Shielded cable grounding
Shielded cable grounding
(OP)
Can someone explain why if I ground both ends of a shielded cable carrying DC signals in a wireway with AC current carrying wires, I get noise, but if I ground just one end, I don't?
Thanks
Thanks





RE: Shielded cable grounding
RE: Shielded cable grounding
RE: Shielded cable grounding
When water waves hit the sides of a pool or a bulkhead, they reflect back into the water.
When waves crash onto the beach, the energy is dissipated and there is little or no reflection.
An unterminated cable looks like the hard pool wall. The resistor acts like the beach and dissipates the energy.
You get maximum energy transfer into the resistor when the cable impedance matches the resistor impedance.
Such resistor installations are recommended with most electrical waveguides. They are commonly installed residentially on cable TV systems -- those little blank caps are actually resistors. Sometimes, if you don't use the resistors on cable TV wiring, the reflectances can cause ghost images in the TV picture.
RE: Shielded cable grounding