CIRCUIT FOR AMPLIFYING A WEAK DIRECT VOLTAGE SIGNAL

摘要

A circuit for amplifying a weak direct voltage signal has a direct voltage amplifier which may be periodically switched from the direct voltage signal to a reference signal by a switching member connected to its input terminals, as well as a measurement value processing arrangement connected downstream of the direct voltage amplifier. In order to obtain with such a circuit arrangement an amplified direct voltage signal which very precisely corresponds to the weak direct voltage signal to be amplified, the switching member (29) is a periodical short-circuiter (28) arranged between the input terminals (26, 27) of the direct voltage amplifier (25).