| 摘要 |
A converter circuit serves to transform a digital measuring signal representing the chronological sequence of a periodically changing physical and/or chemical measurand into an analogue measure value signal dependent on the digital measuring signal with a signal current, an amperage of which represents a measuring value for the measurand. For this purpose the converter circuit comprises a current interface with a control input, with a current signal output and a current output. In addition, the converter circuit comprises 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 control output connected to the control input of the current interface. The current interface is designed to let the signal current flow through the current output and simultaneously adjust both the amperage to a stationary amperage level corresponding to a control value currently applied to the control input, and to output a sequence of current values at the current signal output. Furthermore, the micro-processor is designed to generate a measuring value sequence on the basis of the digital measuring signal and use it as the basis from which to generate a control value sequence and issue it at the control output as well as to monitor and/or check the current interface using the control value sequence and the current value sequence. |
