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gDAS32 Technical and General Specifications

Technical Specifications

2 input channels

  • Independent 32 bit analogue-digital converters
  • Input voltage range: +/- 2.5 V (modifiable to +/- 26 V)
  • Maximum continuous input voltage limit: +/- 50 V
  • Maximum momentary input voltage limit: +/- 500 V
  • Input impedance: 20 MΩ
​
Maximum number of samples per time series record: 4 million [2²²] samples

Sample rate

  • User programmable
    • Maximum fs: 32 kHz, Time series record length = 128 secnds
    • Minimum fs: 8 Hz, Time series record length = 145 hours
  • Typical fs for MT acquisition:
    • 32 kHz, each time series record length = 128 seconds-
    • 2 kHz, each time series record length = 34 minutes
    • 128 Hz, each time series record length = 9 hours-
  • Typical fs for IP acquisition:•
    • 512 Hz, each time series record length = 2 hours

GPS synchronization

  • Maximum GPS error: 100 ns​
  • Typical (measured) GPS error: 10 ns ​

Calibration

  • Internal signal generator. +/- 20.48 mV, 0.5Hz for internal calibration and system check

Contact impedance

  • Measured prior to each acquisition and on user command

Memory / Storage

  • Internal pen drive: 8 Gb provides for 200 typical time series filed
  • Typical time series file (2 channels, 4 M samples): 35 Mb
  • Time series data files: simple 32-bit binary
  • Data download: USB cable or removal of pen drive
  • Data available for download during acquisition and turned off

Processors

  • Real time acquisition processor Microchip 32-bit 80 MHz
  • HMI Processors 32-bit ARM 200 Mhz with light Linux kernel

Power Source

  • External battery: 9 to 22 V
    • Battery type according to application with/without solar panel
  • Consumption during acquisition:
    • Bluetooth on: 200 mA (12 V supply)
    • Bluetooth off: 145 mA (12 V supply)
    • XBee external radios: to be defined

General Specifications

Dimensions & weight

  • External Pelican case with connectors
    • 215 x 175 x 100 mm, 1.2 kg
  • Internal electronics and housing
    • 190 x 124 x 45 mm, .4 kg

User interface

  • No screen or buttons
  • 2 powered RS232 ports, 9600 baud rate
    • Internal port for Bluetooth
    • External port for XBee (or similar) radio
    • Output compatible user-friendly real-time text updated at 1 Hz with status information
    • Other comms:
      • User can send real-time commands (start acquisition, abort, calibrate, contact resistance, etc)
      • Receive 3-day history of acquisition and system information
      • Receive a 30s record of binary fs = 256 Hz time series data (non-terminal compatible)
  • Schedules (acquisition & communication) and ADC configuration
    • User updated by copying a text file to the USB and rebooting gDAS32
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