Erroneous practices in measuring discontinuous disturbances

CISPR has defined a standard regarding the radio-frequency disturbance level of appliances (CISPR 14-1). The scope of this standard is to worldwide fix disturbance limits and standardise methods of measurement, operating conditions, and interpretation of results. Today, there exist special discontinuous disturbance analysers (“click analysers”) that perform both measurements and analysis. However, the analysis performed by some click analysers is not in accordance with the procedure defined in the CISPR 14-1 standard. This leads to appliances on the market being incorrectly declared CISPR 14-1 compliant. The intention of this article is to address and clarify possible misinterpretations of the CISPR 14-1 measuring procedure of discontinuous disturbances.