FIELD: electric engineering.
SUBSTANCE: measuring circuit is used for transmission of control of industrial processes, namely differential detector for the transmitter is described. Pair of sensitive capacitors with capacitances C1 and C2, which capacitances are determined by variable value of process, are connected with bridge unit X, which is in turn connected with summing unit Y. Reference capacitor Cref, connected with summing unit, has capacitance Cref higher than expected maximal difference of capacitance of pair of capacitors |C1-C2|max. Switches 30-46, 50-58, 62, 64 selectively communicate sensitive capacitors and reference capacitor with at least first and second voltages V+ ref and V- ref to select charges, which have to be |C1-C2| and Cref.
EFFECT: improved stability of measuring circuit.
26 cl, 5 dwg
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