Data Acquisition & Telemetry Systems
SEACAL Data Acquisition System

The SEACAL data acquisition system is a deep water, acoustic data collection system designed primarily for bottom-moored, subsurface applications. The system digitizes and records up to 32 hours of acoustic data from as many as 26 externally located hydrophones, storing the data in digital form on standard VHS cassette recorders. The system consists of an electronic chassis, battery pack, mounting frame, flotation package, and pressure proof housing designed for 20,000 ft. submergence. The on-board microprocessor control unit permits continuous or sampled data recording, and also records digital Date/Time and depth data along with the acoustic data. Data tapes recorded by the SEACAL system are played back on a companion playback system.

Additional Features:

  • Individual programmable gains (0-98 dB)
  • 14 bit resolution
  • Wide Dynamic Range (72dB in 1 Hz band)
  • 5-1000 Hz bandwidth (26 channels)
  • Bandwidths as high as 4000 Hz possible (8 channels)

SEACAL Specification Summary

Number of Channels: 26
Frequency Response: 5 Hz to 1 kHz
Channel Gain: 0-48 dB, 50-98 dB, (6 dB Steps)
Chan.-To-Chan. Gain Match: 1 dB
Chan.-To-Chan. Phase Match: 5 Deg
Distortion: <-60 dB
Dynamic Range (1 Hz band): > 72 dB
Crosstalk: <-50 dB
Aliasing Rejection: > 42 dB
Digital bit error rate: 1 in 10,000,000
Total Record Time: 32 Hrs. (T160/SLP) 10.6 Hrs. (T160/SP)
Delayed Start: Preset Day/Hr/Min
ON/OFF Sequencing: ON: 1 to 1920 Minutes OFF: 1 to 99,999 Minutes
Digital Time Code: DAYS:HR:MIN:SEC (BCD) embedded With Acoustic Data
Depth Interface: 4-20 mA Current Loop, Recorded Digitally
Power Supply: 4, 65 A-hr. "Gel-Cell" Batteries
Operating Temp: 0 to 40 Deg. C
Pressure Rating: 10,000 psi

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