2021 Volume 14 Issue 2 Pages 155-159
There is an incentive in the market to design and develop electronic devices and components, especially safety controllers, which are resistant to malfunctioning when exposed to unexpected electromagnetic noises. This paper describes the experimental results of EMS (electromagnetic susceptibility) of an electrostatic controller that supplies electrical power to an electrostatic spray gun (equipment under test: EUT). The high voltage applied to the needle electrode of the spray gun was approximately -46 kV and was monitored during the entire testing. In this study, EMS tests were carried out in the 3 m method anechoic chamber. The values of electromagnetic noise (electric field strength, V/m) applied to the EUT were 2 to 4 times stronger than those mentioned in the IEC standard test (frequency range: 80 MHz to 1000 MHz, emission time; 2 s). As for the results, no malfunctioning was observed under the experimental conditions. To be precise, the applied voltage on the needle electrode was slightly dropped to -40 kV when applying 90 MHz and 170 MHz; however, such a drop cannot be representative of a malfunction. This implies that the EUT used in this experiment is made to withstand field strengths that exceed the IEC standard in terms of noise immunity.
