Specifications
EQ33 Installation and service Chapter 9-7
9.5.1 Power supply connections
The internal voltage regulator will allow the EQ33 to operate normally within
the power supply voltage range from 10 to 32 V DC. The EQ33 is connected to
external power (battery) by means of the supplied power/NMEA cable. Cable
length is approximately 2 meters.
After connecting the cable to the power source, push the plug as far as it will
go into the nine pin receptacle marked “PWR” on the rear of the cabinet and
turn the plug’s coupling ring clockwise until it makes a click.
9.5.2 Fuse
Warning! A fuse should always be installed to protect the unit.
Using a fuse which is not specified for your equipment can cause it to blow
the instant the EQ33 is switched on or it will not protect the equipment as
intended – see fuse rating in section 9.10 Specifications.
9.5.3 Transducer connection
Most transducers are supplied with a 10 meter cable for connection to the
echosounder unit – EQ33. Push the female plug, as far as it goes, into the
receptacle marked “ECHO” on the rear of the cabinet and turn the plug’s cou-
pling ring clockwise until it clicks into locked position
The EQ33 must be turned off while connecting/disconnecting the trans-
ducer cables.
Recommended transducers
Airmar single element two-frequency 50/200 kHz transducers i.e. B744, P319,
B45, B256, P66 and P52.
9.5.4 NMEA0183 interface connection
NMEA0183 interface connection is made via the combined power and NMEA
cable.
9.6 Basic transducer and cable information
The installation should be carefully planned in advance, keeping in mind the
standard cable length of 10 meters (32 feet) which is connected to the trans-
ducer. In the event where the standard cable is not long enough, up to an addi-
tional 10 meters (32 feet) may be connected without a noticeable reduction of
the performance. The cable must be of the same type as the standard cable.
The EQ33 must be turned off while connecting/disconnecting the trans-
ducer cable.
The use of longer cable runs, while possible, always increases the likelihood of
increased interference and decreased performance. Care must be taken when
increasing the cable lengths to ensure that proper, adequate and consistent