Encardio-rite model ESDA-120S is a three component low noise
feedback, velocity output broadband seismometer. The Broadband Feedback seismometer is based on
an orthogonal three axis low noise sensor modules with double nested feedback
loop topology. The suspension system is based on the principles of “elastica”.
The mechanical sensor orientation is Non-Galperin with -75 dB cross axis
rejection on all axis.