LPHA is a long-period horizontal seismometers that measure ground motion from 1 to several hundred seconds, up to continuous waves. These seismometers are used to study seismic surface and body waves as well as earth natural periods (53 minutes), and the Earth tides (12 hours).
|400 mm x 210 mm, height 500 mm / 25 Kg|
|10 ° to +40° C|
|Mechanical natural period||T0 = 12 s|
|Mechanical damping||< 0.05|
|Feed back actuator||Magnet and coil|
|Calibration coil||220 Ω ± 40 Ω|
|ESTEREL unit Output||type 2 outputs, Single ended / maximum level 24 Vpp. into 10 KΩ load / integrated circuit board available Speed or displacement configuration|