As a mechanically biased engineer with a reasonable knowledge of electrics i would be grateful if you could explain a concept i am a little confused on in simple terms.
When using sheilded cable to protect from capactive coupling interference do you have to connect the sheild (i know at source end only) to earth, to the system reference point (0v) or does the 0v need connecing to earth as well in order for it to be effective.
i have read some instructions that say connect to circuit reference point only and not chassis ground. i,e floating shield, and others that say make sure reference point is grounded to earth.
What is the correct method or is there times when you would use one and not the other.
Does the method depend on weather your attemping to stop noise escaping from the sheild or stop noise passing through the shield from external devices onto your cables.
i have asked some electricians i work with and i get the impression there not sure why they are doing what there doing and looking it up on the net can be confusing due to the use of the word ground i.e some people use it to refer to the system reference point and others refer to it as earth.
What happens to the sheilding when the sheild is used as signal return.
If anyone can clarify the above in simple terms and explain when to use each application it would be very appreciated, Thanks
When using sheilded cable to protect from capactive coupling interference do you have to connect the sheild (i know at source end only) to earth, to the system reference point (0v) or does the 0v need connecing to earth as well in order for it to be effective.
i have read some instructions that say connect to circuit reference point only and not chassis ground. i,e floating shield, and others that say make sure reference point is grounded to earth.
What is the correct method or is there times when you would use one and not the other.
Does the method depend on weather your attemping to stop noise escaping from the sheild or stop noise passing through the shield from external devices onto your cables.
i have asked some electricians i work with and i get the impression there not sure why they are doing what there doing and looking it up on the net can be confusing due to the use of the word ground i.e some people use it to refer to the system reference point and others refer to it as earth.
What happens to the sheilding when the sheild is used as signal return.
If anyone can clarify the above in simple terms and explain when to use each application it would be very appreciated, Thanks