Pulse Mode

In addition to the DC Mode, some electrochemical detectors can be operated in the Pulse Mode. This method is also called PAD (pulsed amperometric detection) and is characterized by a series of potential changes. This method allows a continuous regeneration of the electrode surface (platinum or gold electrode).

In PAD, a distinction is made between three different potentials (E1, E2, E3) and the period (T1, T2, T3) for which a potential is connected to the electrode. T1 + T2 + T3 form a cycle that is constantly repeated.

Data is recorded only during the second half of T1 (= Ts). The duration of Ts is either set directly or is determined by defining a delay T1´ (stabilizing phase).

The material of the working electrode largely determines the period and the height of the various potentials.