Qmeter - Q meter

Japanese: Qメーター - キューメーター(英語表記)Q meter
Qmeter - Q meter
This is a measuring instrument that measures the quality factor Q of a coil at high frequencies. If the resistance of the coil is R , the frequency is f , and the inductance is L , then Q can be expressed as Q = 2π fL / R. Using the circuit in the figure, connect the coil to be measured ( R , L ) to the 1-1' terminals. A constant voltage is supplied to the low resistance R0 using an oscillator (OSC) and a thermoelectric ammeter (M). If the capacitance C of the capacitor is changed, resonance will occur when (2π f ) 2 Lc = 1, and the current flowing through the coil will be at its maximum, and at the same time the terminal voltage of C will be at its maximum .

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
高周波におけるコイルの品質係数Qを測定する測定器をいう。コイルの抵抗をR,周波数をf,インダクタンスをLとすると,Q=2πfL/Rで表すことができる。図の回路を用い,1‐1′端子に測定しようとするコイル(R,L)を接続する。発振器(OSC)と熱電形電流計(M)を用いて一定電圧を低抵抗R0に供給する。コンデンサーの静電容量Cを変化させれば(2πf)2Lc=1のときに共振しコイルを流れる電流が最大,同時にCの端子電圧が最大となる。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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