This Broadband Seismometer, is a force-balance feedback sensor available with frequency bandwidth 0.0083 Hz (120 sec) - 50 Hz, and 0.016 Hz (60 sec) - 50 Hz flat to velocity. The seismometer contains three independent sensors (one vertical and two horizontal) with built-in electronic feedback circuit, control and power conversion circuits, featuring low noise, large dynamic range and easy installation and use.
The seismometer has built-in leveling and mass lock/unlock facilities. The leveling mechanism includes two bubble levels, three adjustable feet and three locknuts which are located on the seismometer’s chassis.
The seismometer has a built-in mass zero-position adjusting mechanism to perform automatic mass adjustment. As soon as the seismometer is powered it checks the zero position of each component’s mass and automatically adjusts the zero position if needed.
The seismometer is a low noise seismometer (see next tab for Power Spectral Density plot). The low self noise performance makes the BBVS-120 an ideal seismometer for local, regional, and global seismicity studies in different installation configurations, including observatory and portable, surface and posthole applications.
Force balance with capacitive displacement transducer
0.0083 Hz (120 sec) - 50 Hz, Model BBVS-120 0.0166 Hz (60 sec) - 50 Hz, Model BBVS-60