Seismic Data Channels
4
ADC Resolution
24 bits
Sample Interval
0.5, 1, 2, 4 milliseconds
Preamplifier Gain
0 dB to 36 dB in 6 dB steps
Anti-Alias Filter
206.5 Hz (82.6% of Nyquist) @ 2ms, Linear Phase
DC Blocking Filter
1 Hz to 60 Hz, 6 dB/Octave, or OUT
Operating Temperature Range
-10˚C to +60˚C
Operating Life
100 days of 2msec acquisition
Acquisition Channel
(2ms sample interval, 25°C, 31.25Hz, internal test, unless otherwise indicated.)
Total Harmonic Distortion
0.0003% @ 12 dB gain, -3dB Full Scale
Equivalent Input Noise
1.0μVrms @ 0dB
0.4μVrms @ 12dB
0.3μVrms @ 24dB
0.3μVrms @ 36dB
Full Scale Input Signal
2500mV peak @ 0 dB
625mV peak @ 12 dB
156mV peak @ 24 dB
39mV peak @ 36 db
Gain Accuracy
0.50%*
Dynamic Range
120dB @ 0 dB Preamplifier Gain
Crossfeed
<-100 dB Geophone Channels
<-80 dB Hydrophone Channel**
Common Mode Rejection Ratio
>+90 dB Geophone Channels
>+40 dB Hydrophone Channel**
DC Offset
<10% of Input Noise with DC Blocking Filter IN
Timing Accuracy
< ±1 ms – corrected post-acquisition
Self Test Features
Internal Noise (preamp input terminated) Internal THD
Internal Gain Accuracy
Internal CMRR
Internal Crossfeed
Internal Impulse
Sensor Impedance
TBD
Sensors
Geophone
3 orthogonal, omni directional 15 Hz @ -3 dB, 70% damped
1.76 V/in/s (69.3 V/m/s)
Hydrophone
3 Hz @ -3 dB, 8.8 V/Bar
Orientation
±1.5° tilt indication
±5° azimuth (at Latitudes within ± 50° of the Equator)
Pressure
TBD
Physical
Weight
48 lb (21.8 kg) in air, 24 lb (10.9 kg) in water
Dimensions
15.1 in. diameter by 5.9 in. high
Operating Depth
4000 meters
* Does not include high-impedance low-cut filter for directly coupled hydrophone interface
** Channel includes high-impedance low-cut filter for directly coupled hydrophone interface
All specifications relate to Remote Unit Part Number 221.8600.0001 only.
FairfieldNodal reserves the right to change specifications without notice to provide the best possible product.
Drawing Number 601.6021.0001 Rev.