Circuit arrangement for correcting weak analogue voltages of measurement value transmitters in the case of severe non-linearity

摘要

The invention relates to a circuit arrangement for correcting or processing weak analogue measurement voltages of sensor elements in which offset and signal voltage are spread over a wide range and are highly temperature-dependent. The measurement voltages are amplified and supplied to an analogue/digital converter, from which they are retrieved for the microcontroller. The microcontroller supplies the digital correction signals as control signals to the amplifier which in each case follows the measurement value transmitter. The special construction of the amplifier makes it possible for the control signals to change both the gain and its offset and to correct the weak analogue measurement voltages during their amplification. The entire circuit arrangement can be actively calibrated by directly supplying the output signals of a temperature sensor to the analogue/digital converter. IMAGE