RadiMation Application Note 104
How to determine the current sensor transfer impedance[edit]
The transfer impedance of a current sensor is important and required to perform accurate current measurements. A typical current sensor transfer impedance can be retrieved form the manufacturer of the current sensor, or it can be determined in a calibration laboratory. It is however also possible to determine the transfer impedance of a current sensor yourself, if you have the correct equipment.
This Application Note explains how measurements can be done in RadiMation® to determine the transfer impedance of a current sensor. These measurements are done by using the Attenuation/Gain calibrations as they are provided by RadiMation®. After the Attenuation/Gain calibration is performed, some calculations are needed to determine the correct transfer impedance, however these can easily be done in Microsoft Excel. A verification of the calibration and recalculation of the data can be done to ensure that the expected current is indeed correctly measured by RadiMation®.
Performing the Attenuation/Gain system calibration[edit]
Performing the Attenuation/Gain EUT calibration[edit]
Converting the determined to a transfer impedance[edit]
Specifying the transfer impedance for the current sensor device driver[edit]
Verification[edit]
After the transfer impedance of the current sensor is determined and attached, it is also possible to verify if RadiMation® is able to measure the expected current.