AUDIO DISC w GM2 , do czego służy

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Witam , do czego służy AUDIO DISC w GM2 ? co to jest ? bo prawdopodobnie źle tą funkcję interpretuję... :)

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Ktoś , coś wie?

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?

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Już wszystko wiem , taką odpowiedź dostałem od producenta : This setting controls how the detector handles deep signals. At FULL it discriminates at the full depth of the coil range. At Normal, the discrimination works at around 80% of the maximum range.
The setting is needed, because discrimination always lowers the total depth, so at FULL the depth is lower than at NORMAL.
FULL is used on iron-infested sites.
At OFF, the detector works as all metal machine. When the AUDIO DISC is at OFF, you can use the VCO to determine the metal type