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

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



Name is Paul, and I am located=20=
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/~b=
raile/indexlinks/as1.htm



       You don't say what system you are runni=
ng. 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 th=
e expensive Dataq higher end models.



       Assuming that you have a Lehman, the pr=
oblem is that you also have to record the ~6 second Atlantic Ocean microseis=
ms which are typically ~2 microns, but may be up to 15 or down to 0.5 micron=
s. 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 envior=
onmental noise? You can filter out the large 6 sec signal OK, but you usuall=
y have to record it in the first place. It is possible to fit a twin Tee rej=
ect filter to remove the 6 second signal before the ADC. Amateur seismologis=
ts 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 comput=
er 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 da=
y and are pretty useless.



       Hope that this helps.



       Chris Chapman