I wanted to know if there's an instrument that accurately measures the frequency of radio waves as I'm working on something and I didn't get anything good on web.

  • 1
    $\begingroup$ What frequency range of radio waves do you want to measure? 100 kHz is a lot easier to measure than 100 GHz. $\endgroup$
    – The Photon
    May 3, 2021 at 5:01
  • $\begingroup$ if lower frequency can be measured easily then thats good i guess and btw is should be small if any $\endgroup$ May 3, 2021 at 5:20
  • $\begingroup$ What do you mean by "not measuring wavelength"? $\endgroup$
    – DKNguyen
    May 3, 2021 at 6:14
  • $\begingroup$ Sry I meant direct frequency measurement, I got confused while writing the question $\endgroup$ May 3, 2021 at 6:33

1 Answer 1


You can easily buy a frequency counter that measures frequencies up to a few gigahertz with accuracy better than 1 ppb (one "part per billion" or a relative error of $10^{-9}$).

If you need to measure higher frequencies you can consider pre-scaling. That is, use a frequency divider to lower the frequency by an integer divisor, and then measure the lower frequency with a frequency counter.

If you need greater accuracy, you can consider using a higher-quality reference clock for your frequency counter. The ultimate reference would be an atomic clock at one of the national standards labs.


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