Dale,  I will email Jim at the school, and they can do this for =
sure............Thanks
  ----- Original Message -----=20
  From: Dale Hardy=20
  To: psnlist@.................
  Sent: Thursday, October 21, 2010 2:54 AM
  Subject: RE: Negative clipping in AmaSeis


  Hi Ted,

  You need to be sure that a negative voltage is being generated by the =
sensor.

  One simple way to test the DataQ device is to apply 1.5v, ( dry cell =
battery ) to the DataQ unit, observe the deflection in Amaseis  then =
reverse the polarity and the deflection should be opposite but equal.

  =20

  Regards

  Dale

  =20


-------------------------------------------------------------------------=
-----

  From: psnlist-request@.............. =
[mailto:psnlist-request@............... On Behalf Of Ted Channel
  Sent: Thursday, 21 October 2010 11:17 AM
  To: psnlist@..............
  Subject: Negative clipping in AmaSeis

  =20

  Hi Folks,   I have used DataQ194 ad converters, and 158.   Big price =
differences so I use more of the 194.

  =20

  Mostly they work fine.   However from time to time a system will have =
negative clipping, nothing below zero, unless you jump close to the =
machine and then is shows negative values.

  =20

  We installed a new system, in a school three hours away.    They =
recorded their first earthquake, but because of the clipping the data is =
useless.   It carrys over into Winquake and filtering does nothing to =
improve it.

  =20

  I had a similar problem, changed the 194, and install a 158 the =
problem went away.   Reinstalled the 194, the problem returned.   I =
wanted to try a new 194, but did not have one.

  =20

  Can anyone help........Have you see something similar?....could it be =
the set up procedure in Windata, which comes with the 194.   It has a =
set up window for values, and should be set to +10 volts and -10 volts.

  =20

  I don't think it is the sensor.

  I don't think it is Amaseis or Winquake.

  I don't think it is the computer.

  I don't think it is the cables......

  =20

  Thanks, Ted







Dale,  I will email Jim at the =
school, and=20
they can do this for sure............Thanks

  
----- Original Message ----- 
  From:=20
  Dale =
Hardy 
  
To: psnlist@.............. =

  
Sent: Thursday, October 21, =
2010 2:54=20
  AM
  
Subject: RE: Negative clipping =
in=20
  AmaSeis
  


  

  
Hi=20
  Ted,
  
You need to =
be sure=20
  that a negative voltage is being generated by the=20
  sensor.
  
One simple =
way to=20
  test the DataQ device is to apply 1.5v, ( dry cell battery ) to the =
DataQ=20
  unit, observe the deflection in Amaseis  then reverse the =
polarity and=20
  the deflection should be opposite but =
equal.
  
 
  
Regards
  
Dale
  
 
  

  

  

  
  
From: psnlist-request@webtronics=
..com=20
  [mailto:psnlist-request@............... On=20
  Behalf Of Ted Channel
Sent: Thursday, 21 October 2010 =
11:17=20
  AM
To:=20
  psnlist@..............
Subject: Negative clipping in=20
  AmaSeis
  
 
  

  
Hi Folks,   I =
have used=20
  DataQ194 ad converters, and 158.   Big price differences so =
I use=20
  more of the 194.
  

  
 
  

  
Mostly they work =
fine.  =20
  However from time to time a system will have negative clipping, =
nothing below=20
  zero, unless you jump close to the machine and then is shows negative=20
  values.
  

  
 
  

  
We installed a new =
system, in a=20
  school three hours away.    They recorded their first=20
  earthquake, but because of the clipping the data is =
useless.   It=20
  carrys over into Winquake and filtering does nothing to improve=20
  it.
  

  
 
  

  
I had a similar problem, =
changed=20
  the 194, and install a 158 the problem went away.   =
Reinstalled the=20
  194, the problem returned.   I wanted to try a new 194, but =
did not=20
  have one.
  

  
 
  

  
Can anyone =
help........Have you=20
  see something similar?....could it be the set up procedure in Windata, =
which=20
  comes with the 194.   It has a set up window for values, and =
should=20
  be set to +10 volts and -10 volts.
  

  
 
  

  
I don't think it is the=20
  sensor.
  

  
I don't think it is =
Amaseis or=20
  Winquake.
  

  
I don't think it is the=20
  computer.
  

  
I don't think it is the=20
  cables......
  

  
 
  

  
Thanks,=20
  =
Ted