Experience with Earth Data Digitizers and Seislog

Jens Havskov

Department of Earth Science

University of Bergen

Norway

ESC Potsdam, September 2004

- UiB has used ED digitizers since around 1993

- Currently using old model EDM006 and newer model PS2400

- Digitizers have only been used with Seislog software

-Seislog for QNX-Seislog for Windows-Seislog for PocketPC

-A Seislog Linux is now being tested

Seislog system

Seislog is a general purpose data acquisition system running on different platforms. All system supports digitizers from 8-10 different manufactures.

QNX Seislog: In operation since 1995, support one digitizer at a time, records in Seislog format. About 100 currently in operation. No further software development.

Windows Seislog: In operation since 2000, supports several digitizers at the same time, records in SEISAN format, > 20 in operation.

WindowsCE Seislog: In operation since 2001, supports only one digitizer at a time, records in SEISAN format, > 5 in operation.

Linux Seislog: In operation since 2004, supports several digitizers at the same time, records in SEISAN format, 2 in test operation.

Old ED digitizer

3 Units in operation since 1995

One channel damaged in 9 years

Very stable

New ED digitizer

5 in operation in Norway since 1998

Stable operation, good S/N ratio

Several have been returned for repair

Sensitive to humidity, in Norway this has introduced instability in operation (1 s spikes, funny signals etc).

All are now indoors, which seemed to cure the problem

RS232 output will not work with a some PC’s

New ED digitizer in Guatemala, South Africa and Spain

Guatemala: Digitizers installed in field in well aired concrete houses, there has not been any problems since installation one year ago.

Spain and South Africa: Apparently working ok, have no detailed information.