Examples of actions taken to comply with the CISPR25 standard governing radio emissions (noise emitted) from devices mounted in vehicles

EMI Suppression Filters (EMC and Noise Suppression)Summary of CISPR25 Class 5 power line noise suppression measures

Summary of power line noise suppression measures

Communication in the USB 2.0 and USB 3.0 modes was initiated between a PC and hard drive and, in an environment complying with the CISPR25 standard, the noise radiated from the USB cables was evaluated.

As a result, the following was verified when the BLM31PG601SH1 Open in New Window was inserted into the power line:

The noise during USB 2.0 communication was reduced by:

  • Approx. 14 dB (at a horizontally polarized wave frequency of 76 MHz)
  • Approx. 13 dB (at a vertically polarized wave frequency of 227 MHz)

The noise during USB 3.0 communication was reduced by approx. 9 dB (at a vertically polarized wave frequency of 111MHz).