Txoj kev ntsuas qhov tsis kam nrog digital multimeter - ntsuas plaub-xaim ntxiv rau qhov ntsuas qhov tam sim no tsis tu ncua
Txoj kev ntsuas plaub-xaim tau hais los saum toj no tuaj yeem pab cov engineers ua kom tiav qhov kev ntsuas siab ua haujlwm siab multimeter. Txawm li cas los xij, hauv txoj kev ntsuas plaub-xaim, qhov tseeb ntawm qhov tam sim no qhov chaw tam sim no tseem ceeb heev. Nws raug nquahu kom siv cov khoom siv sab nraud kom ruaj khov tam sim no qhov chaw tam sim no.
Nws yuav tsum raug sau tseg tias qhov loj ntawm qhov siv qhov tam sim no qhov tam sim no yuav tsum sib npaug ntawm cov digital multimeter tas li tam sim no qhov tam sim no. Sab nraud qhov tam sim no qhov chaw tam sim no peb siv yog tsim los ntawm high-precision siv voltage qhov chaw MAX6250, ib qho kev ua hauj lwm amplifier thiab ib tug tam sim no-expanding composite raj, raws li qhia nyob rau hauv daim duab 2. Qhov kub drift ntawm qhov voltage qhov MAX6250 yog tsawg dua los yog sib npaug. mus rau 2ppm/degree, thiab lub sij hawm drift ΔVout/t=20ppm/1000h. Hauv cov txheej txheem ntsuas no, qhov tam sim no kuv yuav tsum yog 800μA ~ 1mA, R yog qhov tsis tshua muaj kub drift wirewound tsis kam (yog tias kuv=1}mA, R=5 kΩ), qhov kub thiab txias ntawm lub sij hawm drift ntawm kuv yog sib npaug rau qib MAX6250.
