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Signal generator for measuring apparatus and measuring apparatus for automation technology

A signal generator and measuring equipment technology, applied in the liquid level indicator, digital function generator, measuring device and other directions of physical variable measurement, can solve problems such as multi-energy, achieve robust cost-effective, simple signal generator, and has cost-effective effect

Active Publication Date: 2016-03-02
EHNDRESS KHAUZER GMBKH KO KG
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  • Signal generator for measuring apparatus and measuring apparatus for automation technology
  • Signal generator for measuring apparatus and measuring apparatus for automation technology

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Embodiment Construction

[0046] figure 1 A device is shown for at least capacitively determining the fill level of a medium 17 in a container 16 . The signal generator 5 of the present invention is used in this device. The capacitive measuring device 1 comprises a detection unit 2 , wherein the detection unit 2 protrudes inwards into a container 16 . In the illustrated embodiment, the detection unit 2 comprises a detection electrode 14 and an insulation 15 , wherein the insulation 15 completely surrounds the detection electrode 14 and electrically isolates it from the liquid medium 17 . The wall of the container 16 forms the counter electrode of the detection electrode 14 . However, it is equally possible to introduce a second probe with a reference electrode into the container 16 . With such a detection unit 14 the fill level of the medium 4 can be continuously determined. However, the invention can also be used in the case of a device for capacitive recording of limit levels, where the device is...

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Abstract

The invention relates to a signal generator for generating periodic signals for a measuring apparatus (1) in automation technology, wherein the signals have successive discrete signal frequencies which are within a predefined frequency range, having a control and / or computing unit (4), having a clock generator (6), wherein the clock generator (6) provides a constant sampling frequency which is greater than the maximum discrete signal frequency in the predefined frequency range, having a storage unit (7) in which the amplitude values of the corresponding periodic signals are or can be stored for each of the discrete signal frequencies on the basis of the sampling frequency, wherein the control and / or computing unit (4) gradually reads the stored or storable amplitude values of the discrete frequencies from the storage unit (7) at the sampling frequency of the clock generator (6) and generates the periodic signals or forwards the latter for generation, and having a static filter unit (12) with a cut-off frequency which is above the maximum signal frequency and removes the frequency components caused by sampling.

Description

technical field [0001] The invention relates to a signal generator for generating a periodic signal for a measuring device and a measuring device to which the signal generator of the invention is applied. Preferably, the signal generator is used in a capacitive measuring device. However, the signal generator can also be used in electronic vibration measuring equipment. A preferred field of application for the measuring device is automation technology. Background technique [0002] Measuring devices based on the capacitive measuring principle are often used for level or limit level measurement in liquid media. In addition to filling or limit levels, such measuring devices can also be used to determine and / or monitor the electrical conductivity and / or permittivity of a medium. For this, the material level must remain constant. Furthermore, the capacitive measuring device can detect deposit formation on components of the measuring device in contact with the medium. [0003...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/03G01F23/26
CPCG01F23/266G06F1/0321G06F1/0328G06F1/08
Inventor 斯特凡·鲁姆勒-维尔纳迪特马尔·弗吕奥夫阿尔明·韦内卡伊·乌彭坎普戈尔德·贝希特
Owner EHNDRESS KHAUZER GMBKH KO KG
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