POTENTIOSTAT

摘要

The invention relates to a potentiostat (1) containing a control logic (41) and an electronic circuit, whereby the electronic circuit of the potentiostat contains an analog block (2), a converter block (3) consisting of analog-numeric and numeric-analog converters, and a supply block (5). The analog block (2) contains a connecting means (21) having a contact (211) for connecting a working electrode of a sensor, a contact (212) for connecting a reference electrode of the sensor and a contact (213) for connecting an auxiliary (common) electrode of the sensor, whereby the contact (212) for connecting the reference electrode of the sensor is connected to the non-inverting input of the operational amplifier (222) and the contact (213) for connecting the auxiliary (common) electrode of the sensor is connected to the output of the operational amplifier (221), whereby the output of the operational amplifier (222) is connected to the inverting input of this operational amplifier (222) and, at the same time, to the inverting input of the operational amplifier (221), and the contact (211) for connecting the working electrode of the sensor is connected to the inverting input of the operational amplifier (23) and at the same time through a switchable resistor network (231) to its output, whereby the non-inverting input of this operational amplifier (23) is connected to a source (232) or precise voltage, and its output to the non-inverting input of a differential operational amplifier (24) as well as to the input of a low-pass filter (25) of first or higher order.