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Are two basic ways of measurement: the direct method and the indirect method. The direct method of measurement, which are characterized in particular gets on the result immediately when the effect of the unknown amount entered in the device or the system, they are divided, according to the technique used to show the result, to the way of representative analogue method digital way digital method. The way representative characterized the relationship between the well-known quantitative device and narrated income shall be two representatives of time aftershocks continuous (uninterrupted) Any that they are identical. The digital method characterized by linking relationship between the known values of the machine income and narrated However, the amount of output continued uninterrupted time that any output signal cut off in time and the results give figures on the panel show
