ELEKTRICNI MJERNI INSTRUMENTI
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Transcript of ELEKTRICNI MJERNI INSTRUMENTI
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ELEKTRIČNI MJERNI INSTRUMENTI
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Električni mjerni instrumenti služe za neposredno mjerenje električnih veličina kao što su: napon, struja, snaga, otpor, faktor snage, frekvencija, kapacitet i slično.
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Karakteristične osobine mjernih instrumenata su:
električna veličina koja se mjeri, vrsta struje ili napona, preciznost, odnosno stupanj
točnosti, princip djelovanja
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Osnovni pokazni mjerni instrumenti za mjerenje istosmjernih struja i njihovi simboli u shemama
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Prema vrsti struje (napona) mjerni instrumenti nose dodatnu oznaku, odnosno simbol kako je to
prikazano
Simbol Značenje simbola
Istosmjerna struja
Izmjenična struja
Istosmjerna i izmjenična struja
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Klasa točnosti mjernih instrumenata
0.05 etalonski0.1 etalonski0.2 etalonski0.5 koristi se u laboratorijima1.0 pogonski1.5 pogonski2.5 pogonski5 pogonski
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Princip djelovanja mjernih instrumenata
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Oznake za karakterističan položaj instrumenata
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Ispitni naponi instrumenata
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Primjer zapisa podataka o korištenom mjernom instrumentu
1. V,A,Ω2. Ist. i izmj.struja3. Pomični svitak4. Kl.toč.2,55. Položaj
vertikalni6. Ispitni napon7. Ser.broj i
proizvođač
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Spajanje instrumenata
Spajanje ampermetra
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Spajanje instrumenataSpajanje voltmetra
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Spajanje instrumenata
Pravilno i nepravilno mjerenje napona
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Spajanje instrumenataMjerenje otpora
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Dodatci o mjernim instrumentima
Još neke oznake karakteristične za analogne mjerne instrumente
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Dodatci o mjernim instrumentima
Primjeri analognih mjernih instrumenata A,V i W
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