Sep 23, 2024 Tso lus

Yuav ua li cas txheeb xyuas RS485 teeb liab nrog Multimeter True RMS?

Txhawm rau txheeb xyuas RS485 teeb liab nrog True RMS Multimeter, ua raws cov kauj ruam no:

1. Paub meej txog kev xaim: Xyuas kom tseeb tias cov khoom siv A thiab B ntawm RS485 txuas nrog raug. A yog lub teeb liab tsis-inverting thiab B yog lub teeb liab inverting.

2. Xaiv hom kev ntsuas hluav taws xob: Teem lub multimeter rau DC voltage ntsuas hom, thiab qhov ntau yuav tsum tau teem rau tsawg kawg yog 5V lossis siab dua kom haum rau RS485 teeb liab voltage ntau yam (feem ntau yog -7V rau +12 V).

3. Ntsuas lub teeb liab kab voltage:

Txuas lub xov tooj liab ntawm multimeter mus rau kab A thiab qhov kev sojntsuam dub rau kab B.
Thaum lub sij hawm ib txwm RS485 teeb liab kev sib txuas lus, qhov sib txawv voltage ntawm kab A thiab B kab yuav tsum nyob nruab nrab ntawm +1.5V thiab +5V (logical siab theem) los yog nruab nrab ntawm -1.5V thiab { {6}}V (logical low level).

4. Tshawb xyuas cov teeb liab hloov pauv: Thaum sib txuas lus, qhov hluav taws xob ntawm A thiab B yuav tsum hloov pauv nrog cov ntaub ntawv xa mus. Yog tias qhov hluav taws xob tseem tsis hloov pauv, nws yuav qhia tau tias kab teeb liab tsis xa cov ntaub ntawv lossis lub cuab yeej ua haujlwm tsis zoo.

5. Kev daws teeb meem:

Yog tias qhov hluav taws xob tawm ntawm qhov ib txwm muaj lossis tsis muaj qhov hloov pauv, xyuas seb cov kab txuas puas yog xoob, seb lub davhlau ya nyob twg tsis sib haum, lossis seb lub cuab yeej puas ua haujlwm zoo.

Txoj kev no tuaj yeem txiav txim siab seb lub teeb liab puas muaj los ntawm qhov sib txawv ntawm qhov sib txawv ntawm RS485, tab sis nws tsis tuaj yeem ntsuas qhov tshwj xeeb waveform ntawm lub teeb liab. Yuav kom tau txais cov lus qhia ntxaws ntxiv, nws raug nquahu kom siv oscilloscope.

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