Kuv cov kab mob SFRA tsis tuaj yeem rov ua dua. Yuav ua li cas mus tsis ncaj ncees lawm?
Tsis zoo SFRA repeatability yuav luag ib txwm tshwm sim los ntawm kev ntsuas teeb meem ntau dua li qhov teeb meem ntawm transformer tiag tiag.
|
yuam kev Source |
Cov tsos mob |
Keeb kwm |
Kho |
|
Cov av tsis zoo |
Suab nrov hauv cheeb tsam LF (< 100 Hz) |
Hauv av voj los yog ntab siv |
Txuas cov cuab yeej rau lub tank hauv av ncoo; zam txoj kev sib koom |
|
Cable txav |
Kev hloov pauv ntawm kev khiav |
Cable flex hloov capacitance |
Kev ruaj ntseg cables nrog daim kab xev; tsis txhob txav mus los thaum kuaj |
|
Qhib cov ntawv xeem |
Flat trace (tsis muaj peaks) |
Tshem tawm hauv coaxial conductor |
Tshawb xyuas txuas ntxiv nrog DMM ua ntej pib |
|
Kev sib txuas tsis raug |
Hloov peaks (tag nrho cov bands) |
Swapped txhaj / ntsuas chaw nres nkoj |
Daim ntawv lo kab; tib xim -coding txhua lub sijhawm |
|
Roj kub variation |
Gradual magnitude drift |
Copper expansion hloov geometry |
Cov ntaub ntawv temp; Sib piv tsuas yog cov kab hauv ± 5 degree |
|
Tseem tshuav magnetization |
Distorted tsawg-freq zoo |
Core saturation los ntawm kev xeem DC ua ntej |
Ua SFRA ua ntej kev xeem DC, lossis demagnetize cov tub ntxhais |
|
Ib puag ncig cuam tshuam |
50/60 Hz spikes nyob rau hauv qis band |
Cov khoom siv hluav taws xob nyob ze |
Kaw cov khoom uas nyob ib sab los yog siv lub tshuab lim |
Kev xyaum ua haujlwm zoo tshaj plaws rau kev rov ua dua SFRA:
1. Ua SFRA ua ntej txhua qhov kev ntsuam xyuas DC (IR, winding resistance) kom tsis txhob muaj cov core magnetization.
2. Sau cov roj kub thiab ambient tej yam kev mob.
3. Khaws tib txoj kab kev sib txuas thiab cov ntsiab lus sib txuas rau hauv paus thiab ua raws li - nce kev xeem.
4. Ua qhov "repeatability check" - coj ob qho tib si ntsuas yam tsis tau txav cables. Cov kab yuav tsum overlay zoo kawg nkaus.
5. Siv theem-rau- theem sib piv (xws li, H1-H2 vs. H2-H3) ua tus txheej txheem txhais lus tseem ceeb.