[Marco] Saib ntawm ntau meters.Txawm li cas los xij, nws xav tias HP3458A yog qhov zoo tshaj plaws, txawm tias lawv tau tshaj tawm ntau dua 30 xyoo dhau los hauv 1989. Ib tug neeg tau pub ib qho rau [Marco], tab sis nws tau qhia qee cov lus yuam kev thiab pom cov cwj pwm tsis ruaj khov thaum nws pib, yog li nws xav tau qee qhov kev kho.
Raws li [Marco], tus lej yuam kev qhia tias muaj teeb meem nrog ntau txoj kab nqes analog-rau-digital converter, uas yog qhov ua rau lub ntsuas qhov txawv.Lub 'meter' muaj 8.5 tus lej, yog li lub sijhawm hloov pauv ib txwm yuav tsis txiav nws.
Cov xov xwm zoo txog qhov teeb meem no yog tias nws muab kev zam txim rau peb saib hauv lub thawv.Txhua lub motherboard sab hauv zoo li nyuaj li niaj hnub PC motherboard.Nyob rau hauv qhov tseeb ntau yam no, lub rooj tsav xwm Circuit Court tau them rau hauv ib qho kev ua haujlwm siab tiv thaiv network.
Tus txheej txheem ntawm kev hloov hluav taws xob mus rau tus lej siv lub sijhawm yuav tsum tau them thiab tso tawm lub capacitor, thiab lub sijhawm xav tau sawv cev rau qhov voltage.Lub 'meter' siv ntau txoj kab nqes hav resistors, [Marco] piav qhia yuav ua li cas lub 'meter' siv txoj kab nqes nrawm thiab tsawg dua kom tau txais kev nyeem ntxhib, thiab tom qab ntawd siv txoj kab nqes qeeb thiab raug los kho cov lej qis dua.
Cov kev cai nti muaj IC thiab ib qho kev cai resistor network.Yog tias nws ua tsis tau, lub 'meter' yuav luag tsis tuaj yeem kho yam tsis tau mus rau qhov chaw pabcuam hauv lub Hoobkas kom yuav lub rooj tsavxwm tshiab rau txog $ 3,000.Cov kev cai nti zoo li ua haujlwm zoo, thiab hloov cov neeg sib piv uas paub tias ua tsis tau zoo.
Tom ntej no yog dab tsi?Yuav tag nrho cov khoom uas koj tuaj yeem nrhiav tau rau lub rooj tsav xwm Circuit Court (kwv yees li $ 100), thiab tom qab ntawd hloov tag nrho cov khoom.Peb nyiam nws txoj hauv kev tshem tawm cov khoom siv tsis tu ncua thaum lub sijhawm rov tsim kho.Thaum xub thawj, qhov no zoo li ua tau, tab sis tus kheej-calibration ua tsis tau.Nws zoo nkaus li tias qhov kev cai IC yuav raug tawg, yog li nws thiaj li hloov tag nrho lub rooj tsav xwm hloov pauv.
Qhov no tshem tawm qhov yuam kev loj, tab sis qee qhov kev ntsuas tseem muaj teeb meem, ua rau lwm lub rooj tsavxwm raug kho.Lub voj voog hauv nqe lus nug ua RMS hloov pauv ntawm AC cov cim.Lub 'meter' muaj ntau txoj hauv kev los ntsuas RMS.
Daim vis dis aus no yog ib zaj dab neeg tshawb nrhiav zoo, thiab koj yuav kawm ntau yam txog cov ntsuas ntsuas siab.Thaum txhua yam zoo li qub, peb yuav pom qee yam coj txawv txawv, xws li cov kab hluav taws xob ua lub zog thiab cov kiv cua nrov.
Kuv ib zaug ua hauj lwm nrog ib tug engineer uas tsim cov analog.Nws hais tias qhov no yog kev siv zog loj heev, thiab lawv tau ua haujlwm ntau dua li qhov lawv xav tau.Nws ntseeg tias qhov no yog ib feem ntawm qhov laj thawj vim li cas HP / Agilent / Keysight tau pib tab sis tsis tau ua tiav qhov kev hloov kho tshiab.Tsuas yog Fluke muaj qhov sib piv DMM, thiab nws tuaj yeem hais tias 3458 tseem yog qhov zoo tshaj plaws.Nws yog ib qho nyuaj heev rau huab hwm coj tsim cov khoom zoo.
Ib tug neeg hais rau kuv tias AVO8 yog qhov zoo tshaj plaws multimeter uas nyiaj tuaj yeem yuav.Nws yog carved rau ntawm ib lub pob zeb, uas Mauxes nqa los ntawm lub roob thaum lub yeej.Kuv twb obviously dag.
Txij li thaum AVO8 tsis muaj nyob rau sab ntawm lub pas dej, kuv pom qhov no yog qhov kev nyeem ntawv nthuav… http://www.richardsradios.co.uk/avo8.html
Kuv ntshaw AVO 8 thaum kuv tseem hluas, tab sis lawv cov nqi tau dhau kuv lub peev xwm.40 xyoo tom qab, kuv muaj Mk II ntawm kuv lub rooj zaum.Hauv qhov xwm txheej txawv txawv uas kuv ua haujlwm ntawm lub xov tooj cua valve, kuv zoo siab heev los siv lub ntsuas ntsuas nrog lub voj voog kom raug.
Tag nrho cov no zoo dua sophistry txog lwm yam multimeters stems los ntawm kev nkag siab yuam kev ntawm kev xav tau ntawm HP3458A.Nws tsis yog siv rau kev tshawb nrhiav qhov txhaum, tab sis rau cov yam ntxwv ntawm semiconductor, thiab nws qhov tseeb ntawm uA thiab uV ntau yog qhov zoo heev.Kev ntsuas 4-xaim muaj nuj nqi (saib 6 binding posts) thiab HPIB tswj yog cov pov thawj ntxiv uas nws yog siv los ua cov khoom siv semiconductor.
Kuv yuav ib tug qub 5.5 Keithley thiab calibrated nws los ntawm ib tug phooj ywg.Xyoo dhau los, nws yooj yim heev.Los ntawm kev sib piv cov transistors mus rau ntsuas qhov input impedance ntawm lub suab amplifiers.
Fluke 77 tej zaum yuav yog cov cuab yeej siv dav dav, tab sis nws tsis yog "zoo tshaj" ntsuas hauv ib puag ncig.Tsis muaj teeb meem dab tsi koj xav tau, Fluke muag zoo dua: tsheb?88v ua.Ib puag ncig tawg?87V tawg-pov thawj hnyav ib puag ncig?28 Ob.Kev lag luam General?87v ua.cov ntaub ntawv?287 / 289. Kev tswj cov txheej txheem?789 ua.
Ntxiv rau lwm yam dej num uas 77 tsis tuaj yeem ua txhua yam, ib qho ntawm cov cuab yeej no tuaj yeem ua haujlwm txhua yam uas Fluke 77 tuaj yeem ua tiav, nrog qhov tseeb dua thiab dav dua bandwidth.kub?conductivity?PWM Duty cycle/pulse width?zaus?microampere?Rotating ceev?Muaj tseeb RMS voltage?hmoov zoo.
Thaum nws muag rau $ 300 ntawm Amazon, peb tsis tuaj yeem hais tias Fluke 77 yog qhov kev xaiv nyiaj txiag rau cov neeg nyiam ua haujlwm.Tau kawg, nws yog pheej yig dua li lwm cov meters teev, tab sis qhov ntawd tsis qhia ntau.(289 tam sim no tau raug muag rau cov neeg txaus siab rau $ 570).Qhov tseeb yog tias koj siv meters kom tau nyiaj, ces qhov tseeb Fluke yuav sai sai them rau nws tus kheej.Tej zaum koj tsuas xav tau 77 lub luag haujlwm.ok, muas 77.
Qhov xwm txheej zoo li no.Tej zaum cov neeg siv lag luam tuaj yeem txiav txim siab lawv cov kev xav tau txhua hnub.Tej zaum ib lub tuam txhab xa 77s cov kws tshaj lij tawm, thiab tus thawj saib xyuas tau tuav qee yam muaj peev xwm (xws li 87s nrog cov thermocouples) rau cov xwm txheej tsawg uas yuav tsum tau ntsuas kub.Qhov no zoo li yog ib qho zoo tshaj plaws kom txo tau tus nqi pem hauv ntej, qhov kev pheej hmoo ntawm kev nyiag los yog poob, thiab lwm yam, tab sis koj tuaj yeem pib qhov kev txhim kho txhua teev koj pov tseg ntawm lub ntsuas.
Hobbyists tsis tshua muaj kev cai nruj me ntsis, thiab lawv tsis muaj ib txoj kev txo nqi uas yuav siv tau los txo cov nqi ntau xyoo.Yog tias peb yuav tsum yuav ob meters, feem ntau nws yog qhov zoo dua los yuav qhov zoo rau thawj zaug.
Ua siab ntev, thaum kawg kuv pom kuv siv Fluke 189 (tus thawj ntawm 289) ntawm craigslist ntawm tus nqi luv nqi.Nws zoo nkaus li tias nws yeej tsis tau tso nws lub thawv thiab tsis muaj cim kiag li.Kuv cov lus qhia rau lwm tus hobbyists yog mus yuav lub zog tshaj plaws siv Fluke koj tuaj yeem them taus.Qhov ntawd tej zaum yuav yog 77.
Kuv yuav tsis nkag siab qhov kev ua haujlwm sab hauv ntawm hom iav ntawd.Obviously, nws tau ua, thiab nws yog qhov nthuav heev los saib nws kho ib yam dab tsi uas lwm tus neeg tuaj yeem nkag siab tso tseg.
Kuv niaj hnub nqa meter yog Fluke 8060A, uas kuv yuav rov qab rau xyoo 1983. Thaum Simpson 260 txiav txim rau cov cuab yeej cuab tam, nws yog ib qho kev ua si-hloov ntsuas, thiab 8060A tseem zoo.Nyob ib ncig ntawm 1990, kuv yuav tsum xa kuv 8060A rov qab mus rau Fluke vim tias cov duab tsav tsheb tau tawg, tab sis tom qab kho qhov ntawd, kuv tau siv 8060A tsis tu ncua.Kuv nyuam qhuav ntsuas qhov Keysight 34461A 6.5 tus lej benchtop meter.Thaum lub sijhawm ntsuas hluav taws xob ib ntus, qhov sib txawv ntawm Fluke 8060 los ntawm 34461A hauv nws qhov ntsuas bandwidth yog nyob rau hauv 1%.Qhov no tsis yog qhov phem rau ib lub 'meter' uas tau dangling hauv cov khoom siv rau 30 xyoo txij li qhov kawg calibration.
Kuv muaj ib tug qub Fluke 80sumthinsumpthinA.Txog 20 xyoo dhau los, kuv yuav lub LCD hloov tshiab uas Fluke muaj nyob rau hauv Tshuag rau nws!
Los ntawm kev siv peb lub vev xaib thiab cov kev pabcuam, koj pom zoo meej rau qhov kev tso kawm ntawm peb qhov kev ua tau zoo, kev ua haujlwm thiab kev tshaj tawm cov ncuav qab zib.kawm ntxiv
Post lub sij hawm: Oct-21-2021
