Seismic Data Channels

4

ADC Resolution

24 bits

Sample Interval

 0.5, 1, 2, 4 ms

Preamplifier Gain

 0 dB to 36 dB in 6 dB steps

Anti-Alias Filter

 206.5 Hz (82.6% of Nyquist) @ 2 ms, 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

 300 days of 2 ms acquisition over 5 year installation

Acquisition Channel

 (2 ms sample interval, 25°C, 31.25 Hz, internal test, unless otherwise indicated)

Total Harmonic Distortion 
0.0003% @ 12 dB gain, -3 dB Full Scale

Equivalent Input Noise 
1.0μVrms @ 0 dB
0.4μVrms @ 12 dB
0.3μVrms @ 24 dB
0.3μVrms @ 36 dB

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 
120 dB @ 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, 8.9 V/Bar

Orientation 
±1.5° tilt indication
±5° azimuth (at Latitudes within ± 50° of the Equator)

Pressure
TBD

Physical

Weight 
170 lb (77 kg) in air, 85 lb (39 kg) in water

Dimensions 
19.9 in. diameter by 10 in. high

Operating Depth 
4000 m

 * 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 221.8800.0001 only. 
FairfieldNodal reserves the right to change specifications without notice to provide the best possible product. 
Drawing Number 601.6020.0001 Rev.


August 2016

Click here to download a PDF of the ZLoF specs.