Kho cov lus qhia rau Burnt Cheebtsam hauv Multimeter Resistance Range
Nws yog ib qho nyuaj rau kev ua hauj lwm ntau yam ntawm ib lub multimeter kom hlawv tawm vim qhov kev xaiv ntau yam tsis raug.
Noj R × 1 ntau yam ntawm U-10 multimeter ua piv txwv, nws qhov yooj yim Circuit Court yog qhia hauv daim duab 5-22.
Ntawm no, R5 yog qhov tsis kam zeroing potentiometer, R16 yog shunt resistor rau R × 1 ntau, thiab qhov nruab nrab tus nqi ntawm ohms rau qhov ntau yog 10 Ω. Qhov laj thawj tseem ceeb ntawm kev ua haujlwm tsis zoo yog kev siv tsis raug ntawm R × 1 iav los ntsuas lub zog hluav taws xob, ua rau hluav taws kub R16. Muaj ob txoj hauv kev los kho lub shunt resistor:
Thawj txoj kev: Siv ib lub manganese tooj liab hlau kwv yees li 1m ntev thiab 1-1mm inch thiab qhwv nws nyob ib ncig ntawm cov ntoo roj hmab. Thaum tsis muaj cov pob txha roj hmab, lub resistor nrog kaum ntawm k Ω thiab 1/2W kuj tuaj yeem siv los hloov. Siv lub tshuab ntsuas siab, xws li MF18 hom, ntsuas qhov tsis kam ntawm manganese tooj liab hlau. Xaiv ib ntu ntawm 40 Ω ± 0.4 Ω thiab qhwv nws nyob ib puag ncig ntawm cov roj hmab ntoo los yog cov resistor. Weld ob qho tib si ua ke thiab hloov lawv. Tau kawg, nws yog qhov zoo tshaj plaws los siv lub tshuab digital multimeter los yog choj los ntsuas qhov tsis kam ntawm manganese tooj liab hlau, uas yog qhov tseeb dua. Yog tias koj tsis muaj manganese tooj liab hlau ntawm tes, koj tuaj yeem hloov nws nrog cov hlau qhov txhab tiv thaiv los yog 20W khib nyiab soldering hlau tub ntxhais los ntawm kev tshem tawm cov cua sov. Tab sis qhov kub stability ntawm hluav taws xob cua sov xov hlau tsis zoo. Txhawm rau tiv thaiv luv luv ntawm kev sib hloov thaum lub sij hawm winding, xaim grooves tuaj yeem xa mus rau ntawm tus ncej rubberwood.
Qhov thib ob txoj kev yog siv ob 20 Ω, 1/4W hlau zaj duab xis resistors nyob rau hauv series li hloov rau R16. Qhov kev tiv thaiv yuam kev yuav tsum tsawg dua 1%.
