Subject: Damping Resistor

Is anyone able to comment on this expression
o get a value for the damping resistor ?
Hi Geoff,
    Most geophones use a copper coil former, which also forms part of=20
the mass. Since this is moving in the magnetic field, damping currents=20
are induced in it, giving maybe 0.4 critical damping. I think that your=20
formula relates to a system with no inherent damping. The manufacturers=20
supply response curves for a range of damping resistors. =20
    Regards,
    Chris


=
Subject: Damping Resistor



Is anyone able =
to comment on this expression
to get a value for the da=
mping resistor ?
.
Hi Geoff,
    Most geophones use a copper coil former, which also forms part=
 of 
the =
mass. Since this is moving in the magnetic f=
ield, damping currents 
=
are induced in it, giving may=
be 0.4 critical damping. I think that your 
formula r=
elates to a system with no inherent damping.=
 The manufacturers 
supply response curves for a range of damping resistors.  
<=
PRE style=3D"FONT-SIZE: 9pt">    Regards,
    Chris