Ecler DVA SERIES - Manual (Page 6)

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3.5. Settings
These controls let you individually adjust the video (3), chrominance (4) and audio (1-2)
levels. These settings should only be modified by a qualified technician, with the appropriate
measuring instruments.
4. CONSIDERATIONS
4.1. Ground loops
Ensure at all times that no signal sources reaching the device and no devices connected to
its inputs have their earths interconnected; that is, earth should never reach them via two or more
different paths, as this could lead to humming which could even interfere with the video reproduction
quality. In order to avoid earth loops, ensure that the shieldings of cables, if connected to the
chassis, are never connected with each other.
4.2. Background noise
The use of active circuitry can yield, depending on the configuration, to a significant noise
level. The DVA1-5c and DVA2-10c distribution amplifiers have been designed for the minimum
possible noise. Anyway, the noise level will always depend on the correct use and installation of the
unit.
4.3. Cleaning
The front panel should not be cleaned with dissolvent or abrasive substances because
silk-printing could be damaged. To clean it, use a soft cloth slightly wet with water and neutral liquid
soap; dry it with a clean cloth. Be careful that water never gets into the amplifier through the holes of
the front panel.