Resolution of F vs t measurement

Excom

Hi all

I have measured the resonance frequency of a resonator as a function of time by mean of a Laser-Doppler vibrometer and a frequency counter. In this measurement there are some fluctuations in the measured frequency as time goes by.
My question is: How do I determine the resolution of this frequency measurement? Or in another way: How precise can I resolve the frequency? Do I take the standard deviation for a period and then define this as my frequency resolution?

I hope someone can help me.

Best regards
Excom

sophiecentaur

That would be the RMS error. A pretty universal way of stating errors - I say go for it.

Excom

Thanks:-)