Seismology

• Extremely low noise preamplifier for electrodynamic seismometers - noise less than 6 nV DC - 100Hz
• 1Hz borehole seismometer / accellerometer module
• Patented low noise seismometer preamplifier (also available with internal  power supply - runs 5 years on internal battery)
• By using one of the above preamplifiers,
  1 Hz Seismometers have a broadband sensitivity good enough to be useful down to 20sec or even longer periods.  This is due to a patented low noise damping circuit with noise levels a factor of 2 - 5 below that of conventional amplifiers
  At frequencies above 1Hz noise levels are more than one oder of magnitude below the STS-1 or STS-2 seismometers
  (system resolution to 4*10E-11m/sec/Hz^1/2 )
• Active seismometers are produced in license since 15 years by lennartz electronic:
  www.lennartz-electronic.de