| 摘要 |
PURPOSE:To transmit accurately a capacitor charging voltage to a digital converter by retarding a timing in which the charging voltage of a flying capacitor is fed to the digital converter slower than a timing selecting a channel. CONSTITUTION:An output minute voltage of thermocouples TC1, TC2 charges up the flying capacitors C1, C2 of filters F1, F2 through cables K1, K2 and channel CH selection relay contacts Rya1, Ryb1, Rya2, and Ryb2 respectively. Then a CH selection relay is changed over, the charging voltage of the C1, C2 is amplified (A) respectively through charged-over contacts Rya1-Ryb2 and group selection relay contacts La, La and fed to the digital converter 10. A relay drive circuit 20 energizes a CH selection relay through the relay contacts Rya1-Ryb2 and La and the relay energizes a group selection relay after a prescribed time is elapsed. Even if the electric charge of the capacitor is separated, the charging voltage corresponding to a voltage generated in the thermocouple is fed to the converter 10. |
