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Precautions for High-Precision Measurement of Current Sensors

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Update time : 2022-02-10 09:33:07
The current sensor, also known as the magnetic sensor, is a detection device that can complete the induction of the measured current information and output it as the required form of information. It has the characteristics of high sensitivity and strong anti-interference. It has been widely used in EVs, smart grids, medical equipment and other facilities.
 
There are various detection methods of current sensors, but most of them use coiled wires to detect the magnetoelectric conversion elements and magnetic cores inserted into the magnetic flux according to the current flow in the measured conductor.
 
In order to perform high-precision current measurement, the rated value of the current sensor and the measurement bandwidth should be appropriate. It is necessary to select a rated current sensor suitable for the current range of the measurement object. The current sensor uses the true RMS value to specify the rated current, but many current sensors use peak-gauge current for rated current which needs to be paid attention to. In addition, whether the measurement bandwidth of the current sensor can cover all the frequencies of the measurement object also needs to be confirmed. Let's take a look at the precautions for high-accuracy current measurement with current sensors here.
 
1. Put the measuring conductor in the center position
Regardless of the current sensor, the influence of the conductor position exists, and the amount of influence tends to increase with the measurement frequency. Even for a feed-through current sensor with good characteristics, at high frequencies above 10 kHz, the influence will also be If it becomes very large, the accuracy specified by the manufacturer of the current sensor must be specified at the center position of the current sensor, especially in the case of measuring high-frequency current, to perform high-precision and high-stability measurement, it is best to consider placing the measurement conductor in the hob. The current sensor is located in the center of the current sensor.
 
2. Range and maximum measurement capability, power consumption, supply voltage
The range of the sensor refers to the rated measurement current. When the value of the load resistance and the supply voltage meet the requirements, the sensor can have the full-scale measurement capability under any normal operating temperature and other conditions. The achievable measurement capability and the maximum measurement capability of the sensor refer to the absolute maximum capability that can be achieved under ideal conditions within a limited time. The maximum measurement capability may be limited by the capacity of the internal power tube, which can only be used for a short period of time. Very short time pulse current measurement is not limited by the maximum measurement capacity.
 
3. No adjacent conductors near the current sensor
In order to perform high-precision current measurement, the adjacent conductors should be kept away from the current sensor as far as possible, especially the influence of high-frequency current is greater, and the influence of surrounding current must be considered when performing high-precision current measurement.
 
4. Take the lowest supply voltage that meets the maximum measurement capability as much as possible
The power consumption in the sensor is mainly the consumption of the internal coil and the power tube. The consumption of the power tube will generate heat, resulting in a temperature rise. In extreme cases, the power tube may be overheated, resulting in reduced lifespan or even overheating damage. In order to avoid wasting energy, reducing power and increasing the burden on the power tube, the lowest power supply voltage that satisfies the maximum measurement capability should be taken as much as possible, especially when the sensor works in a high temperature environment.
 
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