Digital measuring instrument

Details Digital measuring instrument Digital measuring instrument

G - Physics

01

R

324/59

G01R 19/25 (2006.01) G01R 21/133 (2006.01)

Patent

CA 1285322

- 30 - ABSTRACT The digital measuring instrument samples at dis- crete points in time the analog output signals emitted by a measurement transducer (2) of an electrical supply sys- tem in a sample and hold circuit (4), subsequently digi- tizes the sampled values in an analog/digital converter (5) and then forms a system-specific quantity such as, for example, the root mean square value or the system frequen- cy from the digitized values in a digital processing unit (6). This measuring instrument is intended to be suit- able for solving the essential measurement value process- ing tasks occurring in an electrical supply system in a simple manner and with projectable measurement accuracy. This is achieved by the fact that the digital pro- cessing unit (6) exhibits a block (7) for shifting the frequencies (.omega.1, .omega.i) of fundamental and harmonics to 3 direct-current signal (DC) which is proportional to the system-specific quantity and a subsequent filter arrange- ment (8) with a digital low-pass filter (100) for suppres- sing the frequencies (.omega.1, .omega.i) deviating from the direct- current signal (DC) and a digital band-stop filter (110) for suppressing aliasing frequencies. (Figure 1)

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