EMC includes the electromagnetic couplings around the object in two ways:
Influence from (1) or to (2) other systems:
The 1st includes immunity for (electro-)magnetic RF-fields, electrostatic discharge (ESD),
magnetic pulses from inverters or lightning , and voltage-spikes and -bursts
at (power-) cables.
The 2nd includes emission or radiation of electro-magnetic RF-fields at a distance of 10 meters,
mostly caused by unwanted currents in tracks, cables or inductors, or electric fields from wiring or ´hot´ PCB-areas and pads.
One of the design challenges in switching power electronics is handling the RF-Emission below the EMC-limits.
Essential for EMC-engineering are means for measuring the RF-radiation, and finding the precise origin of it.
For accurate measuring of real RF-radiation at 10 meters, directional antennas are needed in a large free space,
depending on the wavelength. We can do these field-measurements at a local test-facility.
However, when EMC-problems do occur at frequencies corresponding to wavelengths larger than the size
of the test-object, in many cases the emission is caused by common-mode RF-currents in cables connected the
object and can be measured via current-probes in these cables.
In other cases, small current loops on the PCB, in wiring, or leaks in shielding, can create a local magnetic field
which will generate distant electromagnetic radiation.
REBIX has the means and experience for measuring the local magnetic and electric fields, from
which the distant radiation can be calculated, with an accuracy similar or beter than the conventional measuring methods with directional antennas in free space.
During the measurements we will upgrade the product with extra components or layout-changes
until the radiation is well below the EMC-limits.