| __World Intellectual Property Organization__ *(Site not responding. Last check: 2007-11-07)* |

| | **Electrochemical** noise measurements typically record the **electrochemical** current noise (ECN), that is the fluctuation in the current between two nominally identical electrodes, and the **electrochemical** **potential** noise (EPN), that is the fluctuation in **potential** of the current-measuring pair of electrodes with respect to a reference electrode. |

| | Given that the applied **potential** fluctuation is also known, the impedance of the working electrode at the or each applied frequency can be calculated from the known **potential** fluctuation and the known current fluctuation at the or each frequency by dividing the voltage fluctuation by the current fluctuation. |

| | signal which represents the **electrochemical** current noise, a measure of the impedance of the working electrode is derived from the applied current signal and the response signal, and a signal representing **electrochemical** **potential** noise is derived from the filtered signal and the derived impedance measure. |

| www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/106976.031224&ELEMENT_SET=DECL (2333 words) |