Astra A5040 Manuel de l'utilisateur - Page 6

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1.5

Power supply

The compass is compatible with any DC power supply of between 8 and 30 Vdc. Typical supply current

during operation is approx. 25mA. The compass is protected against reversed polarity.

Note that the operation of the LED adds another 10mA and that during auto-calibration the

consumption can be as high as 60mA.

Care should be taken to make sure the compass is not situated too close to the power supply, as it's

accuracy may be affected by either the iron in the mains transformer, or by magnetic field 'noise'

from a switching power supply. It is not possible to cover all possible scenarios here, and it

remains up to the user to determine the suitability of a possible location for the compass.

Note that the output from the A5040 takes several seconds to stabilize after a power is applied; the time

taken depends on the damping settings. There is a command - see section 5 – which can be

used to suppress the output after power-up.

1.6

The compass is fixed to the chassis of the vessel or vehicle in the upright position using the fixing holes

shown in the data sheet. It does not matter which way it faces as the azimuth can be set to North

at any time the chassis is orientated North. Alternatively if the azimuth of the chassis is known,

then the A5040 may be rotated before fixing to North using a protractor. S2 is then pressed and

then the compass can be mounted on the chassis.