Schaltung zur Impedanzmessung

Details

Veröffentlichungs-Nr.

EP4177618

Aktenzeichen

EP21206525

Anmeldetag

4. November 2021

Veröffentlichung

1. Januar 2025

Erteilung

1. Januar 2025

Rechtsraum

EP

IPC

G01R27/14G01R27/16G01R27/22G01R27/08G01R1/20G01R15/00G01N27/02

Abstract

The front-end circuit (1) for an impedance measurement comprises an excitation-terminal (12), intended to receive an excitation signal relative to a common ground (11), a first and a second input-terminal (13a,b), intended to be connected to two electrodes (3a,b), a first and a second output-terminal (14a,b), whereby each one of the two output-terminals (14a,b) is intended to provide a measurement signal during a use of the front-end circuit (1) in a measurement, preferably to an analogue to digital converter device (4); a first and a second mode selection-switch-unit (15a,b), each with two mode switch-inputs, an operational amplifier (16) and a reference resistor (17). During a measurement and depending on the state of the mode selection-switch-units (15a,b), a feedback-loop of the operational amplifier (16) comprises either a sample (130) arranged between the two input-terminals (13a,b) or the reference resistor (17).

Anmelder

Firma

Mettler-Toledo GmbH

Land

🇨🇭 Schweiz

Fachgebiete