Summary:A shunt is an electrical device that reduces the total current in a circuit by diverting some of the current to another point. It is commonly used in ......
A shunt is an electrical device that reduces the total current in a circuit by diverting some of the current to another point.
It is commonly used in measuring equipment to extend the range of current that can be measured using a self-contained digital or analog dc ammeter. These shunts are available in a variety of shapes and sizes, depending on the requirements of the application, and can be designed to handle very high levels of current.
They offer a simple and cost-effective solution for accurate measurements that exceed the limits of a standard ammeter. The current shunt is typically connected to the ammeter via a resistor bridge, with one terminal of the resistor serving as the reference and the other terminal being the shunt connection. This connection is also known as the Kelvin configuration. The shunt will require calibration to ensure the output of the sensor is properly compensated for temperature and other factors.
During the shunt calibration process, it is important to avoid re-setting the amplifier and putting the shunt under load. This will cause the sensor to reset and alter the measurement result. The best way to avoid this is by doing a "Short on for 1s" and then "Shunt on for 1s". This will allow the amplifier to zero out and not change the channel min/max limits or shunt current limit during the measurement.Once the shunt has been calibrated, the amplifier and shunt should be removed from the system and allowed to cool down completely.
This will prevent any residual heat from influencing the measurement result. The shunt should be cooled to around 70oC. It is also recommended to perform a lead wire compensation using the following equation:
This will compensate for the sensor offset and eliminate any potential interference in the signal. This value will then be stored with the sensor data in the Dewesoft X setup file. This will allow you to use the same Dewesoft X setup file for all subsequent measurements, even with different sensor configurations.
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