Helmholtz Resonator using voltmeter

[SalfordPhysics]

Hi,

I am trying to understand how precisely a voltmeter is used to measure the resonant frequency of a sound wave in a helmholtz resonator. Is it simply that the maximum voltage corresponds to the resonant frequency?
A detailed description or external link would be great.

Many thanks.

 

[nasu]

What voltage? The resonator does not produce a voltage. Do you have a sensor, a transducer somewhere?

 

[SalfordPhysics]

A microphone connected to a voltmeter.