| 摘要 |
In a method for ascertaining burden resistance for a measurement transmitter, which is supplied with voltage via a first line-pair and which transmits a variable electrical-current signal via an electrical-current loop to a control system via a second line-pair, a test-voltage signal is capacitively coupled into the electrical-current loop and an associated electrical-current signal evaluated. An instantaneous value of the burden resistance is ascertained from a characterizing feature of the electrical-current signal, especially an RC time constant. Thus, already at start-up of a measurement transmitter, a burden resistance, which is too high, can be detected.
|
