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Performance Comparison of Fluxgate and Hall Current Sensors

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Update time : 2021-09-08 12:01:49
Compared with Hall sensors, fluxgate current sensors have the advantages of high precision, wide bandwidth, low temperature drift, low zero drift, and full range. Comparison between HANGZHI fluxgate current sensor IIT200 and LF205-S based on the Hall principle will be conducted below.
 
1. Measuring accuracy
HANGZHI IIT sensor has an accuracy of 0.02% stated as the specification under the rated 200A range, and the actual measured accuracy is within one ten thousandth; moreover, it can also reach 0.02% even under 10% of the rated range.
The LF205-S sensor has an accuracy of 0.5% under the rated 200A range, and the error is even greater at a current of 20A.
 
Testing method:
The current pass through the primary side of the sensor, and the output current of the sensor is recorded at the same time. With the current decreasing, the accuracy analysis is performed based on the recorded current value of the current output port.


 
2. Zero point with power on
The zero point of HANGZHI IIT200 current sensor is fixed every time it is powered on, but the zero point of the Hall sensor is not fixed every time it is powered on. An unfixed zero point will cause the deviation of each measurement value to be different, and it cannot be corrected by software calibration.
 
Testing method:
The current output terminal of the current sensor can be connected to a fixed resistor (such as 20 ohms), and a six-and-a-half multimeter (KEYSIGHT 34461A) can be used to measure the voltage across the resistor to judge. Each time the sensor is powered off and then powered, read the voltage value measured by the six and a half digits multimeter.
 
3. Temperature Drift
HANGZHI IIT200 current sensor is designed with fluxgate technology, and temperature control compensation technology is sampled in the design. When the working outside temperature changes from -40 to 85 degrees, the output accuracy of the sensor is not affected by temperature. LF205S sensor adopts Hall chip design, which is easily affected by the external environment temperature.
 
Testing method:
The current output terminal can be connected to a fixed resistor (such as 20 ohms), and a six-and-a-half-digit multimeter (KEYSIGHT 34461A) can be used to measure the voltage across the resistor to judge. The current sensor is placed in the high and low temperature box, the working environment temperature of the sensor is changed by the high and low temperature box, and the voltage value measured on the six and a half digit multimeter when the outside temperature changes.
 
4. Measuring aperture
The aperture of HANGZHI IIT200 sensor is 26mm which is more conducive to threading, while LF205S sensor aperture is 15.6mm.
 
5. Position measuring current line passing
The measuring accuracy of HANGZHI current sensor is not affected by the threading position. Whether it is passing through the center or close to the sensor hole wall, the output value of the sensor measurement signal remains unchanged, and the measuring accuracy is not affected.
The measuring accuracy of the LF205S sensor is greatly affected by the threading position, and the output measurement value changes with the change of the threading position. Passing through the center of the sensor and passing through the side of the sensor, there is an error in the output signal value.
 
Testing method:
The current output terminal can be connected to a fixed resistor (such as 20 ohms), and a six-and-a-half-digit multimeter (KEYSIGHT 34461A) can be used to measure the voltage across the resistor. Pass the measured current line through the sensor, change the position where the measured current line passes through the sensor, and observe whether the voltage value measured on the six-and-a-half digit multimeter changes when the measured current line passes through the sensor at different positions.
 
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