Txhawm rau txheeb xyuas qhov tseeb ntawm lub teeb liab qhov tseeb ntawm qhov analog tso zis module tom qab calibration, nws yog ib qho tsim nyog yuav tsum tau ua ntau- taw tes ntsuas, siv siab - ntsuas ntsuas qhov tseeb, thiab ua qhov system- kev txheeb xyuas qib txuas. Qhov no ua kom ntseeg tau tias cov txiaj ntsig tso tawm thoob plaws tag nrho tag nrho - nplai ntau ua raws li cov qauv tsim kom haum (feem ntau Tsawg dua lossis sib npaug rau ± 1% ntawm tag nrho cov nplai).
I. Txoj Kev Tshawb Fawb Tseem Ceeb: Ntau -Point Measurement
Txhawm rau ntsuas qhov ua tau zoo ntawm qhov ntsuas ntsuas, cov teeb liab tso zis yuav tsum raug kuaj ib tus zuj zus ntawm tsib lub ntsiab lus tseem ceeb: 0%, 25%, 50%, 75%, thiab 100%. Qhov no tso cai rau kev ntsuam xyuas ntawm ob qho tib si linearity thiab repeatability.
|
Teeb Point |
Qhov Zoo Tshaj Tawm Tus Nqi (4-20 mA) |
Tso cai yuam kev ntau yam (± 1%) |
Kev pom zoo ntsuas |
|
0% |
4.00 mA |
3.96–4.04 mA |
Sau xoom-point drift |
|
25% |
8.00 mA |
7.92–8.08 mA |
Tshawb xyuas qhov tsis yog -linearity sib txawv |
|
50% |
12.00 mA Nws |
11.88–12.12 mA |
Txheeb xyuas qhov nruab nrab - qhov ruaj khov |
|
75% |
16.00 mA Nws |
15.84–16.16 mA |
Saib xyuas qhov sib npaug |
|
100% |
20.00 mA |
19.80–20.20 mA |
Paub meej tias tsis muaj saturation ntawm tag nrho cov nplai |
Cov kauj ruam ua haujlwm:
1. Sequentially sau cov txiaj ntsig digital (piv txwv li, 0, 8192, 16384, 24576, 32768) rau hauv PLC program.
2. Siv tus lej 6½-digit digital multimeter txuas nrog hauv koob los ntsuas qhov tseeb tam sim no.
3. Sib piv cov nqi ntsuas tawm tsam cov txiaj ntsig zoo; Yog hais tias qhov sib txawv tshaj ± 1%, recalibration los yog ua kom cov software them nyiaj yuav tsum tau.
II. Pom zoo siab -Cov cuab yeej ntsuas qhov tseeb
Kev siv cov cuab yeej siv nrog qhov tseeb qhov ntsuas ib qib siab dua li ntawm cov cuab yeej hauv kev sim yog qhov yuav tsum tau ua ua ntej kom ntseeg tau qhov kev ntseeg siab ntawm cov txheej txheem pov thawj. Cov cuab yeej pom zoo:
Fluke 8846A: DC tam sim no ntsuas qhov tseeb txog ± 0.02%, txhawb μA- theem kev daws teeb meem.
Keysight 34461A: 6½-digit digital multimeter featuring a auto-calibration function, haum rau cov chaw kuaj mob.
Handheld Signal Calibrator (piv txwv li, RSG-3000): Muaj peev xwm ntawm kev tso tawm ib txhij thiab ntsuas 4-20 mA cov cim, ua kom yooj yim rau kev ua haujlwm.
Nco tseg: Thaum lub sij hawm ntsuas, xyuas kom meej tias qhov ntsuas tau dhau los kuaj xyuas metrological kom tsis txhob qhia txog qhov ua yuam kev.
III. System-Kev Ntsuas Ntsuas Ntsuas Ntsuas (Closed-Kev Ntsuas Ntsuas)
Kev ntsuas hluav taws xob ib leeg tsis txaus los cuam tshuam txog kev tswj xyuas qhov tseeb; kev ua haujlwm raug kaw-Loop pov thawj cuam tshuam nrog cov actuators downstream kuj tseem xav tau.
Hom Scenario Verification Methods:
Tswj Variable Frequency Drive (VFD) Ceev
Teem lub PLC tso zis rau 12 mA (50% zaus).
Saib xyuas seb VFD ua haujlwm ruaj khov ntawm 50% ntawm nws qhov ntsuas zaus.
Siv lub tachometer los ntsuas qhov tseeb lub cev muaj zog ceev; qhov sib txawv yuav tsum yog<±2%.
Kho qhov sib npaug ntawm qhov qhib qhib
Tso zis 8 mA (25% teeb liab) los tsav lub proportional valve.
Siv lub ntsuas ntsuas dej los xyuas seb qhov nruab nrab ntws npaum li cas mus txog qhov kev faib ua feem.
Yog tias tsis pom cov lus teb tsis yog-linear, ntxiv ib qho kev saib xyuas cov lus them nyiaj niaj hnub rau qhov kev zov me nyuam.
Temperature Control System Teb
Siv analog tso zis los tswj lub tshuab cua sov.
Saib xyuas qhov ntsuas kub tswj cov lus tawm tswv yim kom paub tseeb tias qhov ntsuas kub nce linearly teb rau lub teeb liab.
Siv TIA Portal daim ntawv qhia kev ua haujlwm los sau thiab txheeb xyuas qhov sib xws ntawm cov tswv yim / tso zis nkhaus.
Xaus: Cov teeb liab raug tsis yog hais txog "tus lej precision," tab sis qhov tseem ceeb tshaj, txog kev ua kom "yuav tau tswj tau."
IV. Ntev -Lub Sij Hawm Stability thiab Temperature Drift Test
Txhawm rau kom lub neej ntev ntawm cov nyhuv calibration, kev soj ntsuam tas li nyob rau hauv ntau yam kev ua haujlwm raug pom zoo.
Luv -Tsev Kawm Ntawv: Ua haujlwm tsis tu ncua rau 2 teev, sau cov nqi tso tawm txhua 15 feeb los soj ntsuam rau txhua qhov kev sib tw.
Temperature Cycling Test: Ua kev ntsuam xyuas ntawm 15 degree, 25 degree, thiab 40℃ib puag ncig, ntsig txog, txhawm rau txheeb xyuas qhov ntsuas kub nyob hauv qhov kev tso cai (piv txwv li,<0.05%/°C).
Fais fab -Cycle Verification: Fais fab tuag lub system rau 10 feeb, ces lub hwj chim rov qab mus rau kom paub meej tias tus nqi tso zis rov qab mus rau lub calibrated lub xeev thiab hais tias tsis muaj tsis tau ploj. Cov ntsiab lus tseem ceeb: Calibration tsis yuav tsum tau muab cia rau hauv EEPROM lossis Flash nco thiab tiv thaiv los ntawm CRC validation los tiv thaiv kev noj nyiaj txiag, yog li xyuas kom meej tias cov ntaub ntawv tsis poob thaum lub hwj chim tsis ua hauj lwm.
