FIELD: instruments, in particular, devices which calculate square root from difference between constant and variable. SUBSTANCE: function generator outputs function 
, where 
is constant, (Ux/Uon) = Y is variable 1≅Y≅1. Device has reference voltage source 1, voltage scaling circuit 2, adder 3, controlled squarer 4, comparator 5, memory unit 6. EFFECT: increased precision, increased functional capabilities. 1 dwg
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