[Marco] Ujonge iimitha ezininzi.Nangona kunjalo, ucinga ukuba i-HP3458A iyona nto ingcono kakhulu, nangona yaziswa ngaphezu kweminyaka engama-30 edlulileyo kwi-1989. Umntu othile wanikela enye [kuMarco], kodwa yabonisa imilayezo ethile yephutha kwaye yabonisa ukuziphatha okungazinzanga xa iqala, ngoko wayefuna ukulungiswa okuthile.
Ngokuka [Marco], ikhowudi yempazamo ibonisa ingxaki nge-multi-slope analog-to-digital converter, nto leyo eyenza imitha yodwa.Umitha unamanani angama-8.5, ngoko ke isigaba esiqhelekileyo sokuguqulwa asiyi kunqumla.
Iindaba ezimnandi ngalo mbandela zezokuba usinika isizathu sokujonga ngaphakathi ebhokisini.Yonke ibhodi yomama ngaphakathi ibonakala intsonkothile njengebhodi yePC yangoku.Ngaphakathi kolu luhlu lokuchaneka, ibhodi yesekethe ihlanganiswe kwi-customized high-performance resistor network.
Indlela eqhelekileyo yokuguqula i-voltage kwinani isebenzisa ixesha elifunekayo ukuhlawula kunye nokukhupha i-capacitor, kwaye ixesha elifunekayo limele i-voltage.Imitha isebenzisa izixhasi ezininzi ezinokuthi zenzeke kwithambeka, [uMarco] uchaza indlela imitha esebenzisa ngayo ithambeka elikhawulezayo nelincinci ukufumana ufundo olurhabaxa, kwaye emva koko isebenzisa ithambeka elicothayo nelichanekileyo ukucokisa amanani asezantsi.
I-chip yesiko ine-IC kunye nenethiwekhi ye-resistor yesiko.Ukuba iyasilela, imitha ayifane ilungiswe ngaphandle kokuya kwiziko lenkonzo yomzi-mveliso ukuze kuthengwe ibhodi yesekethe entsha malunga ne-3,000 yeedola.I-chip yesiko ibonakala isebenza ngokufanelekileyo, kwaye ukubuyisela umthelekisi owaziwayo ngokusilela akuncedi.
Yintoni elandelayo?Thenga zonke iindawo onokuzifumana kwibhodi yesekethe (malunga ne-100 yeedola), uze utshintshe zonke iindawo.Siyayithanda indlela yakhe yokususa icandelo elingafunekiyo likhokelela ngexesha lenkqubo yokwakhiwa kwakhona.Ekuqaleni, oku kwakubonakala kusenzeka, kodwa ukuzilinganisa akuzange kuphumelele.Kubonakala ngathi i-IC yesiko inokuba yaphukile, ngoko ke ekugqibeleni wayitshintsha yonke ibhodi yokuguqula.
Oku kwacima eyona mpazamo inkulu, kodwa eminye imilinganiselo iseneengxaki, ibangela ukuba enye ibhodi ilungiswe.Isekethe echaphazelekayo yenza ukuguqulwa kwe-RMS kwiimpawu ze-AC.Imitha ineendlela ezahlukeneyo zokulinganisa i-RMS.
Le vidiyo libali elihle lomphenyi, kwaye uya kufunda okuninzi malunga neemitha ezinesisombululo esiphezulu.Xa yonke into iqhelekile, siya kubona izinto ezingaqhelekanga, ezinjengeentambo ezisebenza njenge-capacitors kunye nabalandeli abanomsindo.
Ndakha ndasebenza nonjineli owayila i-analog.Uthe lo ngumzamo omkhulu, kwaye benze umsebenzi omninzi kunokuba bebelindele.Ukholelwa ukuba le nxalenye yesizathu sokuba kutheni i-HP / Agilent / Keysight iqalile kodwa ayizange igqibe inguqulo yokuphucula.Kuphela iFluke ine-DMM ethelekisayo, kwaye kunokuthiwa i-3458 iseyona nto ingcono kakhulu.Kunzima kakhulu ukuvelisa iimveliso ezingcono ngobuninzi.
Omnye umntu undixelele ukuba i-AVO8 yeyona multimeter ingcono enokuthengwa yimali.Ikrolwe etyeni, awathi uMoses wehla entabeni ngexesha loloyiso.Kucacile ukuba bendilahlekisiwe.
Ekubeni i-AVO8 ayiqhelekanga kweli cala lechibi, ndiye ndafumanisa ukuba oku kukufunda okunomdla… http://www.richardsradios.co.uk/avo8.html
Ndirhalela i-AVO 8 xa ndandikwishumi elivisayo, kodwa amaxabiso azo ayengaphaya kwamandla am.Kwiminyaka engama-40 kamva, ndinoMk II kwibhentshi yam.Kwimeko engaqhelekanga apho ndisebenza khona kwirediyo ye-valve, ndonwabile kakhulu ukusebenzisa imitha kunye nomjikelezo ochanekileyo.
Zonke ezi zinto zingcono malunga nezinye ii-multimeters zivela ekungaqondisweni kwesicelo esilindelekileyo se-HP3458A.Ayisetyenziselwa ukufumana iimpazamo ngokubanzi, kodwa kuphawu lwesemiconductor, kunye nokuchaneka kwayo kuluhlu lwe-A kunye ne-UV ngenene lugqwesile.Umsebenzi wokulinganisa ucingo lwe-4 (jonga izithuba ezi-6 zokubopha) kunye nolawulo lwe-HPIB bubungqina obongezelelweyo obusetyenziswa kakhulu ekuboniseni izixhobo ze-semiconductor.
Ndithenge i-5.5 Keithley endala kwaye ndayilinganisa ngumhlobo.Kunyaka ophelileyo, bekuluncedo ngokwenene.Ukusuka kwi-transistors ehambelanayo ukuya kumlinganiso we-impedance ye-audio amplifiers.
I-Fluke 77 inokuba sisixhobo esilungileyo senjongo jikelele, kodwa ayisosona sixhobo "sigqwesileyo" kuyo nayiphi na imeko.Nokuba zithini na iimfuno zakho, uFluke uthengisa ngcono: iimoto?88V.Indawo eqhumayo?87V indawo erhabaxa enokumelana nokudubula?28 Zimbini.Ishishini ngokubanzi?87V.irekhodi data?287 / 289. Ulawulo lwenkqubo yoshishino?789.
Ukongeza kweminye imisebenzi i-77 ayinakuyenza konke konke, nayiphi na yezi zixhobo inokusingatha nawuphi na umsebenzi uFluke 77 onokuwugqiba, ngokuchaneka okuphezulu kunye ne-bandwidth ebanzi.ubushushu?Ukuqhuba?Umjikelo womsebenzi we-PWM/ububanzi be-pulse?rhoqo?microampere?Isantya esijikelezayo?Amandla ombane eRMS ayinyani?Umnqweno omhle.
Xa ithengisa ngeedola ezingama-300 kwiAmazon, asinakukwazi nokutsho ukuba iFluke 77 lukhetho lohlahlo lwabiwo-mali lwabangabasafundanga.Ewe kunjalo, inexabiso eliphantsi kunezinye iimitha ezidwelisiweyo, kodwa loo nto ayithethi kakhulu.(I-289 ngoku ithengiswa kumaqela anomdla nge-570 yeedola).Inyaniso kukuba ukuba usebenzisa iimitha ukwenza imali, ngoko iFluke echanekileyo iya kuzihlawulela ngokukhawuleza.Mhlawumbi ufuna kuphela imisebenzi engama-77.Kulungile, thenga i77.
Into inje.Mhlawumbi abasebenzisi beshishini banokuchaza ngokungqongqo iimfuno zabo zemihla ngemihla.Mhlawumbi inkampani ithumele amagcisa angama-77s ngaphandle, kwaye umphathi wayebambe into enamandla ngakumbi (efana ne-87s ene-thermocouples) kwiimeko ezinqabileyo ezifuna umlinganiselo wobushushu.Oku kubonakala kuyinto yobulumko ukunciphisa iindleko zangaphambili, umngcipheko ngenxa yobusela okanye ilahleko, njl., Kodwa unokuqalisa ukuphuculwa kweyure nganye oyichithayo kwimitha.
Ii-Hobbyists azifane zichazwe ngokungqongqo iimfuno, kwaye azinaso isicwangciso sokuhla kwexabiso esingasetyenziselwa ukuhlawula iindleko kwiminyaka emininzi.Ukuba kufuneka sithenge iimitha ezimbini, ngokuqhelekileyo kungcono ukuthenga okulungileyo okokuqala.
Ngomonde, ekugqibeleni ndifumene iFluke 189 yam esetyenzisiweyo (umanduleli we-289) kwi-craigslist ngexabiso elithotyiweyo.Kubonakala ngathi ayizange ishiye ibhokisi yayo kwaye ayiphawulwanga ngokupheleleyo.Ingcebiso yam kwabanye abantu abanomdla wokuzilibazisa kukuthenga eyona Fluke isetyenziswayo inamandla onokuyihlawula.Oko kunokuba ngama-77.
Andisoze ndiqonde ukusebenza kwangaphakathi kolu hlobo lwegiya.Ngokucacileyo, wenjenjalo, kwaye kwakubangel’ umdla kakhulu ukumbukela elungisa into ababenokuyiyeka ngokuqondakalayo abanye abantu.
imitha yam yokuthwala imihla ngemihla yi-Fluke 8060A, endiyithengileyo ngo-1983. Xa i-Simpson 260 ilawula i-toolkit ye-technician toolkit, yayiyisixhobo sokutshintsha umdlalo, kwaye i-8060A yayilungile.Malunga ne-1990, kuye kwafuneka ndithumele i-8060A yam ku-Fluke ngenxa yokuba i-chip yokubonisa umqhubi yaphukile, kodwa emva kokulungiswa, bendisebenzisa i-8060A rhoqo.Kutshanje ndilinganise i-Keysight 34461A 6.5 digit yebenchtop meter.Ngexesha lomlinganiselo wombane wexeshana, ukutenxa kweFluke 8060 ukusuka kwi-34461A ngaphakathi kwe-bandwidth yayo elinganisiweyo yayingaphakathi kwe-1%.Oku akukubi kwisilinganisi-manzi esijingayo kwikhithi iminyaka engama-30 ukusukela okokugqibela ukulinganisa.
NdineFluke 80sumthinsumpthinA endala.Malunga neminyaka eyi-20 eyadlulayo, ndathenga indawo yokugqibela yeLCD awayenayo uFluke esitokhweni sayo!
Ngokusebenzisa iwebhusayithi yethu kunye neenkonzo, uvumelana ngokucacileyo nokubekwa kwenkqubo yethu, ukusebenza kunye neekuki zentengiso.Funda nzulu
Ixesha lokuposa: Oct-21-2021
