Sharp QT-80W Instruction Manual download pdf (Page 65)

Solving this problem with an appropriate housing design and/or type of

installation for the luminaire (forced cooling, increased convection effect)

has a further advantage in reducing the interference noise level and should

therefore seriously considered.

Experiments have shown that the amount of noise generated is closely

linked to the operating temperature of the electronic control gear. This is a

particularly important factor if the unit has been installed in accordance with

the recommendations given above. In extreme cases, it will not be possible

to work without additional heat sink.

In addition, the noise level increases disproportionately as the temperature

of the ECG rises. It is therefore best to operate the control gear at a

temperature below the maximum recommended value. In practice, this

means that the amount of noise generated is less, the lower the measuring

point temperature tc. A combination of acoustic insulation of the ECG and

reduced operating temperature represents the best technical solution.

In general, the following applies:

Electronic control gear for T5/∅ 16 mm-fluorescent lamps FH

...HE and

...HO are so quiet that even in very quiet surroundings they cannot be

discerned by the human ear. They are therefore ideal for sound-sensitive

areas such as radio studios with CD quality recordings. If necessary,

random samples should be used to determine whether, given the local

parameters (volume of the studio, reverberation time and number of

ECGs), insulation as described above is needed from an acoustic point of

view or whether standard products could be used.

6.3 Treatment Rooms,

Operating Rooms

In rooms used for medical treatment electrodes may be placed on a

patient’s body to obtain electro-cardiogram or electro-encephalogram

recordings. To eliminate interference from magnetic fields, DIN VDE 0107

defines the maximum recommended inductance strengths. Luminaires

fitted with QUICKTRONIC

control gear easily fall within this limit values at

distances of 0.75 m and greater.

Because of their magnetic field strengths, conventional control gear that

cannot be used for T5/

∅ 16 mm-fluorescent lamps but for T8/∅ 26 mm

tubes are often not suitable and have to be placed at least 3 m away.

6.3.1 Electromagnetic

Interference

Fluorescent lamps are not point light sources and cannot be adequately

focused, which means they are not considered suitable to light operating

tables. Dichroic halogen lamps are used almost exclusively. But even the

room lighting has to meet very stringent requirements in terms of radiated

magnetic fields. Sensitive patient monitoring systems in the operating room

and intensive care wards must not be exposed to leakage magnetic fields.

It is necessary to comply with the maximum recommended interference

levels and minimum installation distances for luminaires as defined in VDE

0107/6.81. Important information on this subject can be found in

Section

3.2

, electromagnetic compatibility.

Whereas conventional control gear had to be installed separately from the

luminaire in a central switch cabinet far enough away from the treatment

area, ECGs for T5/

∅ 16 mm fluorescent lamps can, in most cases, be

installed directly in the luminaire without any problem. The actual

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