Users Manual

FIELD EQUIPMENT
NUSEIS
Geophysical Technology Inc Field Equipment Page | 10
NRU-1C M Series Specifications
1
Max charging temperature is protected by firmware, but care should be taken to only charge NRU that have
cooled below 45°C.
Acquisition Channel
@2ms sample interval,
25°C, 31.25Hz
Maximum input signal:
1768mVrms @0dB
Total Harmonic
Distortion: 0.0001%
@31.25Hz
Instantaneous Dynamic
Range @ 12dB gain:
123dB @ 2ms
121dB @ 1ms
119dB @ 0.5ms
Equivalent Input Noise:
1500nV @ 0dB
400nV @ 12dB
160nV @ 24dB
Gain Accuracy: 0.25% unit
to unit
Input Impedance: 20kohm
Timing Accuracy:
+/- 12.5usec
GPS Time Standard: Better
than 500ppb
Sensor Test
Resistance, Impedance, Noise
Sensor
Internal Single Geophone:
10Hz +/-3.5%
85.8V/m/s +/-3.5%
Other geophones available on
request
Internal Test
Impulse Response, Noise, Total
Harmonic Distortion
Memory
8GB standard (expandable to 16, 32,
or 64GB)
~55 days @ 2ms
~27 days @ 1ms
Seismic Data
Channel
1 Component
ADC Resolution
24-Bit Delta Sigma
Preamplifier
Gain
Programmable 0dB to 42dB in
6dB steps
Anti-alias Filter
206.5Hz @ 2ms, 413Hz @ 1ms
Linear Phase and Minimum
Phase
Operating
Temperature
Range
-40°C to +60°C
Weight
0.862 kg, 1.9 lbs.
Dimensions
Max 50.5mm tube
299 mm long
Max 1.988” tube
11.77” long
Battery
Type: 10ah Li-Ion
Charging Time: ~6 hours from
cutoff to 100%
Charging Temperature Range:
0°C to 45°C
1
Cycle Life: >500 cycles to 80%
Battery
Longevity
~384 Hours @2msec
12 hours/day: ~30 days
24 hours/day: ~16 days
Communication
Bluetooth (BLE low power) and
USB or TransferJet Proximity
GNSS
Ultra-low power, multi-GNSS
with multi-path detection and
compensation
Orbit prediction for fast TTFF
PPS typical accuracy +/-10ns
Sensitivity: Acquisition -
148dBm cold / -163dBM
hot
Tracking: -165dBm