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Geometrics Geode

geodeGeode: The new Geode seismic recorder is the next generation of seismic recording system, combining the best of Geometrics' traditional seismic recorders with the flexibility and convenience of a distributed system. It's ideal for refraction or reflection, downhole or VSP - even topography surveys. For light-duty applications, you can run the Geode from your laptop to view, record, and process your data. The software interfaces to the Geode as a simple high-speed network device, eliminating the need for special drivers and cards. 

Available with 3 to 24 channels per module; connect more modules to build low cost distributed systems up to 1000 channels.

Geodes seismic modules are controlled by an external computer via an industry-standard network interface. Suitable control computers include an inexpensive laptop, a desktop computer, an industrial rack mount computer, or Geometrics field-hardened StrataVisor NZ seismograph.

Geodes can be operated from computers running Windows NT, 98, ME, W2K and XP. No special drivers are required to run a Geode other than what comes standard with your network card.

A/D Conversion: 24 bit result using Crystal Semiconductor sigma-delta converters and Geometrics proprietary oversampling.   DynamicRange:144 dB (system), 110 dB (instantaneous, measured) at 2ms, 24dB.
Distortion: 0.0005% @ 2 ms, 1.75 to 208 Hz.   Bandwidth:1.75 Hz to 20 kHz. Low corner frequency option available.
Common Mode Rejection:> -100 dB at <=100 Hz, 36 dB.   Crosstalk: -125 dB at 23.5 Hz, 24 dB, 2 ms.
Noise Floor: 0.2uV, RFI at 2 ms, 36 dB, 1.75 to 208 Hz.   Stacking Trigger Accuracy: 1/32 of sample interval.
Maximum Input Signal: 2.8 VPP.   Input Impedance: 20 kOhm, 0.02 uf.
Preamplifier Gains: SGOS software enables selectable gain pair of either 24 or 36 dB. MGOS software selection between jumpered gain pair 12 and 24 dB, gain pair 24 and 36 dB, or 0dB.   Anti-alias Filters: -3 dB at 83% of Nyquist frequency, down 90 dB.
Pre-trigger Data:Up to 4,096 Samples. Optional event detection software enables system for earthquake, vibration monitoring.   Sample Interval:0.02, 0.3125, 0.0625, 0.125, 0.25, 0.5, 1.0, 2.0, 4.0, 8.0, 16.0 ms.
Record Length:16,000 samples standard, 64,000 samples optional 2   Delay:0 to 9999 ms in 1 ms steps.
DataTransmission:Uses reliable Ethernet connections and requires no custom transmission software. Interfaces directly with network capabilities of Windows 95/98/NT.   AuxiliaryChannels:All Geode channels can be programmed as either AUX or DATA. Fixed data aux channels available in StrataVisor DZ.
Instrument Tests:Optional built-in daily, weekly and monthly testing available. External laboratory quality oscillator available to measure noise, crosstalk, dynamic range, gain similarity and trigger accuracy to factory specification  

Acquisition and DisplayFilters:

  • LowCut:OUT, 10, 15, 25, 35, 50, 70, 100, 140, 200, 280, 400 Hz, 24 or 48  dB/octave, Butterworth.
  • Notch:50, 60, 150, 180 Hz and OUT, with the 50 dB rejection bandwidth 2% of center frequency.
  • HighCut:OUT, 250, 500 or 1000 Hz, 24 or 48 dB/octave.
LineTesting:Real time noise monitor displays real-time output from geophones. Optional geophone pulse test helps identify bad geophones and shorted or broken cables.
Data Storage:Stores data locally on laptop hard drive for transfer to portable media . Additional tape options available. 2
Triggering:Positive, negative or contact closure, software adjustable threshold.   Data Formats:SEG-2 standard with SGOS. SEG-D and SEG-Y available. 2
Power:Requires 12V external battery. Uses 0.65 W/channel during acquisition, sleep mode reduces power consumption by 70% while in standby.   Plotters:Drives a variety of NT compatible printers including Printrex 4, 8  and 12 inch plotters. Consult factory.
Environmental:-30 to 75 degrees C. Waterproof and submersible. Withstands a 1 m drop onto concrete on 6 sides and 8 corners.   Operating System:Windows XP/W2K/ME/98/NT. An older, limited feature version of the software is available for 95.

 

Sales enquiries should be directed to:
norman@allied-associates.co.uk

Rentals enquiries should be directed to:
rentals@allied-associates.co.uk

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Allied Associates
Concept House, 8 The Townsend Centre, Blackburn Road,
Dunstable, Bedfordshire, ENGLAND, LU5 5BQ
Telephone: +44 (0) 1582 606 999
Facsimile: +44 (0) 1582 606 991