Introduction - NorthStar NS 3100 User Manual

1 Introduction

Units
The factory default units
are meters. To change
these units, please refer to
section 3-1 of this manual.
4
The NS3100 DEPTH measures and displays the depth
of the water. An installed NS3100 DEPTH usually has
two parts:
The display unit.
A depth transducer, which is attached to the hull
and wired to the display unit.
The unit is powered from the boat's power supply.
The NS3100 DEPTH is part of the Northstar family
of instruments for boats, which includes instruments
for speed, depth and multi. These instruments can
be connected together to form an integrated data
system for a boat (see section 4).
For maximum benefit, please read this manual
carefully before installation and use.
The NS3100 DEPTH display unit
Display (backlit)
Four keys
(backlit)
How the transducer measures depth
The depth transducer generates an ultrasonic (sound)
pulse, which travels down through the water. When
the pulse meets the bottom, some of the pulse is
reflected back up towards the boat and is received by
the transducer.
The display unit analyses the reflections from each
pulse. It removes unwanted reflections (from bubbles
and other objects) and calculates the depth by
measuring the time between sending the pulse and
receiving its echo.
Cleaning and maintenance
Clean the display unit and any plastic transducers
with a damp cloth or mild detergent. Avoid abrasive
cleaners, petrol or other solvents.
When repainting the hull, cover or remove any visible
transducers. Depth transducers may be coated with
a thin layer of antifouling paint; gently sand off any
previous paint first.
Alarm symbol
Display normally
shows depth
Depth units
Northstar NS3100 DEPTH