Page 139 - TBIS_15194-2019_(EN)_3nd
P. 139
TBIS 15194:2019
C.4.5.3.1.4 The reference point is the point at which the field strengths are
established and is defined as follows:
a) horizontally, at least two metres from the antenna phase mid-point or, vertically,
at least one metre from the TLS radiator elements;
b) in the median longitudinal plane of the EPAC;
c) at a height of (1,0 ± 0,05) m above the EPAC plane;
or
-at (1,0 ± 0,2) m behind the vertical centre line of the EPAC's front wheel in the case
of tricycles;
or
-at (0,2 ± 0,2) m behind the vertical centre line of the EPAC's front wheel in the case
of bicycles.
C.4.5.4 Position of the EPAC
If it is chosen to subject the rear part of the EPAC to radiation, the reference point
shall be established as stated in C.4.5.3.1. In this case the EPAC will be positioned
with its front part facing in the opposite direction to the antenna and as if it had
been rotated horizontally through 180 degrees about its central point. The distance
between the antenna and the nearest part of the outer surface of the EPAC shall
remain the same.
C.4.6 Requisite test and condition
C.4.6.1 Range of frequencies, duration of the tests, polarization
The EPAC shall be exposed to electromagnetic radiation in the 20-2000 MHz
frequency range.
a) Measurement shall be made in the 20 MHz to 2000 MHz frequency range with
frequency steps according to ISO 11451-1, with a dwell time of (2 ± 0,2) s for each
frequency.
b) The vertical polarization modes described in C.4.5.1 c) shall be selected by
common agreement between manufacturer and testing body.
c) All other test parameters are as defined in this clause.
C.4.6.2 Tests to check deterioration in direct control
C.4.6.2.1 A EPAC is deemed to fulfil the requisite immunity conditions if, during the
tests carried out in the manner required by this clause, there are no abnormal
changes in the speed of the EPAC's drive wheels, there are no signs of operational
deterioration which might mislead other road users and there are no other
noticeable phenomena which could result in a deterioration in the direct control of
the EPAC.
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