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What can I adjust with zero/span potentiometers?

Stray current in the measuring circuit causes signal distortion, which can be compensated easily with the ZERO potentiometer at the front of the isolation amplifier. Production tolerances of the shunt resistor can easily be corrected at the percent level using the SPAN-Poti, which means that, for example, an SPS obtains a correct measured value.

Is the shunt resistor installed in the isolation amplifier?

No, the shunt voltage is tapped directly on the shunt and directed to the input of the shunt isolation amplifier. The input areas of our shunt isolator are aligned with the commercial shunt voltages.

Strong currents to be measured are directed via shunt resistors in order to measure the drop in voltage there. The comparatively low voltage at the shunt is tapped directly on the shunt and directed to the input of the shunt isolation amplifier using the 4-pole technique (also known as Kelvin connections or Kelvin contacting).

A shunt for measuring strong currents

Shunts are used to measure dc currents, especially in the case of high amperages. Voltage drops on the shunt proportionate to the current and is then connected to the input of a shunt isolation amplifier for further processing.

Shunts are typically manufactured in class 0.5 in compliance with DIN 43703 and are designed for rated currents in the range between 1 A and 15,000 A. The drop in voltage in the case of the rated current is stated to be 60 mV or 150 mV, depending on type.

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