| 摘要 |
In an electrochemical measuring electrode device (10) comprising sensor means (12, 13 and 36) for generation of one or more measuring signals, the measuring signals are multiplexed in a first multiplexing means included in an integrated electronic circuit (23) and transmitted therefrom through a two conductor cable (37) to a cooperating measuring apparatus (50). In the measuring apparatus (50), the measuring signals are demultiplexed and displayed on a display (48). The circuit (23) is mounted on an insulating ceramic substrate (21) also supporting a temperature dependent NTC resistor (28) and a Zener diode (30) together constituting a thermostating means of the electrode device. The electronic circuit of the electrode device (10) and the heat generating Zener diode (30) are supplied with power from the measuring apparatus (50). The transmission is preferably carried out in time-division multiplexed state, so that the measuring results generated by means of the sensor means and the temperature representative signal generated by the NTC resistor (28) are transmitted within individual time intervals, while an electrical power signal for supply of the electronic circuitry of the electrode device and for supply of the Zener diode (30) is transmitted within a specific sub-period of each of the transmission time intervals. The gated amplifier comprises a high-gain differential DC-amplifier a storage capacitor and a switch means for conversion of the gated amplifier to a mode in which any input offset of the DC-amplifier is transmitted in a unity gain mode. |
