| Noise Type | Source and Effect | Corrections |
| 1. Transmitted noise | Currents flowing in the | Install filters and surge absorber |
| | power line are transmitted | on the power line. |
| | by signal lines. Noise | Use sufficiently heavy earth line. |
| | sources include transient | Use shield cables with
appropiate shield grounding. |
| | and leak current in power | |
| | , ground lines and induced | |
| | current. | |
2. Crosstalk (Electromagnetically
coupled) | Mutual inductances between nearby signal
lines | Use twisted pairs cable.
Separate cable by tape : AC from DC, power from signal,
high frequency from low
frequency, high voltage from
analog. |
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| 3. Crosstalk (Static coupled) | |
Noise voltages are passed
betwwen adjacent cables
due to the static
capacitance associated with the cable insulation. | Transmit signals using twisted pairs or coaxial cable.
Use twisted pairs with shield as
necessary |
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| 4.Radiated noise | | Cable function as antennas, receiving RF
emissions from nearby
equipment. | Use cable with shield coverage
exceeding 80%.
Use fully shield connectors. |
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| 5.Self induced (static noise) | | Static electric discharge
when friction between cable components causes
charge build up on the
insulation. | Use a flexible low friction cable
that can easily accommodate
cable movement, or redesign
the cable mounts to minimize
cables stress during bending
and flexing.
Employ a cable with a
semiconductive layer under the
shield to allow charges to drain
to ground. |
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