Sharp QT-80W Instruction Manual download pdf (Page 66)

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

, 5

and 7

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

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