Item

Specification

Housing/Platform

Uses existing design of BIO-OBS (6 km max water depth).
Weight in air: instrument (82 kg); anchor (55 kg)
Size: 1.1 m high, 1.2 m long, 0.6 m wide

Release

12.5 kHz Acoustic command + timed backup

Duration of recording

23 days @ 2ms sampling on 8 Gb flash card

Sampling rates / dynamic range

up to 5 kHz / 16 bit SAR ADC

Anti-alias filter

software selectable 8th order low-pass digital filter (LTC1164-7)

Gain

Variable settings software selectable:
geophones (0-40 or 53-93 dB); hydrophone (0-40 or 34-74 dB)

Max electrical noise

< 125 nVrms on geophone input
< 1uVrms on hydrophone input

Clock

Seascan precision clock, (4 MHz, drift<1 msec/day)

Data storage

Persistor CF2 data logger with variable length files stored on 8 Gb flash card;
optional use of 2.5" HD up to 80 Gb

Sensors

3-component deployed geophone package (oil filled), deployed on bottom with corrosible link:
4.5 Hz (Mark L-15B or L-28; 380 Ohm coil w/ 0.7 damping)
hydrophone (OAS E-2SD)

External connectors

4-pin (RS-232 comm + time pulse)
3x1-pin (hydrophone+release)

Batteries

D-cell alkaline (analog+digital+data logger+clock)
9-volt alkaline (pinger+acoustic release)
lifetime > 30 days

Data transfer rates to PC

data transfer by USB2.0 flash card or HD reader

Recovery Aids

Strobe + Radio beacon (Novatech ST400A, RF700A-1)
12.5 kHz pinger (ITC 3013 transducer)