การสร้างเครื่องวัดสนามแม่เหล็กกระแสสลับอย่างง่ายสำหรับการเรียนการสอน.

An alternative electromagnetic field meter which consisted of 1) a probe made of an iron core, which is wrapped around by copper wire that is a function of receiving AC magnetic field signals, and 2) a display box having the function of taking signals from the probe to process with Node MCU and displaying the measuring results on a digital LED screen in a millitesla unit. The percentage error of measured results using the invented magnetometer are compared with ones obtained with the standard tesla meter. The efficiency of the magnetic field meter is considered for physics teaching management specialists. The results of study showed that the simple AC magnetic field meter invented here can measure and display the AC electromagnetic field from the coil. The results were close to those obtained from the standard meter. We found that the percentage error is not more than 6 % of the measured magnetic field in the range of 2.3-5.1 mT and in the frequency of 50 Hz, and that the level of quality of the invented meter is very good. [ABSTRACT FROM AUTHOR]