OSRAM POWERTRONIC PT-FIT I ECG for HID lamps, with cable clamp - Manual (Page 33)

THE PRODUCT IN OPERATION
2.5.3. Radio interference
Conformity with the specifi ed limits for radio interference
is a precondition for granting of the VDE-EMC mark by
the VDE independent testing institute based in Offenbach,
Germany.
Our electronic control gear (ECGs) are tested in a test set-
up via a reference luminaire, as described in CISPR 30.
ECGs for independent assembly, in contrast, are tested
exclusively according to CISPR 30. The levels of inter-
ference of a luminaire, however, not only depend on the
ECG, but also on a number of factors:
• The arrangement of lamp and ECG components
• The structure of the luminaire
• Wiring
For this reason, conformity to the specifi ed limit for a lumi-
naire considered as a systematic whole is substantially
more complex and must be tested separately for each
luminaire approval (e.g. by the VDE testing institute).
The manufacturer of the luminaire is responsible for this.
2.5.3.1. Causes of radio interference
The term "radio interference" includes both the interference
through the lines as well as the radiated interference from any
electric device on another device on the same power network
and/or in the immediate vicinity.
In order to ensure simultaneous, fault-free operation of the
widest possible variety of electric devices, each of those
devices must conform to particular limits and demonstrate
a certain level of resistance to interference.
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POWERTRONIC ® ECGs are based on a high-frequency
circuit topology to achieve higher energy effi ciency and
compact size. These high-frequency switching processes,
together with non linear components (such as diodes,
transistors, etc.) can create interference with the mains
and lamp cables of the ECG. Both the mains and lamp
cables can function as antennas in this context.
The greater part of the electromagnetic radiation is trans-
ferred onto these cables. Under unfavorable conditions
the lamp cables can form a resonator in combination
with the luminaire, thus leading to increased emission
(λ/4, 100 MHz → l = 75 cm). The resonance cycle is infl u-
enced by the inductivity of the cables, the capacitative
coupling of cables with metallic surfaces of the luminaire
and the lamp being used. Provided that as this resonance
cycle cannot be controlled by structural measures it is
recommended to apply ferrites to the lamp cables.
2.5.3.2. Hints on installation to prevent radio inter ference
Since the cable layout has a decisive infl uence on the radia-
tion characteristics of a luminaire, it is essential to make sure
that cables are positioned carefully inside (and outside) the
luminaire as described in section 2.2.4.4.
With the use of complex internal EMC fi lters the interference
described above is reduced to levels below those required
by the relevant standards, so that the OSRAM electronic
control gear themselves conform to these standards.
However, installing the ECG into luminaires can signifi cantly
change these properties.