I would recommend that those folks either zip
or rar everything into a single package
for download.
Then you'd have everything needed.
geoff

-----Original Message----- 
From: Timothy Carpenter 
Sent: Saturday, May 28, 2011 4:46 PM 
To: psnlist@.............. 
Subject: RE: Geophone Generator Constant, Winquake 

Maruo,
The SEISMOWIN package appears to be a powerful tool -- Thanks for pointing
it out to us. However, I had a couple of problems with download and
installation. The first problem, I think, has more to do with Windows 7 than
SEISMOWIN. The module downloaded ok seemed to launch properly. However, when
I tried to download the RESP module, I consistently got the message that the
SEISMOUPDATER executable couldn't be found. It turns out that Windows 7 was
processing in the background to address some compatibility problems with the
main module. After a minute or two I relaunched the program and was then
able to download RESP.
The second problem came after I downloaded the RESP module. It ran ok, but
when I tried to download the manual I got the message "Requested file
doesn't exist on server." I tried again, this time requesting the Italian
version -- no luck. I then tried to download the manual for CONV but it too
gave me the "doesn't exist" message.
Regards,
-Tim-

Timothy Carpenter, P.E., President
GeoDynamics Consultants, Inc.
5043 Whitlow Ct.
Commerce Twp., Mi
248-363-4529
248-766-1629
geodynamics@...........
geodynamics@.......

-----Original Message-----
From: psnlist-request@.............. [mailto:psnlist-request@...............
On Behalf Of Mauro Mariotti
Sent: Saturday, May 28, 2011 3:39 AM
To: psnlist@..............
Subject: Re: Geophone Generator Constant, Winquake

Hello Geoff,

i didn't checked all the numbers but you are right.
In seismology all the recording are made in counts; in some cases in volts.
After recording all is deconvolved to the final measurement unit applying
the inverse filter of the system transfer function also called "system
response".
In this way the amplitude at all frequencies is corrected appropriately.
If you go to the web site of my company www.sara.pg.it and download the
software SEISMOWIN using the SEISMOWIN.MSI you can install a number of
tools.
After installed SEISMOWIN.MSI launch it and a window with many icons will
show up.
No modules are installed at this moment.
You need to install what you want.
Clicking with the right-button of the mouse you open some options, among
them you select "install from internet".
Clicking with the left-button of the mouse you launch the module.
In your case i recomend to install the RESP module.

This module allow you to compute the transfer function of practically any
system. You can export the system response in poles and zeroes or in a
frequency/amplitude/phase table.
The table or the poles-and-zeros can be normalized at any frequency (1Hz,
10Hz or whatever).

I would launch to Larry the idea to implement this correction in WinQuake
instead of use only the transduction factor wich is valid only in the
portion of band where the system response is flat.
At moment we can use the transfer function in the module SURVEY, its use
need a little training.
We have some manual online downloadable in the same manner of the module
installation.
You may try.

Use of SEISMOWIN sofwtare is free for educational or private use.

best regards
Mauro




Il 27/05/2011 23:34, Geoffrey ha scritto:
> Hello PSN,
>
> Question: Does any/all of this seem right or wrong to you ?
>
> The layout of the circuits are as follows:
> 1. Geophone Preamplifier and Damping circuits X500 no filtering 2. 
> Equalization Filter and amplifier X21 filter at (1/18.8) Hz 3. 
> Antialize filter X1 N=8 at 10Hz 4. DC blocker X1 N=1 at (1/100)Hz 5. 
> Voltage Follower X1 6. Distribution Manifold circuit A. A/D converter 
> X1 B. Analog Meter circuit X20
> Hs10-1 Vertcal Geophone
> 435 ohms at operational temperature
> G = 2.99 V/(in/sec)
> hm = 0.35
> Fc = 1Hz
> Mass = 33 ounces avd.
>
> Given:
> Generator Constant:
> 2.99V/(in/sec)
> Geophone resistance:
> 435 ohms
> Damping resistor = 205 Ohms
> Preamplifier with gain of 500 and no filtering Preamplifier Low Pass 
> Filter N=1 of the following Rf = 1 Meg Cf = 3uf gain is X21 When I 
> Plug in my numbers, The OVERALL amplifier gain was computed only for 1 
> Hz.
>
> 1. minus Voltage loss related to damping resistor
>
> K1 = 20 log(Rd/(Rg + Rd))
> = -9.888 dbv
>
> 2. plus DC voltage gain of preamplifier (no filtering)
>
> K2 = 20log((R1 + R2) / R1)
> = 53.979
>
> 3. plus DC voltage gain of filter stage
>
> K3 = 20log((R1 + R2) / R1)
> =26.510
>
> 4. minus voltage gain due to filtering at at 1Hz
> K4 = 20log(Xc/Z)
> =-25.518
> Xc = 1/2PiFC
> Z = SQR(r^2 + Xc^2)
>
> 5. Overall:
> K = K1 + K2 + K3 + K4
> = -9.888 + 53.979 + 26.510 + -25.518
> = 45.083dbv or X179.535 AT Only ONE HERTZ
>
> I do not worry about dampend generator constant ( Ge ) since it is 
> covered under Item number one as a loss.
>
> This should mean that only at one hertz my Ge going into the 16 bit 
> A/D is
> 2.99 X 179.535 or 536.80965 (Volts/(inch/second)) This should 
> translate to Volts/(cm/s) like this Ge = 536.80965 / 2.54 = 
> 211.3423819 (Volts/(cm/sec)) Going into the A/D converter which is 
> Volts Per Count = (5Volts /
> 32767counts)
> This means One count is the following:
> 211.3423819 V/(cm/s) X (32767 Counts/ 5 Volts) = 13850.11166
> Counts/(cm/sec) or
> 1/13850.11166 (cm/sec)/COUNT or 7.220158E-6 (cm/sec)/count or
> *******************
> One Count equals 72.20158 nano meters per count At 1Hz and only 1Hz
>
> *******************
>
> This gain will have to be recalculated for any other frequency.
> I also have N=8 LPF at 10Hz and a N=1 100sec HPF Dc blocker.
> Does any of this sound right to you ?
>
> Is this the right way to calculate overall AMPLIFIER gain etc. for WinSDR
?
>
> What is the best way to handle the magnitude correction ?
> Like if no correction at all.
> It is my guess, by adjusting the generator constant because it might 
> not meet factory specifications.
> All the other numbers seem to be known.
>
> Please do not challenge my damping resistor at this moment.
> I have chosen a value of 205 Ohms for my own selfish reasons.
>
> Regards,
> geoff
>
>
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSNLIST)
>
> To leave this list email PSNLIST-REQUEST@.............. with the body 
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>
>

--
Mauro Mariotti
http://www.infoeq.it
http://www.sara.pg.it

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