Izinhlelo zokulinganisa amandla kagesi zibalulekile cishe kuzo zonke izimboni, ezentengiselwano nezohwebo.Njengoba amaseli omthwalo eyizingxenye ezibalulekile zesistimu yokulinganisa amandla, kufanele anembile futhi asebenze kahle ngaso sonke isikhathi.Ukuthi njengengxenye yokulungiswa okuhleliwe noma impendulo yokucisha ukusebenza, ukwazi ukuhlola alayisha iselikungasiza ukwenza izinqumo ezinolwazi mayelana nokulungisa noma ukushintsha izingxenye.
Kungani amaseli okulayisha ehluleka?
Amaseli okulayisha asebenza ngokulinganisa amandla asetshenziswa kuwo ngesignali kagesi ethunyelwa isuka kumthombo wamandla olawulwayo.Idivayisi yesistimu yokulawula, njenge-amplifier noma iyunithi yokulawula ukushuba, bese iguqula isignali ibe ivelu elifundeka kalula kusibonisi senkomba yedijithali.Kudingeka benze cishe kuyo yonke indawo, okungase ngezinye izikhathi kube nezinselelo eziningi ekusebenzeni kwabo.
Lezi zinselele zenza amaseli omthwalo athambekele ekuhlulekeni futhi, ngezinye izikhathi, angase ahlangabezane nezinkinga ezithinta ukusebenza kwawo.Uma kwenzeka ukwehluleka, kuwumqondo omuhle ukuhlola ubuqotho besistimu kuqala.Isibonelo, akuvamile ukuthi izikali zigcwaliswe ngomthamo.Ukwenza kanjalo kungakhubaza iseli lomthwalo futhi kubangele nokulayisha ukushaqeka.Ukwenyuka kwamandla kungase futhi kucekele phansi amaseli omthwalo, njenganoma yimuphi umswakama noma ukuchitheka kwamakhemikhali endaweni yokungena esikalini.
Izimpawu ezinokwethenjelwa zokuhluleka kwamaseli wokulayisha zihlanganisa:
Isikali/idivayisi ngeke isethwe kabusha noma ilinganise
Ukufundwa okungahambisani noma okungathembekile
Isisindo esingarekhodwe noma ukungezwani
Ukukhukhuleka okungahleliwe ngebhalansi enguziro
akazange afunde nhlobo
Layisha Ukuxazulula Inkinga Yeseli:
Uma isistimu yakho isebenza ngendlela engalungile, hlola noma yikuphi ukukhubazeka ngokomzimba.Qeda ezinye izimbangela ezisobala zokwehluleka kwesistimu - izintambo ezixhumene ezifayo, izintambo ezixegayo, ukufakwa noma ukuxhuma kumaphaneli akhombisa ukungezwani, njll.
Uma ukwehluleka kweseli lomthwalo kusenzeka, uchungechunge lwezinyathelo zokuxazulula inkinga kufanele lwenziwe.
Nge-DMM ethembekile, yekhwalithi ephezulu kanye okungenani negeji enamadijithi angu-4.5, uzokwazi ukuhlolela:
ibhalansi engu-zero
Ukumelana ne-insulation
ibhuloho ubuqotho
Uma imbangela yokwehluleka isitholakele, ithimba lakho linganquma ukuthi liqhubekela kanjani phambili.
Ibhalansi enguziro:
Ukuhlolwa kwebhalansi eyiziro kungasiza ekunqumeni ukuthi ingabe iseli lomthwalo liye lalimala yini ngokomzimba, njengokulayishwa ngokweqile, ukushaqeka, noma ukuguga kwensimbi noma ukukhathala.Qiniseka ukuthi iseli lomthwalo “alikho umthwalo” ngaphambi kokuqala.Uma ukufundwa kwebhalansi enguziro kukhonjisiwe, xhuma amatheminali okufakwa kweseli yomthwalo ku-excitation noma i-voltage yokufaka.Linganisa i-voltage nge-millivoltmeter.Hlukanisa ukufundwa ngokokufaka noma ngevolthi ye-excitation ukuze uthole ukufundwa kwebhalansi eyiziro ku-mV/V.Lokhu kufundwa kufanele kufane nesitifiketi sokuqala sokulinganisa iseli lomthwalo noma ishidi ledatha yomkhiqizo.Uma kungenjalo, iseli lomthwalo libi.
Ukumelana ne-insulation:
Ukumelana nokufakwa kukalwa phakathi kwesivikelo sekhebula kanye nesekhethi yeseli yomthwalo.Ngemva kokunqamula iseli yomthwalo ebhokisini lokuhlangana, xhuma wonke umkhondo ndawonye – okokufaka nokukhiphayo.Linganisa ukumelana nokufakwa kwe-insulation nge-megohmmeter, kala ukumelana nokufakwa kwe-insulation phakathi kwentambo yomthofu exhunyiwe kanye nomzimba weseli lomthwalo, bese kuba isivikelo sekhebula, futhi ekugcineni ukumelana nokufakwa phakathi kweseli lomthwalo wesivikelo nesihlangu sekhebula.Ukufundwa kokumelana nokushisisa kufanele kube ngu-5000 MΩ noma ngaphezulu kubhuloho-to-kesi, isihlangu sebhuloho-kuya-kwikhebula, nesihlangu sekesi-to-cable, ngokulandelanayo.Amanani aphansi abonisa ukuvuza okubangelwa umswakama noma ukugqwala kwamakhemikhali, futhi ukufundwa okuphansi kakhulu kuwuphawu oluqinisekile lokungena okufushane, hhayi umswakama.
I-Bridge Integrity:
Ubuqotho bebhuloho buhlola ukumelana nokufakwayo nokuphumayo kanye nezilinganiso nge-ohmmeter kupheya ngayinye yokufaka nemikhondo yokuphumayo.Usebenzisa izichasiselo zedatha yedatha, qhathanisa okokufaka nokuphikiswayo ukusuka “ku-negative okukhiphayo” kuye kokuthi “negative input”, kanye “negative okukhiphayo” kuya kokuthi “plus input”.Umehluko phakathi kwamanani amabili kufanele ube ngaphansi noma ulingane no-5 Ω.Uma kungenjalo, kungase kube nocingo oluphukile noma olufushane olubangelwa ukushaqeka, ukudlidliza, ukuhuzuka, noma amazinga okushisa aphezulu.
Ukumelana nomthelela:
Amaseli okulayisha kufanele axhunywe kumthombo wamandla ozinzile.Bese usebenzisa i-voltmeter, xhuma kumkhondo ophumayo noma amatheminali.Qaphela, phusha amaseli omthwalo noma ama-roller ukwethula umthwalo omncane wokuthuthumela, qaphela ukuthi ungafaki imithwalo eyeqile.Bheka ukuzinza kokufunda bese ubuyela ekufundweni kwebhalansi eyiziro yasekuqaleni.Uma ukufunda kungenangqondo, kungase kubonise ukuxhumeka kukagesi okuhlulekile noma ukuhamba kukagesi kungase kulimaze i-bondline phakathi kwe-strain gauge kanye nengxenye.
Isikhathi sokuthumela: May-24-2023
