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Ferrite Chokes Block Common-Mode Currents
- Commonly used on keyboard, mouse or video cables
- Extremely useful for troubleshooting
- Manufactures frequently have free evaluation kits
- Best used on low-impedance cables
AC Line Cord Emissions
- If AC line cord is suspected of emitting high-frequency harmonics, insert an external line filter in series. If the emission level (or measured common-mode current) drops, then improved line filtering is required.
- An external filter can be constructed with an extra power line filter module and spare AC line cord.
- Cut the cord down to minimal size and carefully solder the stripped ends to the filter, observing the correct connections. Wrap with electrical tape.
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A Current Probe used to Measure a Cable's Common-Mode Currents |  |
Testing a Bare PCB (printed circuit board) for Radiated Emissions and Analyzing of Crystal Oscillators | |