Well here is a mystery.........I have used AmaSeis for years, thought I =
understood it completely, but I can't figure this out.

With everything set up and running normally, I unplugged a fully =
operation sensor, working perfectly.

I hooked up a coil and magnet, not a sensor, but just a coil and magnet =
balanced.  No surprises, the helicorder showed the trace above and below =
the line, when the magnet was moved.
At this point, again everything looked normal.   The AmaSeis trace =
numbers (show data values) would bounce from +100 to -100, so far so =
good.   However as the movement stopped, and the magnets/coil stopped =
moving, the (show data values) settled in to record just background =
numbers.   As an examples, +10 to -18,  BUT the negative number would =
never go lower than -18. Unless I touched the device.

I recorded 30 mins of background noise.  Everything above the line (+) =
look normal, you could see all the normal variations  up and down, up =
and down.  Below the AmaSeis trace line (negative numbers) all the marks =
were clipped at about -18.

To make this more interesting, I copied this 30 mins trace and opened it =
in Winquake.......There to my surprise, when viewing the (data points) =
it showed that it contained all the + and all the - count, showing no =
clipping at all.

After uninstalling AmaSeis, and trying 10 other things, nothing =
corrected the problem.   Plugged in the original sensor and the clipping =
was gone.  Plugged in the problem coil and magnet and the problem was =
back.

More interesting still, once I turn on the AmaSeis filter 1-20 seconds =
the clipping disappeared.

I am using data Q194.   In AmaSeis I tried different device setting, =
gains, all that stuff, and nothing corrected the helicorder but applying =
the filters.

I have no ideas............If I use the filter settings in AmaSeis for =
this new device there is no problem, it all looks 100% normal and =
recorded every footstep up and below the trace line.   If I remove the =
filter the negative clipping on the helicorder returns.










Well here is a mystery.........I have =
used AmaSeis=20
for years, thought I understood it completely, but I can't figure this=20
out.
 
With everything set up and running =
normally, I=20
unplugged a fully operation sensor, working perfectly.
 
I hooked up a coil and magnet, not a =
sensor, but=20
just a coil and magnet balanced.  No surprises, the helicorder =
showed=20
the trace above and below the line, when the magnet was =
moved.
At this point, again everything looked=20
normal.   The AmaSeis trace numbers (show data =
values) would=20
bounce from +100 to -100, so far so good.   However as the =
movement=20
stopped, and the magnets/coil stopped moving, the (show data values) =
settled in=20
to record just background numbers.   As an examples, +10 to =
-18, =20
BUT the negative number would never go lower than -18. Unless I touched =
the=20
device.
 
I recorded 30 mins of background =
noise. =20
Everything above the line (+) look normal, you could see all the normal=20
variations  up and down, up and down.  Below the AmaSeis trace =
line=20
(negative numbers) all the marks were clipped at about -18.
 
To make this more interesting, I copied =
this 30=20
mins trace and opened it in Winquake.......There to my surprise, when =
viewing=20
the (data points) it showed that it contained all the + and all the - =
count,=20
showing no clipping at all.
 
After uninstalling AmaSeis, and trying =
10 other=20
things, nothing corrected the problem.   Plugged in the =
original=20
sensor and the clipping was gone.  Plugged in the problem coil and =
magnet=20
and the problem was back.
 
More interesting still, once I turn on =
the AmaSeis=20
filter 1-20 seconds the clipping disappeared.
 
I am using data Q194.   In =
AmaSeis I=20
tried different device setting, gains, all that stuff, and nothing =
corrected the=20
helicorder but applying the filters.
 
I have no ideas............If I use the =
filter=20
settings in AmaSeis for this new device there is no problem, it all =
looks 100%=20
normal and recorded every footstep up and below the trace =
line.   If I=20
remove the filter the negative clipping on the helicorder =
returns.
 
 
 
Thanks, Ted