Patent ID: 11892483
Assignee: ISABELLENHUETTE HEUSLER GMBH & CO. KG
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 21:
22. A current measuring resistor for measuring an electric current, comprising:
a) a first connection part comprising a conductor material for introducing the electric current into the current measuring resistor,
b) a second connection part comprising a conductor material for conducting the electric current out of the current measuring resistor, and
c) a resistor element comprising a low-resistance resistance material, the resistor element being arranged in a direction of current flow between the first connection part and the second connection part and being joined to the first and second connection parts so that the electric current to be measured flows through the resistor element during operation and produces a voltage drop across the resistor element,
wherein:
d) the first connection part, the second connection part and the resistor element each have a substantially round cross-section in a sectional plane at right angles to the direction of flow of the electric current,
e) a printed circuit board is attached to an outer surface of the current measuring resistor in order to measure the voltage drop across the resistor element,
f) several pairs of voltage taps are provided, each pair of voltage taps measuring the voltage drop across the resistor element and providing a corresponding voltage reading,
g) the pairs of voltage taps are distributed over a circumference of the current-measuring resistor in order to measure the voltage drop across the resistor element at a plurality of different points distributed over the circumference of the current-measuring resistor,
h) the pairs of voltage taps are connected to a measuring circuit which determines the voltage drop across the resistor element from the measured values,
i) the measuring circuit calculates the voltage drop across the resistor element from the weighted voltage measured values,
j) the measuring circuit is not arranged on the printed circuit board but on at least one separate measuring card which is connected to the printed circuit board by a line,
k) the measuring circuit is connected to a data interface in order to transmit measured values of the voltage drop to an external evaluation unit, and
l) the data interface is an electro-optical data interface which transmits the measured values to the external evaluation unit via an optical waveguide.