JPS6222540U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of the baseline stabilization circuit in the particle measuring device in liquid according to the present invention, Fig. 2 is a waveform of each part thereof, Fig. 3 is a circuit diagram showing an embodiment of the present invention, and Fig. 4 is A conventional particle counting device is shown.

Claims (1)

[Scope of utility model registration request] Particle measurement in a liquid in which a coupling capacitor is connected to a particle detection circuit that detects the passage of particles through pores in the liquid as an electrical signal, and the waveform of the pulse signal passing through the capacitor is measured or counted. In the apparatus, a DC regenerator that clamps the detection signal of the particle detection circuit to a predetermined DC level;
a voltage comparator that compares the clamp output of the regenerator with a reference level slightly greater than the DC level and converts the clamp output that exceeds the reference level into a gate pulse; and a voltage comparator that delays the trailing edge of the gate pulse. A pulse width expansion circuit, a delay circuit inserted between the particle detection circuit and the coupling capacitor, and a normally on state connected between the output terminal of the coupling capacitor and a reference potential, and a gate pulse is output from the pulse width expansion circuit. A particle measuring device characterized by comprising: a switch that turns off while being supplied.