Automatic Bridge Balance for Nuclear Spin Resonance Spectrometer

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Abstract
Troublesome changes of the bridge balance in a twin‐T nuclear resonance bridge have been eliminated by the application of a voltage‐sensitive condenser. A small amplitude, high‐frequency modulation voltage applied to the condenser senses any deviation from balance, and a servo loop provides a dc correction voltage which maintains the bridge balance. No apparent deterioration of the spectrum results from modulation of the bridge.