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5. Background noise on measurementsIn the case of background noise on the measurements, check the following points:. Check the reference electrode (defective reference electrode, unsaturated orcontaminated liquid junction, clogged junction, air bubble trapped), and checkthe reference electrode connecting cable.. Shield the measurement cell in order to eliminate the interference due tomains (50/60 Hz) or to the other external electromagnetic sources (example:a metal desk). Do not hesitate to place the measurement system in a Faradaycage and connect the cage to the functional ground socket (see Section 5.1.2)on the rear panel of the PGZ or PST potentiostat.. Check whether the measurements are performed under stirring(hydrodynamic noise).. Increase the Filter value. The filter value is selected in the parameter dialoguebox of the method as shown below for a Chrono Potentiometry. Never set theFilter value to “No”. This position is dedicated for instrument control.We recommend you the AUTO option for the filter as VoltaMaster 4 will findthe best filter value according to the potential (or current) step duration of <strong>your</strong>experiment.124VoltaLab 21/06/10/40/50/80Section 5, Chapter 1: The PGZ and PST series

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