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Geode Portable Seismograph Module Specifications

 

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 95/98/NT.

 

 

 

 

 

 

Notes:

Laptop computers are NOT field devices! They are easily damaged by harsh treatment or exposure to extreme environments. They have a short battery life. Geometrics StrataVisor NZ is designed to operate in harsh conditions for extended periods and should be used with the Geode for professional surveys when  reliability is important.

Additional with MGOS software.


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  Seismographs                                  Geode             
  

 

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