NAUTA scientific

sensing the real world

Cetacean Research Technology C57 and C57X

The Cetacean Research C57 and C57X models are preamplified, cylindrical hydrophones designed for the detection of infrasonic, audible, and ultrasonic sounds.
In addition to typical underwater use, these hydrophones can also be used for the detection of airborne and subterranean sounds and vibrations. 
The C57 hydrophones include an integral connector and are encapsulated in a very rugged polyurethane material. 
The hydrophones are not individually calibrated but calibrated frequency response measurements can be performed on request.
Specifications
Linear Frequency Range (±3dB) [kHz]: 0.015 to 45
Usable Frequency Range (+3/-20dB) [kHz]: 0.008 to 100
Transducer Sensitivity* [dB, re 1V/µPa]: -187
Preamplifier Gain [dB]: 20 / 33 for X model
Effective Sensitivity* [dB, re 1V/µPa]: -167 / -154 for X model
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa]: 46 (Sea State Zero)
Power Requirement [Vdc]: 5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa]: 171 to 188 / 158 to 175
Maximum Operating Depth ** [m]: 370
Operating Temperature Range [ºC]: -40 to 60
Output Impedance []: 2.5
Dimensions [mm]: 119 L x 25 dia.
Integral Connector ***: Subconn MCBH3MSS
Wiring instructions for the C57 series
Battery / Connector box
Battery boxes are rated NEMA-4X water resistant. Standard signal connection for the Cetacean Research C57 hydrophone is through a watertight female BNC connector.
The hydrophones are powered by a single 9V battery (not included).
Signal Output: Female BNC connector
Battery Life [hours]: > 20
Box Dimensions [mm]: 98 long x 64 wide x 40 high
Directionality
• omnidirectional below 10kHz;
• very directional at high frequencies (e.g., ~15º solid angle at 200 kHz, -3dB);
• directionality focused in a plane.
notes

The C57 hydrophone is a direct replacement for the C54XRS and C55 series.

*  Transducer Sensitivity + Preamplifier Gain = Effective Sensitivity.

**  1,000 meter versions are available. Append "-1k" to the model number to order a hydrophone with a depth rating >1,000 meters.

*** Connectors are rated to a depth of 7,000 meters.
Options
• removable in-line high-pass filter
• external power supply support

Shielded Cable Length [m]: mating connector molded to 15, 30, or 50 [m] shielded cable as standard, different lengths available on order.

Cable includes Integral Connector rated to a depth of 7,000 meters.
Hydrophones