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A method for monitoring the field/frequency lock condition of a high resolution NMR spectrometer and suspending signal averaging in the event of loss or degradation of the lock is described. This procedure involves amplification and conditioning of the absorption mode lock signal, followed by analog-to-digital conversion under control of the data acquisition computer, or by a binary comparison of the lock signal amplitude with a chosen threshold value with analog circuitry.
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Benedict W. Bangerter (1975) studied this question.
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