Kev xaiv ntau yam thiab ntsuas qhov yuam kev Analysis ntawm Multimeter Resistance
Noj MF{{0}}} multimeter ua piv txwv, qhov chaw nruab nrab ntawm Rxl0 thaiv yog 250Ω, qhov chaw nruab nrab ntawm Rxl00 thaiv yog 2.5kΩ, thiab qhov tseeb yog 2.5.
Siv R ×l 0 iav thiab R × 100 iav los ntsuas 500Ω tus qauv tsis kam, lub iav twg muaj qhov yuam kev loj dua?
1. R × l 0 thaiv: qhov siab tshaj qhov yuam kev △R(10)=central resistance ×R feem pua =250Ω×(±2.5) feem pua =± 6.25 Ω.
Ntsuas 500Ω tus qauv tsis kam, thiab tus nqi qhia ntawm 500Ω tus qauv tsis kam yog nyob nruab nrab ntawm 493.75Ω thiab 506.25Ω. Qhov siab tshaj qhov txheeb ze yuam kev yog: ± 6.25÷500Ω × 100 feem pua =± 1.25 feem pua.
2. R × l 00 iav: qhov siab tshaj plaws qhov yuam kev △R(100)= nruab nrab tsis kam × R feem pua 2.5kΩ × (± 2.5) feem pua =± 62.5Ω.
Ntsuas qhov 500Ω tus qauv tsis kam, thiab tus nqi qhia ntawm 500Ω tus qauv tsis kam yog nyob nruab nrab ntawm 437.5Ω thiab 562.5Ω. Qhov siab tshaj qhov txheeb ze yuam kev yog: ± 62.5÷500Ω × 100 feem pua =± 10.5 feem pua.
Kev txheeb xyuas qhov tshwm sim:
Yog tias koj xaiv qhov sib txawv ntawm qhov sib txawv, qhov ntsuas qhov yuam kev yuav txawv heev, yog li koj tuaj yeem txo qhov ntsuas qhov yuam kev li cas?
Thaum xaiv cov iav ntau yam, sim ua kom ntsuas qhov ntsuas qhov ntsuas nyob rau hauv nruab nrab ntawm qhov ntev arc ntawm qhov ntsuas qhov ntsuas los txhim kho qhov ntsuas qhov tseeb thiab txo qhov kev ntsuas qhov yuam kev.
multimeter hluav taws xob barrier
Qhov ntau yam ntawm kev tiv thaiv nyob rau hauv lub multimeter yog dav heev, thiab txhua qhov ntau tuaj yeem siv los ntsuas tus nqi tiv thaiv ntawm 0 mus rau ∞.
Cov qauv qhia ntawm qhov tseeb ntawm qhov hluav taws xob tsis kam ntawm multimeter: R feem pua =(△R/central resistance) × 100 feem pua.
Qhov ntsuas qhov ntsuas ntawm lub ohmmeter yog qhov tsis-linear thiab tsis sib npaug inverted scale, uas yog qhia raws li feem pua ntawm qhov ntev ntawm qhov ntsuas. Internal resistance ntawm txhua qhov sib npaug yog sib npaug rau qhov nruab nrab ntawm qhov ntev ntawm qhov ntsuas qhov sib npaug ntawm qhov loj, uas yog hu ua "center resistance".
Thaum qhov ntsuas tsis kam yog sib npaug rau qhov chaw tsis kam ntawm qhov kev xaiv, qhov tam sim no ntws hauv Circuit Court yog ib nrab ntawm qhov ntsuas tam sim no, thiab tus pointer qhia qhov nruab nrab ntawm qhov ntsuas.
Cov saum toj no yog cov kev xaiv ntawm cov hluav taws xob tiv thaiv ntau yam ntawm multimeter, thiab kev sib piv yuam kev thaum siv hluav taws xob tsis kam ntawm multimeter los ntsuas qhov tsis kam. Kuv vam tias nws yuav pab tau rau sawv daws.
