Bagaimana memilih multimeter digital
The accuracy of the digital multimeter directly affects the accuracy of the measurement results. When you get a digital multimeter, you should first analyze its accuracy technical indicators: one is to see if the accuracy of the meter can meet your requirements, and the second is to analyze the overall accuracy of the meter. For performance analysis, don't think that a 4-digit digital multimeter must have higher measurement accuracy than a 3.5-digit multimeter. The measurement accuracy of a 4.5-digit multimeter with rough craftsmanship may be better than that of a well-crafted 3.5-digit multimeter. The owner has encountered such a watch: a DT9103 4½-digit digital multimeter produced by an unknown small factory. During the measurement process, the numbers jumped very strongly, and it did not meet the requirements of the technical indicators.
Penampilan
Multimeter digital yang baik dapat menjadi kerajinan tangan yang menyenangkan, dan harus sesempurna mungkin dalam hal bahan, proses pencetakan injeksi, papan sirkuit, penutup pelindung dan komponen lainnya.
Periksa barang
Setelah mendapatkan multimeter digital:
Pertama-tama, Anda harus memeriksa apakah kasing dalam kondisi baik, apakah sakelar dan tombol berfungsi normal dan terasa baik.
Apakah sakelar sakelar (pemilihan fungsi pengukuran) fleksibel dalam rotasi, cocok untuk redaman, nyaman di tangan, dan apakah fungsi pengukuran yang sesuai normal.
Apakah layar LCD jernih, apakah ada goresan yang hilang, dan lompatan digital harus sekecil mungkin.
Apakah bel dapat berbunyi.
faktor referensi
If you can open the case, you can pay attention to the design of the circuit board, the selected components, installation and soldering level, etc. For a good digital multimeter, the design of the circuit board is very important. Some major manufacturers' watches will use a multi-layer circuit board layout to provide better shielding and electrical performance. The level of selected components determines the measurement accuracy of the digital multimeter. High-end digital multimeters often use SMD components to improve the accuracy and reduce the volume of the circuit board. The components in key parts are even screened. We won't talk much about the welding level, as all electronics enthusiasts know about it (when it comes to welding level, you can open a digital multimeter of more than ten yuan to see it, and the products of the workshop are guaranteed to make you feel terrible).
Saat membeli, Anda juga harus memperhatikan beberapa detail, seperti apakah perlindungan keselamatan, garansi produk, kabel uji, panduan pengguna, dll. lengkap.
Pengujian kinerja
Saat membeli multimeter digital, Anda dapat memastikan fungsi pengukuran multimeter digital dengan mengukur jumlah yang diketahui (seperti resistansi, kapasitansi, tegangan baterai, tegangan AC, dll.) yang diterima.
