Güralp 40TDE datasheet - Guralp Systems Ltd

1 G ralp 40 TDE. PORTABLE BROADBAND DIGITAL SEISMOMETER. 300 mm 168 mm A rugged and robust Key features three-component digitial Self-contained broadband triaxial seismometer (40T) with broadband seismometer digitiser and data-logger (DM24S3 EAM) in a single waterproof stainless steel case with fully adjustable levelling feet The G ralp 40 TDE is a true broadband, force- Flat frequency response from 60 s ( Hz) to 100 Hz with feedback seismometer. The 40 TDE is ideally suited other response options available. for semi-permanent installations. The integrated No mass locking required - plug in and go digitiser and embedded communications module The high-gain feedback loop eliminates mechanical provide on-board and external storage options, a nonlinearity (the overall measured linearity exceeds 90 dB) and convenient web-based user interface and multi- minimises resonance in the spring system protocol communications over serial and Ethernet Low-frequency vibration modes are carefully avoided in the connections.

2 The stainless steel casing protects design. The lowest spurious vibration mode of the 40T sensor the instrument in some of the harshest deployment is a barely measureable resonance at 450 Hz environments. Low self noise results in over 145 dB dynamic range across a wide frequency band Applications Cross axis rejection over 62 dB; sensor axes orthogonal to within +/- . >> Rapid temporary seismic deployments Supplied with 16 GB of on-board Flash memory storage, with aftershock and volcanic unrest monitoring option to increase up to 64 GB. >> Post-hole and direct burial installations Communication includes Ethernet and Serial with a host of >> Regional and national seismic networks options such as GSM or VSAT.

3 >> Microseismic monitoring >> Passive seismic imaging Fast data download over Ethernet or USB. Real-time data streaming protocols include: SEED link, , GCF (SCREAM!) - fully compatible with SeisComp3, Images: Guralp 40 TDE digital seismometer Earthworm, Antelope analysis packages G ralp 40 TDE. SPECIFICATIONS. SENSOR: G RALP 40T BROADBAND SEISMOMETER DIGITISER / DATA-LOGGER: G RALP DM24S3 EAM. SENSOR SYSTEM USER INTERFACE / SOFTWARE. Technology Force feedback (force balance) velocity sensor Digitiser control and Platinum software (via web browser). configuration G ralp Scream! software (free download). Configuration / Topology Triaxial orthogonal (ZNE).

4 Terminal window over SSH or serial link SENSOR PERFORMANCE. Triggering modes STA/LTA, level, per-channel & network voting Velocity output band 60 s ( Hz) to 100 Hz standard REAL-TIME DATA COMMUNICATION. (flat response within -3 dB. 30 s ( Hz) or 1 s to 100 Hz options available crossing points) Protocols Scream! (GCF); SEED link; ; GDI-link Contact G ralp to discuss other frequency Latency s digitisation delay at 250 sps response options 1 s transmission delay at 250 sps (GCF protocol). Sensitivity 60 s and 30 s to 100 Hz: ON-BOARD DATA STORAGE. 3200 V/ms (2 x 1600 V/ms ) differential standard Data storage file formats GCF; miniSEED. output Internal storage capacity Flash memory storage options available up to 64 GB.

5 1 s to 100 Hz option: 2000 V/ms (2 x 1000 V/ms ) Data retrieval interfaces Storage accessible via GPIO port (appears as USB. differential standard output drive); or secure file transfer ( sftp). Contact G ralp to discuss alternative high Expandable storage Optional hot-swappable USB armoured canister sensitvity (high gain) options (various sizes available). Self-noise of sensor below 7 s ( Hz) to 4 Hz* TIMING. NLNM (New Low Noise *Independently tested value - see Tasic & Runovc Timing system Internal VCXO clock Model; Peterson; 1993, USGS) (2012), Journal of Seismology Timing sources GNSS (GPS, GLONASS); NTP (Network time protocol). Sensor dynamic range 148 dB @ 1 Hz (at standard output sensitivity) 151 dB @ 5 Hz Timing accuracy GNSS unlocked: <100 s drift per day at 40 sps Cross axis rejection 65 dB STATE-OF-HEALTH.

6 Linearity >90 dB Parameters available Sensor mass positions, digitiser temperature, digitiser voltage and current Lowest spurious resonance 450 Hz CONNECTORS. Damping 70% of critical Connector types Power/data: 19-pin military specification bayonet Operating tilt range GNSS: 10-pin military specification bayonet SENSOR MASS CONTROL USB: 6-pin military specification bayonet GPIO: 12-pin military specification bayonet Sensor mass positions Three independent outputs (single-ended) Ethernet: 6-pin military specification bayonet Mass locking No mass locking required POWER. CALIBRATION CONTROLS Power supply voltage 11-30 V DC*. Calibration signal types Sine, step or broadband (adjustable amplitude and Power consumption Without GNSS and Ethernet: W.)

7 Frequency) (at 12 V DC) With GNSS or Ethernet: W. DIGITISER PERFORMANCE With GNSS and Ethernet: W. Digitiser type Fourth-order sigma-delta *Power voltage for operation of this unit only. Connection to additional instrumentation or use of longer cables may result in a higher input voltage requirement. Digitiser resolution 24-bit ENVIRONMENTAL / PHYSICAL. Dynamic range 140 dB at 20 sps 136 dB at 40 sps Operating temperature range -20 to +75 C. 135 dB at 80 sps Operating humidity range 0-100% relative humidity Sample rates 1 to 1000 sps (up to four simultaneous streams wih Enclosure ingress protection IP68 - protection against effects of prolonged different sample rates available) immersion under pressure at 3 m depth for 72 hours Gain options Unity (1 ) only Enclosure material Stainless steel case; O-ring seals throughout Digital filter types FIR (linear phase) and IIR options available Height With handle: 300 mm Decimation filters 2; 4; 5; 8.

8 10 Without handle: 245 mm Anti-aliasing filter at Nyquist 160 dB Diameter 168 mm Absolute accuracy < Weight kg Input impedance 117 k Alignment Bubble level on lid; north arrow on handle and base;. adjustable feet Crosstalk (out of band 140 dB. rejection) SUPPORTING DOCUMENTATION. Linearity 110 dB at 80 sps Calibration values Measured sensor sensitivity, frequency response, instrument poles & zeros, digitiser sensitivity and Common-mode rejection ratio 80 dB test results enclosed Full user's guide Available online at: G ralp Systems Limited T +44 118 981 9056 In the interests of continual Midas House F +44 118 981 9943 improvement with respect to design, Calleva Park E reliability, function or otherwise, all Aldermaston product specifications and data are subject to change without prior notice.

9 Reading RG7 8EA. United Kingdom DAS-040-0004 Issue G.