Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Patent
1997-11-17
2000-08-22
Karlsen, Ernest
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
324686, 422100, G01R 2726
Patent
active
061078107
ABSTRACT:
A liquid level detecting circuit is pattern-printed on a board. The liquid level detecting circuit has a pair of discharge elements and an electrostatic capacitance change detecting circuit. One of the discharge elements is grounded, and the other of the discharge elements is connected to a pipetting probe and the electrostatic capacitance change detecting circuit. When an extraneous noise signal such as a noise signal caused by static electricity charged on the surface of a container is input through the pipetting probe while the pipetting probe is being moved toward the container containing a liquid the liquid surface of which is to be detected, the extraneous noise signal is discharged to the ground through the pair of discharge elements to suppress the transmission of the noise signal to be transmitted to the electrostatic capacitance change detecting circuit. An inductance placed between the other discharge element and the electrostatic capacitance change detecting circuit promotes the discharge of the noise signal.
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Ishizawa Masato
Suzuki Nobuo
Deb Anjan K.
Hitachi , Ltd.
Karlsen Ernest
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