Susceptibility of the Instrumentation to Conducted EMI Injected Through the Ground Plane

This article presents the effects of electromagnetic interferences in common instrumentation, like multimeters and oscilloscopes. This investigation is of paramount importance when the interferences can directly reach the instrumentation used to verify the susceptibility of the circuits under test. In particular, the referred case of study is that of electromagnetic interferences injected through the ground plane into the output terminals of the analog integrated circuits. The measurements show that the susceptibility of the instrumentation depends on the amplitude, the coupling, and the frequency, but generally it remains low and mostly negligible.