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It is necessary to consider an error of digital indication also. During the work of the scheme of indication in the mode of a floating comma it will remain invariable in all range of the measured tension, and is equal to unit of the younger digital category. We will estimate a relative error of digital indication at the maximum measured relation KMAX=100 thus the weight of unit of the younger digital category is equal Δ = Then the error is equal

From expression (1 we will notice that the relative error of measurement of the relation is equal to a difference of relative errors of tension which relation needs to be defined. That is the multipleksivny error will be subtracted. However we need to estimate a limit error therefore we will consider a case when ΔU1 and ΔU2 have various signs. Thus the maximum relative error of measurement of the relation of two tension is equal

If tension on the first entrance of the comparator exceeds tension on the second entrance, there is a reduction of coefficient of strengthening of the operated amplifier twice After that process repeats until tension on the first entrance of the comparator does not become less, than on the second.

The most important indicator of quality of any measuring device is its accuracy. Therefore when developing the measuring instrument of the relation of tension it is necessary to estimate a measurement error. It is obvious that the error of measurement of the relation of two tension will be defined first of all by an error of measurement of tension. So absolute error of measurement of the relation can be found on a formula

If tension on the first entrance of the comparator is less than tension on the second entrance, the DD1 controler on the second category gives tension + 5B, and on the first category – zero tension. Thus on the second entrance of the comparator the low level of tension (1 volt) which is compared to tension on the first entrance is formed. If after that tension on the first entrance of the comparator is less than tension on the second entrance, there is an increase in coefficient of strengthening of the operated amplifier twice and process repeats until tension on the first entrance of the comparator does not become less, than on the second.