Noise is conducted from the DC power supply and GND lines to the switching power supply and radiated from the AC power supply cable. To suppress the noise, the BLMxxP Series (Chip Ferrite Bead) is inserted onto each power supply line (including the GND line).

If the noise level is high, the NFMxxP Series (Chip Solid "EMIFIL®" for DC power supply circuits) is installed in addition to the chip ferrite bead.