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Humbars = Interference
Many CCTV installers have seen the classic symptoms of the rolling humbar or the tearing picture but don’t always know the cause of the problem and the solutions to cure it. Humbars or groundloops occur when there is more than one “ground” or “earth” between two pieces of equipment. Loops form and the result is interference on CCTV images such as a rolling grey bar.
Although using a good quality power supply should help prevent this from happening, in complicated systems where a range of equipment is used it is not always easy to eradicate.