Hi Folks,  I have two vertical sensors in test, both using Larry's one =
channel board and DATAQ adc.   One of the boards is set for low gain and =
one is set for high gain, using the jumper.

The first earthquake records was the 5.6m in Mexico April 27th.   Not =
unexpected the counts on the one using high gain was 10x the one using =
low gain.   Something like 70 vs 700.

Both traces looked fine and I could see little different, aside for the =
counts.   My question is what should my count target be?   Someone may =
have indicated about 100 to 300 counts during the quiet of night?

The reason I ask is I see data files posted with many using higher =
counts 700 or 800, instead of smaller numbers.    I know the higher gain =
feature on the board is for lower voltage output.   My coil and magnets =
are similar to Chris's quad magnet arrangement, and a coil of 4000 =
turns, so I have plenty of voltage.

I would like your opinions and why.









Hi Folks,  I have two vertical =
sensors in=20
test, both using Larry's one channel board and DATAQ adc.   =
One of the=20
boards is set for low gain and one is set for high gain, using the=20
jumper.
 
The first earthquake records was the =
5.6m in Mexico=20
April 27th.   Not unexpected the counts on the one using high =
gain was=20
10x the one using low gain.   Something like 70 vs =
700.
 
Both traces looked fine and I could see =
little=20
different, aside for the counts.   My question is what should =
my count=20
target be?   Someone may have indicated about 100 to =
300 counts=20
during the quiet of night?
 
The reason I ask is I see data files =
posted with=20
many using higher counts 700 or 800, instead of smaller=20
numbers.    I know the higher gain feature on the board =
is for=20
lower voltage output.   My coil and magnets are similar to =
Chris's=20
quad magnet arrangement, and a coil of 4000 turns, so I have plenty of=20
voltage.
 
I would like your opinions and =
why.
 
 
Thanks, Ted