|
An electrical noise is a random, sporadic or multifrequency electrical signal that becomes part of a transmission making the signal or information more difficult to identify. We find in instrumentation electronic circuits various noises, which have to be collected and reduced, as the electronic material used is very sensitive.
Magnetic noise: When a current flows through a conductor, a magnetic field radiates around it. Two means can be used to reduce this noise: put the cable into a steel tube or twist the wire of the pair with a short lay length.
Static noise: It is an electric field generated by potential sources surrounding an industrial installation. It can be reduced by placing an electrostatic screenaround the cable. Better results have been obtained with an aluminium tape rather than with copper braid or copper wires
Crosstalk: It is an unwanted transfer of signals from one circuit to another. Crosstalk typically occurs between adjacent circuits. Two means can be used to solve this problem. Supply each pair through transformers at each end in order to insulate the considered pair from the earths, or shield each pair and earth the shielding.
These different noises and crosstalk are taken into consideration in the design of our following instrumentation cables range.
|
