Verfahren zur Wandlung eines gemessenen Signals, Wandler zu dessen Ausführung sowie Messanordnung

A method and apparatus for convening a measured signal which, at least in a first approximation, is related to a quantity of interest by the equation (a): where y is the quantity of interest, x is the measured signal, and k, kN, kZ are constants, into a signal that is a function of the quantity of interest. The method implements the function (b): ln y=prop. ([ln (x-kN)-ln (kZ-x)]) wherein prop. means proportional, and where the function is implemented in an approximated manner by at least two bipolar transistors that have base emitter voltages that are dependent on collector currents of the bipolar transistors for receiving an output signal according to the equation (c): y'=ln y, with y' being the output signal.