Thaum xaiv lub ntsuas kub, ua qee yam ceev faj
kev ntsuas yuam kev
Thaum ua cov kev ntsuas siab-precision tiv thaiv, nws yog ib qho tseem ceeb kom ntseeg tau tias tus pas ntsuas kub tuaj yeem tshem tawm cov thermoelectric tej zaum yuav raug tsim los ntawm kev sib txuas hlau sib txawv hauv qhov ntsuas qhov system. Ib qho txheej txheem rau kev tshem tawm qhov yuam kev ntawm cov hluav taws xob hluav taws xob hluav taws xob yog siv hom hloov DC lossis tsawg zaus AC tam sim no.
daws lub zog
Ceev faj nrog qhov ntsuas no. Qee cov tuam txhab ntsuas ntsuas kub tsis sib haum xeeb thiab raug. Kev daws teeb meem ntawm {{0}}.001 degree C tsis tas txhais tau tias qhov raug ntawm 0.001 degree C. Feem ntau hais lus, tus pas ntsuas kub nrog qhov tseeb ntawm 0.001 degree C yuav tsum muaj qhov kev daws teeb meem tsawg kawg yog 0.001 ° C. Thaum kuaj pom qhov ntsuas kub me me, kev daws teeb meem yog qhov tseem ceeb - piv txwv li, thaum saib xyuas qhov nkhaus ntawm qhov chaw ruaj khov, lossis thaum kuaj xyuas qhov ruaj khov ntawm lub tank calibration.
Linearity
Cov tuam txhab ntsuas kub feem ntau muab qhov tseeb ntawm qhov ntsuas kub (feem ntau yog 0 degree C). Qhov no yog qhov tseem ceeb, tab sis feem ntau koj yuav tsum ntsuas qhov kub ntawm qhov dav, yog li nws yog ib qho tseem ceeb kom nkag siab qhov tseeb ntawm tus pas ntsuas kub hauv nws qhov chaw ua haujlwm. Yog hais tias lub linearity ntawm tus pas ntsuas kub yog zoo heev, ces nws qhov tseeb Performance index yog tib yam nyob rau hauv tag nrho nws cov kub ntau yam. Txawm li cas los xij, txhua tus pas ntsuas kub muaj qee qhov kev tsis sib xws thiab tsis yog linear tag nrho. Thov xyuas kom meej tias cov chaw tsim khoom muab cov cim qhia tseeb hauv qhov kev ua haujlwm, lossis muab cov ntsuas kev qhia ua haujlwm uas koj siv hauv kev suav tsis paub tseeb.
ruaj khov
Vim qhov xav tau los ntsuas ntau yam ntawm ib puag ncig thiab ntau lub sijhawm ntev, kev nyeem ntawv ruaj khov yog qhov tseem ceeb. Xyuas kom meej qhov ntsuas kub coefficient thiab lub sij hawm ntev stability. Xyuas kom meej tias qhov kev hloov ntawm ib puag ncig tsis cuam tshuam rau qhov tseeb ntawm tus pas ntsuas kub. Reputable manufacturers muab qhov ntsuas kub coefficient. Lub sijhawm ntev kev ruaj ntseg ntsuas qee zaum ua ke nrog cov ntsuas qhov tseeb - piv txwv li, "1ppm, 1 xyoo" lossis "0.01 degree C, 90 hnub". Nws yog ib qho nyuaj rau calibrate txhua 90 hnub, yog li nws yog ib qho tsim nyog los xam qhov ntsuas 1- xyoo thiab siv nws rau kev ntsuam xyuas tsis paub tseeb. Ceev faj ntawm cov chaw muab kev pabcuam uas muab "zero drift" ntsuas. Txhua tus pas ntsuas kub yuav muaj tsawg kawg yog ib qho kev cuam tshuam.
calibration
Qee qhov ntsuas kub tsis tas yuav rov ntsuas dua raws li kev qhia tshwj xeeb. Txawm li cas los xij, raws li qhov tseeb version ntawm ISO cov lus qhia, txhua yam khoom siv ntsuas yuav tsum tau ntsuas. Qee qhov ntsuas kub tau yooj yim dua rau recalibrate dua li lwm yam khoom siv. Txhawm rau siv tus pas ntsuas kub uas tuaj yeem ntsuas tau los ntawm nws lub vaj huam sib luag pem hauv ntej yam tsis tas yuav tsum muaj software tshwj xeeb. Qee lub ntsuas kub qub khaws cia cov ntaub ntawv ntsuas hauv EPROM nco thiab siv software kev cai rau kev ua haujlwm. Qhov no txhais tau hais tias tus pas ntsuas kub yuav tsum raug xa mus rau cov chaw tsim khoom kom rov ntsuas dua - tej zaum txawv teb chaws! Vim lub sij hawm thiab cov nqi koom nrog hauv kev rov ua kom rov zoo dua, nws yog ib qho tseem ceeb kom tsis txhob siv cov ntsuas kub uas tseem siv cov ntsuas ntsuas siab rau kev hloov kho. Feem ntau DC tus pas ntsuas kub ntsuas tau ntsuas siv cov txheej txheem DC tus qauv ruaj khov. Calibrating AC tus pas ntsuas kub lossis tus choj yog qhov nyuaj dua, yuav tsum muaj kev siv hluav taws xob siv hluav taws xob thiab qhov tseeb AC tus qauv resistor.
Traceability
Kev ntsuas traceability yog lwm lub tswv yim. Lub traceability ntawm DC tus pas ntsuas kub yog yooj yim heev los ntawm cov qauv zoo DC. Cov traceability ntawm kev sib txuas lus tus pas ntsuas kub thiab cov txuas hniav yog qhov nyuaj dua. Ntau lub teb chaws tseem tsis tau tsim kom muaj traceability ntawm AC tsis kam. Ntau lub teb chaws nrog cov qauv kev sib txuas lus sib txuas tau cia siab rau AC resistors calibrated los ntawm cov ntsuas kub los yog txuas hniav nrog qhov tsis paub meej qhov tseeb ntawm kaum lub sij hawm, uas ua rau kom qhov ntsuas tsis meej ntawm tus choj nws tus kheej.
