Contents
What do ground loops do?
Ground loops allow electrical and magnetic interference to create noise voltage sources. These voltage sources add to the signal being measured and are indistinguishable from the proper signal.
How do you create a ground loop?
A ground loop is caused by the interconnection of electrical equipment that results in there being multiple paths to ground, so a closed conductive loop is formed.
How are components connected in a ground loop?
In a perfect layout, your components will be connected together properly through ground connections. With only the directly-specified ground connections, components will have a direct current return path, but when a middle ground connection is joined between multiple components, a ground loop is formed.
Why are there no ground loops in Pass Labs?
In order to minimize ground loop issues Pass Labs never manufactures equipment with signal ground and chassis ground contiguous. By separating signal ground and safety grounds, connecting units together should never cause ground loop issues; however, not all manufacturers follow this line of thinking.
How is noise introduced into a ground loop?
If one component on the loop is noisy and the return current flows through shared ground connectors, this noisy component is then the source for an introduction of noise to other components on the loop. This can be catastrophic with different analog or audio components along the same loop as a particularly noisy component.
When do you need to worry about ground loops?
With only the directly-specified ground connections, components will have a direct current return path, but when a middle ground connection is joined between multiple components, a ground loop is formed. In the ideal world, you wouldn’t have to worry about ground loops, because each point on the ground connections will be at the same potential.