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Example of measurement of product's magnetic field distribution

Example of measurement of product's magnetic field distribution

 

(1) Goal

 Measure the magnetic field distribution of product's PCB, to check the influence of demagnetized components on the compass unit.

 

(2) Method

 Aichi receives a product from a user and measures using a magnetic field distribution device.

 If review is preferred before a product is made, a previous model of the product can be measured as a reference.

 

(3) Example results

 The example of measuring the magnetic field distribution of an iPhone circuit board is shown below.

 The parts shown in red in the picture have an influence on magnetic sensors. (Speakers and oscillating motors)

 

 If those areas are avoided, the area marked in green is a suitable mounting point.

 

 ※This only checks the magnetization of magnets and soft magnetic materials.

  It is important to avoid other noise-inducing causes when deciding where to mount the sensor.