Guralp-systems CMG-1T Instrukcja Użytkownika Pobierz pdf (Strona 21)

Operator’s Guide CMG-1T Ocean Bottom

Seismometer

September, 1999, Issue C Section 4,

Page 1

4. THE FORCE TRANSDUCER

Force feedback seismometers which use a coil and magnet system to generate

the restoring feedback force are inherently dependent on the constancy of the

field strength produced in the force transducer. The design of the magnetic

circuit and the magnet/pole assembly is such that the field strength from the

feedback transducer is constant over large deflections and current levels.

Tests have shown that the mechanical suspension system and the electronics of

the CMG-3NSN is linear to better than 107 db (measured at ASL during USGS

National Network evaluation in 1989).

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Guralp-systems CMG-1T Instrukcja Użytkownika Strona 21