Page 133 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

C.1.2.2 Broad-band radiation from EPAC
C.1.2.2.1 General
The electromagnetic radiation generated by the EPAC type submitted for testing

shall be measured by the method described in C.2.
EPAC are considered to be of one EPAC type if they are equal with respect to the
following criteria:

— general layout of the electronic and/or electrical components;
— overall size, layout and shape of the engine mounting and the disposition of
the high-voltage wiring(where present);
— raw material from which both the EPAC chassis and bodywork are
constructed (e.g. a chassis or body made of glass fibre, aluminium or steel).

C.1.2.2.2 EPAC reference limits (broad-band)
C.1.2.2.2.1 If measurements are taken using the method described in C.2, in

respect of a EPAC antenna distance of (10,0 ± 0,2) m, the radiation reference
limit will be 34 dB μV/m in the 30 MHz -75 MHz frequency band and 34-45 dB
μV/m in the 75 MHz to 400 MHz frequency band. This limit will increase by the
frequency logarithm for frequencies above 75 MHz. In the 400 MHz -1 000 MHz

frequency band the limit remains constant at 45 dB.
C.1.2.2.2.2 If measurements are taken using the method described in C.2, in respect

of a EPAC -antenna distance of (3,0 ± 0,05) m, 10 dB shall be added to the limit.
C.1.2.2.2.3 The measured values expressed in dB (micro volts/m) shall be 2 dB below
the reference limit for the EPAC submitted for testing.

C.1.2.3 Requirements relating to narrow-band radiation emissions from EPAC

C.1.2.3.1 General
The electromagnetic radiation from the EPAC submitted for testing is to be measured

by the method described in C.3.
C.1.2.3.2 EPAC reference limits for EPAC narrow-band radiation

C.1.2.3.2.1 If measurements are taken using the method described in C.3, in respect
of a EPAC antenna distance of (10,0 ± 0,2) m, the radiation reference limit will be 24
dB in the 30-75 MHz frequency band and 24-35 dB in the 75-400 MHz frequency

band. This limit will increase by the frequency logarithm for frequencies above 75
MHz. In the 400-1 000 MHz frequency band the limit remains constant at 35 dB.

C.1.2.3.2.2 If measurements are taken using the method described in C.3, in respect
of a EPAC antenna distance of (3,0 ± 0,05) m, 10 dB shall be added to the limit.

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