ISO 25862:2019/Amd 1:2024

International
Standard
ISO 25862
Second edition
Ships and marine technology —
2019-07
Marine magnetic compasses,
binnacles and azimuth reading
AMENDMENT 1
devices
2024-03
AMENDMENT 1
Navires et structures maritimes — Compas magnétiques marins,
habitacles et alidades
AMENDEMENT 1
Reference number
ISO 25862:2019/Amd.1:2024(en) © ISO 2024

ISO 25862:2019/Amd.1:2024(en)
© ISO 2024
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Published in Switzerland
ii
ISO 25862:2019/Amd.1:2024(en)
Foreword
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This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee
SC 6, Navigation and ship operations.
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iii
ISO 25862:2019/Amd.1:2024(en)
Ships and marine technology — Marine magnetic compasses,
binnacles and azimuth reading devices
AMENDMENT 1
Normative references
Add the following document as a normative reference:
IEC 61000-4-8:2009, Electromagnetic compatibility (EMC) - Part 4-8: Testing and measurement techniques -
Power frequency magnetic field immunity test

Annex F
Add the following sentence at the end of the annex:
See Annex I for practical specifications and requirements of compass safe distance measurements.

Annex I
Add the following annex after Annex H, before the Bibliography:

ISO 25862:2019/Amd.1:2024(en)
Annex I
(informative)
Compass safe distance measurement
I.1 General
This Annex gives practical specifications and requirements on implementing compass safe distance
measurements as determined in Annex F. It covers general test conditions, test equipment and test
procedures for typical test layouts, in accordance with the requirements in Annex F.
I.2 Test conditions
a) Ambient conditions:
The temperature and relative humidity shall be in accordance with the ambient conditions specified in
IEC 60945:2002, 5.2.1.
b) Power supply:
Power supply tolerances shall be in accordance with IEC 60945:2002, 5.2.1.
c) Electromagnetic conditions:
The magnetic environment of the test site shall be independent of any ferromagnetic or electromagnetic
influences that can disturb the measurement, the test equipment, the EUT or the earth’s magnetic field.
NOTE To achieve this, methods can be taken, such as the use of a homogeneous stabilizing artificial magnetic
field to minimize negative effects on the measurement caused by the environment.
I.3 Test equipment
Unless otherwise specified, the following applies:
a) magnetic field generator and Helmholtz coils for magnetization [see Annex F b)] shall conform to
IEC 61000-4-8:2009, 6.2 and 6.3;
b) equipment used in the test shall not cause additional electromagnetic interference.
I.4 Test methods
I.4.1 General requirements
a) Mounting kits, stands and other options, accessories and fittings which are normally used and provided
with the EUT shall be fitted to the EUT during the measurement. If not, each unit of the EUT should be
tested.
As it is unclear how cables, hat rails or other relevant parts are installed in ships, it is possible that these
parts are not included in the measurement, even though they should be clearly considered as not a part
of the vessel or as a part of the EUT.

ISO 25862:2019/Amd.1:2024(en)
b) The EUT shall be tested in the position, attitude and the load condition at which the error produced at
the measurement sensor is a maximum, i.e. the EUT’s strongest pole.
To find out this strongest pole, the EUT shall be rotated. If the EUT has a fixed mounting direction
on the vessel, keep this direction unchanged and rotating from other aspects. Other adjustment can
be required to peak any magnetic disturbance on the measurement sensor if the EUT has alternate
mounting positions.
The EUT’s relative height to the measurement sensor shall be adjusted. If no characteristic pole of the
EUT is detected, half of the height of the EUT shall be placed at the same height as the sensor.
If there are variants of the EUT, the strongest pole shall be chosen by the laboratory with the help of the
manufacturer for the measurement. The other variants may then be fitted with the same compass safe
distances as the strongest pole.
c) The requirements for magnetization are in accordance with IEC 61000-4-8:2009, 8.3 a) and b).
The steps of the magnetization procedure are as follows:
1) Place the EUT in the centre of the Helmholtz coils, oriented with its strongest pole direction in line
with the axis of the coils.
2) Increase the DC power up to the required values.
3) Increase the AC power to the required value.
4) Decrease the AC power slowly to zero.
5) Reduce the DC power slowly to zero.
6) Move the EUT to the plac
...