User's Manual

FIELD EQUIPMENT
NUSEIS
Geophysical Technology Inc Field Equipment Page | 11
NRU-1C N Series Specifications
2
Max charging temperature is protected by firmware, but care should be taken to only charge NRU that have
cooled below 45°C.
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
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 Range
Temp.
-40°C to +60°C
Altitude
4572 m
Humidity
0-100%
Immersion
IP68
Environment
Indoor, outdoor,
arid, swamp,
marsh, wetland,
etc…
Weight
0.693 kg, 1.53 lbs.
Dimensions
Max 53.5 mm tube
209 mm long
Max 2.1” tube
8.23” long
Battery
Type: 13.4ah Li-Ion
Charging Time: ~8 hours
Charging Temperature Range: 0°C to
45°C
2
Cycle Life: >500 cycles to 80%
Battery
Longevity
~ 495 Hours @2msec
12 hours/day: ~ 42 days
24 hours/day: ~ 21 days
Communication
Bluetooth (BLE low power) and USB
Overvoltage
Category
Device: Category I
Pollution Degree
2