How to Calibrate Current Sensors for Maximum Accuracy

In order to effectively calibrate a current sensor, there are several basic steps to follow. The following are general steps that can be adjusted depending on the type of current sensor being used.

1. Confirm sensor specifications:
   Consult the sensor manual to confirm parameters such as range, output type (such as 4-20mA, 0-5V, digital signal, etc.), accuracy level, supply voltage, etc.
2. Prepare the test environment:
   Build a controllable test environment that matches the current sensor to be tested to minimize electrical noise that may affect calibration.
3. Select a standard current source:
   Use a standard current source that has passed the calibration test to output high-precision controllable current. For example, Hangzhi HZ601 series programmable DC standard source.
4. Select standard measurement equipment:
   Use a high-precision multimeter or oscilloscope as a measurement device. The measurement accuracy of the equipment must be higher than the nominal accuracy of the sensor.
5. Configure an appropriate amount of load resistance or load equipment:
   Loads may be required during the test, such as matching loads when the output is a current signal.
6. Safety measures:
   Make sure the circuit is disconnected to avoid high current overload or short circuit.
7. Calibration test:
   After preparation, the current sensor needs to be calibrated at zero point, full scale, linearity verification, temperature drift test, etc.
8. Record documents
   Record detailed calibration data, including: input current, output value, error, environmental conditions, etc.
   Generate a calibration report with calibration date, equipment number, calibrator, etc.