EMERSON 12P1064X102, KJ3004X1-BA1, Fieldbus H1 Card

EMERSON 12P1064X102, KJ3004X1-BA1, Fieldbus H1 Card Description:

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Unik You
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Isolation of the digital signal receiver from ground is important as a means for rejecting noise which causes both wires in a signal pair to change voltage-to-ground potentials. An example of this type of isolation is a signal source (transmitter) which is grounded at a point remote from the receiver, where transmitter and receiver grounds are not at the same voltage. In this case, ground potential difference appears as a voltage on both wires of the corresponding signal pair. Another example in which isolation may be required to reject ground potential difference noise would be in circuits where coupling exists between signal wires, inducing a potential in both wires. Induced potentials can occur when signal wires are present in environments with changing electromagnetic or electrostatic fields. Isolation may be required in this case.

Analog signal filtering is achieved by averaging applied signals for one cycle (or an integer multiple of cycles) of the AC power line frequency. Power line related noise, at the power line frequency and its harmonics, has exactly zero average value when the average is taken over exactly one cycle and is filtered out of the signal by this technique.