Controller; Cables And Video Switchers; Isolation Between Video Ground And Protective Earth; Electrical Interferences - Siemens SCD 1815-E Operating Instruction

3.7.2.

Controller

There are several development generations and versions for each controller (e.g.WF470):
For example, the video unit has different designs.
There are controllers with a fixed output level, as well as ones with an output level controlled using
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potentiometers or plug-in jumpers (0.7 V; 1 V; 1.4 V).
The programmed video timings may also differ depending on the application.
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You can obtain detailed information from the hotline responsible for the respective controller.
3.7.3.

Cables and video switchers

Systems sometimes have an extremely complex design.
Long video cables and various "black boxes" may be connected between the computer and
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monitor. The video signal can then no longer satisfy the requirements for a good picture quality
Measure the video signal at the monitor input using an oscilloscope
3.7.4.

Isolation between video ground and protective earth

Systems designed according to this principle can only be correctly operated using the SCD 1815-I 18"
LCD desktop monitor (6GF6220-1MV).
All other 15-kHz products do not have isolation between the video ground and protective earth!
Select correct monitor, make correct ground connections.
3.7.5.

Electrical interferences

The interference susceptibility of digital and analog monitors differs. The systems were previously
defined for the analog technology of the monitors, and no LCD monitors existed then. It is necessary
to avoid possible interferences on the video signals:
- Check the ground connections
- Avoid earth loops
- Consult system experts.
LCD-Monitor SCD 1815-E page 42 / 52
Operating Instruction
DOC-Nr.: B30055DE6.doc