Noise Rejection

A well-designed power conditioner provides rejection of normal mode as well as common mode noise. These conditioners are equipped with a electrostatic or Faraday shield between the primary and secondary windings. These shields are made of a conducting sheet of non-magnetic material, usually copper or aluminum. Grounding these shields reduces capacitive coupling between the windings, and blocks the passage of high frequency noise. A more expensive power conditioner is equipped with additional shielding around each winding to further reduce capacitive coupling. In choosing a good quality line conditioner, look for one which will reduce high frequency noise by 60 dB or more.