| 摘要 |
PURPOSE:To display an input electric field over a wide range without being affected with temperature by connecting the series connection of a rectifier element and a resistor to an output stage after an input signal is detected by the rectifier element. CONSTITUTION:When half wave voltage doubling detection is applied to an input signal 3 and a detected output voltage 4 is fed to a level meter or the like, and when a detected voltage at a point 5 reaches a prescribed value or over, a current flows through the D3 and the RV2 and is added to the current of a resistor R1 so as to decrease the rate of rise of the voltage 4. Thus, the indication of the level meter is not overscaled even when the input electric field is strong so as to attain display over a wide range. Since the current after detection is bypassed at the point 5 by the D3 and the RV2, the increased current by diodes D1, D2 for detection flows in the form of a current Ii in the D3 even with temperature rise and then it is compensated.
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