Hi Tiago

When its recording you can also drop a small 1 or 2g lead or steel
ball bearing on top of the case. Its one of the simplest ways of
aproximating  to a dirac spike :)

Then analyse the frequency content and see its lowest frequency. Make
sure you sample well and check the acquisition filters so you don't
have low cuts ...

Good luck

Rui

2012/4/16  :
> Tiago Agrelos tiagoagre@.........
> Sent: Mon, 16 Apr 2012 1:23
> Subject: Help on finding natural frequency of a geophone.
>
>
> I=B4ve small geophone almost a year, but i never knew its natural frequen=
cy,
> how can i "find" its approximate natural frequency?
> The geophone doesnt have anything written on it, its smaller than 4.5Hz L=
15B
> geophone sold by Larry, generate a lot more output than the 4.5Hz one and=
 i
> read 380ohm from it.
> Tiago.
> Hi Tiago,
>
> =A0=A0=A0 =A0Check out the geophone sizes and resistances on
> http://www.geospacelp.com/
>
> =A0=A0=A0=A0 Connect the geophone to=A0your seismic recorder and set it t=
o record. Tap
> the geophone
> with a pencil and analyse the recorded signal to=A0get the approximate
> period.
>
> =A0=A0=A0 Regards,
>
> =A0=A0=A0 Chris Chapman
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