Frequency Measurement

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Joined: 09/08/2007
Location: Australia
Posts: 3261
Posted: 07:07am 23 Jun 2018      

Not if you increase the measurement interval by the same proportion.

If you have 1Mhz and you count over one second, you will have a one million count, with 1Hz resolution, but with a one count uncertainty.

If you have 10Mhz, first divide that by ten down to 1Mhz, and then count over ten seconds and you will have a ten million count and get the same 1Hz resolution with the same one count uncertainty.

The measurement just takes ten times longer to do, but accuracy and resolution remain the same.

If you are stuck with a slow hardware/software and you wish to measure up to very high frequencies with good resolution, you can still do it, but the trade off is time required to make the measurement.Edited by Warpspeed 2018-06-24
Cheers, Tony.