USArray
A Continental-scale Seismic Observatory

Data Acquisition System

Signal conditioning is provided by the Data Acquisition System (DAS). The DAS consists of preamplifiers, Analog-to-Digital (A/D) converters, time signal receiver, on-site data storage, telemetry interface, and provides state-of-health information to both local and remote users.

Preamplifiers are necessary to condition and adjust the analog output of the sensor so as to match impedance and gain levels on the input to the A/D converter.

These new digitizers are designed to operate with minimal power (<1W) while still maintaining very low internal electronic noise characteristics.   The construction of these devices is designed for rugged , harsh outdoor environments.

Quanterra Q330 and Baler

  • 3 and 6 channels
  • Dynamic range >130 dB RMS
  • Self-noise less than 1 count RMS
  • 1W power consumption
  • Internal memory 8 Mb, 20 Gb on local disk
  • Weight 8 lbs
  • Cost (including on-site data storage and telemetry interface) $10,000

Reftek 130-01

  • 3 channels
  • Dynamic range >130 dB RMS
  • Self-noise less than 1 count RMS
  • 1W power consumption
  • Internal memory 2 Gb
  • Weight 4.5 lbs
  • Cost (including on-site data storage and telemetry interface) $9,000

Miniature Seismic Recorder DAS

Reftek "Texan"

  • 1-3 channels
  • Dynamic range 120 dB RMS
  • Self-noise several counts RMS
  • D-cell battery power
  • Weight 2.5 lbs