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etaj intrare voltmetru de alternativ 1mV - 1000 mV


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Am si eu nevoie de o schema (am cautat ceva da nu am gasit ce vreau eu) cu care sa pot masura tensiuni alternative mici, de la 1mV in sus, la frecventa retelei. Banuiesc ca ceva cu 1-2 AO-uri. Ma intereseaza in special pentru a masura caderea pe un shunt la reteaua de 220 pentru masurat curent/consum, dar si pentru ca nu am la aparatu de masura scala mica pe Vca.

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pentru ca acest topic sa nu fie fara rost, nesinchisindu-se nimeni de un raspuns, am gasit ce vroiam si pun si aici.

E vorba de redresare fara prag, dioda fara prag cum zice in seria de articole din revista Tehnium 12/1984, 1,2,3,4/1985. Un alt exemplu practic, e un multetrul cu C520D din tehnium 11/1988 pagina 10 .

 

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