[Marco] Anayang'ana mamita ambiri.Komabe, akuganiza kuti HP3458A ndi yabwino kwambiri, ngakhale kuti adayambitsidwa zaka zoposa 30 zapitazo mu 1989. Winawake anapereka kwa [Marco], koma adawonetsa mauthenga olakwika ndikuwonetsa khalidwe losakhazikika pamene linayamba, kotero adafunikira kukonzanso.
Malinga ndi [Marco], nambala yolakwika ikuwonetsa vuto ndi chosinthira chosinthika cha analogi kupita ku digito, chomwe ndi chomwe chimapangitsa mita kukhala yapadera.Mamita ali ndi manambala a 8.5, kotero gawo losinthika labwino silingadule.
Nkhani yabwino yokhudza nkhaniyi ndi yakuti imatipatsa chifukwa choyang'ana mkati mwa bokosi.Bolodi iliyonse yamkati imawoneka yovuta ngati bolodi yamakono ya PC.M'kati mwazolondola izi, bolodi loyang'anira dera limakutidwa ndi netiweki yokhazikika kwambiri.
Njira yokhazikika yosinthira magetsi kukhala nambala imagwiritsa ntchito nthawi yomwe ikufunika kulipiritsa ndikutulutsa capacitor, ndipo nthawi yofunikira imayimira voteji.Mamita amagwiritsa ntchito zopinga zingapo zomwe zingatheke potsetsereka, [Marco] akufotokoza momwe mita imagwiritsira ntchito otsetsereka mofulumira komanso osalondola kuti awerenge movutikira, ndiyeno amagwiritsa ntchito otsetsereka pang'onopang'ono komanso molondola kuti ayese manambala otsika.
Chip chokhazikika chili ndi IC ndi netiweki yotsutsa.Ngati italephera, mitayo imakhala yosatheka kukonzanso popanda kupita ku malo opangira ntchito za fakitale kukagula gulu latsopano ladera pafupifupi $3,000.Chip chodziwika bwino chikuwoneka kuti chikugwira ntchito bwino, ndipo kuchotsa chofananira chomwe chimadziwika kuti chalephera sikuthandiza.
Chotsatira ndi chiyani?Gulani mbali zonse zomwe mungapeze pa bolodi la dera (pafupifupi $ 100), kenaka m'malo mwake zigawo zonse.Timakonda njira yake yochotsera zida zosafunikira panthawi yomanganso.Poyamba, izi zinkawoneka zotheka, koma kudziyesa nokha kunalephera.Zikuwoneka kuti mwambo wa IC ukhoza kusweka, kotero pamapeto pake adalowa m'malo mwa bolodi yonse yosinthira.
Izi zinathetsa vuto lalikulu, koma miyeso ina inali ndi mavuto, zomwe zinapangitsa kuti bolodi lina likonzedwe.Dera lomwe likufunsidwa limachita kutembenuka kwa RMS pazizindikiro za AC.Mamita ali ndi njira zosiyanasiyana zoyezera RMS.
Kanemayu ndi nkhani yabwino yofufuza, ndipo muphunzira zambiri zamamita okwera kwambiri.Chilichonse chikakhala bwino, tidzawona zinthu zachilendo, monga zingwe zomwe zimagwira ntchito ngati ma capacitor ndi mafani aphokoso.
Nthaŵi ina ndinagwira ntchito ndi injiniya amene anapanga gawo la analogi.Iye ananena kuti imeneyi ndi ntchito yaikulu, ndipo agwira ntchito yochuluka kuposa mmene ankayembekezera.Amakhulupirira kuti ichi ndi chimodzi mwa zifukwa zomwe HP/Agilent/Keysight yayambira koma sanamalize kukonzanso.Fluke yekha ali ndi DMM yofananira, ndipo tinganene kuti 3458 ikadali yabwino kwambiri.Ndizovuta kwambiri kupanga zinthu zabwino kwambiri.
Wina anandiuza kuti AVO8 ndiye multimeter yabwino kwambiri yomwe ndalama zingagule.Ilo chosemedwa pamwala, umene Mose anautsitsa m’phiri panthaŵi ya chipambano.Mwachionekere ndinasokeretsedwa.
Popeza AVO8 si wamba mbali iyi ya dziwe, ndinapeza izi kukhala kuwerenga chidwi… http://www.richardsradios.co.uk/avo8.html
Ndinkalakalaka AVO 8 ndili wachinyamata, koma mitengo yawo inali yoposa mphamvu zanga.Zaka 40 pambuyo pake, ndili ndi Mk II pa benchi yanga.Muzochitika zodabwitsa zomwe ndimagwira ntchito pa wailesi ya valve, ndine wokondwa kwambiri kugwiritsa ntchito mita ndi kuzungulira kolondola.
Kumvetsetsa kwabwinoko kokhudza ma multimeters ena kumachokera ku kusamvetsetsa komwe kukuyembekezeka kugwiritsa ntchito HP3458A.Simagwiritsidwa ntchito pofufuza zolakwika wamba, koma mawonekedwe a semiconductor, ndipo kulondola kwake pamitundu ya uA ndi UV ndiyabwino kwambiri.Ntchito yoyezera mawaya a 4 (onani zolemba 6 zomangirira) ndi kuwongolera kwa HPIB ndi umboni wowonjezera womwe umagwiritsidwa ntchito makamaka kuzindikiritsa zida za semiconductor.
Ndinagula 5.5 Keithley yakale ndikuyiyesa ndi mnzanga.M’chaka chathachi, zinalidi zabwino.Kuchokera kufananiza ma transistors mpaka kuyeza kulowetsedwa kwa ma audio amplifiers.
Fluke 77 ikhoza kukhala chida chabwino kwambiri, koma sichida "chabwino" pamalo aliwonse.Ziribe kanthu zomwe mukufuna, Fluke amagulitsa bwino: magalimoto?88v ndi.Malo ophulika?87V malo osaphulika osaphulika?28 Awiri.General Industry?87v ndi.mbiri ya data?287 / 289. Kulamulira kwa mafakitale?789.
Kuphatikiza pa ntchito zina zomwe 77 sangathe kuchita nkomwe, chilichonse mwa zidazi chingathe kugwira ntchito iliyonse yomwe Fluke 77 ikhoza kumaliza, yolondola kwambiri komanso bandwidth yotakata.kutentha?Conductivity?PWM ntchito kuzungulira / kugunda m'lifupi?pafupipafupi?microampere?Liwiro lozungulira?Mphamvu ya RMS yowona?zabwino zonse.
Ikagulitsa $300 pa Amazon, sitinganene kuti Fluke 77 ndi njira yopangira bajeti kwa amateurs.Zachidziwikire, ndiyotsika mtengo kuposa mita ina yomwe yatchulidwa, koma sizinena zambiri.(289 ikugulitsidwa pano kwa anthu omwe ali ndi chidwi ndi $570).Chowonadi ndi chakuti ngati mutagwiritsa ntchito mamita kupanga ndalama, ndiye kuti Fluke yolondola idzadzilipira mwamsanga.Mwina mumangofunika ntchito 77 zokha.Chabwino, gulani 77.
Zinthu zili chonchi.Mwina ogwiritsa ntchito amalonda amatha kufotokozera zosowa zawo zatsiku ndi tsiku.Mwina kampani inatumiza akatswiri a 77s kunja, ndipo woyang'anira anali atanyamula chinachake chokhoza (monga 87s ndi thermocouples) pazochitika zomwe zimafuna kuyeza kutentha.Izi zikuwoneka ngati chinthu chanzeru kuchepetsa mtengo wapamwamba, chiopsezo chifukwa cha kuba kapena kutayika, ndi zina zotero, koma mukhoza kuyamba kukonzanso ola lililonse lomwe mumawononga pa mita.
Ochita masewera olimbitsa thupi sakhala ndi zofunikira zodziwika bwino, komanso alibe ndondomeko yotsika mtengo yomwe ingagwiritsidwe ntchito kuwonongera ndalama kwa zaka zingapo.Ngati tiyenera kugula mamita awiri, nthawi zambiri ndi bwino kugula yoyenera kwa nthawi yoyamba.
Moleza mtima, pomalizira pake ndinapeza Fluke 189 yanga yogwiritsidwa ntchito (yomwe inatsogolera 289) pa craigslist pamtengo wotsika.Zikuwoneka kuti sichinachoke m'bokosi lake ndipo sichinatchulidwe konse.Langizo langa kwa ena okonda masewera ndikugula Fluke yamphamvu kwambiri yomwe mungakwanitse.Izi zitha kukhala 77.
Sindidzamvetsetsa momwe zida zamtunduwu zimagwirira ntchito.Mwachionekere, iye anatero, ndipo zinali zosangalatsa kwambiri kumuwona akukonza chinthu chimene anthu ena akanatha kuchisiya momveka.
Miyendo yanga yonyamula tsiku ndi tsiku ndi Fluke 8060A, yomwe ndinagulanso mu 1983. Pamene Simpson 260 inalamulira zida zaukadaulo, chinali chida chosinthira masewera, ndipo 8060A idakali yabwino.Cha m'ma 1990, ndimayenera kutumiza 8060A yanga ku Fluke chifukwa chipangizo choyendetsa galimoto chinasweka, koma nditatha kukonza, ndakhala ndikugwiritsa ntchito 8060A pafupipafupi.Posachedwa ndidayesa ma benchtop mita ya Keysight 34461A 6.5.Pakuyezera kwakanthawi kwamagetsi, kupatuka kwa Fluke 8060 kuchokera ku 34461A mkati mwa bandwidth yake yovotera kunali mkati mwa 1%.Izi sizoyipa kwa mita yomwe yakhala ikulendewera mu zida kwa zaka 30 kuchokera pomwe idasinthidwa komaliza.
Ndili ndi Fluke 80sumthinsumpthinA yakale.Pafupifupi zaka 20 zapitazo, ndinagula LCD yomaliza yomwe Fluke anali nayo!
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Nthawi yotumiza: Oct-21-2021
