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Chapter 4: Calibration 23
Chapter 4: Calibration
4.1 Introduction
Before using the Rudder Angle Indicator instrument for navigational purposes, it
must be aligned with the Rudder Reference Transducer to counter any offset and
ensure that the rudder position is accurately monitored.
EMC conformance
• Always check the installation before going to sea to make sure that it is not
affected by radio transmissions, engine starting etc.
• In some installations, it may not be possible to prevent the equipment from
being affected by external influences. Although this will not damage the
equipment, it can lead to spurious resetting action, or momentarily may result
in faulty operation.
4.2 Rudder angle offset adjustment
Rudder angle offset adjustment removes any deviation between the reading on
the ST60 Rudder Angle Indicator display and the Rudder Reference Transducer. To
adjust for any offset, proceed as follows:
1. Center the rudder and check that the display analog pointer is within ±7° of
zero. If the analog pointer reading exceeds the limits ±7°, the Rudder Refer-
ence Transducer should be realigned in order to avoid scale inaccuracies, see
Chapter 3, Installation
.
2. With the rudder centered, press and hold the
set key for 2 seconds. The instru-
ment will emit an audible beep to indicate that you are in calibration mode.
Note:
You can enter calibration mode only when the instrument is in master mode. If the
instrument is in repeater mode and you attempt to enter calibration mode, the instrument
will beep twice when the
set
key is released, to indicate an invalid key press.
3. Use the < (decrement) and/or > (increment) keys to adjust the Rudder Angle
Indicator display pointer to the zero position in 1° steps, or press and hold
either
< or > for rapid change.
4. Press the
set key for 2 seconds to save the new setting and exit calibration
mode.
Note:
If, during calibration, no key is pressed for a period of 60 seconds, calibration mode
is exited without change.