Precision DC, AC and High-Frequency Pulsed Current Shunts: Selection Guide

current splitter is designed based on Ohm's Law principle, where the measured current passes through a resistor with a fixed resistance value, and then the measured current is calculated based on the resulting voltage drop. According to application category, current splitters are usually divided into pulse/high-frequency current shunts and high-precision DC current shunts.

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pulse/high-frequency current splitter>:

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• bandwidth: refers to the maximum measurable current frequency of the shunt, usually including DC;

• impedance value: refers to the resistance value of the shunt resistor; According to Ohm's Law, the resistance value determines the ratio of the measured current to the voltage across the two terminals, and also indirectly determines the maximum power consumption of the shunt; Of course, it also directly determines the value of the shunt;

• Power: Based on impedance and power, the maximum measurable current value of the shunt can be determined

** Usually, the precision of pulse shunt is not a decisive criterion;


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High-precision DC current shunt device:

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• Rated current: The range of the shunt

• precision: The absolute precision of the value shunt (usually not the most critical metric).

• Preheating time: For high-precision DC current shunts, a certain preheating time is required before measurement accuracy can be guaranteed

• Time stability: The shunt resistance value changes over time, and annual stability is usually used to define the extent of resistance change.

• Temperature stability: The resistance value of the shunt directly determines measurement accuracy, but its resistance value is easily affected by temperature variations.

• Power factor: Refers to the change in accuracy caused by the temperature variation accumulated from the difference between the Joule heat generated and the heat dissipation during the shunt's own measurement process.