Endress + Hauser Flowtec Ag

Christian Wegner

Stefan Pflüger

For calibrating high frequency based field devices, a first switching unit is provided between the antenna arrangement and the transmission amplifier and receiving amplifier of the field device. For ascertaining the corresponding calibration factors, the first switching unit can assume switch positions at which the signal production unit and/or the evaluation unit are/is connected with the antenna arrangement, and at which the transmission path and/or the receiving path are/is connected with an attenuation element via which the transmission path is connectable with the receiving path. An evaluation unit of the field device ascertains at least at these switch positions the corresponding characteristic variable to use these in the later measurement operation as calibration factors. Advantageous with this kind of calibration of the invention is that possible couplings of the amplifiers are compensable.

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Schwörstadt, Germany

Christian Wegner