By Mark I. Montrose
Textual content bargains an easy and effective troubleshooting consultant designed to demystify what can frequently be a time-consuming and expensive debugging procedure. DLC: Electromagnetic compatibility.
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Extra info for Testing for EMC Compliance: Approaches and Techniques
Sample text
Magnetic sources (flows in closed-loop configurations, represented by a loop antenna) 2. 1. All waves are a combination of electric and magnetic field components. 1 Wave impedance versus distance from E and H sources. 1 RELATIONSHIP BETWEEN ELECTRIC AND MAGNETIC FIELDS 19 netic fields a plane wave or Poynting vector. The Poynting vector is a convenient method for expressing the direction and the power of the EM wave with units of watts per square meter (W/m2). In the far field, both electric and magnetic field components are at right angles to each other and perpendicular to the direction of propagation.
B) Terminate the coax at the antenna end with a 50-⍀ load. This evaluates whether the coax is at fault. If a problem is noted, reroute the coax, shorten the length of the cable, or secure it against the ground reference and see if the undesired signal goes away. (c) Install ferrite cores, or clamps, on the coax. Sometimes, it takes up to 30 ferrite cores to remove the common-mode energy on the shield due to external ambients or a damaged cable shield. (d) Place ferrite cores on the AC mains cables.
Complex topic. Although not mathematically or precisely correct, it helps one to visualize the difference between CM and DM currents and how common-mode is the result of an imbalance in differential-mode propagation. The flow of current from source E to load Z in DC terms is represented as I1. The alternating current is propagated as an EM field in the same transmission path. Return current (both AC and DC) travels back to the source in I2. 12). This secondary RF return path is sometimes called an image plane, ground plane, or 0-V reference when referenced to a PCB.