Patent ID: 8628720
Filing Date: 2014-01-14
Classification: G01N

Abstract:
1. An automatic analyzer comprising: a photomultiplier tube as a detector; a high-voltage generator for generating an applied voltage for driving the photomultiplier tube; a control circuit for controlling output of the high-voltage generator; a logarithmic converter for converting the applied voltage to the photomultiplier tube and a measured value of the photomultiplier tube; an arithmetic unit for determining, from an execution result on the logarithmic conversion of the applied voltage and the measured value, a desired voltage for obtaining a desired sensitivity of the photomultiplier tube, wherein the arithmetic unit includes: a calculator for calculating a rate of change of the measured value to each of the applied voltages as a gain; a comparison means for comparing threshold levels with the gain calculated by the calculator; and warning means for displaying a warning if the gain is determined to lie outside a range of the threshold levels by the comparing means.