Converter circuit with current interface and measuring device with such respective converter circuit

A converter circuit transforming a digital measuring signal representing a temporal course of a changing physical and/or chemical measurand into an analogue measure value signal dependent on said digital measuring signal, said analogue measure value signal exhibiting a signal current, whereby an amperage of said signal current represents a measuring value for the measurand;

• said converter circuit comprising:
• a current interface, with a control input, with a current signal output, and with a current output;
• and a micro-processor with a measuring signal input for the digital measuring signal, with a current signal input connected to the current signal output of the current interface, and with a current signal output connected to the current signal output of the current interface;
• said current interface being configured for letting the signal current flow through the current output while adjusting the amperage of the signal current to a current value currently applied to the control input to an appropriate stationary amperage level in such a way as to make each of the stationary amperage levels dependent on a respective control value as determined by a characteristic curve function of the current interface as well as for outputting at the current signal output a current value sequence, said current value sequence representing a temporal course of the signal current amperage and said current value sequence being a sequence of digital current values representing the current amperage for different points in time;
• said micro-processor being adapted to generate, based on the digital measuring signal at the measuring signal input, a measuring value sequence, said measuring value sequence representing a temporal course of the measurand for different points in time and said measuring value sequence being a sequence of digital measuring values each momentarily representing the measurand in turn, as well as to output a control value sequence at the control output based on the measuring value sequence, said control value sequence being a sequence of digital control values for the current interface;
• and
• said micro-processor being adapted to monitor and/or check the current interface based on the control value sequence and the current value sequence.