On the ground results derived from an analysis of metrological characteristics of the biochemical automatic unit systems and of their influence on the end-result with due regard for actual operating conditions a formula for the automatic unit error was deduced. The specificity of technical requirements to be met by automatic meters is shown and a new complex set of metrological characteristics of the concentration meter are given. At the same time permissible values for metrological characteristics of the meter satisfying medical requirements are defined. The new complex set of metrological characteristics for the biochemical automatic unit concentration meter allows it to make a change from the absolute photometric scale of the device to the one in relative units.
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