A seismometer is a device for measuring the movement of the earth. It consists of a ground motion detection sensor coupled with a recording system.
The Cpz 90 is a short period horizontal seismometer
"Short period" Seismometers (less than 2 seconds) are mainly used to study the volume waves (compression waves or P waves, shear waves or S waves) and the nearby and regional seismicity.
Cpz 90 seismometers use a measuring system based on magnet and coil: a coil attached to the moving mass oscillates in a magnet fixed to the frame. This system allows the measurement of the speed of ground motion for frequencies above the resonant frequency of the device.
|∅ 150 mm / H 320 mm / Weight 5.7 kg|
|-20° to +60°|
|Natural frequency||f0 = 1 Hz, adjustable from 0.6 to 1.4 Hz|
|Mechanical damping||< 0.01 for f0 = 1 Hz|
|10 Hz noise level at input: 30 pm.s-1 / √Hz|