Device for the conversion of an electric magnitude into an electrical signal which frequency is representative of said magnitude and transducer making use of said device

摘要

In the device according to the invention, the calibrated loads are obtained by means of two calibrating circuits powered from the same current source (V0), one of these circuits comprising a capacitor (C3) connected to the source (V0) via a switch (S'3) and to the input of the integrator (I) via a switch (S'1) and the other calibrating circuit comprises a capacitor (C4), of the same capacitance as the first, and connected to the source (V0) via an inverting amplifier (IN) in series with a switch (S'4) and to the input of the integrator (I) via a switch (S'2), control of the switches (S'1, S'2) being carried out by at least one monostable circuit (4) triggered by a circuit (2, 3) for detecting the output voltage level from the integrator (I). The invention makes it possible to eliminate variations in the scale factor which occur depending on whether the current to be measured is positive or negative. IMAGE