| 摘要 |
The invention relates to a measuring circuit comprising
- an evaluation circuit (13, 63);
- a sensing circuit (39, 40) comprising a sensing element (6, 55) configured to generate a measuring signal from a measuring object (7) and a transmission line (26, 69) for transmitting the measuring signal to the evaluation circuit (13, 63); and
- a test signal injection circuit (21) comprising a signal injector (12) and an injection line (20) connecting a signal output of the signal injector (12) with the sensing circuit (39, 40) for feeding a test signal into the sensing circuit (39, 40) such that the test signal is transmittable to the evaluation circuit (13, 63) over the transmission line (26, 69). To provide the measuring circuit with an improved surveillance and/or testing operability, the invention suggests that the injection line (20) and the transmission line (26, 69) are interconnected in series via the sensing element (6, 55) such that said test signal can be fed through the sensing element (6, 55). |
