Thank you Rodger, but what does a count of 60 or a count of 100 mean =
specifically,........ a frequency or amplitude measurment or something =
else?   Thanks again, Ed.



.
----- Original Message -----=20
From: "rsparks" 
To: 
Sent: Thursday, April 30, 2009 7:07 PM
Subject: Re:Counts


Hi Geoffrey,

You raise an interesting question--What is the "grass"? =20

For some folks, it is the microseims apparently generated by ocean waves =
and maybe atmospherics.  For others, it is local man made noise.  For =
still others, it may be the electronics of the amplifier, or noise from =
hinges or other seismometer  parts.

If your hinges and electronics are reasonably quiet, you should be able =
to see much smaller vibrations "riding" on the traces from the =
microseims.  I like counts of 60 to 100 for the microseims so that I can =
see small local quakes that are of higher frequency than the micoseims =
but much smaller magnitude.  Counts like this also pick up local noise =
but a quake looks a lot different from a car going by.

BTW, I am using the Saum system that uses a  16 bit A/D and has a peak =
count of +/- 32768.

Roger

Geoffrey wrote:
Subject: Re: Counts
From:    "Geoffrey" 
Date:    Wed, 29 Apr 2009 19:36:36 -0700

Im not sure what you guys are talking about
BUT I thought all you need to do is
to increase the gain until you see
about =B1 2 counts of background noise.
Then you shall see about anything that sticks
its head above the grass.


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)



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No virus found in this incoming message.
Checked by AVG - www.avg.com=20
Version: 8.5.285 / Virus Database: 270.12.11/2089 - Release Date: =
04/30/09 17:53:00







Thank you =
Rodger, but what=20
does a count of 60 or a count of 100 mean specifically,........ a =
frequency or=20
amplitude measurment or something else?   Thanks again,=20
Ed.
 
 
 
.
----- Original Message ----- 
From: "rsparks" <rsparks@..........>
To: <psn-l@..............>
Sent: Thursday, April 30, 2009 7:07 =
PM
Subject: Re:Counts

Hi Geoffrey,

You raise an interesting question--What is =
the=20
"grass"?  

For some folks, it is the microseims apparently =
generated=20
by ocean waves and maybe atmospherics.  For others, it is local man =
made=20
noise.  For still others, it may be the electronics of the =
amplifier, or=20
noise from hinges or other seismometer  parts.

If your =
hinges and=20
electronics are reasonably quiet, you should be able to see much smaller =

vibrations "riding" on the traces from the microseims.  I like =
counts of 60=20
to 100 for the microseims so that I can see small local quakes that are =
of=20
higher frequency than the micoseims but much smaller magnitude.  =
Counts=20
like this also pick up local noise but a quake looks a lot different =
from a car=20
going by.

BTW, I am using the Saum system that uses a  16 =
bit A/D=20
and has a peak count of +/- 32768.

Roger

Geoffrey=20
wrote:
Subject: Re: Counts
From:    "Geoffrey"=20
<gmvoeth@...........>
Date:    Wed, 29 Apr 2009 19:36:36 =
-0700

Im=20
not sure what you guys are talking about
BUT I thought all you need =
to do=20
is
to increase the gain until you see
about =B1 2 counts of =
background=20
noise.
Then you shall see about anything that sticks
its head =
above the=20
grass.


_______________________________________________________=
___

Public=20
Seismic Network Mailing List (PSN-L)

To leave this list email =
PSN-L-REQUEST@.............. with=20

the body of the message (first line only): unsubscribe
See =
http://www.seismicnet.com/maillist.html for more information.




No virus found in this incoming=20
message.
Checked by AVG - www.avg.com =

Version:=20
8.5.285 / Virus Database: 270.12.11/2089 - Release Date: 04/30/09=20
17:53:00