CCTV Video surveillance ground loops brief explanation | SC0076

Call 214–931–2626 for the EXPERTS in access control, audio/video, automatic gate, video surveillance and low-voltage project management.

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We saw this television that appeared to have a difference in potential from where the signal was being generated. We wanted to mention a couple of points but this is in no means a technical explanation or a definitive guide to diagnosing and/or resolving video surveillance interference.

Interference comes in many different forms. The "ground loop" is a common type of interference. In the video surveillance world it is typically went to devices are connected together and their ground potential differs causing a voltage to be induced on the signal.

There are a couple ways to determine that the easiest being lifting the ground on one of the devices. If the bars go away it's good likelihood it's a ground issue. If they don't go away it's still possible a ground issue just on another device in the circuit. Keep in mind most DVR's will share a common point across all the inputs.

The most common way to resolve the issue if it cannot be fixed by isolating one of the devices is through a ground isolating transformer.

Call us if you have any video surveillance issues we would be more than happy to work with you.



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Please call the commercial and residential EXPERTS in the Dallas-Fort Worth area before you make any decisions about your access control. Call/text 214–931–2626 or email [email protected].

Thank you for watching

Brooks "The Access Control Expert"

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Safeguard Controls, LLC
3100 Commerce 126
Dallas, TX 75226
[email protected]
214–931–2626

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