PSN-L Email List Message
Subject: RE: New to list and need some help
From: "Paul Cianciolo" Paulc@........
Date: Sat, 31 Mar 2007 14:06:52 -0400
Hello Chris,
Yes... all of that helped.
I missed that link somehow.
Thank you very much, I got it and printed.
The DI- 194 is a 10 bit interface covering 10 to -10 volts.
For some reason it has a .078 volt offset, even with the input shorted.
Need to look at the calibration routine.
Before I buy another A/D... Let me know what you think..
First you mentioned the DI 154... was the serial version of the DI-158U??
Cannot seem to find it on the Dataq page.
Also I have an older... PC-711S and DOS software. That is 12 bit board but
I am not sure I have a box old enough to run it on.
And I would like to stay compatable.
So who are the other companies that make the ADC's you speak of.
Chris any chance I could give you a call some time? I have other questions
and it takes for ever for me to type.
Yes... its a Lehman type with about 25 sec period for 1 cycle...
More comments on your email in a little bit
Let me know if a call would be OK with you
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
Hello=20
Chris,
Yes...=20
all of that helped.
I=20
missed that link somehow.
Thank=20
you very much, I got it and printed.
The=20
DI- 194 is a 10 bit interface covering 10 to -10=20
volts.
For=20
some reason it has a .078 volt offset, even with the input =
shorted. Need=20
to look at the calibration routine.
Before=20
I buy another A/D... Let me know what you =
think..
First=20
you mentioned the DI 154... was the serial version of the=20
DI-158U??
Cannot=20
seem to find it on the Dataq page.
Also I=20
have an older... PC-711S and DOS software. That is 12 bit board =
but I am=20
not sure I have a box old enough to run it on.
And I=20
would like to stay compatable.
So who=20
are the other companies that make the ADC's you speak =
of.
Chris=20
any chance I could give you a call some time? I have other =
questions and=20
it takes for ever for me to type.
Yes...=20
its a Lehman type with about 25 sec period for 1 =
cycle...
More=20
comments on your email in a little bit
Let me=20
know if a call would be OK with you
PauLC
W1VLF
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
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