十進抵抗による数字式自動平衡ブリツジ
1955 年 24 巻 6 号 p. 240-243
詳細
1955 年 24 巻 6 号 p. 240-243
An apparatus is described that indicates the resistance of any magnitude from 1 to 106 ohms with maximum accuracy of four figures. The apparatus is essentially a direct current Wheatstone bridge with a variable arm of decade resistance which can be switched by tele-phone selector switches. The unbalance voltage of the bridge is amplified and fed to two thy-ratrons, which energize the stepping magnets of the switches and change the resistance in, either direction to minimize the unbalance. Balancing of the bridge from reset state takes :about 1.5 sec. The apparatus is designed to restore balance automatically as soon as it is destroyed due to change of the resistance. The apparatus may be used-as an analog-to-digital, converter.
