC line frequency

In a general sinewave as below, is there a "right" way/"standardized" way to measure line frequency - and how do energy meters calculate that? measuring pulse width of half-period, ie. time elap...

3 answers  ·  posted 7mo ago by 2kind‭  ·  last activity 6mo ago by Pete W‭

Question frequency AC
#2: Post edited by user avatar 2kind‭ · 2024-05-03T19:14:42Z (7 months ago)
  • In a general sinewave as below, is there a "right" way/"standardized" way to measure line frequency - and how do energy meters calculate that?
  • - measuring pulse width of half-period, ie. time elapsed and then doing f=2/T
  • - measuring pulse width of full-period, then f=1/T
  • Is there a need to average and filter?
  • ![sinewave period](https://electrical.codidact.com/uploads/dhj3n3xy3wkvlfmkw5nl36aj5sna)
  • In a general sinewave as below, is there a "right" way/"standardized" way to measure line frequency - and how do energy meters calculate that?
  • - measuring pulse width of half-period, ie. time elapsed and then doing f=2/T
  • - measuring pulse width of full-period, then f=1/T
  • Is there a need to average and filter assuming the reading is being taken with a microcontroller?
  • ![sinewave period](https://electrical.codidact.com/uploads/dhj3n3xy3wkvlfmkw5nl36aj5sna)
#1: Initial revision by user avatar 2kind‭ · 2024-05-03T12:18:24Z (7 months ago)
Standardized way of measuring AC line frequency
In a general sinewave as below, is there a "right" way/"standardized" way to measure line frequency - and how do energy meters calculate that?

- measuring pulse width of half-period, ie. time elapsed and then doing f=2/T
- measuring pulse width of full-period, then f=1/T

Is there a need to average and filter?

![sinewave period](https://electrical.codidact.com/uploads/dhj3n3xy3wkvlfmkw5nl36aj5sna)