Inzwa yokucindezela 89448-34020 yezingxenye zezimoto zeToyota

1. Ukuxhumana okukude

Yamanje (4 kuya ku-20 mA) iyisixhumi esibonakalayo se-analog esithandwayo lapho sidlulisela ulwazi ngebanga elide. Lokhu kungenxa yokuthi ukuphuma kwamandla kagesi kulula kakhulu ekuphazamisekeni komsindo, futhi isignali ngokwayo izoncishiswa ukumelana nekhebula. Kodwa-ke, okukhiphayo kwamanje kungamelana namabanga amade futhi kunikeze ukufundwa kwengcindezi okuphelele nokunembayo kusuka kumthumeli kuya ohlelweni lokutholwa kwedatha.

2. Ukuqina kokuphazanyiswa kwe-RF

Izintambo zekhebula zisengozini yokuphazanyiswa yi-electromagnetic (EMI)/ radio frequency (RFI)/electrostatic (ESD) esuka kumakhebuli aseduze nemigqa. Lo msindo kagesi ongadingekile uzodala umonakalo omkhulu kumasignali aphezulu we-impedance njengamasignali kagesi. Le nkinga inganqotshwa kalula ngokusebenzisa i-impedance ephansi kanye nezimpawu zamanje eziphezulu, njenge-4-20 mA.

3, ukuxazulula inkinga

Isignali engu-4-20 mA inokukhipha okungu-4 mA futhi inani lokucindezela linguziro. Lokhu kusho ukuthi isiginali "inoziro obukhoma", ngakho-ke noma ukufundwa kwengcindezi kunguziro, izodla u-4 mA wamanje. Uma isignali yehlela ku-0 mA, lo msebenzi unganikeza umsebenzisi inkomba ecacile yephutha lokufunda noma ukulahlekelwa kwesignali. Lokhu akukwazi ukufezwa esimweni samasignali kagesi, ngokuvamile asukela ku-0-5 V noma ku-0-10 V, lapho okukhiphayo okungu-0 V kubonisa ingcindezi enguziro.

4. Ukuhlukaniswa kwesignali

Isiginali yokuphuma kwe-4-20 mA iyisiginali yamanje ye-impedance ephansi, futhi ukubeka phansi emikhawulweni yomibili (ukudlulisa nokwamukela) kungase kuholele ku-loop yaphansi, okuholela esignali engalungile. Ukuze ugweme lokhu, umugqa ngamunye wezinzwa we-4-20 mA kufanele uhlukaniswe kahle. Kodwa-ke, uma kuqhathaniswa nokukhishwa kwe-0-10 V, lokhu kuvimbela inzwa ukuthi iboshwe ngeketanga kungqalasizinda yekhebula eyodwa.

5. Ukuthola ukunemba

Uma udlulisela kusuka kunzwa yokucindezela, i-voltmeter ingakwazi ukuhumusha kalula isignali engu-0-10 V ekugcineni kokwamukela. Ngokukhishwa kwe-4-20 mA, isignali ingafundwa kuphela ngemva kokuba umamukeli eguqulelwe ku-voltage. Ukuze kuguqulwe lesi siginali ibe ukwehla kwamandla kagesi, i-resistor ixhunywe ngochungechunge kutheminali yokuphumayo. Ukunemba kwalesi siphikisa kubaluleke kakhulu ekulinganiseni ukunemba kwesiginali eyamukelwe.