Abstract: An electronic equipment manufacturer has been bearing the burden to adjust variations in characteristics of semiconductor integrated circuits according to a conventional art. The device and the method of this invention include a microcomputer, signal processing circuit which processes an input signal accordingly to a control signal from the microcomputer and provides an output signal and a memory which stores adjustment values to adjust changes in signal characteristics due to variations in manufacturing of elements composing the signal processing unit. The microcomputer adjusts the changes in the signal characteristics of the signal processing circuit according to the adjustment values stored in the memory.

Abstract: A method for assaying an enzyme on a targeted solid body surface, including the steps of contacting an end opening of a thin tube with a targeted solid body surface to form a space between the targeted solid body surface and inner wall surface of the thin tube, supplying a substrate solution into the space to bring the substrate solution in contact with the targeted solid body surface, and determining a pH change of the substrate solution in the space by using a pH electrode; and an apparatus therefor.