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 VDU jitter

Video Display Units jitter

Elimination of VDU jitter includes the following operations:

  • detection of magnetic field source causing VDU jitter;
  • elimination of the malfunctions, which cause high levels of magnetic fields.

The diagnostics of building power supply system can be necessary to identify the leakage currents and grounding wires mistakes. After detection and elimination of malfunctions, building power supply system would satisfy the requirements of Russian National Electrical Rules (edition 7).

Screen image spatial instability (VDU jitter) is the important visual interface parameter of PC video display unit with cathode-ray tube (CRT); it is regulated according to section 8.1 of Sanitary and Epidemiological Rules and Standards (SanPiN 2.2.2/2.4.1340-03; "Hygienic requirements to personal computers and organization of their operation"). This effect occurs, when the magnetic component of external 50 Hz power frequency electromagnetic field and magnetic induction power flux density, B, of >= 1000-2500 nT affects the VDU beam control system.

Electromagnetic field sources such as power cables, distribution elements of electric power supply system, AC currents on heating pipes and radiators, water pipes and metal elements of the building design able to cause screen image spatial instability.

Please, request more information from Electric Engineering Department of Center for Electromagnetic Safety.

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