Guralp Systems Limited
MAN-C3E-0002 - Güralp 3ESPCD Digital Broadband Seismometer (DM24 Versions) - Users' Guide

PreviousNext

1. Preliminary Notes 2. Introduction 3. Installing the 3ESPCD 4. Calibrating the 3ESPCD 5. Using Scream! 6. Command line interface 7. Inside the 3ESPCD 8. Appendix A - Connector pin-outs 9. Appendix B - Sensor Specifications 10. Appendix C - Digitiser specifications 11. Revision History

Chapter 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.

PreviousNext

1. Preliminary Notes 2. Introduction 3. Installing the 3ESPCD 4. Calibrating the 3ESPCD 5. Using Scream! 6. Command line interface 7. Inside the 3ESPCD 8. Appendix A - Connector pin-outs 9. Appendix B - Sensor Specifications 10. Appendix C - Digitiser specifications 11. Revision History