To keep the frequency constant, the speed of the electric motor turning it was controlled with a feedback loop.
2.
In this way, any clock operated by such a motor would run with great precision as long as the operators of the power grid kept the current's frequency constant.
3.
In order to provide deuterium lock, the NMR constantly monitors the deuterium signal resonance frequency from the solvent and makes changes to the B _ 0 to keep the resonance frequency constant.
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