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Osciloscop Tesla BM463

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Am un osciloscop TESLA BM 463 care realizeaza deflexia pe verticala a spotului pe ambele canale (CH A si CH B) in felul precizat mai jos. Butonul Channel Swiching este pe Alternate adica vizualizez cele doua canale simultan. Cu un generator aplic un semnal sinusoidal la bornele CH A sau CH B. Daca vreau sa deplasez imaginea semnalul de pe ecran in sus sau jos cu Y Shift nu obtin decat o distorsiune in forma a semnalului sinusoidal fara a-l deplasa pe verticala; la fel pe ambele canale. Daca nu aplic nici un semnal la CH A sau CH B, atunci cand vreau sa deplasez pe verticala cele doua linii orizontale care corespund CH A si CH B, cu acelas buton de reglaj Y Shift, nu obtin decat o deplasare foarte mica. Iar cele doua linii aproape se suprapun. Are cineva o idee unde este hiba?  Multumesc anticipat.


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