Abstract: A particle group characteristic measurement device includes an image acquisition portion that acquires images of a particle group, a particle information extraction portion that processes acquisition images acquired by the image acquisition portion, and then extracts particle information which is information about particles appearing in the acquisition images, and a particle group characteristic calculation portion that calculates a particle group characteristic at a plurality of time points in a time series based on the particle information extracted from a plurality of the acquisition images acquired prior to respective time points.

Abstract: A complex particle measurement apparatus comprising a first light source that irradiates a first storage cell; a photodetector that detects intensity of light; a second light source that irradiates a second storage cell; an imaging unit that images a particle group; an image data output unit that outputs image data; a supporter that supports the first storage cell and the second storage cell; and a communication pipe that connects the first storage cell and the second storage cell to pass a sample solution, wherein the first storage cell and the second storage cell have bottom surfaces located at positions different from each other, and the communication pipe is laid such that a channel from the first storage cell to the second storage cell has an incline of not less than 0 or not more than 0.

Abstract: An A/D converter includes: an A/D converter circuit that causes a dissipation current (Idis) having dependence on an input voltage (Vin); and a counteracting current generation circuit controlled based on an output digital value (Dout) provided from the A/D converter circuit to generate a counteracting current (Icnt) that is a dissipation current for reducing the dependence of the dissipation current (Idis) on the input voltage.

Abstract: An A/D converter includes: an A/D converter circuit that causes a dissipation current (Idis) having dependence on an input voltage (Vin); and a counteracting current generation circuit controlled based on an output digital value (Dout) provided from the A/D converter circuit to generate a counteracting current (Icnt) that is a dissipation current for reducing the dependence of the dissipation current (Idis) on the input voltage.