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No. 2D730-148E*O
17.2
Magnetic Field Distortion Check Tool
(1)
Outline
The magnetic field distortion check tool is used to confirm that the magnetic field generated
by the transmitter of the position sensor is not affected by the magnetic field environment
in
which the Aplio is installed. This check should be performed
in the following cases.
l
By the service personnel during the installation of the Aplio system
l
By the user after the system installation environment
is changed.
l
By the service personnel during maintenance
work.
l
By the user as a part of daily checks.
(2)
Functions
Since the operating principle of the 3D position sensor is based on the magnetic field as
described in subsection 17.1, the magnetic field distortion in the area in which data
acquisition is performed must be below the specified level. The magnetic field distortion
check tool is designed to check whether the magnetic field distortion in the possible
acquisition range is acceptable or unacceptable.
(3)
Procedure
Place the position sensor receiver at each of positions A, B, and C that are located on a
straight line at regular intervals. At each position, the receiver must be placed in the same
orientation.
Based on the positional and directional information at each check position, the
magnetic field distortion check tool obtains the following three parameters:
1) direction at
each position, 2) vector(p)
between A and B, and 3) vector(q)
between B and C. If the
magnetic field is not distorted, these three parameters should be equal.
Based on this rule,
the check tool analyzes any errors in the actual magnetic field environment
as compared
with the ideal and determines whether or not the level of magnetic field distortion is
acceptable.
transmitter
Figure 17-7 Principle of magnetic field distortion check
17-5
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