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.

Click here to download a PDF of the ZXPLR specs.