[UMarco] Ubheke amamitha amaningi.Nokho, ucabanga ukuthi i-HP3458A iyona engcono kakhulu, nakuba yethulwa eminyakeni engaphezu kwengu-30 edlule ngo-1989. Othile wanikela ngayo [ku-Marco], kodwa yabonisa imilayezo ethile yephutha futhi yabonisa ukuziphatha okungazinzile lapho iqala, ngakho wayedinga ukulungiswa okuthile.
Ngokuka-[Marco], ikhodi yephutha ikhombisa inkinga ngesiguquli se-analog-to-digital esinemithambeka eminingi, okuyikona okwenza imitha ihluke.Imitha inamadijithi angu-8.5, ngakho-ke isigaba esivamile sokuguqula ngeke sisike.
Okuhle ngalolu daba wukuthi lusinika izaba zokubheka ngaphakathi ebhokisini.Wonke ama-motherboard angaphakathi abukeka eyinkimbinkimbi njengebhodi lesimanje le-PC.Ngaphakathi kwalolu hlu lokunemba, ibhodi lesifunda limbozwe kunethiwekhi eyenziwe ngezifiso yokumelana nokusebenza okuphezulu.
Indlela evamile yokuguqula i-voltage enombolweni isebenzisa isikhathi esidingekayo ukushaja nokukhipha i-capacitor, futhi isikhathi esidingekayo simelela i-voltage.Imitha isebenzisa izithasiselo eziningi ezingase zibe khona ezingaba khona zemithambeka, [uMarco] ichaza ukuthi imitha isebenzisa kanjani umthambeko osheshayo futhi onembe kancane ukuze ifundeke kanzima, bese isebenzisa i-slope enensayo nenembile ukuze icwenge izinombolo eziphansi.
I-chip yangokwezifiso ine-IC kanye nenethiwekhi yangokwezifiso yokumelana.Uma ihluleka, imitha cishe akunakwenzeka ukuyilungisa ngaphandle kokuya esikhungweni senkonzo yefekthri ukuthenga ibhodi lesifunda elisha ngemali engaba ngu-$3,000.I-chip yangokwezifiso ibonakala isebenza kahle, futhi ukufaka esikhundleni sesiqhathanisi okwaziwa ukuthi siyahluleka akusizi.
Yini elandelayo?Thenga zonke izingxenye ongazitholela ibhodi lesifunda (cishe i-$ 100), bese ushintsha zonke izingxenye.Siyayithanda indlela yakhe yokukhipha umkhondo wengxenye engasasebenzi ngesikhathi sokwakha kabusha.Ekuqaleni, lokhu kwakubonakala kungenzeka, kodwa ukuzilinganisa kwehlulekile.Kubonakala sengathi i-IC yangokwezifiso kungenzeka ukuthi yephukile, ngakho ekugcineni washintsha lonke ibhodi lokuguqula.
Lokhu kwasula iphutha elikhulu, kodwa ezinye izilinganiso zazisenezinkinga, okubangele ukuba elinye ibhodi lilungiswe.Isekethe okukhulunywa ngayo yenza ukuguqulwa kwe-RMS kumasignali e-AC.Imitha inezindlela ezahlukahlukene zokukala i-RMS.
Le vidiyo iyindaba enhle kakhulu yomphenyi, futhi uzofunda okuningi ngamamitha anokucaca okuphezulu.Uma konke sekujwayelekile, sizobona izinto ezingajwayelekile, njengezintambo ezisebenza njengama-capacitor namafeni anomsindo.
Ngake ngasebenza nonjiniyela owaklama ingxenye ye-analog.Uthe lokhu kungumzamo omkhulu, futhi benze umsebenzi omningi kunalokho abebekulindele.Ukholelwa ukuthi lokhu kuyingxenye yesizathu sokuthi kungani i-HP/Agilent/Keysight iqalile kodwa ayizange iqedele inguqulo yokuthuthukisa.UFluke kuphela one-DMM efanayo, futhi kungashiwo ukuthi i-3458 isengcono kakhulu.Kunzima kakhulu ukukhiqiza imikhiqizo engcono ngobuningi.
Othile wangitshela ukuthi i-AVO8 iyi-multimeter engcono kakhulu engathengwa ngemali.Iqoshwe etsheni, uMose alehlisa entabeni ngesikhathi sokunqoba.Kusobala ukuthi ngangidukisiwe.
Njengoba i-AVO8 ingavamile kulolu hlangothi lwechibi, ngithole ukuthi lokhu ukufunda okuthakazelisayo… http://www.richardsradios.co.uk/avo8.html
Ngihalela i-AVO 8 ngisemusha, kodwa amanani ayo ayengaphezu kwamandla ami.Ngemva kweminyaka engu-40, ngine-Mk II ebhentshini lami.Esimeni esiyinqaba lapho ngisebenza khona kumsakazo we-valve, ngijabule kakhulu ukusebenzisa imitha ngomjikelezo olungile.
Konke lokhu buciko obungcono obumayelana namanye ama-multimeters busukela ekungaqondisweni kokusetshenziswa okulindelekile kwe-HP3458A.Ayisetshenziselwa ukuthola amaphutha ajwayelekile, kodwa ekucacisweni kwezinhlamvu ze-semiconductor, nokunemba kwayo ebangeni le-A ne-UV kuhle kakhulu.Umsebenzi wokulinganisa wezintambo ezi-4 (bona okuthunyelwe okubophezela okungu-6) kanye nokulawula kwe-HPIB kuwubufakazi obengeziwe bokuthi isetshenziswa kakhulukazi ukuveza amadivaysi e-semiconductor.
Ngithenge i-5.5 Keithley endala futhi ngayilinganisa ngumngane.Ngonyaka odlule, bekulula ngempela.Kusukela ekufaniseni ama-transistors kuya ekulinganiseni okokufaka kwama-amplifiers omsindo.
I-Fluke 77 ingaba ithuluzi elihle lenhloso evamile, kodwa ayilona ithuluzi “elingcono kakhulu” kunoma iyiphi indawo.Noma ngabe ziyini izidingo zakho, uFluke uthengisa kangcono: izimoto?88V.Indawo eqhumayo?Imvelo enokhahlo engu-87V engaqhumi?28 Okubili.Imboni Ejwayelekile?87V.irekhodi idatha?287 / 289. Ukulawulwa kwenqubo yezimboni?789.
Ngaphezu kweminye imisebenzi i-77 engakwazi nhlobo ukuyenza, noma iyiphi yalezi zinsimbi ingakwazi ukuphatha noma yimuphi umsebenzi i-Fluke 77 engawuqedela, ngokunemba okuphezulu kanye nomkhawulokudonsa obanzi.izinga lokushisa?I-Conductivity?Umjikelezo womsebenzi we-PWM/ububanzi be-pulse?imvamisa?microampere?Isivinini esizungezayo?I-voltage ye-RMS yangempela?ngikufisela inhlanhla.
Uma ithengisa ngama- $ 300 e-Amazon, asikwazi ngisho nokusho ukuthi iFluke 77 inketho yesabelomali yabasakhulayo.Yebo, ishibhile kunamanye amamitha asohlwini, kodwa lokho akusho okuningi.(Izi-289 okwamanje zithengiselwa abantu abanentshisekelo nge-$570).Iqiniso liwukuthi uma usebenzisa amamitha ukwenza imali, iFluke efanele izozikhokhela ngokushesha.Mhlawumbe udinga kuphela imisebenzi engama-77.Kulungile, thenga engu-77.
Into injena.Mhlawumbe abasebenzisi bebhizinisi bangachaza izidingo zabo zansuku zonke.Mhlawumbe inkampani ithumele ochwepheshe abangama-77s ngaphandle, futhi umphathi wayephethe okuthile okunekhono (okufana nama-87s nama-thermocouples) ezimweni ezingavamile ezidinga ukukalwa kwezinga lokushisa.Lokhu kubonakala kuyinto ehlakaniphile ukunciphisa izindleko zangaphambili, ingozi ngenxa yokweba noma ukulahlekelwa, njll., kodwa ungaqala ukuthuthukiswa njalo ngehora olichitha kumitha.
Abathanda izinto zokuzilibazisa abavamile ukuba nezidingo ezichazwe ngokuqinile, futhi abanalo uhlelo lokwehla kwenani elingasetshenziswa ukuze kuncishiswe izindleko phakathi neminyaka embalwa.Uma kufanele sithenge amamitha amabili, ngokuvamile kungcono ukuthenga elungile okokuqala ngqa.
Ngokubekezela, ekugcineni ngithole i-Fluke 189 yami esetshenzisiwe (eyandulela engu-289) ku-craigslist ngentengo ehlisiwe.Kubonakala sengathi ayikaze ishiye ibhokisi layo futhi ayimakiwe ngokuphelele.Iseluleko sami kwabanye abenza umsebenzi wokuzilibazisa ukuthi bathenge i-Fluke enamandla kakhulu ongakwazi ukuyikhokhela.Lokho kungase kube ngisho nama-77.
Ngeke ngikuqonde ukusebenza kwangaphakathi kwalolo hlobo lwegiya.Ngokusobala, wakwenza, futhi kwakujabulisa kakhulu ukumbona elungisa okuthile abanye abantu ababengayeka ngokuqondakalayo.
Imitha yami yokuthwala yansuku zonke i-Fluke 8060A, engayithenga emuva ngo-1983. Ngenkathi i-Simpson 260 ibusa ikhithi yamathuluzi ochwepheshe, kwakuyithuluzi elishintsha umdlalo, futhi i-8060A yayisalungile.Cishe ngo-1990, kwadingeka ngithumele i-8060A yami emuva ku-Fluke ngoba i-chip yomshayeli wesibonisi yayiphukile, kodwa ngemva kwalokho kulungiswa, bengilokhu ngisebenzisa i-8060A njalo.Ngisanda kulinganisa imitha ye-benchtop yamadijithi angu-Keysight 34461A 6.5.Ngesikhathi sokukalwa kwamandla kagesi wesikhashana, ukuchezuka kwe-Fluke 8060 isuka ku-34461A ngaphakathi komkhawulokudonsa wayo olinganiselwe bekungaphakathi kuka-1%.Lokhu akukubi ngemitha osekuphele iminyaka engu-30 ilenga kwikhithi kusukela yagcina ukulinganiswa.
Ngine-Fluke 80sumthinsumpthinA endala.Cishe eminyakeni engu-20 edlule, ngathenga i-LCD yokugcina esikhundleni uFluke ayenayo esitokweni sayo!
Ngokusebenzisa iwebhusayithi yethu namasevisi, uvumelana ngokusobala nokubekwa komsebenzi wethu, ukusebenza namakhukhi okukhangisa.Funda kabanzi
Isikhathi sokuthumela: Oct-21-2021
