| 摘要 |
PURPOSE:To simplify the circuit constitution, by constituting the amplifier with a reference current source, operational amplifier, current to current converter and current to voltage converter. CONSTITUTION:When the reference current IB from the reference current source B and the current IIR from the external sensor are given to a current to current converter C via an operational amplifier A, the converter C outputs two currents IL and I which change correspondingly. This output I is the difference between the currents IIN and IB and fed to a current voltage converter D. The current I and IL change with corresponding value mutually, and when the current IIN is corresponded to the measuring temperature and the current IB is corresponded to the reference contact temperature, the output in response to the types of thermocouples used can be produced with the converter D, and this circuit can be used as the reference contact compensator. |
