Kako izbrati digitalni multimeter
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.
Videz
Dober digitalni multimeter lahko postane prijetna obrt, ki mora biti čim bolj popoln glede materialov, postopka brizganja, vezja, zaščitnih pokrovov in drugih komponent.
Preverite predmet
Po pridobitvi digitalnega multimetra:
Najprej morate preveriti, ali je ohišje v dobrem stanju, ali stikala in gumbi delujejo normalno in se počutijo dobro.
Ali je preklopno stikalo (izbira merilne funkcije) prilagodljivo pri vrtenju, primerno za dušenje, udobno v roki in ali je ustrezna merilna funkcija normalna.
Ali je LCD zaslon jasen, ali manjkajo poteze in digitalni skok naj bo čim manjši.
Ali se lahko oglasi brenčalo.
referenčni faktor
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).
Pri nakupu bodite pozorni tudi na nekatere podrobnosti, na primer, ali so varnostna zaščita, garancija izdelka, testni kabel, uporabniški priročnik ipd.
Testiranje zmogljivosti
Pri nakupu digitalnega multimetra lahko potrdite merilno funkcijo digitalnega multimetra z merjenjem sprejemljivosti znanih količin (kot so upor, kapacitivnost, napetost akumulatorja, izmenična napetost itd.).
