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Sensor test procedures
277
850-165186 / Rev.B
(5) = None to nine short flashes: The number of short
flashes signifies the second digit of the configured
channel number.
3 Using a multimeter, check the DC current between the
negative charging lug (A) and the water detector (B).
- With the i nitial sea water switch and a a fully charged
battery, the current should not exceed 150 µA.
- With a redesigned sea water switch (sacrificial bolt)
and a a fully charged battery, the current should not
exceed 67 µA.
- If you measure 0 µA, check the fuse on your
multimeter.
Testing on land
The sensor can only b e tested in water.
Testing in water
1 Lower the Depth sensor over the side of the vessel to a
measured depth greater than two m eters.
- The sensor will not activate if the depth is less than two
meters.
2 Switch off the vessel’s echo sounders, sonars and other
hydroacoustical equipment to avoid interference.
3 Switch off the PI54’s interference filter, and observe the
numeric display.
- If the interference symbol is not displayed, leave the
interference filter switched off to increase the system’s
range and performance.
4 Use the PI54 Status display to monitor the sensor’s signal
strength.
- If the interference filter is activated, the spectrum
displayed should be relatively flat (approximately 25
dB with interference filter set at level 9) with a peak
detected in the configured channel.
5 Check that the depth read-out on the PI54 corresponds to
the actual measured depth at which the sensor is
suspended.
- If these values vary, calibrate the PI54 depth offset. The
procedure is described below.
6 Hoist and lower the sensor in the water, and observe that
the depth readout changes accordingly.
7 Turn on the vessel’s echo sounders as well as other
hydroacoustical equipment used during normal fishing
operations.
289


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