| 摘要 |
A circuit including a semiconductor logarithmic transfer element is connected to an operational amplifier through a resistor having a resistance proportional to its absolute temperature. A comparison voltage dependent upon the transfer element is also applied to the amplifier through another resistor similar in temperature dependency to the first resistor to be substracted from the output from the circuit. The resulting difference is completely temperature compensated and indicated on an indicator having an indication span controlled by a variable resistor connected across the amplifier and a zero point adjusted by a bias to the amplifier.
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