Kev yuav khoom ntawm multimeter
Qhov tseeb, qauv, hom thiab kev txawj ntse ntawm digital multimeters txiav txim siab tus nqi sib txawv. Tus nqi ntawm digital multimeters tam sim no nyob rau hauv kev ua lag luam yog li ntawm ib lub kaum os mus txog kaum txhiab las.
Yog li ntawd, thaum koj yuav ib lub multimeter digital rau qhov koj xav ua, koj yuav tsum qhia meej koj cov kev xav tau ua ntej xaiv cov khoom: yog tias nws tsuas yog kev sim dav dav thiab cov kev cai rau kev ntsuas qhov tseeb tsis siab, ces xaiv tes pheej yig {{0 }} tuav digital multimeter. Txaus; Yog tias koj koom nrog kev ntsuas qhov tseeb, kho lossis muaj kev xav tau siab ntawm kev ruaj ntseg ntawm cov ntaub ntawv ntsuas, koj yuav tsum xaiv lub siab -kawg handheld digital multimeter lossis desktop digital multimeter.
Tej yam koj yuav tsum tau them sai sai rau thaum yuav khoom
A. Qhov tseeb Qhov tseeb ntawm digital multimeter ncaj qha cuam tshuam rau qhov tseeb ntawm qhov ntsuas ntsuas. Thaum koj tau txais digital multimeter, koj yuav tsum xub txheeb xyuas nws qhov tseeb kev ntsuas:
Ua ntej, saib seb qhov tseeb ntawm lub moos no tuaj yeem ua tau raws li koj xav tau;
The second is to analyze the overall performance of this watch. Don't think that a 4-digit digital multimeter must have higher measurement accuracy than a 3.5-digit multimeter. An excellent 3.5-digit digital multimeter, the owner has encountered such a watch: a DT9103 4.5-digit digital multimeter produced by an unknown small factory. During the measurement process, the digital beating is very strong, and it does not meet the requirements of the technical indicators.
B. Kev ceev faj 1. Kev tshwm sim
Ib qho zoo digital multimeter tuaj yeem dhau los ua cov khoom siv tes ua haujlwm zoo, thiab nws yuav tsum ua kom zoo tshaj plaws ntawm cov khoom siv, kev txhaj tshuaj molding txheej txheem, Circuit Court boards, tiv thaiv npog thiab lwm yam khoom.
2. Cov khoom tseem ceeb ntawm kev soj ntsuam Tom qab tau txais lub tshuab ntsuas digital:
Ua ntej ntawm tag nrho cov, koj yuav tsum xyuas seb cov ntaub ntawv nyob rau hauv zoo, seb lub keyboards thiab cov nyees khawm ua hauj lwm ib txwm thiab zoo. Txawm hais tias lub toggle hloov (kev ntsuas kev ua haujlwm xaiv) rotates flexibly, lub damping yog tsim nyog, txhais tes xis nyob, thiab seb qhov sib thooj ntsuas muaj nuj nqi. Txawm hais tias lub vijtsam LCD yog qhov tseeb, seb puas muaj cov hlab ntsha ploj lawm, thiab cov dhia digital yuav tsum tsawg li tsawg tau. Seb lub buzzer tuaj yeem suab.
3. Lwm yam kev siv
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 it. In addition, you should pay attention to some details when purchasing, such as whether the safety protection, product warranty, test cable, user manual, etc. are complete.
