Also once you get the geophone hooked up to the computer, look at the data
trace that you get when you giggle the geophone a little.  If the trace
takes several cycles to dampen out it is underdamped and you may need to
add a little more parallel resistance.  If the trace settles out in about
1 and 1/2 to 2 cycles it is just about critically damped which is where it
sould be.

Greg Bajuk

On Thu, 23 Dec 1999, macsmith wrote:

> Hi,
> 
> thanks for the replies.  I've just done a search of the mail archive (which I should have done
> fiirst!) and found:
> 
> > The 4.5 Hz is Mark Products L10B single vertical geophone in aluminum case
> > with 2 3/4 inch spike,3 foot lead and Amphib IV connector.  They have a
> > shunt resistor soldered across them for approximately 60% damping.
> 
> > The coil resistance for the 4.5 hz sensor is around 220 ohms.
> 
> So it looks like I just connect it straight to my amp.
> 
> cheers
> 
> 
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