| 摘要 |
PCT No. PCT/DE93/00723 Sec. 371 Date Feb. 13, 1995 Sec. 102(e) Date Feb. 13, 1995 PCT Filed Aug. 9, 1993 PCT Pub. No. WO94/04931 PCT Pub. Date Mar. 3, 1994A level measuring set for low-frequency signals with superimposed direct voltage includes a low-pass filter, a measuring rectifier, and a subtractor. A low-frequency measurement signal is supplied to the low-pass filter, which outputs a reference potential (UB) which corresponds to the direct voltage. The reference potential (UB) is applied to a reference point of the measuring rectifier. The measuring rectifier forms a positive and a negative direct voltage component (+UM, -UM) superimposed on the reference potential (UB) for the positive and negative half-waves of the low-frequency signal, respectively. The subtractor receives at inputs thereof the positive and negative direct voltage components (+UM, -UM) superimposed by the reference potential (UB) and emits a level measurement value of the low-frequency measurement signal.
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