In a message dated 2008/07/09, gel@................. writes:

> I connected my first Lehman to the electronics last night and receiving=20
> data. It looks just like a seismograph should.=20

Hi Gary,

       Well done!

Now the next question is: what is the best method to adjust the gain of the=20
> amplifier-A/D converter (I have Larry=E2=80=99s boards). Do I wait to rece=
ive some=20
> substantial events and then make adjustments.=20

       I set the gain initially so that the ocean microseisms are about 100=20=
/=20
200 counts in 'quiet' conditions. You may want to record quakes which have=20
1/10 the amplitude of the background.

Also, is there any consensus (probably not) on desired format for the=20
seismometer=20
> display. I=E2=80=99m using 4 traces of 10 minutes each at this time.

       Most folks use a 24 line x 1 hr 'drumplot' display. You can view the=20
last 24 hrs activity at a glance and then extract any section which has an=20
earthquake on it for further analysis. You can also set display filters to i=
gnore=20
the microseism background.

       Regards,

       Chris Chapman  =20
In a me=
ssage dated 2008/07/09, gel@................. writes:



I connected my first Lehman to=20=
the electronics last night and receiving data. It looks just like a seismogr=
aph should. 




Hi Gary,



       Well done!



Now the next question is: what is the best method to adjust the gain of the=20=


amplifier-A/D converter (I hav=
e Larry=E2=80=99s boards). Do I wait to receive some substantial events and=20=
then make adjustments. 




       I set the gain initially so that the o=
cean microseisms are about 100 / 200 counts in 'quiet' conditions. You may w=
ant to record quakes which have 1/10 the amplitude of the background.



Also, is there any consensus (probably not) on desired format for the seismo=
meter 

display. I=E2=80=99m using 4 t=
races of 10 minutes each at this time.




       Most folks use a 24 line x 1 hr 'drumpl=
ot' display. You can view the last 24 hrs activity at a glance and then extr=
act any section which has an earthquake on it for further analysis. You can=20=
also set display filters to ignore the microseism background.



       Regards,



       Chris Chapman