Hello Frank, We currently have a BB-13 setup and running using Larry C's A-D board, filters, and WinSDR. It takes a bit of work to get the setup correct, = and then to keep the mass centered. The BB-13 is very sensitive to thermal changes and will drift hundreds of mv. with just a few degrees of temperature change. Preferred mass centering is +/- 30 mv., and the = only way to achieve this is putting the instrument in a thermally stable = environment. Another thing to watch out for is not to turn the mass centering screw = too far as the spring guide pin will come out of the guide, causing damage = to the flexures. The BB-13 is capable of running in master or slave mode when there are multiple BB-13's (Z,E,N), but when running a single unit the jumpers = must be set for master operation. To see some recent events recorded using the BB-13 (OCO2Z) checkout = Larry's "Recent Events" page and look for the Omniplex OCO2Z sensor ID. http://www.seismicnet.com/cgi-dos/event.exe The BB-13 seismograph is in the shadow zone of the 7.0 Halmahera event yesterday but clearly recorded wave periods from 2 to 28 seconds. Greg Christenson NEIC station code OCO Omniplex Science Museum http://www.omniplex.org/OCOdata -----Original Message----- From: Frank Gentges K=D8BRA [mailto:fgentges@.................. Sent: Monday, May 26, 2003 11:59 AM To: PSN-L@.............. Subject: Teledyne Geotech BB13 Seismometer Hi, I have had an interest in setting up a seismograph for some time. That = interest was suddenly fired into full force when I happened upon a = Teledyne=20 Geotech BB13 broadband sensor on a hamfest swap table several weeks = ago. I=20 am now working on a seismograph setup in my spare time. ....RE: Teledyne Geotech BB13 Seismometer Hello Frank,
We currently have a BB-13 setup and running using = Larry C's A-D board, filters, and WinSDR. It takes a bit of work to get = the setup correct, and then to keep the mass centered. The BB-13 is = very sensitive to thermal changes and will drift hundreds of mv. with = just a few degrees of temperature change. Preferred mass centering is = +/- 30 mv., and the only way to achieve this is putting the instrument = in a thermally stable environment.Another thing to watch out for is not to turn the = mass centering screw too far as the spring guide pin will come out of = the guide, causing damage to the flexures.
The BB-13 is capable of running in master or slave = mode when there are multiple BB-13's (Z,E,N), but when running a single = unit the jumpers must be set for master operation.
To see some recent events recorded using the BB-13 = (OCO2Z) checkout Larry's "Recent Events" page and look for = the Omniplex OCO2Z sensor ID. http://www.seismicnet.com/cgi-dos/event.exe=
The BB-13 seismograph is in the shadow zone of the = 7.0 Halmahera event yesterday but clearly recorded wave periods from 2 = to 28 seconds.
Greg Christenson
NEIC station code OCO
Omniplex Science Museum
http://www.omniplex.org/OCOdata
-----Original Message-----
From: Frank Gentges K=D8BRA [mailto:fgentges@..............= A>]
Sent: Monday, May 26, 2003 11:59 AM
To: PSN-L@..............
Subject: Teledyne Geotech BB13 Seismometer
Hi,
I have had an interest in setting up a seismograph = for some time. That
interest was suddenly fired into full force when I = happened upon a Teledyne
Geotech BB13 broadband sensor on a hamfest swap = table several weeks ago. I
am now working on a seismograph setup in my spare = time....