Main characteristic parameters of current sensor:
1. Standard rating IPN and rated output current ISN
IPN refers to the standard rating that the current sensor can test, expressed as an effective value (Arms). The size of IPN depends on the model of the sensor product. ISN indicates the rated output current of the current sensor, which ranges from 10 to 400mA. The ISN may vary according to the model.
2, offset current ISO
Offset current is also called residual current or residual current, it is mainly caused by Hall components or electronic circuit operational amplifier working state instability. When the current sensor is in production, under the condition of 25℃ and IP=0, the offset current has been adjusted to the minimum. However, when the sensor leaves the production line, it will generate a certain amount of offset current. The accuracy mentioned in the product technical documentation takes into account the effect of increased offset current.
The linearity determines the degree to which the sensor output signal (secondary side current IS) IS proportional to the input signal (original side current IP) in the measurement range. The linearity of the current sensor of Nanjing Zhongxu Electronic Technology Co., LTD IS better than 0. 5%.
4. Temperature drift
The offset current ISO was calculated at 25 ° C and would change when the ambient temperature around the Hall electrode changed. Therefore, it is important to consider the maximum variation of the offset current ISO, where IOT refers to the temperature drift value in the current sensor performance table.
The overload capacity of the current sensor refers to the current overload, outside the measurement range, the original side current will still increase, and the duration of the overload current may be very short, and the overload value may exceed the allowable value of the sensor, the overload current value sensor generally can not be measured, but will not cause damage to the sensor.
The accuracy of the Hall effect sensor depends on the standard current rating IPN. At +25℃, the measurement accuracy of the sensor has a certain impact on the original side current. At the same time, the influence of offset current, linearity and temperature drift must be considered when evaluating the sensor accuracy.