Hello Bob,

Thanks for your response.

This is not what I am looking for.

I would prefer people not to use fancy software for communications.

Plain text with the option to look at graphics is much preferable to myself.

Everyone wants things formatted which can happen
in a zillion different ways.

For a bunch of science peoples Id think simpler would be better.

There is NO security in simplicity.

I like that.

For science stuff.

Regards,
geoff


On 2/6/2012 6:32 PM, Bob McClure wrote:
> Go to  http://insurance.ca.gov/error/free-document-readers.cfm to download
> free reader software.
> 
> Bob
> 
> 
> 
> On Mon, Feb 6, 2012 at 1:18 PM, Geoffrey  wrote:
> 
>>
>> The trouble with these government pubs is that
>> I do not have a decent reader for their
>> file types.
>> I will never understand why they don't use rich text files
>> or simply html or plain 7 bit text.
>> Something more universal than a snobby DOC file
>> which takes too much space on your machine
>> or cost too much money for the software to read it.
>> I do not like to MS stuff because they are too
>> involved when it comes to installing the software.
>> They almost always use special software
>> to make their documents.
>> I guess Ill stop crying now.
>>
>> Regards,
>> geoff
>>
>>
>> On 2/6/2012 5:39 AM, Stephen Hammond wrote:
>>> Hi Geoff, I get the impression you are looking for a simple answer to a
>>> complex problem. Here is a simple answer: I use three HS10 geophones on
>> my
>>> system and based on word of mouth input I received from a USGS tech in
>> 1990
>>> he told me to start with two  500 ohm resisters in a t-pad arrangement
>> just
>>> to get started and work up until I got the output I desired. That said,
>>> Chris is right-- you will need the specs from the manufacture if you
>> want to
>>> setup your geophones with any kind of precision . Here are two links,
>> one to
>>> a USGS report describing setting the damping values for the S and T
>>> resisters in a t-pad style damping  (one resister across the coil output
>> and
>>> one resister in series between the coil output and one of the inputs to
>> the
>>> filter/amp).  Here is a link to a USGS paper and calibration results for
>>> their sensors. http://geopubs.wr.usgs.gov/open-file/of99-434/
>>>
>>> Here is the link to the Stanford Geo lab calibration procedure for the
>> L4C
>>> geophone.
>> http://www-ssrl.slac.stanford.edu/lcls/technotes/lcls-tn-03-6.pdf
>>>
>>>
>>>
>>> I hope this helps, Regards Steve Hammond PSN San Jose, Aptos, CA.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> From: psnlist-request@.............. [mailto:
>> psnlist-request@...............
>>> On Behalf Of chrisatupw@.......
>>> Sent: Sunday, February 05, 2012 4:42 PM
>>> To: psnlist@..............
>>> Subject: Re: Damping Resistor
>>>
>>>
>>>
>>> Subject: Damping Resistor
>>>
>>> Is anyone able to comment on this expression
>>> to get a value for the damping resistor ?
>>> .
>>> Hi Geoff,
>>>     Most geophones use a copper coil former, which also forms part of
>>> the mass. Since this is moving in the magnetic field, damping currents
>>> are induced in it, giving maybe 0.4 critical damping. I think that your
>>> formula relates to a system with no inherent damping. The manufacturers
>>> supply response curves for a range of damping resistors.
>>>     Regards,
>>>     Chris
>>>
>>
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