Kev daws teeb meem rau CMRR tsis txaus hauv Cov Txheej Txheem Kub Kub

Xaiv cov CMRR kub tswj modules, txhim kho cov teeb liab kab thaiv thiab hauv av, muab lub zog cais tawm hauv qhov chaw, thiab ua haujlwm niaj hnub tiv thaiv - cuam tshuam kev txheeb xyuas yog qee txoj hauv kev los daws qhov tsis txaus CMRR hauv cov tshuab kub khiav. Cov kev txhim kho ntau yam no, uas muaj ntau yam los ntawm kev tsim qauv mus rau ntawm - qhov chaw tu, ntxiv dag zog rau kev tiv thaiv - muaj peev xwm cuam tshuam thiab lav qhov tseeb thiab txhim khu kev qha ntsuas kub.

 

1. Hloov Kho Cov Txheej Txheem Tseem Ceeb (Core Control Module)

Xaiv lub ntsuas kub nrog CMRR siab: Hloov nws tawm rau kev lag luam -qib PID module nrog CMRR yam tsawg kawg nkaus 80dB. Xaiv lub ntsuas kub digital nrog CMRR> 100dB rau siab -kawg daim ntawv thov.

Omega CN7800 series thiab Eurotherm 2408 yog cov npe pom zoo vim tias lawv muaj cov suab nrov txo algorithms thiab EMC ntawv pov thawj.

Qhib Digital Filtering: Txhawm rau txo qhov siab - lub suab nrov nrov cuam tshuam, tig rau qis- dhau kev lim dej (piv txwv li, 1 ~ 5Hz) hauv qhov ntsuas qhov ntsuas kub.

Tus nqi tsim nyog: Los ntawm kev hloov kho nws qhov ntsuas kub ntawm CMRR 60dB txog 100dB, lub tsheb txhaj tshuaj molding cog tuaj yeem txo qhov kub ntawm qhov sib txawv ntawm ± 12℃mus rau ± 1.8℃thiab nce cov khoom pov thawj tus nqi los ntawm 9.3%.

 

2. Kev Tshaj Tawm Txoj Kev Tshaj Tawm (Key Cabling Measures)

Xam cov ntsiab lus ua haujlwm

Siv Shielded Twisted Pair Cable: Yuav kom txo qis electromagnetic coupling, cov kab hluav taws xob thermocouple yuav tsum muaj ib khub twisted ntxiv rau cov qauv hlau thaiv.

Ib qho -Point Grounding: Txhawm rau tiv thaiv cov voj voog hauv av uas ua rau lub suab nrov, cov txheej thaiv thaiv tsuas yog hauv av ntawm qhov ntsuas kub kawg nkaus xwb.

Nyob deb ntawm High-Voltage Cables: Khaws qhov tsawg kawg nkaus ntawm 30 cm ntawm cov kab teeb liab thiab lub cev muaj zog lossis lub tshuab hluav taws xob hluav taws xob; hla perpendicularly.

qis Cable Length: Kom txo qis "antenna effect" suab nrov, txo qhov ntev ntawm lub teeb liab cable.

Nws raug nquahu kom txuas lub oscilloscope nyob rau hauv qhov sib npaug rau cov thermocouple input rau ntawm - qhov chaw kuaj. Tiv thaiv los yog hauv av tsis ua hauj lwm yog qhia yog tias 50/60Hz spikes pom.

 

3. Muab Fais Fab Kev rho tawm thiab lim (System-Kev Tiv Thaiv Qib) rau hauv kev xyaum

Ntxiv AC Isolation Transformer: Txhawm rau kom tsis txhob muaj - hom kab hluav taws xob sib txawv, teeb tsa lub tshuab hloov pauv sib txawv rau qhov kub khiav kub tswj txee.

Siv DC-DC Isolation Module: Txhawm rau tiv thaiv ntau- hom tam sim no, nruab ib qho DC cais tawm -DC converter ntawm qhov ntsuas kub tswj module lub hauv ntej kawg.

Nruab EMI Lub Hwj Chim Lub Zog: Txhawm rau txo qhov siab - lub suab nrov zaus, nruab ib lub lim dej ntawm lub qhov hluav taws xob loj.

Independent Power Supply Circuit: Steer clear of connecting high -power devices (xws li lub tshuab txhaj tshuaj molding lub ntsiab lub cev muaj zog) rau tib theem kab.

Txoj Cai Kev Nyab Xeeb: "High CMRR module + shielded thaiv + fais fab sib cais" triple tiv thaiv yog qhov tseem ceeb.

 

4. Kev saib xyuas thiab ntsuas kev ua tau zoo

Txhua lub hlis twg, xyuas cov kab txuas txuas rau oxidation thiab nruj.

Saib rau siab -frequency spikes ntawm lub thermocouple input terminals siv lub oscilloscope.

Ntiav tus neeg thib peb los ua qhov kev xeem CMRR thiab ntawv pov thawj tom qab cov khoom siv kho dua tshiab lossis hloov cov tswj ntsuas kub.

Tsim cov ntaub ntawv tswj qhov kub thiab txias los sau cov xwm txheej cuam tshuam thiab kho kom raug. Tus nqi lus pom zoo: Ib qho kev tiv thaiv kev cuam tshuam ib leeg tuaj yeem nres ib pawg ntawm cov khoom tsis raug pov tseg vim qhov kub thiab txias (ib qho poob feem ntau tshaj 10,000 yuan).