pF-μH計に就て

概要

論文の詳細を見る
It is very difficult to measure the capacity less than 1000 pF and the inductance less than 100 μH by the A. C. bridge. I designed the five range pF-μH meter, whose range are following: 0-0.1μF, 0--1000pF, 0--100pF, 0--100pF, 0--3.5mH and 0--130μH. The ranges are easily changed by a rotary switch. The principle is the utilization of the triode oscillator which has the crystal resonator between the anode and the cathode. The relation between the current through the crystal and the position of the variable condenser is measured. The relation does not show the ordinary resonance cuve but takes a special form, which is very suitable for the present purpose, The effects of the temperature change and the voltage fluctuation of the A. C. source were measured, proving they are very small. The difficulties which we meet in the measurement of the small capacity and inductance will thus be overcome with this pF-μH meter.
富山大学の論文