Page 138 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

manufacturer.
C.4.4.2 During the tests on the EPAC, only non-interference-generating equipment

may be used.
C.4.4.3 Under normal conditions, the EPAC shall be facing the antenna.

C.4.5 Type, position and orientation of the field generator
C.4.5.1 Type of field generator

a) The criterion for the selection of the field generator type is the capacity of the
latter to attain the prescribed field strength at the reference point (see C.4.5.4)

and at the appropriate frequencies.
b) Either the antenna(s) or a transmission line system (TLS) may be used as the field
generating device(s).

c) The design and orientation of the field can be generated is polarized both
horizontally and vertically at frequencies between 30 MHz and 2000 MHz.

C.4.5.2 Measurement height and distance
C.4.5.2.1 Height

C.4.5.2.1.1 The phase mid-point of all antennas shall not be less than 1,5 m above
the EPAC plane.

C.4.5.2.1.2 No part of the antenna radiator elements shall be less than 0,25 m from
the EPAC plane.
C.4.5.2.2 Measuring distance

C.4.5.2.2.1 Greater homogeneity of the field may be obtained by placing the field
generator as far as technically possible from the EPAC. This distance will normally be
in the range 1 to 5 m.

C.4.5.2.2.2 If the test is carried out in a closed installation, the radiator elements of
the field generator shall not be less than 0,5 m from any type of radio frequency
absorption material and not less than 1,5 m from the wall of the installation in
question. There shall be no absorption material between the transmitting antenna

and the EPAC under test.
C.4.5.3 Position of the antenna in relation to the EPAC

C.4.5.3.1 Reference point
C.4.5.3.1.1 The field generator shall be positioned in the median longitudinal plane
of the EPAC.

C.4.5.3.1.2 No part of the TLS, except the EPAC plane, may be less than 0,5 m from
any part of the EPAC.

C.4.5.3.1.3 Any field generator placed above the EPAC shall cover at least 75 % of
the length of the EPAC.

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