## PSN-L Email List Message

**
Subject: Re: Damping Resistor**

From: Bob McClure bobmcclure90@.........

Date: Sun, 5 Feb 2012 14:13:25 -0500

I studied
http://www.geophys.uni-stuttgart.de/oldwww/seismometry/man_html/node20.html
Note that most geophones already have significant internal damping. Consult
the data sheet and use only enough shunt damping to make up the difference
between 0.707 and the internal damping coefficient.
Bob
On Sun, Feb 5, 2012 at 1:56 PM, Geoff wrote:
> Is anyone able to comment on this expression
> to get a value for the damping resistor ?
>
> Rd = (Rg/(sqrt(2) - 1))
>
> So like if Rg = 438 Then
> Rd = 1058
>
> and this means
>
> Ge = G * Rd/(Rd + Rg)
>
> And, So that
>
> G = 2.99 V/(in/sec)
>
> Ge - 2.114 V/(in/sec)
>
> For Winquake this becomes
>
> 2.114/2.54 = 0.83228 V/(cm/sec)
>
> Would this be the value for the sensor in
> Winquake and Winsdr ?
>
> I'm just trying to get meaningful numbers for these programs.
>
> Regards,
> geoff
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=C2=A0 I studied=C2=A0=
http://www.geophys.uni-stuttgart.de/oldwww/seismometry/man_htm=
l/node20.html=C2=A0

Note that mos=
t geophones already have significant internal damping. Consult the data she=
et and use only enough shunt damping to make up the difference between 0.70=
7 and the internal damping coefficient.

Bob

On Sun, Feb 5, 2012 at 1:56 PM, Geoff

<gmvoeth@...........> wrote:<=
br>

Is anyone able to comment on this expression=

to get a value for the damping resistor ?

Rd =3D (Rg/(sqrt(2) - 1))

So like if Rg =3D 438 Then

Rd =3D 1058

and this means

Ge =3D G * Rd/(Rd + Rg)

And, So that

G =3D 2.99 V/(in/sec)

Ge - 2.114 V/(in/sec)

For Winquake this becomes

2.114/2.54 =3D 0.83228 V/(cm/sec)

Would this be the value for the sensor in

Winquake and Winsdr ?

I'm just trying to get meaningful numbers for these programs.

Regards,

geoff

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