Page 141 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

g) In order to take account of differences in EPAC geometry, a number of reference
points shall be established for the relevant test installation.

C.4.7.2 Field strength contour
During the calibration phase (before the EPAC is positioned on the test surface) the

field strength shall not be less than 50 % of the nominal field strength at the
following locations:
a) for all field-generating devices, (1,0 ± 0,02) m on either side of the reference

point on a line passing through this point, and perpendicular to the median
longitudinal plane of the EPAC;

b) in the case of a TLS, (1,5 ± 0,02) m on a line passing through the reference point,
and situated in the median longitudinal plane of the EPAC.
C.4.7.3 Characteristics of the test signal to be generated

C.4.7.3.1 Peak value of the modulated test field strength

The peak value of the modulated test field strength shall correspond to that of the
unmodulated test field strength, the actual value in volts/m of which is defined in
C.1.2.4.2.

C.4.7.3.2 Test signal waveform
The test signal shall be a radio-frequency sinusoidal wave, amplitude-modulated by

a sinusoidal 1 kHz wave at a modulation rate m of 0,8 ± 0,04 (peak value).
C.4.7.3.3 Modulation rate

The modulation rate m is defined as follows:

m ≥ NUM > peak envelope value -minimum envelope value > DEN > peak envelope
value + minimum envelope value The envelope describes the curve formed by the
edges of the modulated carrier as seen on an oscillograph.

C.4.8 Inspection and monitoring equipment
For the purposes of monitoring the external part of the EPAC and the passenger

compartment and of determining whether the conditions laid down in C.4.6.2.2
have been met, use will be made of a video camera or cameras.
C.5 Method of measuring broad-band electromagnetic radiation from separate

technical units (ESA)
C.5.1 General

C.5.1.1 Measuring equipment
A broad peak detector shall be used to measure broad-band electromagnetic

emissions.
NOTE The measuring equipment is described in EN 55012.

第 133 頁共 162 頁