Product Description

The NRU™ is a self-contained seismic nodal recording unit with a 58 gram internal eCab (electronic cab) that can be quickly removed and inserted into a dozen different interchangeable NuSeis formfactors, each optimally suited for particular environments to provide peak operating performance, and the highest quality ground coupling. The unit has a strong and durable two-piece, water proof Lexan externally assembly with locking rings that enclose the internal battery and geophone. All the NuSeis transformer formfactors have the same upper Lexan dome with four stainless steel MIM protrusions for data download and power recharge.

Product Features

  • All in one device – geophone, electronics and battery
  • Formfactor options for all environments
  • GNSS/GPS including GPS, GLONASS, GALILEO, BEIDOU
  • Raw GNSS data recording enables DGPS post processing of node location
  • High Speed USB data download
  • EarthGrip ground coupling providing superior data quality
  • Highly visible LED status indicators
  • 10 Ah Li-ion battery <100mW power consumption
  • Bluetooth 5.1™ continuous broadcast of 20 Health&Status metrics
  • High sensitivity geophone (5 Hz, 10 Hz or any other customer choice)
  • Optional KCK connector lower end housing – enables external geophone/hydrophone
  • System Dynamic Range: 148dB
  • 8 GB standard (expandable to 16, 32, or 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
  • NRU Lite 18 days (12 Hours per day)
  • NRU KCK 46 days (12 Hours per day)
  • NRU 1C 46 days (12 Hours per day)
  • NRU Flighted 48 days (12 Hours per day)
  • NRU D3 92 days (12 Hours per day)
  • NRU EL 92 days (12 Hours per day)
  • NRU UFO 80 days @ -30C (12 Hours per day)
  • NRU SL BASE 48 days (12 Hours per day)
Weight
  • NRU Lite 400 gr
  • NRU KCK 530 gr
  • NRU 1C 600 gr
  • NRU Flighted 620 gr
  • NRU D3 860 gr
  • NRU EL 860 gr
  • NRU UFO 1600 gr
  • NRU SL BASE 1800 gr
Dimensions
  • NRU Lite – Max 45 mm tube, 199 mm long
  • NRU KCK – Max 53.5 mm tube, 209 mm long
  • NRU 1C – Max 53.5 mm tube, 209 mm long
  • NRU Flighted – Max 58 mm tube, 209 mm long
  • NRU D3 
  • NRU EL  Max 53.5 mm tube, 218 mm long
  • NRU UFO 
  • NRU SL BASE
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: GTI_NUSEIS_NRU_1C_Spec.pdf