Guralp Systems CMG-3ESPCD - Manual (Page 95)

CMG-3ESPCD Digital Broadband Seismometer Appendix B - Sensor Specifications
9 Appendix B - Sensor Specifications
Hybrid sensors Velocity output bandwidth 0.1 – 50 Hz
HPF output flat to acceleration 100 seconds - spec*
HPF output flat to velocity
spec – 50 Hz*
Mass position output DC – 0.1 Hz
Velocity sensitivity 1400 V/ms -1
Acceleration sensitivity 2000 V/ms -2
Velocity sensors Velocity output bandwidth spec – 50 Hz*
Mass position output DC to spec Hz*
Velocity sensitivity 2 × 750 V/ms -1
Mass position sensitivity 1000 V/ms -2
Controls Mass locking and unlocking Remotely operated
Mass centring Manual and/or automatic
Mechanics and
electronics Sensors 3 orthogonal sensors,
each 0.180 kg
Lowest spurious resonance above 140 Hz
Sensor transducer type capacitive displacement
Feedback transducer type magnet/coil
Connector pressure tight
Temperature range with
masses locked
–35 to +75 °C
Operational temperature range –20 to +65 °C**
Power Supply voltage 10 – 36 V
Current at 12 V DC 75 mA†
... during calibration 100 mA†
... during centring (average) 330 mA†
... during locking/unlocking 490 mA†
* spec refers to the quoted frequency response value, e.g., for a “30 s”
sensor, the value of spec would be 30 s = 0.033 Hz.
** Temperatures below –20 °C may be accommodated with additional
care. Please consult Güralp Systems for advice.
† Because centring, locking, and unlocking consume varying amounts of
power, it is recommended that you use a power supply capable of delivering
1 A at 12 V.
MAN-C3E-0002 95 Issue B - November 2013