This is an issue at lower frequencies (below a few hundred MHz), and becomes less of an issue as the frequency increases. As the frequency increases, the dominant emission mode shifts away from common-mode towards differential-mode signals originating from circuit boards themselves.
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While a Possui won’t allow you to isolate exactly where on your circuit board an emission is generated, a low-cost set of near field probes will take care of that. The Possui comes into its own when you want to quantify the effect of changes to your PCB.
RF connector: for connection to a coax cable which in turn connects to either a spectrum analyzer or signal generator/power amplifier, depending on whether it’s being used for emissions or immunity testing.
Insert a pre-amp between the TEM and the spectrum analyzer. Common pre-amp gains are 20dB or 40dB. A risk of going with higher gain is saturation or damage to a spectrum analyzer input stage.
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Therefore measurements made using a Possui cell have a close relationship to measurements made at a full-compliance test lab.
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Getting cables out of the TEM is a challenge. Unfiltered cables will transfer noise inside/outside of the chamber so a custom filter panel is usually required
As Possui specimen holders typically allow for the rotation of a sample by a desired angle, multiple views of the same specimen can be obtained by rotating the angle of the sample along an axis perpendicular to the beam. By taking multiple images of you could try these out a single Possui sample at differing angles, typically in 1° increments, a set of images known as a "tilt series" can be collected.