Pomoc oko jEbaya i ampermetra

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Uzeo sam ovaj volt/amper metar i imam pitanje.



Po meni trebaju obje vrijednosti biti nula jer je to samo napon za  



njega. On prikaze samo voltazu jer i dalje prikazuje tih 49,7A . Probao sam  
sve moguce kombinacije i uvijek je isto.

Ne znam dali ima kakva "reset" tipka , a mozda nesto i krivo spajam. Iako se  
tu nema sta krivo spojiti...  :)


http://www.ebay.com/itm/111424457181?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649



Re: Pomoc oko jEbaya i ampermetra

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f  



Re: Pomoc oko jEbaya i ampermetra




oko 2,5$.
Nikako bez toga ne moze ili?  



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f  



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Dakle ne mogu ampere mjeriti? Volte mjeri.
Ebemu kineze.  :)  



Re: Pomoc oko jEbaya i ampermetra
Dana 08.09.2014 15:15, Kresimir je napisao:
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Zdravoseljacki nacrtano :o):
        ___A___
       I       I
+_____I_shunt_I_______+
                  I
                  V
-________________I____-

Re: Pomoc oko jEbaya i ampermetra






prave.
Valjda ce biti OK.   :)



Re: Pomoc oko jEbaya i ampermetra
Dana 8.9.2014. 12:39, Kresimir je napisao:
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Galvanski odvojeno napajanje.

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instrument ispravan.


http://www.ebay.com/itm/New-100V-100A-DC-Digital-Voltmeter-Ammeter-LED-Amp-Volt-Meter-Current-Shunt/291079963241?_trksid=p2047675.c100010.m2109&_trkparms=aid%3D555012%26algo%3DPW.MBE%26ao%3D1%26asc%3D20131231084308%26meid%3Dde1e2df95fdd41099416a43b3a3530c8%26pid%3D100010%26prg%3D20131231084308%26rk%3D3%26rkt%3D24%26sd%3D111424457181&tfrom11%1424457181&tpos=unknow&ttype=price&talgo=origal


Re: Pomoc oko jEbaya i ampermetra


postavi neki poznati napon i poznati otpor ( 10V / 10 oma = 1 A )




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Drugo nisam mu rekao da kupi instrument sa linka koji sam mu postavio u  
postu, niti da kupi gotov

nezna spojiti shunt i ampermetar

Pozdrav.  


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Re: Pomoc oko jEbaya i ampermetra


treba.


da isprobavam sve varijante.








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Pokazivanje bi mu ovisilo o otporu shunta!?




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Nitko i ne tvrdi da je instrument ispravan ako pokazuje nulu, nego samo  
dokazuje da instrument



se vjerojatno inducira napon


predstavljaju shunt, pa je napon nula i ampermetar pokazuje nulu. Da bi  
saznao koju vrijednost shunta treba staviti,
on mora prvo utvrditi kolika je osjetljivost ulaza, odnosno koliko je  
milivolti potrebno dovesti za maximalno pokazivanje instrumenta
na ampermetarskom ulazu.

Drugo, na linku koji je naveo u prvom postu pod specifikacijama instrumenta  
se nigdje ne spominju amperi, samo rezolucija instrumenta na

Pogledaj specifikacije na linku koji je dao. :) :)  


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model izgleda nema to.
Ovaj moj primjerak:
http://www.ebay.com/itm/DC-0-100V-10A-Voltmeter-Ammeter-Blue-Red-LED-Panel-Amp-Digital-Volt-Gauge-meter-/121388111083?ssPageNameAD%ME:L:OU:US:3160
ima shunt za 10A.

Prema tome, otpor shunta je 30 milioma,


Dobra vijest kod ovoga s linka je da su crna od napajanja i crna od mjernih  
ulaza kratko spojena,

( testirano)!


neki standard 200mV





Re: Pomoc oko jEbaya i ampermetra


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Nekad su multimetri koristili A/D konverter ICL 7106/7 kojemu se za ulaz  

druga referentna vrijednost.

je unutra.  


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Istina, nisam gledao. Ako napravim shunt mozda "proradi" obzirom kako imaju  
amperi na displeju.   :)  



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ako je otpor jako veliki tad instrument sigurno

Ohma.
Seller na E-bayu je stavio naziv proizvoda: DC 4.5-30V 0-50A Dual LED  
Digital Volt meter Ammeter Voltage AMP Power ES9P T7.




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