Sedikit pengetahuan tentang ammeter AC digital
Ammeter AC adalah generasi baru instrumen cerdas yang dapat diprogram. Ini mengadopsi sirkuit terintegrasi berskala besar dan tampilan LED dengan kecerahan tinggi dan tahan lama, dan menerapkan teknologi pengambilan sampel digital untuk mengukur tegangan fase, tegangan saluran, arus fase, arus saluran, daya aktif Tampilan pengukuran waktu nyata dan kontrol daya, daya reaktif, daya semu, frekuensi, faktor daya, energi aktif, energi reaktif, dan energi empat kuadran.
The AC ammeter mainly adopts the measuring mechanism of the electromagnetic system ammeter, the electric system ammeter and the rectifier type ammeter. The low range of the measuring mechanism of the electromagnetic system is about tens of milliamperes. In order to increase the range, the number of coil turns should be reduced proportionally and the wire should be thickened. When the ammeter is composed of an electric system measuring mechanism, the moving coil and the static coil are connected in parallel, and its low range is about tens of milliamperes. In order to increase the range, the number of turns of the static coil should be reduced, and the wire should be thickened, or the two static coils should be connected in parallel instead of series, then the range of the ammeter will be doubled. When measuring AC current with a rectifier ammeter, the ammeter reading is correct only when the AC is a sine wave. A shunt can also be used to expand the measuring range. In addition, high-frequency currents can also be measured with thermoelectric meters. Most of the large-range AC ammeters used in power systems are 5A or 1A electromagnetic ammeters, and are equipped with current transformers with appropriate current transformation ratios.
Perbedaan antara DC dan AC
Ammeter DC dan ammeter AC sangat berbeda, dan pengukuran tidak dapat dipertukarkan, dan tidak ada cara untuk bertukar pengukuran. Untuk ammeter arus tinggi, ammeter DC sebenarnya hanya voltmeter DC 75 milivolt (yang mengukur milivolt pada shunt. volt), dan resistansi internal ammeter AC sangat kecil (pengukurannya adalah arus hubung singkat arus sekunder transformator), yang merupakan hubung singkat untuk rangkaian, dan arus dapat mengalirkan arus AC 5 ampere.
