Abstract: Prior to dispensing a sample into a reaction vessel 1 and performing sample measurement, an automatic analyzer dispenses pure water into the reaction vessel to perform water blank measurement, corrects absorbance data of a reaction solution of the sample and a reagent measured by sample measurement with water blank absorbance data measured by the water blank measurement, and performs an analytical sequence that analyzes the sample based on the corrected absorbance data, and also determines a water quality abnormality of a reaction tank circulating water 112 based on the water blank absorbance data measured by the water blank measurement. Accordingly, water quality abnormality is detected in a reaction tank circulating water without adding a dedicated mechanism or confirmation operation.

Abstract: An overcurrent protection circuit includes a first mirror transistor configured to be driven by a first drive signal, common to a first output transistor, so as to pass a first mirror current, a second mirror transistor configured to be driven by a second drive signal so as to pass a second mirror current, a resistor configured to be connected between a control terminal of each of the first output transistor and the first mirror transistor and a control terminal of the second mirror transistor, and a current restriction unit configured to control the first drive signal such that a sense current, which is a total of the first mirror current and the second mirror current, is restricted to values equal to or less than a predetermined upper limit value.

Abstract: A drive circuit includes: a current capability switch configured to switch a current capability of driving an output transistor of a switching power supply according to whether a switch current flowing through the output transistor is in a continuous mode or in a discontinuous mode.

Abstract: A drive circuit includes: a current capability switch configured to switch a current capability of driving an output transistor of a switching power supply according to whether a switch current flowing through the output transistor is in a continuous mode or in a discontinuous mode.

Abstract: User information related to a predetermined user, including a user ID, is obtained from a server on a network. Telephone book information, including the user ID and a telephone number of a communication apparatus that the predetermined user uses, is input on an operation unit of the present communication apparatus. The user information and the telephone book information are stored while being associated based on the user ID. The telephone book information associated with the user information based on the user ID is displayed as secondary information of the user information, when the user information of the predetermined user is displayed on a display and when display of further information of the predetermined user is instructed.