Product Description

The NRU-1C™ is a self-contained nodal seismic recording unit with 1 channel of 24-bit digitization, internal and/or external battery, internal or external geophone, integrated high sensitivity GNSS/GPS, and high-speed USB data download. The unit is enclosed within a robust two-part, water-tight plastic assembly, held together with stainless steel locking rings, with two upper stainless steel MIM protrusions for charging the battery.

Product Features

  • GNSS-GPS, Glonass, Galileo
  • High speed data download via TransferJet™
  • Highly visible LED status
  • 10 Ah Li-ion battery <100mW power consumption
  • Unit/sensor status via BLE™ (Bluetooth Low Energy)
  • Internal high sensitivity geophone or optional external connector
  • 24 bit Sigma Delta
  • Industrialized micro SD data storage – 8 – 64 GB”

Specifications

Seismic Data Channel

1C

ADC Resolution

24 bit Sigma Delta

Sample Interval

0.25ms, 0.5ms, 1ms, 2ms, 4ms

Preamplifier Gain

Programmable 0dB to 42dB in 6dB steps

Antialias Filter
  • 206.5Hz @2ms, 413 Hz @1ms
  • Linear phase or minimum phase
Low Cut Filter

None

Operating Temperature Range

-40C to +75C

Operational Autonomy
  • 560 Hours
  • 12 Hours per day: 46 days
  • 24 Hours per day: 23 days
Weight

.600 kg

Dimensions
  • Max 53.5 mm tube, 209 mm long
  • Max 2.1″ tube, 8.23″ long
Battery
  • 13.4Ah Li-Ion
  • Charge Temperature Range: 0°C ~ +45°C
  • Cycle Life:>500 cycles to 80%
Acquisition Channel
  • @2ms sample interval, 25°C, 31.25 Hz
  • Maximum input signal: 1768 mVrms @0dB
  • Total Harmonic Distortion: 0.0001% @31.25Hz
  • Instantaneous Dynamic Range: 127dB @2ms
  • System Dynamic Range: 148dB
  • Equivalent Input Noise:
    • 1500 nV @0dB
    • 400 nV @12dB
    • 160 nV @24dB
  • Gain Accuracy: 0.25% unit to unit
  • Input Impedance: 100k Ohm
  • Timing Accuracy: +/- 12.5µsec customizable at client request
Instrument Test

Internal Noise, Total Harmonic Distortion, Impulse Response

Sensor Test

Resistance, Impedance, Noise

Sensor
  • Internal, Single Geophone
    • 5Hz or 10 Hz +/- 3.5%
    • 85.8 V/m/s +/- 3.5%
  • Other geophones available upon request
Memory

8 GB standard (expandable to 16, 32, or 64 GB)

All specifications subject to change without notice.

Brochure

Download Brochure: NRU1CSpec.pdf