Raymarine ST60 Dokumentacja Pobierz pdf (Strona 43)

Chapter 4: Calibration 31

Intermediate calibration enables you to:

• Check the instrument software version.

• Check the instrument status - either MASTER (transducer connected) or

REPEATER (no transducer).

• Carry out a calibration run over a measured distance to ensure accurate speed

readings.

To start Intermediate calibration, hold down the

speed and trip keys for

approximately 4 seconds (see

Intermediate calibration

flow chart).

Speed calibration

The speed calibration procedure involves carrying out two runs over a measured

distance, to enable a calibration factor to be determined and applied to your ST60

Speed instrument, to ensure optimum accuracy. Each calibration run comprises

outward and return legs, to minimise the affect of tidal drift when the calibration

factor is determined.

To carry out a speed calibration, start the Intermediate calibration procedure and

use the

speed key to proceed to the Calibration run length screen (see

sheet 1

the

Speed calibration

flow chart). Proceed with the speed calibration as follows:

1. With the Calibration Run Length screen displayed, press the

timer and reset

keys together to enter adjust mode. In this mode, the displayed run length

flashes on and off.

2. Set the length of the intended calibration run, using either the

timer key to

decrement or the

reset key to increment the run length value. You can set any

value between 0.25 and 2.50.

3. Press

timer and reset keys together to commence the speed calibration. The

Cal status screen is displayed. The text at the top of the screen alternates

between START 1 and the calibration factor currently applied.

4. Start the outward leg of the calibration run and as you pass the start point,

press the

trip key, so the screen shows OUTWARD at the top. As the calibra-

tion run proceeds, the displayed value will increment.

5. At the end of the outward leg, press the

trip key again so that:

• The text RETURN is flashing at the top of the screen.

• The displayed distance freezes. Note that this value will not be the same

as the measured distance due to errors introduced by tidal flow.

6. Turn the vessel round, start the return leg and as you do so, press the

trip key

so RETURN stops flashing and the displayed value increments.

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