HONEYWELL 51410069-275 CC-PAIH51 Automatic industrial control spare parts inventory
Technical data of product parameters
Both analog and digital signals can be discriminated easily by eliminating
frequency content from external noise sources, such as switching transients, since 51410069-275 CC-PAIH51
the transients do not contain appreciable energy below 0.5 MHz frequency. Low
pass filtering is useful in recovering analog signals from either power line or
transient noise and for recovering digital signals from transient noise. Figure 2-2
shows an example of these two types of noise.When signals are originally generated, most are relatively noise-free. The bulk of
the noise present on a received signal has been added to the signal during its
transmission. Isolation and segregation of signal sources and wiring from noise 51410069-275 CC-PAIH51
sources is highly effective as a recovery means. This technique, as well as the
low-pass filtering previously mentioned, serves to reduce the recovery problem to
one of amplitude or energy level discrimination.For details on the selection and spacing of field wiring with respect to noise, refer
to “Planning and Installing Your Ovation SystemLow pass filtering and the use of large signal level techniques provide frequency and
energy level discrimination, respectively.
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 pairAnother example in which isolation may be required to reject ground potential
difference noise would be in circuits where coupling exists between signal wires, 51410069-275 CC-PAIH51
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.
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Introduction to main products
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