US Patent 7,791,353 B2
Introduction
Simple Circuit Concepts
Transmission lines
Faraday's law
Near and far fields
Spurious coupling mechanisms
- Direct conduction
- Capacitive coupling -problem
- Capacitive coupling -fixing
- Inductive coupling-problem
- Inductive coupling -fixing by twisted
- Inductive coupling -fixing by coax
- Electromagnetic pickup
- Examples
- Safety & star grounding
- Gnd loop resistance, inductance
- Low frequency behavior
- High frequency behavior
- Troubleshooting
- Methods for removing
Spurious coupling via direct conduction
Direct conduction occurs when as shown in Fig. 4 a stray conductive path exists between the source of the offending signal and the system being contaminated. This situation, called a short or leakage, occurs when there is worn insulation, a wiring mistake, or un-insulated signal wires immersed in a conducting medium. Prevention involves identifying and then eliminating the unwanted conductive path.
Direct conduction occurs when as shown in Fig. 4 a stray conductive path exists between the source of the offending signal and the system being contaminated. This situation, called a short or leakage, occurs when there is worn insulation, a wiring mistake, or un-insulated signal wires immersed in a conducting medium. Prevention involves identifying and then eliminating the unwanted conductive path.
Find ground loops fast!
-eliminate electical interference, fix star grounding
-eliminate electical interference, fix star grounding
US Patent 7,791,353 B2
Fig. 4 Spurious current I (shown as red) from external voltage V enters signal circuit through stray conductive path and adds to desired signal current (shown as green).
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