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 (available 3C in Q3 2019)

ADC Resolution

24 bit Sigma Delta

Sample Interval

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

.690 kg, 1.5 lbs

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: 2121 mVrms @0dB
  • Total Harmonic Distortion: 0.0001% @31.25Hz
  • Instantaneous Dynamic Range: 127dB @2ms
  • System Dynamic Range: 140dB
  • Equivalent Input Noise:
    • 1500 nV @0dB
    • 400 nV @12dB
    • 160 nV @24dB
  • Gain Accuracy: 0.25% unit to unit
  • Input Impedance: 20k 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: NRU-1C-Brochure_NewNode.pdf