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 technique. DLC: Electromagnetic compatibility.
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Additional resources for Testing for EMC Compliance: Approaches and Techniques
3 COMMON-MODE CURRENTS VERSUS DIFFERENTIAL-MODE CURRENTS Noise source in load I1 ~ ~ 35 Noise source in load I1 ~ ~ Z I2 I2 IЈ2 Common-mode current configuration. I2Ј is a virtual return path through free space or other parasitic path. Not all "desired" return current will flow in I2 due to inductance or losses in the transmission line. The remainder of the "desired" return current will therefore flow in I2Ј. A summation of currents must flow in both paths to satisfy Amperer's Law. A negative current flow will exist in I2, traveling in the opposite direction to satisfy Ampere's Law.
The 1 : 1 condition means that there are no losses within the transmission line between source and load, thus ensuring accurate data are recorded. When an antenna approaches or exceeds a quarter wavelength, significant measurement error may be introduced. 3. Background Noise within Instrumentation Setup. This problem is usually observed at test sites. A support unit such as an ancillary printer might be the cause of a problem, although the printer carries a certificate indicating compliance. The only way to ascertain if the signal observed is from the EUT or auxiliary unit is to power down the auxiliary.
An equal value of return current must be present. These two currents, traveling in opposite directions, represent standard DM operation. Fields not coupled to each other will be the source of common-mode EMI. In the battle to control undesired emissions and crosstalk, through the common mode, the key is to control excess energy fields through proper source control and careful handling of the energy-coupling mechanisms. 2 Common-Mode Currents Common-mode current is the component of RF energy that is present in both signal and return paths, often in common phase to each other.
Testing for EMC Compliance: Approaches and Techniques by Mark I. Montrose