Specifications

Appendix A-2 EQ33 Glossary of terms
ing the gain setting of the EQ33 will allow you to see smaller and deeper
targets. If the gain is set too high, however, you will begin to see “noise” and
unwanted targets. Generally speaking, you want to set the gain control just
below the point that you begin to see speckles of “noise” between surface and
the bottom on the screen.
LOG speed calibration – the unit is preset to receive 19000 pulses per nauti-
cal mile from the log transducer (paddle wheel). However the figure might
have to be changed to compensate for various transducers and actual water
flow passing the transducer. The correct pulse rate is calculated by:
19000 x indicated speed (e.g. 4kn)
= 15.200 pulses/nm
actual speed (GPS) (e.g. 5kn)
Measurement units – the user may select the displayed units to be one of the
following:
m meters
ft feet
fm fathoms
nm nautical mile, 1 nm is 1,852 meters
kn knots, nautical mile per hour
km kilometer, 1 km is 1,000 meters
kh kilometer per hour
mi statute mile, 1 mile is 1,609 meters
mh mile per hour
MENU – the selection of main menus will be shown in the upper part of the
screen. Leaf through the menus by means of the cursor key and the [ENT]
key, or use the numerical keys to activate one of the menus.
NMEA – National Marine Electronics Association. The NMEA is an organi-
zation of manufacturers of marine electronics equipment. They have adopted
the NMEA0183 as a standard for communications between various types of
marine electronic equipment.
Ping to ping filter – can be set to either on or off. With the filter “off”, then
each received echo will be reflected on the screen. Whereas with the filter
“ON”, the system will compare every two echoes received and only reflect on
the screen what is received from both echoes, which will give a more unclut-
tered and precise recording.
Pulse length – the transmitted pulse length can be set to OFF for observing
noise in the water (Auto range will switch to manual mode). Set to AUTO, the
optimum setting will be applied according to the water depth. Or it can be set
manually, if a specific pulse length is required - see next page: