Hall current sensor verification, reconnect the line, the measurement results are different, what is

Hello upstairs brother, this passage of yours looks so familiar.

1. Change of current sensor.

2. The size of the measured current.

3. The tested cable or bronze plate is too small, and the aperture of the sensor is too large, and the proportion is not coordinated.

If the above has not changed, then you have to re-read these in the brush, the general sensor measurement results will be a little different, almost the same, we recommend that the measured conductor try to fill the perforation of the sensor, which is conducive to the detection of the sensor, if your wire is too thin, the hole of the sensor is large, so that even if you move the sensor, the output signal will change, which is a normal phenomenon.

I also make current sensors, I hope to have the opportunity to communicate more, I have the ** and instructions of these products in my space, you can take a look, contact me if you have any questions.

When using Hall sensors, especially during verification, in order to exert their nominal accuracy, it is necessary to pay attention to the primary wiring method:

Use a copper rod or copper bar to pass through a hole, a copper bar is used for a square hole, a copper rod is used for a round hole or a hexagonal hole, and it is best to fill the entire hole diameter with a core conductor.

If it is difficult to do the above, at least do it, and the connecting wire passes through only one turn, through the center of the hole.

Do not have strong electromagnetic fields nearby.

Hello landlord, there are many types of current sensors, divided into Hall principle and mutual inductance principle, the domestic name is not the same, for your problem can not determine the specific problem, so I will give you all the overload capacity of these principles.

1. The output of the Hall sensor used for speed measurement is similar to that of a square wave, and the period of the square wave becomes larger and smaller with the speed of rotation. Therefore, the processing circuit only needs to be compared simply, and there is no need to add a holding circuit.

2. Compared with ordinary mechanical quantities, the response speed of Hall sensor is very fast, and the response speed of voltage comparison circuit is also very fast. A 12,000 rpm motor, a 50-tooth gear, and a Hall sensor output a pulse frequency of only 10 kHz. The 51 series microcontroller uses a 6MHz clock when a machine cycle is only 2 microseconds, and it is a piece of cake to receive and process 10kHz pulses.

3. The bidirectional limiting output circuit of the hysteresis comparator helps to achieve accurate comparison, which can be omitted in this speed measurement application.

If you go very slowly, the speed that triggers the rotation of the blades will also be slower, and the time for both high and low potentials will be longer. It's not a sharp pulse, it's just low and high, but there's a gradient from low to high from the moment the blade starts to block the magnetic field lines to the time it completely blocks the magnetic field lines.

The Hall sensor detects the strength of the magnetic field and outputs the voltage;

Electric current can generate a magnetic field, so Hall sensors can indirectly detect current;

A voltage is applied to a winding (coil) with constant impedance, and its current is proportional to the voltage, and the strength of the magnetic field is also proportional to the voltage, so the Hall sensor can also indirectly detect the voltage.

Hall sensors detect changes in the strength of the magnetic field.

The current sensor has a voltage output when you turn on the power and measure the signal at the output, because the zero point cannot be completely zero, for example

That's itjkc1iFor example, the current sensor does not consider what the range is, the output signal is 4V, you turn on the power, look at the output signal, there will be several MV output, all sensors are like this, even if you look at the zero, it is only a matter of decimal places, and there is a situation, tojkc39iFor example, the current sensor is not considered what the range is, the output signal is, you turn on the power supply, look at the output signal, there will be a few or so outputs, such a sensor is the current is zero when the corresponding output signal is.

JKC1i Current Sensor Parameters.

JKC39i Current Sensor Parameters.

.There is no voltage at the output when there is no current.