Chris...

Whoops.... It appears that you may be significantly further to the east of
me here in the states.
And a lot busier man than I thought. A quick search of the internet yielded
some interesting results.

I will try to formulate my questions as concisely as possible so as not to
have an undue burden

Thank you Chris

PauLC
W1VLF


  -----Original Message-----
  From: psn-l-request@.............. [mailto:psn-l-request@.................
Behalf Of ChrisAtUpw@.......
  Sent: Saturday, March 31, 2007 11:10 AM
  To: psn-l@..............
  Subject: Re: New to list and need some help


  In a message dated 2007/03/31, Paulc@........ writes:


    Name is Paul, and I am located in Harwinton CT.

    Just go on the list, thanks to John Cole and saw the post on AmaSeis.

    I have a Dataq 194 that I have been using with the manufacturers
software
    with my instrument.

    Being new I was/am very excited to hear about AmaSeis and it's ability
to
    work it the 194.

    But I must have something wrong here in the setup as I cannot get
correct
    time, cannot zero, etc.


  Hi Paul,

         Go to http://www.scieds.com/spinet/pdf/AS1AmaSeis.pdf download and
print the manual.
         Also visit http://web.ics.purdue.edu/~braile/indexlinks/as1.htm

         You don't say what system you are running. The 10 bit DI-194 is
short on range for seismic work. Dataq were selling 12 bit DI-154s for $39.
There are other ADCs available much cheaper than the expensive Dataq higher
end models.

         Assuming that you have a Lehman, the problem is that you also have
to record the ~6 second Atlantic Ocean microseisms which are typically ~2
microns, but may be up to 15 or down to 0.5 microns. This restricts your
ability to detect the smaller quakes which may be 0.1 micron. 10 bits is
only +/-500 counts. You may also be restricted by envioronmental noise? You
can filter out the large 6 sec signal OK, but you usually have to record it
in the first place. It is possible to fit a twin Tee reject filter to remove
the 6 second signal before the ADC. Amateur seismologists often use 16 bit
ADCs.

         The 0 V on the ADC may not be 0 counts. It is usual to fit an
amplifier with a zero trim control to set the digital zero. If I remember
correctly, you can put a digital offset into Amaseis.

         The Amaseis time is that on your computer software clock. It may be
corrected by setting up on-line correction
    http://www.arachnoid.com/abouttime/

  Software ''clocks'' may have an error of over 30 seconds per day and are
pretty useless.

         Hope that this helps.

         Chris Chapman






Chris...
 
Whoops.... It appears that you may be significantly further to =
the east=20
of me here in the states.
And a=20
lot busier man than I thought. A quick search of the internet yielded =
some=20
interesting results.
 
I will=20
try to formulate my questions as concisely as possible so as not to have =
an=20
undue burden
 
Thank=20
you Chris
 
PauLC
W1VLF
 
 

  
-----Original Message-----
From: =
psn-l-request@.................
  [mailto:psn-l-request@...............On Behalf Of=20
  ChrisAtUpw@.......
Sent: Saturday, March 31, 2007 11:10=20
  AM
To: psn-l@..............
Subject: Re: New to =
list and=20
  need some help

In a message dated 2007/03/31, Paulc@........ =
writes:


  Name is Paul, and I am located in Harwinton =
CT.

Just go=20
    on the list, thanks to John Cole and saw the post on =
AmaSeis.

I have=20
    a Dataq 194 that I have been using with the manufacturers =
software
with=20
    my instrument.

Being new I was/am very excited to hear about =
AmaSeis=20
    and it's ability to
work it the 194.

But I must have =
something=20
    wrong here in the setup as I cannot get correct
time, cannot =
zero,=20
  etc.


Hi =
Paul,

      =20
  Go to http://www.scieds.com/spinet/pdf/AS1AmaSeis.pdf download and =
print the=20
  manual.
       Also visit=20
  =
http://web.ics.purdue.edu/~braile/indexlinks/as1.htm

  &=
nbsp;   =20
  You don't say what system you are running. The 10 bit DI-194 is short =
on range=20
  for seismic work. Dataq were selling 12 bit DI-154s for $39. There are =
other=20
  ADCs available much cheaper than the expensive Dataq higher end=20
  models.

       Assuming that you =
have a=20
  Lehman, the problem is that you also have to record the ~6 second =
Atlantic=20
  Ocean microseisms which are typically ~2 microns, but may be up to 15 =
or down=20
  to 0.5 microns. This restricts your ability to detect the smaller =
quakes which=20
  may be 0.1 micron. 10 bits is only +/-500 counts. You may also be =
restricted=20
  by envioronmental noise? You can filter out the large 6 sec signal OK, =
but you=20
  usually have to record it in the first place. It is possible to fit a =
twin Tee=20
  reject filter to remove the 6 second signal before the ADC. Amateur=20
  seismologists often use 16 bit=20
  ADCs.

       The 0 V on the ADC =
may not=20
  be 0 counts. It is usual to fit an amplifier with a zero trim control =
to set=20
  the digital zero. If I remember correctly, you can put a digital =
offset into=20
  Amaseis.

       The Amaseis time =
is that=20
  on your computer software clock. It may be corrected by setting up =
on-line=20
  correction=20
  http://www.arachnoid.com/abo=
uttime/
Software=20
  ''clocks'' may have an error of over 30 seconds per day and are pretty =

  useless.

       Hope that this=20
  helps.

       Chris=20
Chapman