Instruction manual

65
interference levels generated by luminaries fitted with ECGs are generally
lower than those generated by the connecting cables between the luminaire
and the choke for a conventional separate T8/
∅ 26 mm arrangement.
The electrical safety requirements correspond to those for installations in
humid locations. In other word, protection class II luminaires should be
used. For precise information on the minimum level of protection for the
luminaire see DIN 40050/IEC 529.
Because of their low field strengths ECGs are unlikely to affect electronic
equipment. There has been no known incidence of a heart pacemaker
being affected.
6.3.2 Interference from
Infrared Transmission
Equipment
Fluorescent lamps emit energy in wavelength bands that are also used for
infrared transmission. These emissions cannot be changed at the lamp.
Since IR receivers are often not selective and operate with wide
wavebands, the IR equipment may be triggered inadvertently if light from
the lighting system enters the receiver. The light emitted from the
fluorescent lamp is modulated at twice the operating frequency ( 40 kHz to
120 kHz). Interference may occur if the useful signal also operates in this
frequency range.
Interference is likely in cases in which the useful signal falls in the
frequency range of the light emitted from the fluorescent lamp. Operating at
higher frequencies ( 400 to 1500 kHz) or using optical filters in front of the
infrared receivers (absorption filters) may help. Shielding the infrared
receiver from direct light (with a tube, for example) may also help.
The carried signal for sound transmission used to be around 95 kHz or
higher, which meant that the 3
rd
, 5
th
and 7
th
harmonics of the ECG operating
frequency ranges (30 to 60 kHz in normal operation and up to 120 kHz in
dimmer mode) led to considerable interference in transmission. Headphone
manufacturers shifted to higher frequencies, such as 2,3 MHz and 2,8 MHz,
to remedy the problem.
For simultaneous interpreting systems, which also operate in the 95 to
250 kHz frequency range, we recommend not to use the first six
transmission channels, particularly channel 1, because these are affected
by the harmonics of the basic ECG frequencies.
6.4 Electronic Tagging
Many department stores and shops now use electronic tagging systems to
protect their merchandise (such as clothes, CDs, drugstore articles etc.)
against theft. These systems typically operate with resonance frequencies
in the kHz-range.
In certain circumstances these systems may malfunction if the operating
frequency is between 30 kHz and 130 kHz. It may be possible to eliminate
the problem by increasing the distance between the luminaire and the
transmitter/receiver.
6.5 Emergency Lighting
T5-luminaires with QUICKTRONIC
®
from OSRAM can be operated on
either AC or DC voltage. This means that the same luminaries can be used
for both general lighting and emergency lighting in an easy and cost-
effective way. Especially safety lighting from installations with high
illuminances (i.e. in workplaces with high risks) can be realised